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Zaca-Morán R, Mitre-Martínez DG, Castillo-Mixcóalt J, Zaca-Morán P, Ramos-García R, Ramírez-San-Juan JC, Morán-Raya C, Padilla-Martínez JP. 3D printed needleless injector based on thermocavitation: analysis of impact and penetration depth in skin phantoms in a repetitive regime. Drug Deliv Transl Res 2024:10.1007/s13346-024-01639-1. [PMID: 38831200 DOI: 10.1007/s13346-024-01639-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/23/2024] [Indexed: 06/05/2024]
Abstract
A global issue that requires attention is the duality between the shortage of needles for regular vaccination campaigns and the exponential increase in syringe and needle waste from such campaigns, which has been exacerbated by the COVID-19 pandemic. In response to this problem, this study presents a 3D printed needleless injector based on thermocavitation. The work focused on investigating the interaction of the resulting liquid jets with skin phantoms at different concentrations (1-2%), emphasizing their impact and penetration depth in a repetitive regime. The injector was designed and fabricated from a semi-transparent polymer using a high-resolution 3D printer, allowing the ejection of liquid jets with velocities up to ~ 73 m/s. The impact of these jets on skin phantoms was evaluated using a high-speed camera. After 6 consecutive liquid jets (1% concentration), a maximum penetration depth of ~ 2.5 mm was achieved, delivering approximately 4.7 µL. For the highest concentration (2.0%) and the same number of shots, the penetration depth was reduced to ~ 0.6 mm with a delivered volume of ~ 0.7 µL. An important finding of this study is that the liquid jet with the highest pressure does not cause the maximum penetration depth, but is the result of a series of successive shots. In addition, the velocity and shape of the ejected jet are determined by the amount of solution and the meniscus formed inside the injector. These findings advance the development of precise and efficient thermocavitation-based injectors with broad potential applications in medical and pharmaceutical fields.
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Affiliation(s)
- Rafael Zaca-Morán
- Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla, Puebla, 72050, México
- División de Posgrado, Universidad Politécnica de Tulancingo, Tulancingo de Bravo, Hidalgo, 43629, México
| | | | - Juan Castillo-Mixcóalt
- Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla, Puebla, 72050, México
| | - Placido Zaca-Morán
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, 72050, México
| | - Rubén Ramos-García
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de óptica, Tonantzintla, Puebla, 72840, México
| | - Julio César Ramírez-San-Juan
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de óptica, Tonantzintla, Puebla, 72840, México
| | - Carolina Morán-Raya
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, 72050, México
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Wang H, Xie Y, Chen Y, Zhao H, Lv X, Zhang Z, Li G, Pan J, Wang J, Liu Z. Transdermal Delivery of Photosensitizer-Catalase Conjugate by Fluorinated Polyethylenimine for Enhanced Topical Photodynamic Therapy of Bacterial Infections. Adv Healthc Mater 2023; 12:e2300848. [PMID: 37178381 DOI: 10.1002/adhm.202300848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Pathogenic bacteria induce subcutaneous infections pose serious threats to global public health. Recently, photodynamic therapy (PDT) has been proposed as a non-invasive approach for anti-microbial treatment without the risk to induce drug resistance. However, due to the hypoxic environment of most anaerobiont-infected sites, the therapeutic efficacy of oxygen consuming PDT has been limited. Herein, a transdermal delivery system is reported to allow effective delivery of photosensitizers into infected skin for PDT treatment of skin infections by bacteria. Considering the overproduction of hydrogen peroxide (H2 O2 ) in the abscess area, catalase (CAT), an enzyme that triggers H2 O2 decomposition to generate O2 , is conjugated with chlorine e6 (Ce6) to form a photosensitizer conjugate (Ce6-CAT) as an enhanced PDT agent against Staphylococcus Aureus. After screening a series of fluorinated low molecular weight polyethylenimine (F-PEI) with different fluorination degrees, the optimized F-PEI formulation is identified with the best transdermal delivery ability system. Upon mixing, the formed Ce6-CAT@F-PEI nanocomplex shows effective transdermal penetration after being applied to the skin surface. With light exposure of the infected skin, highly effective in vivo anti-bacterial PDT therapeutic effect with Ce6-CAT@F-PEI is observed. This work proposes a transdermal PDT therapeutic nanomedicine particularly promising for the anti-bacterial treatment of skin infections.
