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Wang Z, Li M, Ji H, Chen H, Sang A, Cheng X, Li J, Yu Y. Comparison of risk factors for OBL in FS-LASIK and SMILE correction for myopia and myopia astigmatism. Graefes Arch Clin Exp Ophthalmol 2024; 262:1925-1931. [PMID: 38091059 DOI: 10.1007/s00417-023-06336-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/26/2023] [Accepted: 11/30/2023] [Indexed: 05/22/2024] Open
Abstract
BACKGROUND To find out the incidence and risk factors of opaque bubble layer (OBL) in eyes with myopia and myopic astigmatism following femtosecond laser-assisted in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE). METHODS A total of 1076 eyes from 569 patients who had FS-LASIK or SMILE were included in the retrospective research. For each kind of surgery, eyes were separated into two groups: "OBL" groups and "no OBL" groups. In the FS-LASIK group, eyes that developed OBL were split into "hard OBL" and "soft OBL" groups. The incidence and size of OBL were analyzed after watching the surgical procedure videotaped during the operation and taking screenshots. Surgical parameters, including sphere, cylinder, keratometry, corneal thickness, flap thickness, cap thickness, lenticule thickness, and visual acuity, were compared. RESULTS In the FS-LASIK surgery, the incidence of OBL was 63.2% (347 eyes). A thicker central corneal thickness (CCT) was the only independent risk factor affecting the OBL area (β = 0.126, P = 0.019). One hundred and thirty of these eyes had hard OBL, and the flap thickness of these eyes was thinner than that of those with soft OBL (P = 0.027). In the SMILE group, 26.6% (140 eyes) developed OBL. A higher flat keratometry (K) and a thicker residual stromal thickness (RST) were risk factors affecting the OBL area (β = 0.195, P = 0.024; β = 0.281, P = 0.001). CONCLUSION The incidence of OBL differs between the FS-LASIK surgery and the SMILE surgery. There are differences in the factors influencing OBL between the two surgeries.
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Affiliation(s)
- Zichen Wang
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Mingrui Li
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Haixia Ji
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Hui Chen
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Aimin Sang
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Xinliang Cheng
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China
| | - Jun Li
- Department of Dermatology, Nantong First People's Hospital, Second Affiliated Hospital of Nantong University, Nantong, 226001, China
| | - Ying Yu
- Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, No. 20, Xisi Road, Nantong City, 226001, Jiangsu Province, China.
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Diaz-Valle D, Burgos-Blasco B, Ariño-Gutierrez M, Gegundez-Fernandez JA. Predescemetic femtosecond laser-assisted deep anterior lamellar keratoplasty with simulated pachymetry. Graefes Arch Clin Exp Ophthalmol 2024; 262:1653-1655. [PMID: 38217768 DOI: 10.1007/s00417-024-06370-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 12/27/2023] [Accepted: 01/03/2024] [Indexed: 01/15/2024] Open
Affiliation(s)
- David Diaz-Valle
- Servicio de Oftalmología, Instituto de Investigación Sanitaria, Hospital Clínico San Carlos (IdISSC), Hospital Clinico San Carlos, Madrid, Spain
- Departamento de Inmunología, Oftalmología y ORL, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
| | - Barbara Burgos-Blasco
- Servicio de Oftalmología, Instituto de Investigación Sanitaria, Hospital Clínico San Carlos (IdISSC), Hospital Clinico San Carlos, Madrid, Spain.
| | - Mayte Ariño-Gutierrez
- Servicio de Oftalmología, Instituto de Investigación Sanitaria, Hospital Clínico San Carlos (IdISSC), Hospital Clinico San Carlos, Madrid, Spain
| | - Jose Antonio Gegundez-Fernandez
- Servicio de Oftalmología, Instituto de Investigación Sanitaria, Hospital Clínico San Carlos (IdISSC), Hospital Clinico San Carlos, Madrid, Spain
- Departamento de Inmunología, Oftalmología y ORL, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
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Qu H, Abulimiti A, Liang J, Zhou S, Wu Z, Chen Y, Ju R, Wang Z, Xu R, Chen X. Comparison of short-term clinical outcomes of a diffractive trifocal intraocular lens with phacoemulsification and femtosecond laser assisted cataract surgery. BMC Ophthalmol 2024; 24:189. [PMID: 38658894 PMCID: PMC11040763 DOI: 10.1186/s12886-024-03440-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 04/09/2024] [Indexed: 04/26/2024] Open
Abstract
PURPOSE To evaluate short-term visual and refractive outcomes after implantation of a diffractive trifocal intraocular lens (IOL) in cataract patients with phacoemulsification (PHACO) and femtosecond laser assisted cataract surgery (FLACS). SETTING Department of Ophthalmology, Shanghai Aier Eye Hospital, China. DESIGN A retrospective, observational study. METHODS Patients who underwent cataract surgery combined with Acrysoft IQ PanOptix trifocal IOL implantation were enrolled and divided into three groups: PHACO group, LAstig-FLACS group (astigmatism less then 1D) and HAstig-FLACS group (astigmatism more than 1D). Logarithm of the minimum angle of resolution (logMAR) visual acuity of uncorrected distance (UDVA), intermediate (UIVA), near visual (UNVA), defocus curve, surgically induced astigmatism (SIA) were evaluated in 1 months postoperatively and wavefront aberrations were evaluated in 6 months. RESULTS 101 eyes of 60 patients were included with 31 eyes in PHACO group, 45 eyes in LAstig-FLACS group and 25 eyes in HAstig-FLACS group. Significant difference was found of internal Strehl Ratio (SR) between PHACO and LAstig-FLACS group (P = 0.026). In PHACO group, 79.31%, 86.21%, 72.41% of eyes gain visual acuity LogMAR 0.1 or more in UDVA, UIVA and UNVA, while 83.72%, 93.02%, 93.02% of those in LAstig-FLACS group and 92.00%, 84.00%, 76.00% in HAstig-FLACS group. CONCLUSIONS Panoptix diffractive trifocal IOL provides satisfied visual outcome in no matter FLACS or PHACO. Besides, trifocal IOL implantation via FLACS can provide a better accumulative visual acuity outcome at all distance than PHACO in 1 month. Femtosecond laser assisted limbal relaxing incisions (FLLRIs) is an excellent way to reduce a patient's corneal astigmatism.
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Affiliation(s)
- Haokun Qu
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
- Jinan University, No.601, Huangpu Road West, Guangzhou, China
| | - Adilamu Abulimiti
- Department of Ophthalmology, Shanghai Aier Eye Hospital, Shanghai, China
| | - Jianheng Liang
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
| | - Suowang Zhou
- Jinan University, No.601, Huangpu Road West, Guangzhou, China
| | - Zheming Wu
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
| | - Yun Chen
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
| | - Ruihong Ju
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
| | - Zheng Wang
- Aier Eye Hospital, Jinan University, No. 191, Huanshi Middle Road, Yuexiu District, Guangzhou, Guangdong, China
- Jinan University, No.601, Huangpu Road West, Guangzhou, China
| | - Rong Xu
- Hankou Aier Eye Hospital, Wuhan, China
| | - Xu Chen
- Jinan University, No.601, Huangpu Road West, Guangzhou, China.
- Department of Ophthalmology, Shanghai Aier Eye Hospital, Shanghai, China.
- Department of Ophthalmology, Shanghai Aier Qingliang Eye Hospital, Qingpu, Shanghai, China.
- Department of Ophthalmology & Optometry, SinoUnited Health Clinic, Shanghai, China.
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Liao XS, Jin HY, Zhu LP, Luo WJ, Wang Y, Hu SQ. Application of Femtosecond Laser + Piggyback Multifocal Intraocular Lens Implantation in Patients with Super-High Myopia Complicated with Cataract. Semin Ophthalmol 2024; 39:217-222. [PMID: 37997000 DOI: 10.1080/08820538.2023.2275618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 10/19/2023] [Indexed: 11/25/2023]
Abstract
OBJECTIVE To observe the clinical effect of piggyback multifocal intraocular lens (IOL) implantation in treating patients with high myopia complicated with cataract. METHODS This was a prospective controlled study. We compared 32 eyes of 32 patients who underwent femtosecond laser-assisted cataract surgery with piggyback IOL implantation (two IOLs were implanted into the capsule) with 32 eyes of 32 patients who also underwent the same surgery (one IOL implanted into the capsule) due to high myopia complicated with cataract at the Wuhan Aier Eye Expert Hospital between January 2019 and October 2020. All patients were followed up for three months after surgery. Uncorrected distance visual acuity (UCDVA), uncorrected intermediate visual acuity (UCIVA), uncorrected near visual acuity (UCNVA), best-corrected distance visual acuity, distance-corrected intermediate visual acuity (DCIVA), distance-corrected near visual acuity (DCNVA), postoperative spectacle independence, postoperative visual interference, equivalent spherical lens, defocus curve, and IOL tilt and eccentricity were evaluated. RESULTS Three months after surgery, the patients' UCIVA, UCNVA, DCIVA, and DCNVA were 0.49 ± 0.07, 0.38 ± 0.15, 0.47 ± 0.09, and 0.36 ± 0.12, respectively, in the research group and 0.56 ± 0.18, 0.72 ± 0.22, 0.55 ± 0.13, and 0.69 ± 0.15, respectively, in the control group; the differences between the two groups were statistically significant (P < .05). The spectacle independence rate was higher in the research group (93%) than in the control group (13%). The overall satisfaction regarding postoperative visual quality was also higher in the research group than in the control group. The absolute mean value of the spherical equivalents was 0.48 ± 0.28 D in the research group and 0.62 ± 0.33 D in the control group; the difference between the two groups was statistically significant (P < .05). CONCLUSION Piggyback multifocal IOL implantation can expand the multifocal IOL application range, and satisfy the desire of patients with high myopia complicated with cataract to see both near and far.
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Affiliation(s)
- Xian-Shan Liao
- Health Science Center, Yangtze University, Jingzhou, China
| | - Hui-Yu Jin
- Department of Ophthalmology, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li-Ping Zhu
- Department of Orthopedics, The First Affiliated Hospital of Yangtze University, Jingzhou, China
| | - Wen-Jing Luo
- Department of Cataract, Aier Eye Hospital of Wuhan University, Wuhan, China
| | - Yong Wang
- Department of Cataract, Aier Eye Hospital of Wuhan University, Wuhan, China
| | - Shu-Qiong Hu
- Department of Cataract, Aier Eye Hospital of Wuhan University, Wuhan, China
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Abdelrahman O, Topka M, Zhang Y, Bock A, Lörner J, Jungbauer R, Hotfiel T, Paulsen F, Hammer CM. Suitability of Slaughterhouse-Acquired Pig Eyes as Model Systems for Refractive Ultraviolet and Infrared Femtosecond Laser Research. Curr Eye Res 2024; 49:401-409. [PMID: 38146603 DOI: 10.1080/02713683.2023.2297348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 12/16/2023] [Indexed: 12/27/2023]
Abstract
PURPOSE To elucidate whether it is feasible to use porcine eyes from scalded, abattoir-acquired animals for refractive femtosecond laser research. METHODS An infrared laser (FS 200) and an ultraviolet laser (prototype version) were tested for their applicability on scalded pig eyes. Fifty porcine eyes were divided into two equally-sized groups and assigned to either the infrared or the ultraviolet laser. Both laser groups were comprised of five subgroups of n = 5 eyes each. Group A: non-scalded eyes (negative control); group B: eyes taken from tunnel-scalded animals; group C1: eyes taken from tank-scalded animals without opaque corneal lesion; group C2: eyes taken from animals with opaque corneal lesion; group D: eyes scalded in toto in the laboratory (positive control). In each group the lasers were employed to create a stromal flap. The quality of the laser cuts and the resulting flap beds, as well as of the porcine corneas themselves, was examined by anterior segment optical coherence tomography and scanning electron microscopy. RESULTS All scalded specimens exhibited substantial corneal swelling, most pronounced in group C2. After ultraviolet laser application, the tank- and tunnel-scalded samples displayed marked irregularities and an increased degree of surface roughness in the flap beds. After infrared laser application, this was only the case in the tank-scalded specimens. CONCLUSION It is not recommended to use eyes taken from scalded pigs for ultraviolet femtosecond laser experiments. For infrared femtosecond lasers, eyes taken from tunnel-scalded animals may represent an acceptable alternative, if non-scalded eyes are not available.
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Affiliation(s)
- Omar Abdelrahman
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Marius Topka
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Yao Zhang
- WaveLight GmbH, Erlangen, Bavaria, Germany
| | | | | | - Rebecca Jungbauer
- Department of Orthodontics, University Medical Centre Regensburg, Regensburg, Germany
| | - Thilo Hotfiel
- Center for Musculoskeletal Surgery Osnabrück, Klinikum Osnabrück, Osnabrück, Germany
- Department of Orthopedic and Trauma Surgery, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Friedrich Paulsen
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian M Hammer
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Anatomy Unit, Section of Medicine, Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
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Gholinia A, Donoghue J, Garner A, Curd M, Lawson MJ, Winiarski B, Geurts R, Withers PJ, Burnett TL. Exploration of fs-laser ablation parameter space for 2D/3D imaging of soft and hard materials by tri-beam microscopy. Ultramicroscopy 2024; 257:113903. [PMID: 38101083 DOI: 10.1016/j.ultramic.2023.113903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 11/07/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Tri-beam microscopes comprising a fs-laser beam, a Xe+ plasma focused ion beam (PFIB) and an electron beam all in one chamber open up exciting opportunities for site-specific correlative microscopy. They offer the possibility of rapid ablation and material removal by fs-laser, subsequent polishing by Xe-PFIB milling and electron imaging of the same area. While tri-beam systems are capable of probing large (mm) volumes providing high resolution microscopical characterisation of 2D and 3D images across exceptionally wide range of materials and biomaterials applications, presenting high quality/low damage surfaces to the electron beam can present a significant challenge, especially given the large parameter space for optimisation. Here the optimal conditions and artefacts associated with large scale volume milling, mini test piece manufacture, serial sectioning and surface polishing are investigated, both in terms of surface roughness and surface quality for metallic, ceramic, mixed complex phase, carbonaceous, and biological materials. This provides a good starting place for those wishing to examine large areas or volumes by tri-beam microscopy across a range of materials.