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Affiliation(s)
- Hairong Wang
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Yi Xie
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Yanling Chen
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - He Zhao
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Xinjing Lv
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Zimu Zhang
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Gen Li
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Jian Pan
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Jian Wang
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, Jiangsu, 215123, China
| | - Zhuang Liu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, China
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González-Sierra NE, Perez-Corte JM, Padilla-Martinez JP, Cruz-Vanegas S, Bonfadini S, Storti F, Criante L, Ramos-García R. Bubble dynamics and speed of jets for needle-free injections produced by thermocavitation. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:075004. [PMID: 37484974 PMCID: PMC10362157 DOI: 10.1117/1.jbo.28.7.075004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/11/2023] [Accepted: 06/02/2023] [Indexed: 07/25/2023]
Abstract
Significance The number of injections administered has increased dramatically worldwide due to vaccination campaigns following the COVID-19 pandemic, creating a problem of disposing of syringes and needles. Accidental needle sticks occur among medical and cleaning staff, exposing them to highly contagious diseases, such as hepatitis and human immunodeficiency virus. In addition, needle phobia may prevent adequate treatment. To overcome these problems, we propose a needle-free injector based on thermocavitation. Aim Experimentally study the dynamics of vapor bubbles produced by thermocavitation inside a fully buried 3D fused silica chamber and the resulting high-speed jets emerging through a small nozzle made at the top of it. The injected volume can range from ∼ 0.1 to 2 μ L per shot. We also demonstrate that these jets have the ability to penetrate agar skin phantoms and ex-vivo porcine skin. Approach Through the use of a high-speed camera, the dynamics of liquid jets ejected from a microfluidic device were studied. Thermocavitation bubbles are generated by a continuous wave laser (1064 nm). The 3D chamber was fabricated by ultra-short pulse laser-assisted chemical etching. Penetration tests are conducted using agar gels (1%, 1.25%, 1.5%, 1.75%, and 2% concentrations) and porcine tissue as a model for human skin. Result High-speed camera video analysis showed that the average maximum bubble wall speed is about 10 to 25 m/s for almost any combination of pump laser parameters; however, a clever design of the chamber and nozzle enables one to obtain jets with an average speed of ∼ 70 m / s . The expelled volume per shot (0.1 to 2 μ l ) can be controlled by the pump laser intensity. Our injector can deliver up to 20 shots before chamber refill. Penetration of jets into agar of different concentrations and ex-vivo porcine skin is demonstrated. Conclusions The needle-free injectors based on thermocavitation may hold promise for commercial development, due to their cost and compactness.
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Affiliation(s)
| | - José Manuel Perez-Corte
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
| | | | - Samuel Cruz-Vanegas
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
| | - Silvio Bonfadini
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
| | - Filippo Storti
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
- Politecnico di Milano, Department of Physics, Milano, Italy
| | - Luigino Criante
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
| | - Rubén Ramos-García
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
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Yu CC, Shah A, Amiri N, Marcus C, Nayeem MOG, Bhayadia AK, Karami A, Dagdeviren C. A Conformable Ultrasound Patch for Cavitation-Enhanced Transdermal Cosmeceutical Delivery. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2300066. [PMID: 36934314 DOI: 10.1002/adma.202300066] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 03/06/2023] [Indexed: 06/09/2023]
Abstract
Increased consumer interest in healthy-looking skin demands a safe and effective method to increase transdermal absorption of innovative therapeutic cosmeceuticals. However, permeation of small-molecule drugs is limited by the innate barrier function of the stratum corneum. Here, a conformable ultrasound patch (cUSP) that enhances transdermal transport of niacinamide by inducing intermediate-frequency sonophoresis in the fluid coupling medium between the patch and the skin is reported. The cUSP consists of piezoelectric transducers embedded in a soft elastomer to create localized cavitation pockets (0.8 cm2 , 1 mm deep) over larger areas of conformal contact (20 cm2 ). Multiphysics simulation models, acoustic spectrum analysis, and high-speed videography are used to characterize transducer deflection, acoustic pressure fields, and resulting cavitation bubble dynamics in the coupling medium. The final system demonstrates a 26.2-fold enhancement in niacinamide transport in a porcine model in vitro with a 10 min ultrasound application, demonstrating the suitability of the device for short-exposure, large-area application of sonophoresis for patients and consumers suffering from skin conditions and premature skin aging.
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Affiliation(s)
- Chia-Chen Yu
- Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Aastha Shah
- Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Nikta Amiri
- Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY, 14260, USA
| | - Colin Marcus
- Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | | | - Amit Kumar Bhayadia
- Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY, 14260, USA
| | - Amin Karami
- Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY, 14260, USA
| | - Canan Dagdeviren
- Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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van der Ven DL, Morrone D, Quetzeri-Santiago MA, Fernandez Rivas D. Microfluidic jet impact: Spreading, splashing, soft substrate deformation and injection. J Colloid Interface Sci 2023; 636:549-558. [PMID: 36652830 DOI: 10.1016/j.jcis.2023.01.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023]
Abstract
HYPOTHESIS Needle-free injections using microfluidic jets could be optimized by reducing splashing and controlling injection depth. However, this is impeded by an incomplete understanding on how jet characteristics influence impact outcome. We hypothesise that exploring the relation between microfluidic jet characteristics and substrate shear modulus on impact behavior will assist in predicting and giving insights on the impact outcome on skin and injection endpoints. EXPERIMENTS To do so, a setup using microfluidic chips, at varying laser powers and stand-off distances, was used to create thermocavitation generated microfluidic jets with ranging characteristics (velocity: 7-77 m/s, diameter: 35-120 μm, Weber-number: 40-4000), which were impacted on substrates with different shear modulus. FINDINGS Seven impact regimes were found, depending on jet Weber-number and substrate shear modulus, and we identified three thresholds: i) spreading/splashing threshold, ii) dimple formation threshold, and iii) plastic/elastic deformation threshold. The regimes show similarity to skin impact, although the opacity of skin complicated determining the threshold values. Additionally, we found that jet velocity has a higher predictive value for injection depth compared to the Weber-number, and consequently, the jet-diameter. Our findings provide fundamental knowledge on the interaction between microfluidic jets and substrates, and are relevant for optimizing needle-free injections.
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Affiliation(s)
- Diana L van der Ven
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands
| | - Davide Morrone
- Nanovea SRL, Via Balegno 1, 10040 Rivalta di Torino, Italy
| | - Miguel A Quetzeri-Santiago
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands.
| | - David Fernandez Rivas
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands.
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Yi L, Gao L, Lv L, Zhang B, Chen F, Yang F, Yan W, Jiang L, Li N, Lao Y, Lu J, Huang X. Therapeutic efficacy of metronidazole by needle-free jet injection combined with blue light therapy in Moderate-to-Severe facial acne vulgaris. J Cosmet Dermatol 2023; 22:569-576. [PMID: 36208057 DOI: 10.1111/jocd.15442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 10/03/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Acne vulgaris is one of the most common dermatological diseases. Some topical treatments for acne used in combination, such as blue light and topical antibiotics (such as metronidazole) by needle-free jet injection (NFJI), are becoming prevalent in clinical practice, but the efficacy remains uncertain. METHODS In order to investigate the effect of blue light combined with metronidazole by NFJI in the treatment of acne, the 251 enrolled patients were randomly assigned into the blue light group, metronidazole (MNZ) group, and MNZ + blue light group, and then received 6-weeks' treatment. A variety of objective and subjective methods such as clinical pictures, skin barrier physiological parameters (including trans-epidermal water loss (TEWL), stratum corneum hydration, facail surface sebum, erythema and pigmentation), the Investigator Global Assessment score, acne lesion count assessment, Patients' Self-Assessment, and VAS score were used to evaluate the efficacy and side effects of the treatments. RESULTS Compared to the baseline, the MNZ + blue light group showed significant improvement in acne lesion count reduction, TEWL, straum corneum hydration, facial surface sebum and erythema (p < 0.05). The MNZ + blue light group showed significant differences compared with the MNZ group and blue light group in terms of acne lesion count reduction and erythema (p < 0.05) Compared to the MNZ group, the MNZ + blue light group demonstrated significant improvement in TEWL and sebum (p < 0.05). While compared to the blue light group, the MNZ + blue light group showed significant improvement in hydration (p < 0.05). There was no statistically significant difference among the three groups in pigmentation (p > 0.05). CONCLUSION The combination of MNZ by NFJI and blue light has a synergistic effect and can relieve acne skin lesion within 6 weeks in the treatment of moderate and moderate-to-severe facial acne vulgaris, meanwhile, this method has a good safety.
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Affiliation(s)
- Lu Yi
- Department of Dermatology and Venereology/Cosmetic Dermatology, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Lihua Gao
- Departments of Dermatology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Lv Lv
- Department of Breast and Thyroid surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Bo Zhang
- Departments of Stomatology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Fangru Chen
- Department of Breast and Thyroid surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Fengyuan Yang
- Department of Dermatology and Venereology/Cosmetic Dermatology, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Wenjie Yan
- Department of Dermatology and Venereology/Cosmetic Dermatology, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Lijun Jiang
- Department of Breast and Thyroid surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Nianzhen Li
- Department of Breast and Thyroid surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Yuanqing Lao
- Department of Dermatology and Venereology/Cosmetic Dermatology, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Jianyun Lu
- Departments of Dermatology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Xi Huang
- Department of Dermatology and Venereology/Cosmetic Dermatology, Affiliated Hospital of Guilin Medical University, Guilin, China
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Bourgeois P, Roman MM, Schweicher J, Lavoisier P, Maquet P, Karler C, Lizewski M, Fouarge A, Cuylits N, del Marmol V, Leduc O. Lymphatic Alterations Under Tattoos: Preliminary Reports of One Observational Study. CLINICAL, COSMETIC AND INVESTIGATIONAL DERMATOLOGY 2023; 16:257-265. [PMID: 36733347 PMCID: PMC9888301 DOI: 10.2147/ccid.s393038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 12/22/2022] [Indexed: 01/28/2023]
Abstract
Background The number of people within the European population having at least one tattoo has increased notably and with it the number of tattoo-associated clinical complications. The injected inks are known to be removed by the lymphatic vessels and can be found in the draining lymph nodes. Aim of the Study To report our observations on the lymphatic drainages seen under tattoos using near infrared fluorescence imaging of these lymphatic vessels after the injection of indocyanine green. Material and Methods Indocyanine green was injected intradermally at the basis of the 20 tattooed area(s) in 19 subjects (nine women and ten men; mean age = 28.6). Ten subjects had only black tattoos (six upper limbs and four lower limbs), five (two upper limbs and three lower limbs) black and white tattoos and five multi-colored tattooed limbs (four lower limbs and one upper limb). Results The imaging exams revealed alterations in eight individuals, seven of whom had tattoos on their lower limbs. Furthermore, the imaging results showed that the abnormalities might be related to the tattooed limb, the tattoo extent and colour. Conclusion Alterations of the cutaneous lymphatic channels are frequently observed under tattooed territories. Their causal factors should be more precisely studied in future works and these lymphatic alterations should be considered in tattooed patients when using similar imaging techniques for therapeutic and surgical assessments.