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Affiliation(s)
- A Gholinia
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK.
| | - J Donoghue
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
| | - A Garner
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
| | - M Curd
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
| | - M J Lawson
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
| | - B Winiarski
- Thermo Fisher Scientific, Pecha 1282/12, Brno 62700, Czech Republic
| | - R Geurts
- Thermo Fisher Scientific, Achtseweg Noord 5, Eindhoven 5651GG, The Netherlands
| | - P J Withers
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
| | - T L Burnett
- Department of Materials, Henry Royce Institute, The University of Manchester, M13 9PL, UK
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Sun X, Shen D, Jiang H, Wang Y, Wang R, Wei W. Clinical outcomes of stromal lenticule rotation to correct mixed astigmatism. Eur J Ophthalmol 2024; 34:574-582. [PMID: 38099818 DOI: 10.1177/11206721231221165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
PURPOSE To describe a stromal lenticule rotation surgical technique to correct mixed astigmatism and evaluate the initial clinical outcomes of this innovative approach. METHODS This retrospective case series included five eyes from five patients with mixed astigmatism that underwent intrastromal lenticule rotation surgery. The eyes were evaluated for uncorrected visual acuity, corrected distance visual acuity, manifest refraction, central corneal thickness, corneal volume, anterior and posterior K readings, and corneal higher order aberrations (HOAs) (including total HOAs, spherical aberrations, coma, and trefoil) using the Scheimpflug-Placido topographer before and 3 months after surgery. The corneal epithelium and stroma were imaged using anterior segment optical coherence tomography (AS-OCT) postoperatively. A paired-sample t-test was used to analyse the data. RESULTS Clinical improvement was found in the uncorrected distance visual acuity (0.64 ± 0.11 logMAR vs. 0.20 ± 0.17 logMAR) and spherical and cylindrical diopters (D) (+2.65 ± 1.32 D vs. -0.05 ± 0.51 D and -4.95 ± 0.94 D vs. -1.10 ± 0.78 D, respectively). Anterior flat keratometry readings showed a steep trend (40.65 ± 1.24 D vs. 42.73 ± 0.63 D). Anterior corneal astigmatism decreased from 4.50 ± 0.55 D to 2.05 ± 0.73 D. According to the AS-OCT images, no significant epithelial remodelling was observed postoperatively. Although no significant differences were found among the increased corneal HOAs, the coma and trefoil changed much more than spherical aberrations 3 months postoperatively. CONCLUSIONS The results for these five eyes suggest that the autologous stromal lenticule rotation technique is safe and effective; it may be an economical and feasible surgical option for correcting mixed astigmatism.
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Affiliation(s)
- Xiyu Sun
- Department of Ophthalmology, The First Affiliated Hospital of Northwest University, Xi'an, Shaanxi, China
- Laser Vision Center, Xi'an No. 1 Hospital, Xi'an, Shaanxi, China
- Shaanxi Institute of Ophthalmology, Xi'an, Shaanxi, China
| | - Di Shen
- Department of Ophthalmology, The First Affiliated Hospital of Northwest University, Xi'an, Shaanxi, China
- Laser Vision Center, Xi'an No. 1 Hospital, Xi'an, Shaanxi, China
- Shaanxi Institute of Ophthalmology, Xi'an, Shaanxi, China
| | | | - Yani Wang
- Department of Ophthalmology, The First Affiliated Hospital of Northwest University, Xi'an, Shaanxi, China
- Laser Vision Center, Xi'an No. 1 Hospital, Xi'an, Shaanxi, China
- Shaanxi Institute of Ophthalmology, Xi'an, Shaanxi, China
| | - Rui Wang
- Department of Ophthalmology, The First Affiliated Hospital of Northwest University, Xi'an, Shaanxi, China
- Laser Vision Center, Xi'an No. 1 Hospital, Xi'an, Shaanxi, China
- Shaanxi Institute of Ophthalmology, Xi'an, Shaanxi, China
| | - Wei Wei
- Department of Ophthalmology, The First Affiliated Hospital of Northwest University, Xi'an, Shaanxi, China
- Laser Vision Center, Xi'an No. 1 Hospital, Xi'an, Shaanxi, China
- Shaanxi Institute of Ophthalmology, Xi'an, Shaanxi, China
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Mäkinen P, Nättinen J, Aapola U, Pietilä J, Uusitalo H. Comparison of early changes in tear film protein profiles after small incision lenticule extraction (SMILE) and femtosecond LASIK (FS-LASIK) surgery. Clin Proteomics 2024; 21:11. [PMID: 38368345 PMCID: PMC10874072 DOI: 10.1186/s12014-024-09460-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 02/06/2024] [Indexed: 02/19/2024] Open
Abstract
BACKGROUND Small incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (LASIK) are widely used surgical methods to correct myopia with comparable efficacy, predictability, and safety. We examined and compared the early changes of tear protein profiles after SMILE and FS-LASIK surgery in order to find possible differences in the initial corneal healing process. METHODS SMILE operations for 26 eyes were made with Visumax femtosecond laser. In FS-LASIK surgery for 30 eyes, the flaps were made with Ziemer FEMTO LDV Z6 femtosecond laser and stromal ablation with Wavelight EX500 excimer laser. Tear samples were collected preoperatively, and 1.5 h and 1 month postoperatively using glass microcapillary tubes. Tear protein identification and quantification were performed with sequential window acquisition of all theoretical fragment ion spectra mass spectrometry (SWATH-MS). RESULTS Immediately (1.5 h) after we found differences in 89 proteins after SMILE and in 123 after FS-LASIK operation compared to preoperative protein levels. Of these differentially expressed proteins, 48 proteins were common for both surgery types. There were, however, quantitative differences between SMILE and FS-LASIK. Upregulated proteins were mostly connected to inflammatory response and migration of the cells connected to immune system. One month after the operation protein expressions levels were returned to baseline levels with both surgical methods. CONCLUSIONS Our study showed that immediate changes in protein profiles after SMILE and FS-LASIK surgeries and differences between the methods are connected to inflammatory process, and the protein levels quickly return to the baseline within 1 month. The differences in protein profiles between the methods are probably associated with the different size of the epithelial wound induced.
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Affiliation(s)
- Petri Mäkinen
- SILK, Eye and Vision Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.
- Silmäasema Eye Hospital, Hämeenkatu 6, Tampere, 33100, Finland.
| | - Janika Nättinen
- SILK, Eye and Vision Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Ulla Aapola
- SILK, Eye and Vision Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Juhani Pietilä
- SILK, Eye and Vision Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Silmäasema Eye Hospital, Hämeenkatu 6, Tampere, 33100, Finland
| | - Hannu Uusitalo
- SILK, Eye and Vision Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- TAUH Eye Center, Tampere University Hospital, Tampere, Finland
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Zhang D, Chen T, Shen T, Zhang Y, He Y, Si J, Hou X. Sub-diffraction limited nanogroove fabrication of 30 nm features on diamond films using 800 nm femtosecond laser irradiation. Heliyon 2024; 10:e24240. [PMID: 38304800 PMCID: PMC10831597 DOI: 10.1016/j.heliyon.2024.e24240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 11/28/2023] [Accepted: 01/04/2024] [Indexed: 02/03/2024] Open
Abstract
By controlling the 800 nm fs laser energy and applying an isopropyl alcohol environment, controlled sub-diffraction limited lithography with a characteristic structure of approximately 30 nm was achieved on the surface of diamond films, and diamond gratings with a period of 200 nm were fabricated. The fabrication of single grooves with a feature size of 30 nm demonstrates the potential for patterning periodic or nonperiodic structures, and the fabrication of 200 nm periodic grating structures demonstrates the ability of the technique to withstand laser proximity effects. This enhances the technology of diamond film nanofabrication and broadens its potential applications in areas such as optoelectronics and biology.
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Affiliation(s)
- Daqi Zhang
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Tao Chen
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Tianlun Shen
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Yu Zhang
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Yingsong He
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Jinhai Si
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
| | - Xun Hou
- Key Laboratory of Physical Electronics and Devices, Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, 710049, China
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Mahmoud N, Mohamed WR, Mohamed T. Femtosecond laser-induced fluorescence for rapid monitoring of cardiac troponin 1 as a cardiovascular disease biomarker. Spectrochim Acta A Mol Biomol Spectrosc 2024; 305:123491. [PMID: 37837929 DOI: 10.1016/j.saa.2023.123491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 10/02/2023] [Indexed: 10/16/2023]
Abstract
Medical diagnosis usually requires blood analysis of various biomarkers which are essential for disease detection and health status monitoring. Cardiac troponin 1 (cTn1) is a protein member of the cardiac troponin complex used for the diagnosis of several pathologies associated with cardiomyocyte necrosis. Laser-induced fluorescence (LIF) is a technique with high sensitivity and specificity, and it is one of the most significant developments used as an analytical tool for qualitative and quantitative analysis. The current study investigated the potential application of femtosecond LIF as a novel detection technique for rapid monitoring of cTn1 in clinical analysis. In the present study, the cTn1 (8 ng/ml) was excited over wavelengths ranging from 350 to 400 nm, and the LIF spectra were recorded. The results demonstrated that the maximum fluorescence intensity was observed at an excitation wavelength of 350 nm, with an emitted fluorescence peak centeredat 494 nm. At an excitation wavelength of 350 nm, different concentrations of cTn1 have been investigated and LIF spectra were obtained. The results revealed that the fluorescence peak intensity is concentration-dependent and increases linearly with increasing cTn1 concentration. These findings show that femtosecond LIF presents a unique, highly selective, precise, and direct approach to monitoring cTn1.
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Affiliation(s)
- Nora Mahmoud
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Wafaa R Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Faculty of Pharmacy, Department of Pharmacology and Toxicology, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Tarek Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt.
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Cañones-Zafra R, Gros-Otero J, Garcia-Gonzalez M, Casado S, Ketabi S, Villa-Collar C, Teus MA. Atomic force microscopy for the evaluation of corneal surface roughness after femtosecond laser flap creation and excimer ablation. Int Ophthalmol 2023; 43:4131-4136. [PMID: 37505289 DOI: 10.1007/s10792-023-02821-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 07/10/2023] [Indexed: 07/29/2023]
Abstract
INTRODUCTION It is well known that the femtosecond laser lamellar cut induces some degree of surface roughness. Nevertheless, as in femtosecond laser-assisted LASIK (FS-LASIK), an excimer LASIK ablation is performed, and the post-ablation stromal bed should show some degree of smoothening. We decided to compare, using atomic force microscopy (AFM), the roughness of the corneal stromal bed, after a femtosecond lasers device flap was created with or without an excimer myopic ablation. METHODS Using 6 freshly enucleated porcine eyes, we created in every eye a flap using a femtosecond laser. Additionally, in 3 eyes, an excimer laser ablation to correct-3 diopters (D) was made. AFM imaging of the remaining corneal stroma was performed. Ten different square areas of 20 μm x 20 μm at the central area of the stroma of each corneal sample were studied. The roughness parameters used were the root-mean-square deviation from a perfectly flat surface. RESULTS The RMS deviation was 360 ± 120 nm in femtosecond laser only, and 110 ± 20 nm in those cases where excimer is also involved (p < 0.0001). CONCLUSIONS Our results show that the roughness of the surface treated with excimer is clearly lower than in the group with no excimer ablation; thus, the application of laser excimer after a flap created by femtosecond laser seems to soften the nano-irregularities created by this technique.
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Affiliation(s)
- Rafael Cañones-Zafra
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain.
- Clínica Novovisión, Madrid, Spain.
| | | | | | | | - Samira Ketabi
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain
| | - César Villa-Collar
- Clínica Novovisión, Madrid, Spain
- Department of Pharmacy, Biotechnology, Nutrition, Optics and Optometry, Universidad Europea de, Madrid, Spain
| | - Miguel A Teus
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain
- Clínica Novovisión, Madrid, Spain
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Zhou N, Chen X, Yin N. Effect of corneal flap thickness on opaque bubble layer formation in Visumax FS-LASIK using GEE analysis. Heliyon 2023; 9:e21547. [PMID: 37964822 PMCID: PMC10641232 DOI: 10.1016/j.heliyon.2023.e21547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 11/16/2023] Open
Abstract
Introduction This study aimed to investigate two types of corneal flap thickness on opaque bubble layer (OBL) formation in Visumax femtosecond laser-assisted stromal for situ keratomileusis (FS-LASIK). Methods This retrospective study analyzed 203 eyes of 103 patients (32 men and 71 women) who underwent Visumax FS-LASIK between January 2020 and June 2020, and according to corneal flap thickness, they were divided into the 100-μm group (64 eyes) and the 110-μm group (139 eyes). Anterior-segment examination revealed no abnormal findings. Preoperatively, intraocular pressure (IOP), central corneal thickness (CCT), residual stromal thickness (RST), spherical power, cylindrical power, flat keratometry (K1), steep keratometry (K2), and biomechanical parameters including deformation amplitude (DA) ratio, Integrated Radius, stiffness parameter at first applanation (SP-A1), and Ambrosio relational thickness to the horizontal profile (ARTh) were evaluated. Primary outcomes were the incidence of OBL formation in the two groups compared by the Chi-square test and the correlation between the incidence of OBL and the above preoperative data by Spearman's Rho test. Secondary outcomes were the comparisons corrected by the generalized estimating equation (GEE) model. Results The incidence of OBL formation in the 100-μm group was 59.4 %, which was higher than that in the 110-μm group (23.0 %) with a significant difference (χ2 = 25.635, P < 0.001). The thinner corneal flap thickness (r = -0.355, P < 0.001) and higher spherical power (r = -0.142, P < 0.05) correlated with OBL formation. Higher K1 (r = 0.217, P < 0.01) and K2 (r = 0.198, P < 0.01) also correlated with OBL formation. The results of the GEE correction analysis showed higher rates of OBL formation in the 100-μm group (odds ratio [OR] = 4.704, 95 % CI 1.681-13.161, P < 0.01). Conclusions OBL was more likely to occur with the 100-μm corneal flap than with the 110-μm corneal flap in Visumax FS-LASIK. The risk of OBL formation in the 100-μm group was 4.704 times higher than that in the 110-μm group.
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Affiliation(s)
- Na Zhou
- Department of Refractive Surgery, Dongguan Aier Eye Hospital, China
| | - Xiaobei Chen
- Department of Refractive Surgery, Dongguan Aier Eye Hospital, China
| | - Na Yin
- Department of Refractive Surgery, Dongguan Aier Eye Hospital, China
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Wang T, Ren B, Li C, Guo K, Leng J, Zhou P. Monolithic tapered Yb-doped fiber chirped pulse amplifier delivering 126 μJ and 207 MW femtosecond laser with near diffraction-limited beam quality. Front Optoelectron 2023; 16:30. [PMID: 37906421 PMCID: PMC10618150 DOI: 10.1007/s12200-023-00087-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 10/06/2023] [Indexed: 11/02/2023]
Abstract
In this work, a high-energy and high peak power chirped pulse amplification system with near diffraction-limited beam quality based on tapered confined-doped fiber (TCF) is experimentally demonstrated. The TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250 µm at the thin end and 56/400 μm at the thick end. With a backward-pumping configuration, a maximum single pulse energy of 177.9 μJ at a repetition rate of 504 kHz is realized, corresponding to an average power of 89.7 W. Through partially compensating for the accumulated nonlinear phase during the amplification process via adjusting the high order dispersion of the stretching chirped fiber Bragg grating, the duration of the amplified pulse is compressed to 401 fs with a pulse energy of 126.3 μJ and a peak power of 207 MW, which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fiber laser. At the highest energy, the polarization extinction ratio and the M2 factor were respectively measured to be ~ 19 dB and 1.20. In addition, the corresponding intensity noise properties as well as the short- and long-term stability were also examined, verifying a stable operation of the system. It is believed that the demonstrated laser source could find important applications in, for example, advanced manufacturing and photomedicine.
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Affiliation(s)
- Tao Wang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Bo Ren
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Can Li
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
| | - Kun Guo
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Jinyong Leng
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, 410073, China
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, 410073, China
| | - Pu Zhou
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
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Yang S, Dong C, Song C, Liao W, He Z, Jiang S, Sun C, Wang Y, Xiong Y. Femtosecond laser lithotripsy: a novel alternative for kidney stone treatment? Evaluating the safety and effectiveness in an ex vivo study. Urolithiasis 2023; 51:118. [PMID: 37796347 DOI: 10.1007/s00240-023-01493-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 09/19/2023] [Indexed: 10/06/2023]
Abstract
The Holmium (Ho:YAG) laser is presently the most extensively employed in laser lithotripsy for the management of kidney stones. Despite its adoption as the gold standard for laser lithotripsy, Ho:YAG laser lithotripsy poses three significant challenges, namely thermal effect, insufficient stone fragmentation, and stone displacement, which have garnered increased attention from urologic surgeons. Nowadays, the femtosecond laser is regarded as a potential alternative to the Ho:YAG laser due to its capacity to ablate diverse materials with minimal thermal effect. In our ex vivo investigation, we assessed the dimensions of ablation pits, the efficacy of ablation, the degree of stone fragmentation, the alterations in water temperature surrounding stones, and the degree of tissue damage associated with Femtosecond laser lithotripsy utilizing adjustable power settings (1-50 W). Our findings indicate that the ablation pits generated by the Femtosecond laser exhibited uniform geometries, and the effectiveness of ablation and fragmentation for Femtosecond laser lithotripsy were significantly and positively correlated with laser power. When the laser power remained constant, the Femtosecond laser with higher pulse energy demonstrated superior efficiency in stone ablation, but inferior performance in stone fragmentation. Conversely, the Femtosecond laser with higher pulse frequency exhibited the opposite behavior. Furthermore, the thermal effect increased proportionally with laser power, leading to a tentative recommendation of 10W laser power for future investigations. Our in vitro findings suggest that the Femtosecond laser holds promise as a safe and effective alternative to holmium lasers.
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Affiliation(s)
- Sixing Yang
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China.
| | - Caitao Dong
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Chao Song
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Wenbiao Liao
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Ziqi He
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Shengming Jiang
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Chang Sun
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Yunhan Wang
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Yunhe Xiong
- Department of Urology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei Province, People's Republic of China.
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Teshigawara T, Akaishi M, Mizuki Y, Takeuchi M, Hata S, Meguro A, Mizuki N. Modified Technique of Setting Capsulotomy Thickness in Reducing Capsulotomy-Related Complications During Femtosecond Laser-Assisted Cataract Surgery: A Prospective, Comparative Cohort Study. Ophthalmol Ther 2023; 12:2621-2630. [PMID: 37466812 PMCID: PMC10442002 DOI: 10.1007/s40123-023-00770-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 07/04/2023] [Indexed: 07/20/2023] Open
Abstract
INTRODUCTION Although uncommon, incomplete capsulotomy, anterior capsule tags and anterior capsule tears are still encountered during femtosecond laser-assisted cataract surgery (FLACS), resulting in surgical complications. This highlights the need to improve femtosecond laser-assisted capsulotomy technique to reduce capsulotomy-related complications. Therefore, the purpose of this study was to investigate the efficacy of a newly developed, modified technique of setting capsulotomy irradiation thickness in lowering the incidence of capsulotomy-related complications in FLACS. METHODS This open-label prospective, comparative cohort study included 440 eyes (220 patients) treated with FLACS using the LenSx laser system (Alcon Laboratories, Inc. Fort Worth, TX, USA). Varying capsulotomy irradiation thicknesses were applied in each eye of the same patient. In Group 1, capsulotomy irradiation thickness was set between the upper edge of the highest point of the anterior capsule and the lower edge of the lowest point of the anterior capsule (modified technique). In Group 2, this was set between the center of the highest point of the anterior capsule and the center of the lowest part of the anterior capsule (conventional technique). Incidence rates of incomplete capsulotomy, anterior capsule tags and tears, and posterior capsule tears were compared. RESULTS Preoperative baseline characteristics showed no significant differences. Mean total of the irradiation thicknesses was 877.1 ± 81.9 µm in Group 1 and 808.9 ± 80.0 in Group 2, with a statistically significant difference (P < 0.001). Incidences of incomplete capsulotomy were 1.8% and 7.7%, anterior capsule tags were 2.3% and 8.6%, and anterior capsule tears were 0% and 3.2% in Groups 1 and 2, respectively. These differences were statistically significant (P = 0.006, 0.005, and 0.015, respectively). No posterior capsule tears were reported in either group. CONCLUSION The modified technique for capsulotomy in FLACS may significantly reduce the occurrence of capsulotomy-related complications, maximizing the benefits of FLACS.
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Affiliation(s)
- Takeshi Teshigawara
- Department of Ophthalmology, Yokosuka Chuoh Eye Clinic, 2-6 Odaki-cho, Yokosuka, Kanagawa, 238-0008, Japan.
- Department of Ophthalmology, Tsurumi Chuoh Eye Clinic, Tsurumi, Yokohama, Kanagawa, Japan.
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan.
| | - Miki Akaishi
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan
| | - Yuki Mizuki
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan
| | - Masaki Takeuchi
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan
| | - Seiichiro Hata
- Department of Ophthalmology, Yokohama Sky Eye Clinic, Yokohama, Kanagawa, Japan
| | - Akira Meguro
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan
| | - Nobuhisa Mizuki
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa, Yokohama, Kanagawa, Japan
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Piulachs I, Giner-Tarrida L, España-Tost A, Arnabat-Dominguez J, Florian C. In vitro comparative study between adhesion forces obtained on zirconia ceramic micromechanically treated with femtosecond laser (1027 nm), carbon dioxide laser (10,600 nm), and aluminum-oxide particles. Lasers Med Sci 2023; 38:194. [PMID: 37626207 DOI: 10.1007/s10103-023-03859-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 08/16/2023] [Indexed: 08/27/2023]
Abstract
Conventional surface roughening treatments used for silica-based ceramics in order to improve subsequent adhesion become unreliable for zirconia ceramics. Laser conditioning can be a good alternative. The purpose of this in vitro study was to compare conventional (macro) shear bond strength (SBS) values obtained between resin composite and zirconium oxide ceramic samples grouped according to different micromechanical treatments received, and examine differences in surface roughness. One-hundred and fifty disks of sintered zirconia were randomly divided into 5 groups and roughened as follows: (1) Group NOT, no surface treatment; (2) Group APA, abraded with 50-μm aluminum-oxide (Al2O3) particles; (3) Group TBS, abraded with 30-μm aluminum-oxide particles covered with silica; (4) Group CO2, irradiated with a CO2 laser which emitted in continuous wave mode at 3 W of power; and (5) Group FEM, irradiated with a pulsed femtosecond laser, with an incident energy of 10 μJ, a frequency of 1000 Hz, and a fluence of 1.3 kJ/cm2. All surfaces were treated with a MDP-containing adhesive/silane coupling agent mixture upon which were prepared and light polymerized composite resin cylinders. Shear bond strength was measured and samples were observed by scanning electron microscopy (SEM). Statistically significant differences (p < 0.05) were found among all groups, except between CO2 and FEM, which showed the highest adhesion values (15.12 ± 2.35 MPa and 16.03 ± 2.73 MPa). SEM revealed differences in surface patterns. CO2 laser irradiation can be an alternative to sandblasting, although it could also weaken the ceramic. Suitable surface patterns on zirconia ceramics can be obtained with ultrashort pulsed radiation emitted by a pulsed femtosecond laser.
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Affiliation(s)
- Ignasi Piulachs
- Department of Prosthetic Dentistry, Universitat Internacional de Catalunya (UIC), Barcelona, Spain.
| | - Luis Giner-Tarrida
- Department of Prosthetic Dentistry, Universitat Internacional de Catalunya (UIC), Barcelona, Spain
| | - Antoni España-Tost
- Department of Oral Surgery, Universitat de Barcelona (UB), Barcelona, Spain
| | | | - Camilo Florian
- Department of Applied Physics, Universitat de Barcelona (UB), Barcelona, Spain
- Instituto de Óptica Daza de Valdés, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
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Wang S, Shan S, Zhang J, Liu Z, Gu X, Hong Y, He H, Ren T. Airway epithelium regeneration by photoactivated basal cells. J Photochem Photobiol B 2023; 245:112732. [PMID: 37290293 DOI: 10.1016/j.jphotobiol.2023.112732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 04/27/2023] [Accepted: 05/26/2023] [Indexed: 06/10/2023]
Abstract
The airway epithelium is the footstone to maintain the structure and functions of lung, in which resident basal cells (BCs) maintain homeostasis and functional regeneration of epithelial barrier in response to injury. In recent clinical researches, transplanting BCs has shown great inspiring achievements in therapy of various lung diseases. In this study, we report a noninvasive optical method to activate BCs for airway epithelium regeneration in vivo by fast scanning of focused femtosecond laser on BCs of airway epithelium to active Ca2+ signaling and subsequent ERK and Wnt pathways. The photoactivated BCs present high proliferative capacity and maintain high pluripotency, which enables them to plant in the injured airway epithelium and differentiate to club cells for regeneration of epithelium. This optical method can also work in situ to activate localized BCs in airway tissue. Therefore, our results provide a powerful technology for noninvasive BC activation in stem-cell therapy of lung diseases.
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Affiliation(s)
- Shaoyang Wang
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China; School of Biomedical Engineering, Hainan University, 58 Renmin Avenue, 570228, Haikou, China; School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, 200030 Shanghai, China
| | - Shan Shan
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China
| | - Jingyuan Zhang
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China; School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, 200030 Shanghai, China
| | - Zeyu Liu
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China
| | - Xiaohua Gu
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China
| | - Yue Hong
- Stem Cell Center, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China; School of Life Sciences, Hainan University, 58 Renmin Avenue, 570228 Haikou, China.
| | - Hao He
- School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, 200030 Shanghai, China.
| | - Tao Ren
- Department of Respiratory Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, 200233 Shanghai, China; Shanghai Key Laboratory of Sleep Disordered Breathing, 600 Yishan Road, 200233 Shanghai, China.
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Zhai J, Cui J, Zhang J, Hu J, Yu Z. Kinetic simulation study of femtosecond laser processing of graphene oxide: first-principles. J Mol Model 2023; 29:265. [PMID: 37498391 DOI: 10.1007/s00894-023-05671-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/17/2023] [Indexed: 07/28/2023]
Abstract
CONTEXT Organic-inorganic nanoparticles have received extensive attention in various fields due to their unique physicochemical properties and biological activities. Among these nanoparticles, graphene oxide (GO) has emerged as a promising material, and thus, its application in biomedical fields is of great interest. Coating graphene oxide on the surface of implants can enhance its properties such as antibacterial and cell proliferation promotion, but the osteogenic properties of graphene oxide coating need further improvement, and the chance of acute inflammation triggered by local reactive oxygen species accumulation needs to be reduced. High-precision modulation of graphene oxide surface micro/nanomorphology and chemical composition can be achieved using femtosecond laser processing technology to improve its performance while also reducing the oxygen content of the graphene oxide surface to some extent. In this paper, the properties of graphene oxide were investigated by kinetic simulations based on the first-principle. The results show that the band gap of graphene oxide changes from 0.386 to 0.021 eV; the work function changes from 4.882 to 4.64 eV; the size and number of peaks in the radial distribution function decreases; and the intensity of the scatter X-ray peak becomes smaller under the action of femtosecond laser, indicating that the oxygen-containing functional groups on the surface of graphene oxide are disrupted, which provides a basis for its potential application in the medical field. METHODS To investigate the properties of graphene oxide, SEM, XPS, Raman, and FTIR characterizations were first used to determine the oxygen-containing functional group species on the surface of graphene oxide. The structural model of graphene oxide was then modeled for density flooding theory (DFT) simulations using Biovia Materials Studio software, which was implemented in the CASTEP code. Our DFT calculations were performed using the generalized gradient approximation (GGA) as parameterized by the Perdew-Burke Ernzerhof (PBE) exchange-correlation functional. Additionally, we employed the norm-conserving pseudopotential to treat core electrons.