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Affiliation(s)
- Pierre Bourgeois
- Service of Dermatology, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium,Services of Nuclear Medicine, HIS-IZZ Hospitals, Université Libre de Bruxelles, Brussels, Belgium,Multi-Disciplinary Clinic of Lymphology, Institute Jules Bordet, Université Libre de Bruxelles, Brussels, Belgium,Service of Vascular Surgery, HIS-IZZ Hospitals, Université Libre de Bruxelles, Brussels, Belgium,Correspondence: Pierre Bourgeois, Department of Dermatology, University Hospital Erasme, Université Libre de Bruxelles, 808, route de Lennik, Brussels, 1070, Belgium, Tel +32495201906, Email
| | - Mirela Mariana Roman
- Department of Mammo-Pelvic Surgery, Institute Jules Bordet, Université Libre de Bruxelles, Brussels, Belgium
| | - Justine Schweicher
- Unité de lympho-phlébologie, Haute Ecole Bruxelles-Brabant, Haute Ecole Robert Schuman, Brussels, Belgium
| | - Pauline Lavoisier
- Unité de lympho-phlébologie, Haute Ecole Bruxelles-Brabant, Haute Ecole Robert Schuman, Brussels, Belgium
| | - Philippe Maquet
- Unité de lympho-phlébologie, Haute Ecole Bruxelles-Brabant, Haute Ecole Robert Schuman, Brussels, Belgium
| | - Clarence Karler
- Department of Anesthesia-Algologia, Hospital Moliere, Université Libre de Bruxelles, Brussels, Belgium
| | - Mateusz Lizewski
- Service of Plastic, Reconstructive and Aesthetic Surgery, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Alessandro Fouarge
- Service of Plastic, Reconstructive and Aesthetic Surgery, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Nicolas Cuylits
- Service of Plastic, Reconstructive and Aesthetic Surgery, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Véronique del Marmol
- Service of Dermatology, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Olivier Leduc
- Unité de lympho-phlébologie, Haute Ecole Bruxelles-Brabant, Haute Ecole Robert Schuman, Brussels, Belgium
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8
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Rosselló JM, Ohl CD. Bullet jet as a tool for soft matter piercing and needle-free liquid injection. BIOMEDICAL OPTICS EXPRESS 2022; 13:5202-5211. [PMID: 36425620 PMCID: PMC9664874 DOI: 10.1364/boe.469486] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/05/2022] [Accepted: 08/17/2022] [Indexed: 05/30/2023]
Abstract
The collapse of a laser-induced vapor bubble near a solid boundary usually ends in a liquid jet. When the boundary is from a soft material the jetting may pierce the liquid-solid interface and result in the injection of liquid into it. A particular impulsive jet flow can be generated when a laser pulse is focused just below the free surface of a thin liquid layer covering a gelatin sample used as a surrogate of biological tissue. Here, a downwards jet forms from a liquid splash at the free surface and then penetrates through the liquid layer into the soft boundary. In the present manuscript we report on the use of this novel jet, termed "bullet" jet, to pierce soft materials and we explore its potential to become an optical needle-free injection platform. The dynamics and depth of the injection is studied as a function of the elasticity of the solid and the liquid properties. Injections of up to 4 mm deep into 4 %w/w gelatin within 0.5 ms are observed. The advantages of the bullet jet over other kinds of impulsively generated jets with lasers are discussed.