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Affiliation(s)
- Jianwei Zhai
- College of Mechanical Engineering, Donghua University, Shanghai, 201620, China
| | - Jinye Cui
- College of Mechanical Engineering, Donghua University, Shanghai, 201620, China
| | - Jinhua Zhang
- College of Mechanical Engineering, Donghua University, Shanghai, 201620, China
| | - Jun Hu
- Institute of Artificial Intelligence, Donghua University, Shanghai, 201620, China.
| | - Zhou Yu
- Institute of Artificial Intelligence, Donghua University, Shanghai, 201620, China.
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Pradhan KR, Arba Mosquera S. Comparing high and low energy outcomes on day one for SmartSight myopic-astigmatism treatments with the SCHWIND ATOS: a retrospective case series. BMC Ophthalmol 2023; 23:328. [PMID: 37464345 DOI: 10.1186/s12886-023-03076-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 07/12/2023] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND Impact of low energy asymmetric spacings vs. high energy symmetric spacings on the immediate/early (postoperative day 1 (POD1)) outcomes of SmartSight lenticule extraction for myopic astigmatism with a new femtosecond laser system. METHODS The first 112 eyes of 56 patients consecutively treated using low energy asymmetric spacings (Group A; Study group) were compared at POD1 to the last 112 eyes of 56 patients consecutively treated using high energy symmetric spacings (Group S; Controls). Mean age of the patients was 28 ± 5 years with a mean spherical equivalent of -4.41 ± 1.76 diopters (D) and a mean magnitude of refractive astigmatism of 0.89 ± 0.82 D. RESULTS Laser Energy was -25 ± 1nJ lower for asymmetric treatments (p < .0001); Spot and Track distances were + 0.7 ± 0.1 µm larger and -0.8 ± 0.1 µm tighter for asymmetric treatments, respectively (p < .0001 for both). At POD1, astigmatism was -0.08 ± 0.02D lower for asymmetric treatments (p < .0003); uncorrected and corrected visual acuities (UDVA and CDVA, respectively) were -0.03 ± 0.01logMAR better for asymmetric treatments (p < .0007); differences between postop UDVA and preop CDVA along with change in CDVA were + 0.3 ± 0.1lines better for asymmetric treatments (p < .0003). CONCLUSIONS Lenticule extraction treatment using SmartSight is safe and efficacious already at POD1. Findings suggest that low energy asymmetric spacings may further improve the immediate and short-term outcomes of SmartSight lenticule extraction in the treatment of myopic astigmatism compared to conventional settings (high energy symmetric spacings).
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Affiliation(s)
- Kishore Raj Pradhan
- Matrika Eye Center, Dhunge Dhara Marg, Ward number 9, Kathmandu, 44600, Nepal
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Radmilović MD, Drvenica IT, Rabasović MD, Ilić VL, Pavlović D, Oasa S, Vukojević V, Perić M, Nikolić SN, Krmpot AJ. Interactions of ultrashort laser pulses with hemoglobin: Photophysical aspects and potential applications. Int J Biol Macromol 2023:125312. [PMID: 37302636 DOI: 10.1016/j.ijbiomac.2023.125312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/16/2023] [Accepted: 06/08/2023] [Indexed: 06/13/2023]
Abstract
Hemoglobin (Hb), a life-sustaining and highly abundant erythrocyte protein, is not readily fluorescent. A few studies have already reported Two-Photon Excited Fluorescence (TPEF) of Hb, however, the mechanisms through which Hb becomes fluorescent upon interaction with ultrashort laser pulses are not completely understood. Here, we characterized photophysically this interaction on Hb thin film and erythrocytes using fluorescence spectroscopy upon single-photon/two-photon absorption, and UV-VIS single-photon absorption spectroscopy. A gradual increase of the fluorescence intensity, ending up with saturation, is observed upon prolonged exposure of Hb thin layer and erythrocytes to ultrashort laser pulses at 730 nm. When compared to protoporphyrin IX (PpIX) and oxidized Hb by H2O2, TPEF spectra from a thin Hb film and erythrocytes showed good mutual agreement, broad peaking at 550 nm, supporting hemoglobin undergoes degradation and that same fluorescent specie(s) originating from the heme moiety are generated. The uniform square shaped patterns of the fluorescent photoproduct exhibited the same level of the fluorescence intensity even after 12 weeks from the formation, indicating high photoproduct stability. We finally demonstrated the full potential of the formed Hb photoproduct with TPEF scanning microscopy towards spatiotemporally controlled micropatterning in HTF and single human erythrocyte labelling and tracking in the whole blood.
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Affiliation(s)
| | - Ivana T Drvenica
- Institute for Medical Research, National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | | | - Vesna Lj Ilić
- Institute for Medical Research, National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Danica Pavlović
- Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia
| | - Sho Oasa
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Vladana Vukojević
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Mina Perić
- Faculty of Biology, University of Belgrade, Belgrade, Serbia; Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Stanko N Nikolić
- Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia; Division of Arts and Sciences, Texas A&M University at Qatar, Doha, Qatar
| | - Aleksandar J Krmpot
- Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia; Division of Arts and Sciences, Texas A&M University at Qatar, Doha, Qatar.
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21
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Jiang P, Xu Q, Zhang R, Bai H, Li K, Copner N, Gong Y. High-temperature and stress response behavior of femtosecond laser pulses inscribed eccentric fiber Bragg gratings. Heliyon 2023; 9:e17185. [PMID: 37332934 PMCID: PMC10276224 DOI: 10.1016/j.heliyon.2023.e17185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 06/08/2023] [Accepted: 06/09/2023] [Indexed: 06/20/2023] Open
Abstract
Eccentric fiber Bragg grating (EFBG) is inscribed in standard communication single-mode fiber using femtosecond laser pulses, and the temperature and strain sensing characteristics are experimentally demonstrated and analyzed. The EFBG exhibits strong thermal stability and good robustness in high-temperature measurement up to 1000 °C, and undergoes different thermal sensitivities during Bragg peak and the strong resonance coupled cladding spectral comb. The temperature sensitivity linearly increases with respect to the effective index of the resonant modes. Such a situation also occurs in axial strain measurement. These characteristics are of high interest for multiparametric sensing at high temperatures.
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Affiliation(s)
- Peng Jiang
- College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China
- Engineering Technology Research Center for Ultrafast Optics and Advanced Material of Baoji, Baoji, 721016, China
- Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz Technology, Baoji, 721016, China
| | - Qiang Xu
- College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China
- Engineering Technology Research Center for Ultrafast Optics and Advanced Material of Baoji, Baoji, 721016, China
- Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz Technology, Baoji, 721016, China
| | - Rui Zhang
- College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China
| | - Haiping Bai
- College of Science, Inner Mongolia Agricultural University, Hohhot, 010018, China
| | - Kang Li
- School of Engineering, University of South Wales, Cardiff, CF37 1DL, United Kingdom
| | - Nigel Copner
- School of Engineering, University of South Wales, Cardiff, CF37 1DL, United Kingdom
| | - Yongkang Gong
- School of Physics and Astronomy, Cardiff University, CF24 3AA, United Kingdom
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22
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Bellucci C, Mora P, Tedesco SA, Bellucci R, Gandolfi S. Posterior capsule dynamics during femtosecond laser lens fragmentation. Int Ophthalmol 2023:10.1007/s10792-023-02739-6. [PMID: 37191929 PMCID: PMC10400471 DOI: 10.1007/s10792-023-02739-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 05/06/2023] [Indexed: 05/17/2023]
Abstract
PURPOSE The dynamics of the posterior capsule during femtosecond laser lens fragmentation has received little attention in the literature. We analysed the movements of the posterior capsule to identify the rupture risk factors, if any, and to suggest possible modification of the laser spot energy pattern during fragmentation. MATERIALS AND METHODS Posterior capsule ruptures during fragmentation were identified over a 10-year period of femtosecond laser use. In addition, the dynamics of the posterior capsule were identified through the real-time swept-source OCT lateral view available during the surgeries. RESULTS Out of the 1465 laser cataract procedures performed, we recorded 1 case of posterior capsule rupture during lens fragmentation, which was caused by eye movement that was detected but ignored by the surgeon. Three types of posterior capsule dynamics were identified, all related to a gas bubble formation during the first part of the lens fragmentation. In eyes with a hard nucleus, the concussion of the posterior capsule was evident, however, with no capsule rupture. DISCUSSION Maintaining good docking throughout the whole procedure seems important in avoiding a posterior capsule cut by the femtosecond laser. In addition, a Gaussian pattern of spot energy is suggested when fragmenting hard cataracts.
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Affiliation(s)
- Carlo Bellucci
- Ophthalmology Unit, Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126, Parma, Italy.
| | - Paolo Mora
- Ophthalmology Unit, Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126, Parma, Italy
| | - Salvatore Antonio Tedesco
- Ophthalmology Unit, Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126, Parma, Italy
| | | | - Stefano Gandolfi
- Ophthalmology Unit, Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126, Parma, Italy
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23
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Liu S, Yu L, Zhao Y, Zhou X. Changes in the posterior corneal surface after femtosecond laser-assisted lenticule intrastromal keratoplasty (LIKE) performed into a pocket (SMI-LIKE) or under a flap (FS-LIKE). Eye Vis (Lond) 2023; 10:23. [PMID: 37122005 PMCID: PMC10150533 DOI: 10.1186/s40662-023-00337-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 03/16/2023] [Indexed: 05/02/2023]
Abstract
BACKGROUND To compare the changes in posterior corneal surface after small-incision lenticule intrastromal keratoplasty (SMI-LIKE) and femtosecond laser-assisted lenticule intrastromal keratoplasty (FS-LIKE) for hyperopia correction. METHODS In this prospective comparative randomized study, 23 eyes with hyperopia were recruited. Eyes were categorized into two groups-SMI-LIKE group (11 eyes) and FS-LIKE group (12 eyes). Lenticules from myopia small incision lenticule extraction were implanted into a pocket (SMI-LIKE group) or at a depth of 100 µm under a flap (FS-LIKE group). Posterior corneal elevations in the center, mid-periphery, and periphery, as well as mean keratometry of the posterior corneal surface (Kmb) were measured using a Pentacam over a three-month follow-up. RESULTS All surgeries were completed successfully and no complications occurred. At one day postoperatively, there was a slight backward change with SMI-LIKE and a forward change with FS-LIKE in the central region of the posterior corneal elevation. Conversely, the peripheral area showed forward displacement in SMI-LIKE and an apparent backward change in FS-LIKE. The mid-peripheral regions manifested a backward change after the procedure throughout the entire follow-up in both groups. Kmb exhibited flattening at one month postoperatively and subsequently returned to its original level at three months after SMI-LIKE while in FS-LIKE, Kmb steepened after lenticule implantation with a significant change noted at one day postoperatively (P = 0.001). CONCLUSIONS Posterior corneal surface after SMI-LIKE and FS-LIKE exhibited different change patterns in various corneal regions, with the most prominent change occurring at one day postoperatively during the three-month follow-up. TRIAL REGISTRATION Chinese Clinical Trial Registry: ChiCTR-ONC-16008300. Registered on Apr 18th, 2016. http://www.chictr.org.cn/edit.aspx?pid=14090&htm=4.
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Affiliation(s)
- Shengtao Liu
- Department of Ophthalmology and Optometry, Eye and ENT Hospital of Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Fudan University, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
- Affiliated Eye Hospital of Nanchang University, Nanchang, China
| | - Lanhui Yu
- Affiliated Eye Hospital of Nanchang University, Nanchang, China
| | - Yu Zhao
- Department of Ophthalmology and Optometry, Eye and ENT Hospital of Fudan University, Shanghai, China.
- NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Fudan University, Shanghai, China.
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China.
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China.
| | - Xingtao Zhou
- Department of Ophthalmology and Optometry, Eye and ENT Hospital of Fudan University, Shanghai, China.
- NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Fudan University, Shanghai, China.
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China.
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China.
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24
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Feng Y, He R, Qu M, Ma Q, Tian H. Sub-Bowman keratomileusis versus femtosecond laser in situ keratomileusis on the long-term visual recovery: A comparative study. Indian J Ophthalmol 2023; 71:1899-1903. [PMID: 37203052 PMCID: PMC10391504 DOI: 10.4103/ijo.ijo_1543_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023] Open
Abstract
Purpose To explore the long-term visual quality of the same subjects after sub-Bowman keratomileusis (SBK) or femtosecond laser in situ keratomileusis (FS-LASIK). Methods This prospective study included patients screened for corneal refractive surgery at the Refractive Surgery Center of our Hospital between November 2017 and March 2018. One eye underwent SBK, while the other eye underwent FS-LASIK. Total higher-order aberrations, coma aberrations, and clover aberrations were evaluated before and at 1 month and 3 years after the procedure. The visual satisfaction of both eyes was investigated, respectively. The participants completed a surgical satisfaction questionnaire. Results Thirty-three patients were included. There were no significant differences in total higher-order aberrations, coma aberrations, and clover aberrations between the two procedures before and 1 month and 3 years after surgery (all P > 0.05), except for the total coma aberrations in FS-LASIK were significantly higher compared with the SBK group at 1 month after surgery [0.51 (0.18, 0.93) vs. 0.77 (0.40, 1.22), P = 0.019]. The surgical satisfaction questionnaire scores of the SBK group and the FS-LASIK group were 9.8 ± 0.8 and 9.8 ± 0.8, respectively, at 1 month, and 9.7 ± 0.9 and 9.7 ± 1.0, respectively, at 3 years (all P > 0.05). Conclusion There were no differences in corneal aberrations and satisfaction between SBK and FS-LASIK procedures at 1 month and 3 years.