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9
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Lawal I, Rohilla P, Marston J. Visualization of drug delivery via tattooing: effect of needle reciprocating frequency and fluid properties. J Vis (Tokyo) 2022. [DOI: 10.1007/s12650-021-00816-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Byrne J, Huang HW, McRae JC, Babaee S, Soltani A, Becker SL, Traverso G. Devices for drug delivery in the gastrointestinal tract: A review of systems physically interacting with the mucosa for enhanced delivery. Adv Drug Deliv Rev 2021; 177:113926. [PMID: 34403749 DOI: 10.1016/j.addr.2021.113926] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 07/14/2021] [Accepted: 08/09/2021] [Indexed: 12/14/2022]
Abstract
The delivery of macromolecules via the gastrointestinal (GI) tract remains a significant challenge. A variety of technologies using physical modes of drug delivery have been developed and investigated to overcome the epithelial cell layer of the GI tract for local and systemic delivery. These technologies include direct injection, jetting, ultrasound, and iontophoresis, which have been largely adapted from transdermal drug delivery. Direct injection of agents using needles through endoscopy has been used clinically for over a century. Jetting, a needle-less method of drug delivery where a high-speed stream of fluid medication penetrates tissue, has been evaluated pre-clinically for delivery of agents into the buccal mucosa. Ultrasound has been shown to be beneficial in enhancing delivery of macromolecules, including nucleic acids, in pre-clinical animal models. The application of an electric field gradient to drive drugs into tissues through the technique of iontophoresis has been shown to deliver highly toxic chemotherapies into GI tissues. Here in, we provide an in-depth overview of these physical modes of drug delivery in the GI tract and their clinical and preclinical uses.
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Affiliation(s)
- James Byrne
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA; Harvard Radiation Oncology Program, Boston, MA 02114, USA; Department of Radiation Oncology, University of Iowa, Iowa City, IA 52242, USA; Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52240, USA
| | - Hen-Wei Huang
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - James C McRae
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Sahab Babaee
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Amin Soltani
- Division of Gastroenterology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Sarah L Becker
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Giovanni Traverso
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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11
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Sallam MA, Prakash S, Kumbhojkar N, Shields CW, Mitragotri S. Formulation-based approaches for dermal delivery of vaccines and therapeutic nucleic acids: Recent advances and future perspectives. Bioeng Transl Med 2021; 6:e10215. [PMID: 34589595 PMCID: PMC8459604 DOI: 10.1002/btm2.10215] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/21/2021] [Accepted: 03/01/2021] [Indexed: 12/31/2022] Open
Abstract
A growing variety of biological macromolecules are in development for use as active ingredients in topical therapies and vaccines. Dermal delivery of biomacromolecules offers several advantages compared to other delivery methods, including improved targetability, reduced systemic toxicity, and decreased degradation of drugs. However, this route of delivery is hampered by the barrier function of the skin. Recently, a large body of research has been directed toward improving the delivery of macromolecules to the skin, ranging from nucleic acids (NAs) to antigens, using noninvasive means. In this review, we discuss the latest formulation-based efforts to deliver antigens and NAs for vaccination and treatment of skin diseases. We provide a perspective of their advantages, limitations, and potential for clinical translation. The delivery platforms discussed in this review may provide formulation scientists and clinicians with a better vision of the alternatives for dermal delivery of biomacromolecules, which may facilitate the development of new patient-friendly prophylactic and therapeutic medicines.
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Affiliation(s)
- Marwa A. Sallam
- John A. Paulson School of Engineering and Applied Sciences, Wyss Institute of Biologically Inspired Engineering, Harvard UniversityCambridgeMassachusettsUSA
- Present address:
Department of Industrial PharmacyFaculty of Pharmacy, Alexandria UniversityEgypt
| | - Supriya Prakash
- John A. Paulson School of Engineering and Applied Sciences, Wyss Institute of Biologically Inspired Engineering, Harvard UniversityCambridgeMassachusettsUSA
| | - Ninad Kumbhojkar
- John A. Paulson School of Engineering and Applied Sciences, Wyss Institute of Biologically Inspired Engineering, Harvard UniversityCambridgeMassachusettsUSA
| | - Charles Wyatt Shields
- Department of Chemical & Biological EngineeringUniversity of ColoradoBoulderColoradoUSA
| | - Samir Mitragotri
- John A. Paulson School of Engineering and Applied Sciences, Wyss Institute of Biologically Inspired Engineering, Harvard UniversityCambridgeMassachusettsUSA
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12
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Miyazaki Y, Usawa M, Kawai S, Yee J, Muto M, Tagawa Y. Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet. Sci Rep 2021; 11:14544. [PMID: 34267280 PMCID: PMC8282861 DOI: 10.1038/s41598-021-94018-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 07/01/2021] [Indexed: 12/15/2022] Open
Abstract
This study investigated the fluid-tissue interaction of needle-free injection by evaluating the dynamics of the cavity induced in body-tissue simulant and the resulting unsteady mechanical stress field. Temporal evolution of cavity shape, stress intensity field, and stress vector field during the injection of a conventional injection needle, a proposed highly focused microjet (tip diameter much smaller than capillary nozzle), and a typical non-focused microjet in gelatin were measured using a state-of-the-art high-speed polarization camera, at a frame rate up to 25,000 f.p.s. During the needle injection performed by an experienced nurse, high stress intensity lasted for an order of seconds (from beginning of needle penetration until end of withdrawal), which is much longer than the order of milliseconds during needle-free injections, causing more damage to the body tissue. The cavity induced by focused microjet resembled a funnel which had a narrow tip that penetrated deep into tissue simulant, exerting shear stress in low intensity which diffused through shear stress wave. Whereas the cavity induced by non-focused microjet rebounded elastically (quickly expanded into a sphere and shrank into a small cavity which remained), exerting compressive stress on tissue simulant in high stress intensity. By comparing the distribution of stress intensity, tip shape of the focused microjet contributed to a better performance than non-focused microjet with its ability to penetrate deep while only inducing stress at lower intensity. Dynamic mechanical interaction revealed in this research uncovered the importance of the jet shape for the development of minimally invasive medical devices.
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Affiliation(s)
- Yuta Miyazaki
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Masashi Usawa
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Shuma Kawai
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Jingzu Yee
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Masakazu Muto
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Yoshiyuki Tagawa
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan.
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13
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Karregat JJJP, Rustemeyer T, van der Bent SAS, Spiekstra SW, Thon M, Fernandez Rivas D, Gibbs S. Assessment of cytotoxicity and sensitization potential of intradermally injected tattoo inks in reconstructed human skin. Contact Dermatitis 2021; 85:324-339. [PMID: 34029376 PMCID: PMC8453820 DOI: 10.1111/cod.13908] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/03/2021] [Accepted: 05/21/2021] [Indexed: 12/25/2022]
Abstract
Background The number of people within the European population having at least one tattoo has increased notably, and with it the number of tattoo‐associated clinical complications. Despite this, safety information and testing regarding tattoo inks remain limited. Objective To assess cytotoxicity and sensitization potential of 16 tattoo inks after intradermal injection into reconstructed human skin (RHS). Methods Commercially available tattoo inks were injected intradermally into RHS (reconstructed epidermis on a fibroblast‐populated collagen hydrogel) using a permanent makeup device. RHS biopsies, tissue sections, and culture medium were assessed for cytotoxicity (thiazolyl blue tetrazolium bromide assay [MTT assay]), detrimental histological changes (haematoxylin and eosin staining), and the presence of inflammatory and sensitization cytokines (interleukin [IL]‐1α, IL‐8, IL‐18; enzyme‐linked immunosorbent assay). Results Varying degrees of reduced metabolic activity and histopathological cytotoxic effects were observed in RHS after ink injection. Five inks showed significantly reduced metabolic activity and enhanced sensitization potential compared with negative controls. Discussion Using the RHS model system, four tattoo inks were identified as highly cytotoxic and classified as potential sensitizers, suggesting that allergic contact dermatitis could emerge in individuals carrying these inks. These results indicate that an RHS‐based assessment of cytotoxicity and sensitization potential by intradermal tattoo ink injection is a useful analytical tool to determine ink‐induced deleterious effects.
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Affiliation(s)
- Joey J J P Karregat
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Academic Tattoo Clinic Amsterdam, Department of Dermatology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Thomas Rustemeyer
- Academic Tattoo Clinic Amsterdam, Department of Dermatology, Amsterdam UMC, Amsterdam, The Netherlands
| | | | - Sander W Spiekstra
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Maria Thon
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - David Fernandez Rivas
- Mesoscale Chemical Systems Group, MESA+ Institute and Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
| | - Susan Gibbs
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Department of Oral Cell Biology, Academic Centre for Dentistry (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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14
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Rowson B, Duma SM. Annals of Biomedical Engineering 2020 Reviewer Recognition. Ann Biomed Eng 2021. [DOI: 10.1007/s10439-021-02761-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Krizek J, Lavickova B, Moser C. Degradation study on molecules released from laser-based jet injector. Int J Pharm 2021; 602:120664. [PMID: 33933639 DOI: 10.1016/j.ijpharm.2021.120664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 04/16/2021] [Accepted: 04/26/2021] [Indexed: 12/16/2022]
Abstract
Development of needle-free methods to administer injectable therapeutics has been researched for a few decades. We focused our attention on a laser-based jet injection technique where the liquid-jet actuation mechanism is based on optical cavitation. This study investigates the potential damage to therapeutic molecules which are exposed to nanosecond laser pulses in the configuration of a compact laser-based jet injection device. Implementation of a pulsed laser source at 1574 nm wavelength allowed us to generate jets from pure water solutions and circumvent the need to reformulate therapeutics with absorbing dyes. We performed H1-NMR analysis on exposed samples of Lidocaine and δ-Aminolevulinic acid. We made several tests with linear and plasmid DNA to assess the structural integrity and functional potency after ejection with our device. The tests showed no significant degradation or detectable side products, which is promising for further development and eventually clinical applications.
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Affiliation(s)
- Jan Krizek
- School of Engineering, Laboratory of Applied Photonics Devices, Swiss Federal Institute of Technology in Lausanne (EPFL), Station 17, 1015 Lausanne, Switzerland.
| | - Barbora Lavickova
- School of Engineering, Laboratory of Biological Network Characterisation, Swiss Federal Institute of Technology in Lausanne (EPFL), Station 17, 1015 Lausanne, Switzerland
| | - Christophe Moser
- School of Engineering, Laboratory of Applied Photonics Devices, Swiss Federal Institute of Technology in Lausanne (EPFL), Station 17, 1015 Lausanne, Switzerland.