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Affiliation(s)
- Yi Feng
- Shanxi Eye Hospital, Shanxi Eye Hospital, Taiyuan, China
| | - Rui He
- Shanxi Eye Hospital, Shanxi Eye Hospital, Taiyuan, China
| | - Min Qu
- Shanxi Eye Hospital, Shanxi Eye Hospital, Taiyuan, China
| | - Qiuxia Ma
- Shanxi Eye Hospital, Shanxi Eye Hospital, Taiyuan, China
| | - Huiqin Tian
- Shanxi Eye Hospital, Shanxi Eye Hospital, Taiyuan, China
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25
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Turkkal F, Culhaoglu AK, Sahin V. Composite-veneering of polyether-ether-ketone (PEEK): evaluating the effects of different surface modification methods on surface roughness, wettability, and bond strength. Lasers Med Sci 2023; 38:95. [PMID: 36995426 DOI: 10.1007/s10103-023-03749-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 12/03/2022] [Indexed: 03/31/2023]
Abstract
This study aimed to evaluate the effects of different surface modification methods on the surface roughness, contact angle, and bond strength of composite-veneer materials of polyether-ether-ketone (PEEK). Fifty-five specimens (n = 11) with a size of 7 × 7 × 2 mm were cut out from PEEK discs. The specimens were divided into five groups with different surface treatments: no treatment (NO) (control group), sulfuric acid (SA), plasma (P), femtosecond laser (FS), and Nd-YAG laser (NY). After the surface treatments, the specimens were checked for roughness, contact angle, and bond strength of the composite-veneer material. Data were analyzed with the Welch test for roughness, contact angle, and bond strength parameters. Individual Pearson correlation tests were executed for all surface treatment groups to determine any significant correlations among roughness, contact angle, and bond strength parameters (P < .001). Roughness, contact angle, and bond strength values were affected by surface modification methods (P < .001). In comparison to the control group, NY and FS treatments increased the surface roughness and bond strength; they also provided bond strength values comparable to the SA group. When the relationship between the variables was examined, no correlation was seen between roughness, contact angle, and bond strength values for the NY, SA, and control groups (P > .05); however, significant correlations were determined between the contact angle and surface roughness values for the P and FS groups (P < .05). Femtosecond and Nd-YAG laser treatments are viable surface modification alternatives to the sulfuric acid treatment for the PEEK material.
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Affiliation(s)
| | - Ahmet Kursad Culhaoglu
- Department of Prosthodontics, Faculty of Dentistry, Kırıkkale University, Yenisehir Mah, Celebi Sokak No: 1, 71450, Kırıkkale, Türkiye.
- Department of Prosthodontics, Faculty of Dentistry, Sağlık Bilimleri Gülhane Univesity, Emrah Mah. 06018 Etlik/Keçiören/ANKARA, Ankara, Türkiye.
| | - Volkan Sahin
- Department of Prosthodontics, Faculty of Dentistry, Kırıkkale University, Yenisehir Mah, Celebi Sokak No: 1, 71450, Kırıkkale, Türkiye
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Cao L, Zhu Y, Wang X. A novel method of high-throughput micro-and nanomechanical sample fabrication. Ultramicroscopy 2023; 248:113714. [PMID: 36905745 DOI: 10.1016/j.ultramic.2023.113714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/18/2023] [Accepted: 03/02/2023] [Indexed: 03/07/2023]
Abstract
There is an increasing interest in understanding materials' mechanical properties at small length scales. Mechanical testing from nano- to meso-scale has seen a rapid development over the last decade, leading to a high demand of sample fabrication. In the present work, a novel method of micro-and nanomechanical sample preparation is introduced based on a new technique combining femtosecond laser and focused ion beam (FIB), namely LaserFIB. The new method greatly simplifies the sample preparation workflow by taking advantage of the fast milling-rate of femtosecond laser and the high precision of FIB. It significantly improves the processing efficiency and success rate, allowing for the high-throughput preparation of reproducible micro- and nanomechanical specimens. The novel method has far more advantages: (1) it allows for site-specific sample preparation based on scanning electron microscope (SEM) characterization (lateral and depth direction of bulk material) (2) following the new workflow, mechanical specimens are still connected to the bulk by its natural bonding, yielding more reliable mechanical testing results; (3) it extends the processable sample size to meso-scale while still remaining high precision and high efficiency; (4) the seamless transfer between laser and FIB/SEM chamber greatly reduces the risk of sample damage and is very friendly for environmental sensitive materials. The new method solves critical problems for high-throughput multiscale mechanical sample preparation, greatly contributing to the development of nano to meso-scale mechanical testing by making sample preparation efficient and convenient.
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27
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Zaki Ewiss MA, Mahmoud MA, Steiner R. Effect of femtosecond laser interaction with human fibroblasts: a preliminary study. Lasers Med Sci 2023; 38:83. [PMID: 36867297 PMCID: PMC9984333 DOI: 10.1007/s10103-023-03740-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 02/18/2023] [Indexed: 03/04/2023]
Abstract
In in vitro methods and cell culture models, femtosecond (fs) laser interaction has been employed to assess its effect on the proliferation and morphology of human skin fibroblasts. We cultured a primary human skin fibroblast cell line on a glass plate, passages 17-23. The cells were irradiated with a 90-fs laser at a wavelength of 800 nm and a repetition rate of 82 MHz. The target received an average power of 320 mW for 5, 20, and 100 s, corresponding to the radiation exposures of 22.6, 90.6, and 452.9 J/cm2, respectively. Using a laser scanning microscopy technique, the photon densities were measured to be 6.4 × 1018, 2.6 × 1019, and 1.3 × 1020 photons/cm2 in a spot area of 0.07 cm2; the recorded spectra were obtained from the laser interaction after 0.00, 1.00, 25.00, and 45.00 h. The cell count and morphological changes showed that the cultured cells were affected by laser irradiation under photon stress; some fibroblasts were killed, while others were injured and survived. We discovered evidence of the formation of several coenzyme compounds, such as flavin (500-600 nm), lipopigments (600-750 nm), and porphyrin (500-700 nm). This study is motivated by the future development of a novel, ultra-short fs laser system and the need to develop a basic in vitro understanding of photon-human cell interaction. The cell proliferation indicated that cells are partly killed or wounded. The exposure of fibroblasts to fs laser fluence up to 450 J/cm2 accelerates cell growth of the viable residual cell.
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Affiliation(s)
- M A Zaki Ewiss
- Department of Physics, Faculty of Science, Cairo University, Giza, 12630, Egypt.
| | - M A Mahmoud
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - R Steiner
- Institute of Laser Technologies in Medicine and Metrology at the University of Ulm, 89081, Ulm, Germany
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28
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Taha S, Mohamed WR, Elhemely MA, El-Gendy AO, Mohamed T. Tunable femtosecond laser suppresses the proliferation of breast cancer in vitro. J Photochem Photobiol B 2023; 240:112665. [PMID: 36736031 DOI: 10.1016/j.jphotobiol.2023.112665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 12/29/2022] [Accepted: 01/27/2023] [Indexed: 01/30/2023]
Abstract
Worldwide, the most frequently diagnosed cancer is female breast cancer, and it poses a serious global health threat. Traditional cancer therapies are associated with various side effects, so developing better therapies for breast cancer is necessary, such as laser therapy which could be a promising treatment option. The aim of the current study was to investigate the femtosecond laser irradiation effect on breast cancer using T47D cell line as an in vitro model. Cells were seeded at a density of 5 × 104 cells/well in 96-well plates and incubated overnight. After that, the cells were exposed to femtosecond laser irradiation at various wavelengths falling in the UV, visible, and IR ranges for 3, 5, or 10 min and at a constant power of 100 mW. Cell viability was measured directly and 24 h after femtosecond laser irradiation using MTT assay. When using different femtosecond laser irradiation parameters, especially the 380 and 400 nm femtosecond laser irradiation, there was significant inhibition of breast cancer cell growth, either directly or 24 h after femtosecond laser exposure. Also, 420 and 440 nm significantly affected the viability of the cells. It was also observed that increasing exposure time enhances the observed effect, so 10 min exposure time was the best time of exposure. However, 700, 720, 750, and 780 nm did not significantly affect the cells viability with different exposure times. It was possible to conclude from the aforementioned results that femtosecond laser irradiation exerted a significant anticancer effect against T47D cells. Consequently, the femtosecond laser could be used successfully for breast cancer management.
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Affiliation(s)
- Safaa Taha
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Wafaa R Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Mai A Elhemely
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Ahmed O El-Gendy
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Faculty of Pharmacy, Department of Microbiology and Immunology, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Tarek Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Department of Engineering, Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Indonesia.
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29
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Boden KT, Julich-Haertel H, Rickmann A, Szurman P, Januschowski K, Seitz B, Schlosser R, Wakili P, Müller LJ. Efficacy of a new fragmentation pattern in femtosecond laser-assisted cataract surgery with the Ziemer FEMTO LDV Z8. Int Ophthalmol 2023:10.1007/s10792-022-02619-5. [PMID: 36781625 DOI: 10.1007/s10792-022-02619-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 12/20/2022] [Indexed: 02/15/2023]
Abstract
PURPOSE To determine the efficacy of different fragmentation patterns in femtosecond laser-assisted cataract surgery (FLACS) using Ziemer FEMTO LDV Z8. METHODS We compared three different types of surgery: conventional cataract surgery (CCS), FLACS with conventional radial slices (named No-Spiderweb), and FLACS with a novel fragmentation pattern (radial slices combined with one or two rings) called "Spiderweb." Visual acuity (VA), nuclear opacity (NO) according to the Lens Opacities Classification System (LOCS lll), effective phacoemulsification time (EPT) and vacuum time were obtained for 845 eyes. RESULTS Using FLACS (Spiderweb + No-Spiderweb), EPT was significantly reduced by 26% compared to CCS (FLACS: 2.46 ± 2.60 s; CCS: 3.34 ± 2.89 s; ΔM = - 0.88 s, p < .001). Furthermore, EPT as a function of progression of lens opacity was found to be not only lower in Spiderweb compared to CCS, but also in comparison with No-Spiderweb. At NO3, a significant reduction of 65% in EPT was observed by using Spiderweb compared to CCS (Spiderweb: 0.68 ± 1.23 s; CCS: 1.96 ± 1.53 s; ΔM = - 1.28 s, p <.001). Interestingly, EPT at NO3 was also significantly reduced by 57% in Spiderweb compared to No-Spiderweb (Spiderweb: 0.68 ± 1.23 s; No-Spiderweb: 1.57 ± 1 .59 s; ΔM = - 0.90 s, p <.001). The use of Spiderweb only marginally extends the vacuum time compared to No-Spiderweb by 11 s (Spiderweb: 209.13 ± 35.83 s; No-Spiderweb: 198.35 ± 36.84 s; p = .003) and the postoperative improved VA showed no significant difference among the different types of surgery (all ps ≥ .05). CONCLUSION FLACS significantly reduces EPT compared to CCS. Furthermore, the novel Spiderweb pattern significantly reduces EPT in patients with a cataract of NO3 compared to CCS, but also to FLACS with the existing radial pattern (No-Spiderweb).
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Affiliation(s)
- Karl Thomas Boden
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany. .,Klaus Heimann Eye Research Institute (KHERI), An der Klinik 10, 66280, Sulzbach, Germany.
| | - Henrike Julich-Haertel
- Klaus Heimann Eye Research Institute (KHERI), An der Klinik 10, 66280, Sulzbach, Germany
| | - Annekatrin Rickmann
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany.,Centre for Ophthalmology, University Eye Hospital Tuebingen, Schleichstr. 12, 72076, Tübingen, Germany.,Klaus Heimann Eye Research Institute (KHERI), An der Klinik 10, 66280, Sulzbach, Germany
| | - Peter Szurman
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany.,Centre for Ophthalmology, University Eye Hospital Tuebingen, Schleichstr. 12, 72076, Tübingen, Germany.,Klaus Heimann Eye Research Institute (KHERI), An der Klinik 10, 66280, Sulzbach, Germany
| | - Kai Januschowski
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany.,Centre for Ophthalmology, University Eye Hospital Tuebingen, Schleichstr. 12, 72076, Tübingen, Germany.,Klaus Heimann Eye Research Institute (KHERI), An der Klinik 10, 66280, Sulzbach, Germany
| | - Berthold Seitz
- Department of Ophthalmology, Saarland University Medical Center, Kirrberger Str. 100, 66424, Homburg, Saar, Germany
| | - Rosemarie Schlosser
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany
| | - Philip Wakili
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany
| | - Lisa Julia Müller
- Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, An der Klinik 10, 66280, Sulzbach, Germany
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Ma J, Kao X, Sun X, Zhang M, Liu Y. Clinical observation of femtosecond laser-assisted cataract surgery for diabetic cataract. Am J Transl Res 2023; 15:249-255. [PMID: 36777870 PMCID: PMC9908458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 11/09/2022] [Indexed: 02/14/2023]
Abstract
OBJECTIVE To observe the clinical efficacy of femtosecond laser-assisted cataract surgery (FLACS) for diabetic cataract (DC). METHODS One hundred and seven cases of DC admitted between August 2018 and August 2021 were enrolled, and their clinical data were retrospectively analyzed. Of them, 53 cases treated with conventional phacoemulsification (Phaco) cataract surgery (CPS) were set as the control group (the Con) and 54 cases receiving FLACS were set as the observation group (the Obs). Clinical data such as effective phaco time (EPT), color doppler energy (CDE), best corrected visual acuity (BCVA), visual quality, corneal endothelial cell (CEC) count (CECC), and complication rate were compared and analyzed. Finally, multivariate Cox regression analysis was performed to analyze the prognostic factors based on the incidence of complications in DC patients. RESULTS The Obs had significantly lower EPT and CDE compared to the Con, as well as markedly elevated BCVA and visual quality at one month after operation compared to the preoperative levels and the Con. The CECC of the Obs differed insignificantly from that before surgery and was higher versus the Con. Moreover, the incidence of postoperative complications (corneal edema, fibrin exudation, pigment dispersion, and posterior synechia of the iris) was lower in the Obs. Moreover, the treatment method was an independent prognostic factor affecting the prognosis of DC patients. CONCLUSIONS The above analysis suggests the superior efficacy of FLACS to CPS for DC, as it can more significantly reduce EPT, CDE, CEC loss, and the incidence of postoperative complications with a positive effect on improving BCVA, visual quality, and patient prognosis.