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16
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A Perspective on Imiquimod Microneedles for Treating Warts. Pharmaceutics 2021; 13:pharmaceutics13050607. [PMID: 33922157 PMCID: PMC8146107 DOI: 10.3390/pharmaceutics13050607] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/17/2021] [Accepted: 04/20/2021] [Indexed: 12/24/2022] Open
Abstract
Warts are a common skin problem and are caused by infection with a virus. Warts are currently mainly treated by therapies involving ablating tissue or interrupting cellular division. However, all these existing treatments are either invasive or cause skin pain and tissue destruction. Imiquimod is a synthetic compound that belongs to the imidazoquinolinone family. It has been successfully used as a topical drug to treat external anogenital warts. However, topical imiquimod cream for warts is restricted by low skin permeability, and several side effects such as itching, pain, and erosions occur most frequently following topical treatment. Microneedle technology, a minimally invasive drug delivery system, has the potential to overcome the barrier of the stratum corneum. This technique would also offer a painless treatment choice and provide personalized therapies. In the study, we loaded imiquimod within dissolving microneedles using the molding method. Gelatin was used as a structural material for microneedle formation without adding a crosslinker. To our knowledge, this is the first study of using dissolving microneedles and exploring their utilization with imiquimod for the treatment of warts. First, we added fluorescent dye and trypan blue into the microneedles to evaluate the status of drugs in the microneedles and the degradation property of microneedles made of gelatin, respectively. Here we also prove the strength of the imiquimod microneedles and study their capability to penetrate the skin. The results show no apparent differences in mechanical failure after an additional imiquimod-loaded. Besides, we provide evidence that imiquimod microneedles induce secreted embryonic alkaline phosphatase (SEAP) in the RAW 264.7 macrophages. Gelatin does not affect the imiquimod in microneedles; a similar immune response was affected by the imiquimod alone or imiquimod complexed with gelatin. Our research demonstrates a proof of concept of using imiquimod microneedles for future warts treatment.
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17
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Wang R, Bian Q, Xu Y, Xu D, Gao J. Recent advances in mechanical force-assisted transdermal delivery of macromolecular drugs. Int J Pharm 2021; 602:120598. [PMID: 33862129 DOI: 10.1016/j.ijpharm.2021.120598] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/30/2021] [Accepted: 04/08/2021] [Indexed: 11/29/2022]
Abstract
The transdermal delivery of macromolecular drugs has become one of the focused topics in pharmaceutical research since it enables highly specific and effective delivery, while avoiding the pain and needle phobia associated with injection, or incidences like drug degradation and low bioavailability of oral administration. However, the passive absorption of macromolecular drugs via skin is highly restricted by the stratum corneum owing to high molecular weight. Therefore, various strategies have been extensively developed and conducted to facilitate the transdermal delivery of macromolecular drugs, among which, mechanical force-assisted techniques occupy dominant positions. Such techniques include ultrasound, needle-free jet injection, temporary pressure and microneedles. In this review, we focus on recent transdermal enhancing strategies utilizing mechanical force, and summarize their mechanisms, advantages, limitations and clinical applications respectively.
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Affiliation(s)
- Ruxuan Wang
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qiong Bian
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yihua Xu
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Donghang Xu
- Department of Pharmacy, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310058, China.
| | - Jianqing Gao
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China; Institute of Pharmaceutics, Hangzhou Institute of Innovative Medicine, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China; Jiangsu Engineering Research Center for New-type External and Transdermal Preparations, Changzhou 213149, China.
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18
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Mercuri M, Fernandez Rivas D. Challenges and opportunities for small volumes delivery into the skin. BIOMICROFLUIDICS 2021; 15:011301. [PMID: 33532017 PMCID: PMC7826167 DOI: 10.1063/5.0030163] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Accepted: 01/09/2021] [Indexed: 05/04/2023]
Abstract
Each individual's skin has its own features, such as strength, elasticity, or permeability to drugs, which limits the effectiveness of one-size-fits-all approaches typically found in medical treatments. Therefore, understanding the transport mechanisms of substances across the skin is instrumental for the development of novel minimal invasive transdermal therapies. However, the large difference between transport timescales and length scales of disparate molecules needed for medical therapies makes it difficult to address fundamental questions. Thus, this lack of fundamental knowledge has limited the efficacy of bioengineering equipment and medical treatments. In this article, we provide an overview of the most important microfluidics-related transport phenomena through the skin and versatile tools to study them. Moreover, we provide a summary of challenges and opportunities faced by advanced transdermal delivery methods, such as needle-free jet injectors, microneedles, and tattooing, which could pave the way to the implementation of better therapies and new methods.