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Li W, Ding Q, Sun F, Liu B, Yuan F, Zhang L, Bao R, Gu J, Lin Y. Fatigue behavior of zirconia with microgrooved surfaces produced using femtosecond laser. Lasers Med Sci 2023; 38:33. [PMID: 36598586 DOI: 10.1007/s10103-022-03679-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 11/19/2022] [Indexed: 01/05/2023]
Abstract
Femtosecond laser is a promising surface treatment tool for zirconia implant. In this study, the fatigue behavior of zirconia specimens with microgrooved surfaces formed by femtosecond laser is reported. One hundred sixty CAD/CAM zirconia bars (20 mm × 4 mm × 1.4 mm) were evenly divided into four groups with different surface: as sintered; sandblasted with 110 μm Al2O3; femtosecond laser produced microgrooves having 50 μm width, 30 μm depth, and 100 μm pitch; microgrooves having 30 μm width, 20 μm depth, and 60 μm pitch. The femtosecond laser formed micro/nanostructured microgrooves with precise size on zirconia surfaces. XRD analysis indicated that microgrooved surface showed no obvious tetragonal-to-monoclinic phase transformation. The fatigue strength of sandblasted specimens (728 MPa) was significantly higher than that of as sintered specimens (570 MPa). However, the fatigue strength of specimens with microgrooved surface decreased to about 360-380 MPa. The results suggest femtosecond laser is an effective technique to regulate the surface microtopography of zirconia, while further investigations are needed to improve its fatigue behavior.
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Affiliation(s)
- Wenjin Li
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Qian Ding
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Fengbo Sun
- School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Binchao Liu
- School of Aeronautic Science and Engineering, Beihang University, 100191, Beijing, China
| | - Fusong Yuan
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, 100081, China
| | - Lei Zhang
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China.
| | - Rui Bao
- School of Aeronautic Science and Engineering, Beihang University, 100191, Beijing, China
| | - Jinghua Gu
- School of Materials Science and Engineering, Beihang University, Beijing, 100191, China
| | - Yuanhua Lin
- School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
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Malyugin BE, Belodedova A, Antonova O, Gelyastanov A, Tuuminen R, Levinger E, Achiron A, Knyazer B. Clinical comparison of manual and laser-cut corneal tunnel for intrastromal air injection in femtosecond laser-assisted deep anterior lamellar keratoplasty (DALK). Graefes Arch Clin Exp Ophthalmol 2023; 261:185-191. [PMID: 35896678 DOI: 10.1007/s00417-022-05765-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/30/2022] [Accepted: 07/09/2022] [Indexed: 01/04/2023] Open
Abstract
PURPOSE The most crucial step in deep anterior lamellar keratoplasty (DALK) is to achieve a bare Descemet's membrane. We aimed to assess a new femtosecond laser software that allows for a precise intrastromal tunnel creation for big bubble (BB) air injection using a real-time microscope-integrated optical coherence tomography. MATERIALS AND METHODS A retrospective review of 61 eyes of 61 patients with keratoconus. Before introducing the new software update, DALK was performed using a partial-assisted femtosecond laser (partial-thickness circular cut followed by a lamellar cut) with manual intrastromal tunnel creation (partial FS-DALK group). After the software update, the femtosecond laser created the intrastromal tunnel (full FS-DALK group). RESULTS In the full FS-DALK group, the BB's formation was significantly higher (64.3% vs. 36.4%, p = 0.04), and surgery time was shorter (21.8 ± 5.1 vs. 25.6 ± 6.8 min, p = 0.025) than in the partial FS-DALK. Penetrating keratoplasty conversion rate (7.1% vs. 15.1%, p = 0.432) was similar between the groups. Both groups showed statistically significant improvement in uncorrected and corrected distance visual acuity, central corneal thickness, surface asymmetry, and regularity indices. Endothelial cell density loss at 12 and 18 months was lower in the full compared with the partial FS-DALK group (12 months:10.0% vs. 16; 18 months: 10.7 vs. 16.5%, p < 0.001 for both comparisons). CONCLUSIONS Creating the intrastromal guiding tunnel using FS laser for air injection resulted in a higher rate of BB formation, reduced long-term endothelial cell loss, and operating room time.
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Affiliation(s)
- Boris E Malyugin
- S. Fyodorov Eye Microsurgery Federal State Institution, Beskudnikovsky Blvd., 59a, 127486, Moscow, Russian Federation. .,A.I. Yevdokimov Moscow State University of Medicine and Dentistry, Moscow, Russian Federation. .,Department of Ophthalmology, Soroka University Medical Center and Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
| | - Alexandra Belodedova
- S. Fyodorov Eye Microsurgery Federal State Institution, Beskudnikovsky Blvd., 59a, 127486, Moscow, Russian Federation
| | - Olga Antonova
- S. Fyodorov Eye Microsurgery Federal State Institution, Beskudnikovsky Blvd., 59a, 127486, Moscow, Russian Federation
| | - Aslan Gelyastanov
- S. Fyodorov Eye Microsurgery Federal State Institution, Beskudnikovsky Blvd., 59a, 127486, Moscow, Russian Federation
| | - Raimo Tuuminen
- Helsinki Retina Research Group, University of Helsinki, Helsinki, Finland.,Department of Ophthalmology, Kymenlaakso Central Hospital, Kotka, Finland
| | - Eliya Levinger
- Tel-Aviv Sourasky Medical Center and Sackler School of Medicine, Sackler Faculty of Medicine, Tel Aviv University, Dafna St 5, Tel Aviv-Yafo, Israel
| | - Asaf Achiron
- Tel-Aviv Sourasky Medical Center and Sackler School of Medicine, Sackler Faculty of Medicine, Tel Aviv University, Dafna St 5, Tel Aviv-Yafo, Israel.
| | - Boris Knyazer
- Department of Ophthalmology, Soroka University Medical Center and Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Pradhan KR, Arba Mosquera S. Twelve-month outcomes of a new refractive lenticular extraction procedure. J Optom 2023; 16:30-41. [PMID: 34949535 PMCID: PMC9811368 DOI: 10.1016/j.optom.2021.11.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Revised: 11/02/2021] [Accepted: 11/11/2021] [Indexed: 06/07/2023]
Abstract
BACKGROUND To evaluate the 12-month refractive and visual outcomes of Small Incision Guided Human-cornea Treatment (SmartSight®, SCHWIND eye-tech-solutions, Kleinostheim, Germany) in the treatment of myopia corrections with low to moderate astigmatism with the use of a new femtosecond laser system. METHODS 221 eyes of 114 patients consecutively treated with SmartSight lenticule extraction were assessed. The mean age of the patients was 28±6 years at the time of treatment with a mean spherical equivalent refraction of -6.26±2.17D and mean astigmatism of 0.92±0.68D. Monocular corrected distance visual acuity (CDVA), uncorrected distance visual acuity (UDVA) were assessed pre- and post-operatively. Refractive changes have been determined in terms of changes in refraction, as well as changes in keratometric readings. The changes in central epithelial thickness have been determined. RESULTS At twelve months post-operatively, mean UDVA was 20/21±2. Spherical equivalent showed a residual refraction of +0.48±0.31D with refractive astigmatism of 0.13±0.18D postoperatively. There was a slight decrease of -0.1 Snellen lines at 12-months follow-up. The same correction was determined using changes in refraction, as well as changes in keratometric readings. The central epithelial thickness increased by +3±2µm. Spherical equivalent correction within ±0.50D was achieved in 199 eyes (90%), and cylindrical correction in 221 (100%). Preoperative corrected distance visual acuity (CDVA) was 20/20 or better in 213 eyes (96%), and postoperative uncorrected (UDVA) was 20/20 or better in 205 eyes (93%). No eye had lost two or more Snellen lines of CDVA. CONCLUSIONS Myopic astigmatism correction with SmartSight provided good results for efficacy, safety, predictability, and visual outcomes at the twelve months of follow up. The central epithelial thickness barely increased by 3±2µm.
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Affiliation(s)
- Kishore Raj Pradhan
- Matrika Eye Center, Dhunge Dhara Marg, Ward number 9, Kathmandu 44600, Nepal.
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Barbosa Gonçalves T, Forseto ADS, Martins ADL, Pereira NC. Femtosecond laser-assisted Bowman layer transplantation for advanced keratoconus. Eur J Ophthalmol 2022; 33:11206721221143163. [PMID: 36471496 DOI: 10.1177/11206721221143163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
BACKGROUND/AIMS To assess the technical feasibility and outcomes of femtosecond laser-assisted Bowman layer transplantation (FLABOLT) in stabilizing progressive, advanced keratoconus, which is ineligible for corneal crosslinking. METHODS This single-center retrospective study included 50 eyes of 49 patients with progressive advanced keratoconus, ineligible for corneal crosslinking, that underwent FLABOLT with both the donor graft and recipient mid-stromal pocket using a femtosecond laser. RESULTS The mean follow-up was 13.2 ± 4.9 months (range 7-35 months). Donor graft preparation and accurate dissection of the recipient mid-stromal pocket were successful in 96% and 100% of cases, respectively. The mean maximum keratometry decreased by 1.93 D at 6 months after surgery and there was no change in the mean preoperative best contact lens-corrected visual acuity (BCLVA). Three eyes developed hydrops postoperatively and recovered after clinical treatment. One eye that achieved useful BCLVA postoperatively, worsened 2 years after the surgery due to progressive corneal scarring and required corneal transplantation for visual rehabilitation. Preoperative corneal scarring was a risk factor for BCLVA loss. All other eyes remained stable (92%), and no other procedure was required until the last follow-up. CONCLUSION In this series, FLABOLT was successfully performed as an alternative to stabilize advanced progressive keratoconus. This technique is highly reproducible for graft preparation and recipient pocket dissection when assisted by femtosecond laser. Despite promising initial results, more studies with longer follow-up periods are needed to evaluate the effectiveness of FLABOLT in stabilizing advanced progressive keratoconus.
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Affiliation(s)
- Thiago Barbosa Gonçalves
- Department of Ophthalmology, 580074Sorocaba Eye Hospital, Sorocaba Eye Bank, Sorocaba, São Paulo, Brazil
| | - Adriana Dos Santos Forseto
- Department of Ophthalmology, 580074Sorocaba Eye Hospital, Sorocaba Eye Bank, Sorocaba, São Paulo, Brazil
- Eye Clinic Day Hospital, São Paulo, São Paulo, Brazil
| | - Anderson de Lima Martins
- Department of Ophthalmology, 580074Sorocaba Eye Hospital, Sorocaba Eye Bank, Sorocaba, São Paulo, Brazil
| | - Nicolas Cesário Pereira
- Department of Ophthalmology, 580074Sorocaba Eye Hospital, Sorocaba Eye Bank, Sorocaba, São Paulo, Brazil
- Department of Ophthalmology, Federal University of São Paulo, São Paulo, Brazil
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Han T, Fu D, Xu Y, Ding X, Chen Z, Yu Z, Zhou X. Effect of incision location on with-the-rule astigmatism correction after SMILE. Eur J Ophthalmol 2022; 33:11206721221143260. [PMID: 36464663 DOI: 10.1177/11206721221143260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
PURPOSE To explore the influence of two different incision positions of small incision lenticule extraction (SMILE) on astigmatism correction. METHODS A total of 86 eyes of 86 patients who underwent SMILE surgery were included in this retrospective study. The criteria included that the preoperative astigmatism axis to be within 165° to 180° or 5° to 15°. All eyes were divided into two groups according to the incision position. The incisions of 34 eyes were either located on the superior temporal side of the right eye or superior nasal side of the left eye (120° group), and 52 eyes were located on the superior side (90° group). Vector analysis was used to analyze pre- and postoperative 3-month astigmatism, while subgroup analysis was applied according to the preoperative astigmatism. RESULTS No significant difference of preoperative parameters was found between the two groups (P > 0.05). The efficacy and safety indexes were 1.11 ± 0.16 and 1.15 ± 0.16 in the 120° group, the numbers were 1.15 ± 0.17 and 1.16 ± 0.14 in the 90° group (P = 0.629 and P = 0.871). There was no significant difference in target-induced astigmatism (TIA), TIA axis, surgically induced astigmatism (SIA) magnitude, SIA axis, distance vision (DV) magnitude, DV axis, correction index (CI), angle of error (AofE), |AofE|, magnitude of error (MofE), index of success (IOS), or flattening index (FI) between 120° group and 90° group (P > 0.05). No significant difference was found in the subgroup analysis (P > 0.05). CONCLUSIONS The incision position has limited astigmatic effect, and the operation-induced astigmatism of SMILE surgery after 3 months was little.
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Affiliation(s)
- Tian Han
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Dan Fu
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Ye Xu
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Xuan Ding
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Zhuoyi Chen
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Zhiqiang Yu
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
| | - Xingtao Zhou
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China
- Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China
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AlMokhatieb AA. The effect of 400 nm femtosecond laser and Zn(II)chlorin e6 methyl ester (Zn(II)e6Me) photosensitizer on disinfection of radicular dentin bonded to glass fiber post. Photodiagnosis Photodyn Ther 2022; 40:103120. [PMID: 36116674 DOI: 10.1016/j.pdpdt.2022.103120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/11/2022] [Accepted: 09/13/2022] [Indexed: 12/14/2022]
Abstract
AIM To assess and compare push-out bond strength (PBS) when canal disinfected with 5.25% NaOCl, 400 nm femtosecond laser, and natural PS activated by PDT (CP and Zn (II) Ce6 methyl ester) on bond efficacy of radicular dentin bonded to glass fiber post. MATERIAL AND METHODS A sum of 40 non-traumatic, cautiously extracted with closed apex human mandibular premolars were collected and decoronated up to the cement-o-enamel junction. Canals of all specimens were cleaned and shaped using a Protaper universal NiTi system via a crown-down approach, then finally dried out and obturated with gutta-percha. Post alignment space was formed with peso reamers and sanitized. Then samples were randomly allocated into four groups as per the radicular dentin designated disinfection protocols. Group 1 disinfected with curcumin photosensitizer + EDTA, group 2: 5.25% NaOCl and EDTA, group 3: Zn (II) Ce6 methyl ester and EDTA and group 4 sanitized with 400 nm fs-laser + EDTA. GFP was cemented into the radicular canal space and specimens were placed in a thermocycler. Segmentation of the root was done at three levels (coronal, middle, and apical) and positioned in a universal testing machine for PBS analysis. Failure mode analysis was performed using a stereomicroscope and statistical analysis was executed by one-way ANOVA and Tukey multiple comparison tests at a statistically significant level of p < 0.05. RESULTS The highest PBS was revealed by group 2 canal disinfected with 5.25% NaOCl +17% EDTA (control) at coronal (9.49 ± 1.42 MPa) and middle (7.545 ± 0.15 MPa) root levels. Whereas, the lowest PBS was displayed by group 3: Zn (II) Ce6 methyl ester +17% EDTA at coronal (6.31 ± 0.54 MPa) middle (4.85 ± 0.11 MPa) root levels respectively. Intergroup comparison presented that radicular dentin disinfected with 400 nm femtosecond laser + 17% EDTA substantiated comparable PBS result to group 2 (control) at all three root levels (p > 0.05). Likewise, root surface disinfection with Curcumin activated by PDT+17% EDTA unveiled no statistically significant result for specimens disinfected with Zn(II) Ce6 methyl ester +17% EDTA(p > 0.05). Furthermore, apical root segments in all groups showed a substantial decrease in PBS value and were comparable (p > 0.05). CONCLUSION The bond efficacy of glass fiber post to radicular dentin disinfected with 400 nm femtosecond laser has the potential to be used as an alternative to conventional sodium hypochlorite.
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Affiliation(s)
- Ahmed A AlMokhatieb
- Conservative Dental Department, College of Dentistry, Prince Sattam bin Abdul Aziz University, Alkharj, Saudi Arabia.
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Huang H, Zhang P, Tang M, Shen L, Yu Z, Shi H, Tian Y. Biocompatibility of micro/nano structures on the surface of Ti6Al4V and Ti-based bulk metallic glasses induced by femtosecond laser. Biomater Adv 2022; 139:212998. [PMID: 35882146 DOI: 10.1016/j.bioadv.2022.212998] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 06/06/2022] [Accepted: 06/19/2022] [Indexed: 06/15/2023]
Abstract
Femtosecond laser surface modification has been proved to be a versatile technology to create various functional materials by modifying solid surface properties. An interesting experimental phenomenon is found by exposing a Ti6Al4V alloy and Ti-based metallic glass to femtosecond laser irradiation. The research results show that the femtosecond laser induces different micro-nano structures on the surfaces of Ti6Al4V alloy and Ti-based metallic glass. Spherical structure and LIPSS (Laser-induced periodic surface structures) can be formed on the surface of Ti6Al4V alloy after femtosecond laser irradiation. On the surface of Ti-based metallic glass, LIPSS, SWPSS (Super-wavelength periodic surface structure) and neatly arranged microholes structures can be found. Under the same laser parameters, the micro-nano structures showed different evolution trends on the Ti6Al4V alloy and Ti-based metallic glass surfaces. The difference in surface structure between Ti6Al4V alloy and Ti-based metallic glass is since amorphous materials have no crystal lattice and a fixed melting temperature. In addition, there are differences in the biocompatibility of different surface structures. The size and distance of the micro-pits on the surface of different structures determine the ability of cells to adhesion, proliferate and differentiate. This conclusion has important significance for the application of Ti6Al4V alloy and Ti-based metallic glass in the field of biomedicine.
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Affiliation(s)
- Hanxuan Huang
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China
| | - Peilei Zhang
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China; Fraunhofer Institute for Laser Technology ILT, Aachen 52074, Germany.
| | - Man Tang
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China
| | - Lei Shen
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China
| | - Zhishui Yu
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China.
| | - Haichuan Shi
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Shanghai Collaborative Innovation Center of Laser of Manufacturing Technology, Shanghai 201620, China
| | - Yingtao Tian
- Department of Engineering, Lancaster University, Lancaster LA1 4YW, United Kingdom
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Boral SK, Agarwal D, Mohanta A. Rhegmatogenous retinal detachment following femtosecond laser-assisted cataract surgery. Oman J Ophthalmol 2022; 15:215-217. [PMID: 35937752 PMCID: PMC9351959 DOI: 10.4103/ojo.ojo_308_2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 04/06/2022] [Accepted: 04/30/2022] [Indexed: 12/03/2022] Open
Abstract
Rhegmatogenous retinal detachment (RRD) following femtosecond laser-assisted cataract surgery (FLACS) has not been reported till date. We described the first case of RRD after FLACS. A 29-year-old male presented with complaints of sudden, painless dimness of vision in the left eye (LE) for the past 2 days. He was operated for refractive lens exchange in both eyes for high myopia using FLACS 3 months back. On examination, his LE vision was perception of light and accurate projection of rays with fundus showing bullous RRD. His right eye fundus was absolutely normal with 20/20 vision. A 25-gauge vitrectomy was performed in LE. The retina was settled with silicone oil (1300 centistokes) endotamponade. After 4 weeks, the patient gained 20/60 vision in LE with attached retina under silicone oil. RRD is a potential complication following FLACS and thus frequent follow-ups are required for high-risk patients after FLACS.
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Affiliation(s)
- Subhendu Kumar Boral
- Department of Vitreoretina, Disha Eye Hospitals Pvt Ltd, Kolkata, West Bengal, India,Address for correspondence: Dr. Subhendu Kumar Boral, Department of Vitreoretina, Disha Eye Hospitals Pvt Ltd, 88 (63A) Ghosh Para Road, Barrackpore, Kolkata - 700 120, West Bengal, India. E-mail:
| | - Deepak Agarwal
- Department of Vitreoretina, Disha Eye Hospitals Pvt Ltd, Kolkata, West Bengal, India
| | - Ayan Mohanta
- Department of Cataract and Refractive Surgery, Disha Eye Hospitals Pvt Ltd, Kolkata, West Bengal, India
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Mirzajani H, Abbasiasl T, Mirlou F, Istif E, Bathaei MJ, Dağ Ç, Deyneli O, Yazıcı D, Beker L. An ultra-compact and wireless tag for battery-free sweat glucose monitoring. Biosens Bioelectron 2022; 213:114450. [PMID: 35688025 DOI: 10.1016/j.bios.2022.114450] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/29/2022] [Accepted: 05/31/2022] [Indexed: 11/02/2022]
Abstract
Glucose monitoring before, during, and after exercise is essential for people with diabetes as exercise increases the risk of activity-induced hyper- and hypo-glycemic events. The situation is even more challenging for athletes with diabetes as they have impaired metabolic control compared to sedentary individuals. In this regard, a compact and noninvasive wearable glucose monitoring device that can be easily worn is critical to enabling glucose monitoring. This report presents an ultra-compact glucose tag with a footprint and weight of 1.2 cm2 and 0.13 g, respectively, for sweat analysis. The device comprises a near field communication (NFC) chip, antenna, electrochemical sensor, and microfluidic channels implemented in different material layers. The device has a flexible and conformal structure and can be easily attached to different body parts. The battery-less operation of the device was enabled by NFC-based wireless power transmission and the compact antenna. Femtosecond laser ablation was employed to fabricate a highly compact and flexible NFC antenna. The proposed device demonstrated excellent operating characteristics with a limit of detection (LOD), limit of quantification (LOQ), and sensitivity of 24 μM, 74 μM, and 1.27 μA cm-2 mM-1, respectively. The response of the proposed sensor in sweat glucose detection and quantification was validated by nuclear magnetic resonance spectroscopy (NMR). Also, the device's capability in attachment to the body, sweat collection, and glucose measurement was demonstrated through in vitro and in vivo experiments, and satisfactory results were obtained.
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Affiliation(s)
- Hadi Mirzajani
- Department of Mechanical Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Taher Abbasiasl
- Department of Mechanical Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Fariborz Mirlou
- Department of Biomedical Sciences and Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Emin Istif
- Department of Mechanical Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Mohammad Javad Bathaei
- Department of Biomedical Sciences and Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Çağdaş Dağ
- Department of Molecular Biology and Genetics, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey; Nanofabrication and Nanocharacterization Centre for Scientific and Technological Advanced Research, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey; Koç University İşBank Centre for Infectious Diseases, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey
| | - Oğuzhan Deyneli
- Division of Endocrinology, Department of Internal Medicine, School of Medicine, Koç University Hospital, Topkapı Caddesi, Zeytinburnu, Istanbul, Turkey
| | - Dilek Yazıcı
- Division of Endocrinology, Department of Internal Medicine, School of Medicine, Koç University Hospital, Topkapı Caddesi, Zeytinburnu, Istanbul, Turkey
| | - Levent Beker
- Department of Mechanical Engineering, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey; Koç University Research Center for Translational Research (KUTTAM), Rumelifeneri Yolu, Sarıyer, Istanbul, 34450, Turkey.
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Jun I, Li N, Shin J, Park J, Kim YJ, Jeon H, Choi H, Cho JG, Chan Choi B, Han HS, Song JJ. Synergistic stimulation of surface topography and biphasic electric current promotes muscle regeneration. Bioact Mater 2022; 11:118-129. [PMID: 34938917 PMCID: PMC8665271 DOI: 10.1016/j.bioactmat.2021.10.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/27/2021] [Accepted: 10/14/2021] [Indexed: 12/18/2022] Open
Abstract
Developing a universal culture platform that manipulates cell fate is one of the most important tasks in the investigation of the role of the cellular microenvironment. This study focuses on the application of topographical and electrical field stimuli to human myogenic precursor cell (hMPC) cultures to assess the influences of the adherent direction, proliferation, and differentiation, and induce preconditioning-induced therapeutic benefits. First, a topographical surface of commercially available culture dishes was achieved by femtosecond laser texturing. The detachable biphasic electrical current system was then applied to the hMPCs cultured on laser-textured culture dishes. Laser-textured topographies were remarkably effective in inducing the assembly of hMPC myotubes by enhancing the orientation of adherent hMPCs compared with flat surfaces. Furthermore, electrical field stimulation through laser-textured topographies was found to promote the expression of myogenic regulatory factors compared with nonstimulated cells. As such, we successfully demonstrated that the combined stimulation of topographical and electrical cues could effectively enhance the myogenic maturation of hMPCs in a surface spatial and electrical field-dependent manner, thus providing the basis for therapeutic strategies.
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Affiliation(s)
- Indong Jun
- Environmental Safety Group, Korea Institute of Science & Technology Europe (KIST-EUROPE), Saarbrücken, 66123, Germany
| | - Na Li
- Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Jaehee Shin
- Department of Medical Sciences, Graduate School of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Jaeho Park
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science & Technology (KIST), Seoul, 02792, Republic of Korea
| | - Young Jun Kim
- Environmental Safety Group, Korea Institute of Science & Technology Europe (KIST-EUROPE), Saarbrücken, 66123, Germany
| | - Hojeong Jeon
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science & Technology (KIST), Seoul, 02792, Republic of Korea
| | - Hyuk Choi
- Department of Medical Sciences, Graduate School of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Jae-Gu Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Byoung Chan Choi
- Laser Surface Texturing Group, AYECLUS, Gyeonggi-do, 14255, Republic of Korea
| | - Hyung-Seop Han
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science & Technology (KIST), Seoul, 02792, Republic of Korea
| | - Jae-Jun Song
- Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, 02841, Republic of Korea
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Li P, Liu S, Chen X, Geng C, Wu X. Spintronic terahertz emission with manipulated polarization (STEMP). Front Optoelectron 2022; 15:12. [PMID: 36637604 PMCID: PMC9756272 DOI: 10.1007/s12200-022-00011-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 01/11/2022] [Indexed: 06/17/2023]
Abstract
Highly efficient generation and arbitrary manipulation of spin-polarized terahertz (THz) radiation will enable chiral lightwave driven quantum nonequilibrium state regulation, induce new electronic structures, consequently provide a powerful experimental tool for investigation of nonlinear THz optics and extreme THz science and applications. THz circular dichromic spectroscopy, ultrafast electron bunch manipulation, as well as THz imaging, sensing, and telecommunication, also need chiral THz waves. Here we review optical generation of circularly-polarized THz radiation but focus on recently emerged polarization tunable spintronic THz emission techniques, which possess many advantages of ultra-broadband, high efficiency, low cost, easy for integration and so on. We believe that chiral THz sources based on the combination of electron spin, ultrafast optical techniques and material structure engineering will accelerate the development of THz science and applications.
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Affiliation(s)
- Peiyan Li
- School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China
| | - Shaojie Liu
- School of Cyber Science and Technology, Beihang University, Beijing, 100191, China
| | - Xinhou Chen
- School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China
| | - Chunyan Geng
- School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China
| | - Xiaojun Wu
- School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China.
- School of Cyber Science and Technology, Beihang University, Beijing, 100191, China.
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
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Prudent M, Iabbaden D, Bourquard F, Reynaud S, Lefkir Y, Borroto A, Pierson JF, Garrelie F, Colombier JP. High-Density Nanowells Formation in Ultrafast Laser-Irradiated Thin Film Metallic Glass. Nanomicro Lett 2022; 14:103. [PMID: 35416497 PMCID: PMC9008105 DOI: 10.1007/s40820-022-00850-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 03/18/2022] [Indexed: 06/14/2023]
Abstract
We present an effective approach for fabricating nanowell arrays in a one-step laser process with promising applications for the storage and detection of chemical or biological elements. Biocompatible thin films of metallic glasses are manufactured with a selected composition of Zr65Cu35, known to exhibit remarkable mechanical properties and glass forming ability. Dense nanowell arrays spontaneously form in the ultrafast laser irradiation spot with dimensions down to 20 nm. The flared shape observed by transmission electron microscopy is ideal to ensure chemical or biological material immobilization into the nanowells. This also indicates that the localization of the cavitation-induced nanopores can be tuned by the density and size of the initial nanometric interstice from the columnar structure of films deposited by magnetron sputtering. In addition to the topographic functionalization, the laser-irradiated amorphous material exhibits structural changes analyzed by spectroscopic techniques at the nanoscale such as energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy. Results reveal structural changes consisting of nanocrystals of monoclinic zirconia that grow within the amorphous matrix. The mechanism is driven by local oxidation process catalyzed by extreme temperature and pressure conditions estimated by an atomistic simulation of the laser-induced nanowell formation.
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Affiliation(s)
- Mathilde Prudent
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | - Djafar Iabbaden
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | - Florent Bourquard
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | - Stéphanie Reynaud
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | - Yaya Lefkir
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | | | | | - Florence Garrelie
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France
| | - Jean-Philippe Colombier
- Univ Lyon, UJM-Saint-Etienne, CNRS, Institute of Optics Graduate School, Laboratoire Hubert Curien, UMR CNRS 5516, 42023, St-Etienne, France.
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Yin K, Wang L, Deng Q, Huang Q, Jiang J, Li G, He J. Femtosecond Laser Thermal Accumulation-Triggered Micro-/Nanostructures with Patternable and Controllable Wettability Towards Liquid Manipulating. Nanomicro Lett 2022; 14:97. [PMID: 35394233 PMCID: PMC8993985 DOI: 10.1007/s40820-022-00840-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Accepted: 03/07/2022] [Indexed: 05/03/2023]
Abstract
Versatile liquid manipulating surfaces combining patternable and controllable wettability have recently motivated considerable attention owing to their significant advantages in droplet-solid impacting behaviors, microdroplet self-removal, and liquid-liquid interface reaction applications. However, developing a facile and efficient method to fabricate these versatile surfaces remains an enormous challenge. In this paper, a strategy for the fabrication of liquid manipulating surfaces with patternable and controllable wettability on Polyimide (PI) film based on femtosecond laser thermal accumulation engineering is proposed. Because of its controllable micro-/nanostructures and chemical composition through adjusting the local thermal accumulation, the wettability of PI film can be tuned from superhydrophilicity (~ 3.6°) to superhydrophobicity (~ 151.6°). Furthermore, three diverse surfaces with patternable and heterogeneous wettability were constructed and various applications were successfully realized, including water transport, droplet arrays, and liquid wells. This work may provide a facile strategy for achieving patternable and controllable wettability efficiently and developing multifunctional liquid steering surfaces.
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Affiliation(s)
- Kai Yin
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China
- The State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, People's Republic of China
| | - Lingxiao Wang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China
| | - Qinwen Deng
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China
| | - Qiaoqiao Huang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China
| | - Jie Jiang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China.
| | - Guoqiang Li
- Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China.
| | - Jun He
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China.
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Hashemian SJ, Abdolalizadeh P, Ghiasian L, Aghaei H, Hadavandkhani A, Semnani FN, Jafari ME, Hashemian SM, Hashemian MS. Outcomes of a Single-Segment Intrastromal Corneal Ring in Early Keratoconus and Early Pellucid Marginal Degeneration. Int Ophthalmol 2022; 42:2987-2996. [PMID: 35389172 DOI: 10.1007/s10792-022-02284-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 03/12/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE To determine the effect of a single-segment intrastromal corneal ring segment (ICRS; Intacs SK) on early keratoconus (KCN) and pellucid marginal degeneration (PMD). METHODS It is a prospective interventional study. One hundred twenty-four eyes (99 patients) with KCN and 36 eyes (26 patients) with PMD at early stage (the maximum keratometric reading less than 55 diopters) were included to ICRS implantation using femtosecond laser at a tertiary university-based hospital and a private outpatient center. The uncorrected distance and spectacle-corrected visual acuity (UDVA and SCDVA), manifest spherical and cylindrical refractions, and keratometry indices were measured preoperatively and postoperatively, 1 week, 2 and 6 months. RESULTS One week after surgery, significant improvements were observed in UDVA, SCDVA, cylinder and keratometry readings of both KCN and PMD groups (all P < 0.05) with no significant changes afterward. No significant change occurred in the sphere refraction of PMD group (P = 0.10) in contrast to KCN group (P < 0.001). Corneal irregularity of KCN group in central 3 and 5 mm zones increased at 1 week (both P < 0.001) and then started to decrease up to 6 months. However, the corneal irregularity of PMD group had significant reduction only at 1 week in 5-mm zone (P = 0.02) and 2 months in 3-mm zone (P = 0.01) postoperatively. The final efficacy indexes were 1.44 ± 0.71 and 0.87 ± 0.40 in KCN and PMD groups, respectively. CONCLUSION Visual acuity, refractive errors and keratometry values have been improved after one-segment Intacs SK implantation in early KCN and PMD patients.
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Affiliation(s)
- Seyed Javad Hashemian
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Parya Abdolalizadeh
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Leila Ghiasian
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Hossein Aghaei
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Hadavandkhani
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Nadjafi Semnani
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mohammad Ebrahim Jafari
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | | | - Mahsa Sadat Hashemian
- Eye Research Center, Eye Department, The Five Senses health Institute, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
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Gerten G, Oberheide U, Thiée P. Clear Cornea Femto DALK: a novel technique for performing deep anterior lamellar keratoplasty. Graefes Arch Clin Exp Ophthalmol 2022. [PMID: 35380269 DOI: 10.1007/s00417-022-05582-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/26/2022] [Accepted: 01/28/2022] [Indexed: 11/04/2022] Open
Abstract
PURPOSE A new femtosecond laser assisted deep anterior lamellar keratoplasty technique (Clear Cornea Femto DALK or CCF DALK) can be performed with less technical challenges compared to conventional procedures. This paper reports on a preliminary case series to evaluate the technique. METHOD First, through a clear cornea approach, Descemet's membrane (DM) is completely separated from posterior stroma by injection of balanced salt solution/viscoelastic substance through a special cannula inserted into the deep stroma and positioned right above the DM without perforating. The injection creates a liquid chamber that detaches the DM while preserving a reasonably transparent corneal stroma. Afterwards, a complete posterior/anterior trephination of the stroma, from the liquid chamber to the epithelium, is done using a femtosecond laser system under optical coherence tomography control. RESULTS This technique was successfully performed in a preliminary series of 10 eyes/10 patients. All patients had the DM completely bared and kept their own endothelial cell population with minimal cell loss (< 15%) after 6 months. Postoperative interface reaction was minimal, and no immune reactions were observed thus far. CONCLUSION Clear Cornea Femto DALK is a promising alternative to previous Femto DALK procedures with good acceptance of the tissue seen to date.
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Tian X, He H. Activation of Mitochondrial Ca 2+ Oscillation and Mitophagy Induction by Femtosecond Laser Photostimulation. Bio Protoc 2022; 12:e4369. [PMID: 35991968 PMCID: PMC9382407 DOI: 10.21769/bioprotoc.4369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 11/22/2021] [Accepted: 02/14/2022] [Indexed: 12/29/2022] Open
Abstract
Ultra-precise stimulation solely to individual mitochondria, without any influence to the whole cell, is quite difficult by traditional biochemical reagents. In mitophagy research, the mitochondria and even the whole cell usually suffer irreversible and great damage caused by treatment with potent chemicals. In this protocol, we present the technical procedures of our developed noninvasive ultra- precise laser stimulation (UPLaS) technology, which introduces precise stimulation to individual mitochondria, to excite mitochondrial Ca 2+ (mitoCa 2+ ) oscillations, with little perturbation to mitochondrial membrane potential (MMP), or mitochondrial reactive oxygen species (mitoROS). The mitoCa 2+ oscillation by UPLaS was able to initiate the PINK1/Parkin pathway for mitophagy. This protocol has good potential to benefit researches on mitophagy and mitochondrial diseases. Graphic abstract: Figure 1.Flowchart of the UPLaS technology.The femtosecond laser (1030 nm, 1 MHz, 220 fs) can stimulate individual mitochondria (1 μm 2 ) for a short period (0.1 s), whereas confocal microscopy (CM) provides continuous cell imaging to monitor molecular dynamics in real time, before and after UPLaS.
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Affiliation(s)
- Xiaoying Tian
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Hao He
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China,*For correspondence:
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Liang C, Tian Y, Zou X, Hu Y, Zhou H, Yang L, Wang H. Improve endothelialization of metallic cardiovascular stent via femtosecond laser induced micro/nanostructure dependent cells proliferation and drug delivery control. Colloids Surf B Biointerfaces 2022; 212:112376. [PMID: 35114434 DOI: 10.1016/j.colsurfb.2022.112376] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/11/2022] [Accepted: 01/25/2022] [Indexed: 11/21/2022]
Abstract
Regarding restenosis occurrence risk after metallic stent deployment in artery, stents with vascular smooth muscle cells antiproliferative agents sustained released from poly(lactic-co-glycolic acid) (PLGA) coating and endothelial cells proliferation favored surface textures were both attempted for endothelialization enhancement. In order to explore the interaction between the surface texture and performance of drug loaded PLGA coating, femtosecond laser surface treatment was used to change the surface characteristics of 316L stainless steel. Two different surface patterns in form of stripe (FSL100) and isolated island-like structure (FSL800) were firstly generated by femtosecond laser processing with 100 and 800 mW energy, then Rapamycin loaded PLGA coating was further deposited to polished and femtosecond laser processed 316L surfaces via a dip-coating method. The subsequent drug loading capacity and release profile studies confirmed the roles of surface texture. Morphological transition characteristics of the PLGA coating on the FLS100 sample indicate that the coating has integrity during degradation compared to the polished one. Finally, rapamycin eluting FLS100 stent was deployed to iliac arteries of New Zealand White rabbits with vascular plaques to demonstrate its endothelialization potential and resistance to restenosis.
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Mohamed WR, Mahmoud N, Abdel Samad F, Ahmed E, Hamblin MR, Mohamed T. Rapid monitoring of serum albumin as a biomarker of liver and kidney diseases using femtosecond laser-induced fluorescence. Spectrochim Acta A Mol Biomol Spectrosc 2022; 268:120646. [PMID: 34840055 DOI: 10.1016/j.saa.2021.120646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 10/21/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
Albumin is the most abundant serum protein that transports hormones, free fatty acids, bilirubin, various ions, and drugs. The current study investigated the potential application of laser-induced fluorescence (LIF) in clinical analysis of human serum albumin (HSA) as a biomarker of liver and kidney disease. The excitation wavelength and HSA concentrations were systematically varied, and the LIF spectrum was recorded, in order to construct a standard calibration curve. Over a wide range of excitation wavelengths, excitation at 350 nm showedthe maximum fluorescence emission centered at 500 nm. We compared the determination of certain concentrations of HSA using both LIF and conventional laboratory assays. The LIF technique proved to be highly accurate and efficient. It may be concluded that femtosecond LIF provides a new, easy, very sensitive, precise, and direct method of detecting albumin in various biological samples.
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Affiliation(s)
- Wafaa R Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Nora Mahmoud
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Fatma Abdel Samad
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Esraa Ahmed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Michael R Hamblin
- Laser Research Centre, Faculty of Health Science, University of Johannesburg, Doornfontein 2028, South Africa
| | - Tarek Mohamed
- Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef 62511, Egypt; Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, Indonesia.
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Kloft LJ, Hill JE, Leang RS, Gwon AE, Huang LC. Preclinical Safety and Efficacy Assessments for Novel Femtosecond Lasers in Corneal Refractive Surgery. Ophthalmol Ther 2022; 11:521-532. [PMID: 35122607 PMCID: PMC8927562 DOI: 10.1007/s40123-022-00465-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/11/2022] [Indexed: 11/24/2022] Open
Abstract
Preclinical safety requirements and test methods have been standardized over time to guide medical device developers in the path needed to manufacture safe devices and achieve regulatory approval. Today, femtosecond lasers are commonly used in cataract and refractive surgeries. Currently, an industry standard to guide developers in preclinical testing of ophthalmic lasers does not exist. Consequently, the data presented in regulatory submissions may vary between manufacturers, making the regulatory review process more ambiguous. Here, the authors present a comprehensive discussion of preclinical test methods applied to the evaluation of an ophthalmic laser. We include in vitro and ex vivo models, as well as an in vivo rabbit model subject to corneal refractive treatments, for consideration in a preclinical safety evaluation plan. Scientific rationale to support the ocular endpoints of evaluation in the rabbit model to demonstrate safety is also presented and discussed.
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Affiliation(s)
- Lisa J Kloft
- Research & Development, Johnson & Johnson Surgical Vision, Inc., 1700 East Saint Andrew Place, Santa Ana, CA, 92705, USA
| | - James E Hill
- Research & Development, Johnson & Johnson Surgical Vision, Inc., 1700 East Saint Andrew Place, Santa Ana, CA, 92705, USA
| | - Ronika S Leang
- Research & Development, Johnson & Johnson Surgical Vision, Inc., 1700 East Saint Andrew Place, Santa Ana, CA, 92705, USA
| | - Arlene E Gwon
- Gavin Herbert Eye Institute, University of California, Irvine, Irvine, CA, USA
| | - Ling C Huang
- Research & Development, Johnson & Johnson Surgical Vision, Inc., 1700 East Saint Andrew Place, Santa Ana, CA, 92705, USA.
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Abstract
Graphene quantum dots (GQDs) have emerged as a promising new class of environmentally friendly quantum dots with unique properties. However, the limitations of synthesis and patterning methods have hindered GQDs from displaying their true potentials to date. Here, we demonstrate the simultaneous synthesis and patterning of GQDs for the first time inside a transparent polymer, polydimethylsiloxane (PDMS), using femtosecond laser pulses. By focusing and scanning femtosecond laser pulses, arbitrary fluorescent patterns such as a concealed fluorescent QR code can be readily patterned without pre- and/or post-treatment. In addition, the proposed method is applied to the fabrication of fluorescent three-dimensional structures inside a transparent polymer via multiphoton interactions. The proposed method realizes single-stepped and spatially selective patterning of GQDs directly inside polymer substrates and expands the possibilities of GQDs for applications in novel flexible three-dimensional optoelectrical devices.
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