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Affiliation(s)
- Magalí Mercuri
- Instituto de Nanociencia y Nanotecnología (CNEA-CONICET), Av. Gral. Paz 1499, 1650 San Martín, Buenos Aires, Argentina
| | - David Fernandez Rivas
- Mesoscale Chemical Systems Group, MESA+ Institute, TechMed Centre and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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19
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Ukidve A, Cu K, Goetz M, Angsantikul P, Curreri A, Tanner EEL, Lahann J, Mitragotri S. Ionic-Liquid-Based Safe Adjuvants. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002990. [PMID: 33058352 DOI: 10.1002/adma.202002990] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 09/10/2020] [Indexed: 06/11/2023]
Abstract
Adjuvants play a critical role in the design and development of novel vaccines. Despite extensive research, only a handful of vaccine adjuvants have been approved for human use. Currently used adjuvants are mostly composed of components that are non-native to the human body, such as aluminum salt, bacterial lipids, or foreign genomic material. Here, a new ionic-liquid-based adjuvant is explored, synthesized using two metabolites of the body, choline and lactic acid (ChoLa). ChoLa distributes the antigen efficiently upon injection, maintains antigen integrity, enhances immune infiltration at the injection site, and leads to a potent immune response against the antigen. Thus, it can serve as a promising safe adjuvant platform that can help to protect against pandemics and future infectious threats.
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Affiliation(s)
- Anvay Ukidve
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Katharina Cu
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Morgan Goetz
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Pavimol Angsantikul
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Alexander Curreri
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Eden E L Tanner
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Joerg Lahann
- Department of Chemical Engineering, Materials Science and Engineering, Biomedical Engineering, and Macromolecular Science and Engineering, University of Michigan, Ann Arbor, MI, 48105, USA
| | - Samir Mitragotri
- Wyss Institute of Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
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20
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Rohilla P, Marston J. Feasibility of laser induced jets in needle free jet injections. Int J Pharm 2020; 589:119714. [DOI: 10.1016/j.ijpharm.2020.119714] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/24/2020] [Accepted: 07/28/2020] [Indexed: 11/27/2022]
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21
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Butterfield JL, Keyser SP, Dikshit KV, Kwon H, Koster MI, Bruns CJ. Solar Freckles: Long-Term Photochromic Tattoos for Intradermal Ultraviolet Radiometry. ACS NANO 2020; 14:13619-13628. [PMID: 32961057 DOI: 10.1021/acsnano.0c05723] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
While tattooable nanotechnology for in-skin sensing and communication has been a popular concept in science fiction since the 1990s, the first tattooable intradermal nanosensors have only emerged in the past few years, and none have been demonstrated in human skin. We developed a photochromic tattoo that serves as an intradermal ultraviolet (UV) radiometer that provides naked-eye feedback about UV exposure in real time. These small tattoos, or "solar freckles", comprise dermally implanted colorimetric UV sensors in the form of nanoencapsulated leuco dyes that become more blue in color with increasing UV irradiance. We demonstrate the tattoos' functionality for both quantitative and naked-eye UV sensing in porcine skin ex vivo, as well as in human skin in vivo. Solar freckles offer an alternative and complementary approach to self-monitoring UV exposure for the sake of skin cancer prevention. Activated solar freckles provide a visual reminder to protect the skin, and their color disappears rapidly upon removal of UV exposure or application of topical sunscreen. The sensors are implanted in a minimally invasive procedure that lasts only a few seconds, yet remain functional for months to years. These semipermanent tattoos provide an early proof-of-concept for long-term intradermal sensing nanomaterials that provide users with biomedically relevant information in the form of an observable color change.
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Affiliation(s)
- Jesse L Butterfield
- Paul M. Rady Department of Mechanical Engineering, University of Colorado-Boulder, Boulder, Colorado 80309, United States
| | - Sean P Keyser
- Paul M. Rady Department of Mechanical Engineering, University of Colorado-Boulder, Boulder, Colorado 80309, United States
| | - Karan V Dikshit
- Materials Science & Engineering Program, University of Colorado-Boulder, Boulder, Colorado 80309, United States
| | - Hyejin Kwon
- Paul M. Rady Department of Mechanical Engineering, University of Colorado-Boulder, Boulder, Colorado 80309, United States
| | - Maranke I Koster
- Department of Dermatology, University of Colorado-Denver, Anschutz Medical Campus, Denver, Colorado 80217, United States
| | - Carson J Bruns
- Paul M. Rady Department of Mechanical Engineering, University of Colorado-Boulder, Boulder, Colorado 80309, United States
- ATLAS Institute, University of Colorado-Boulder, Boulder, Colorado 80309, United States
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22
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Krizek J, De Goumoëns F, Delrot P, Moser C. Needle-free delivery of fluids from compact laser-based jet injector. LAB ON A CHIP 2020; 20:3784-3791. [PMID: 32902554 DOI: 10.1039/d0lc00646g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Jet injection devices have been studied and developed for transdermal drug delivery to avoid the use of needles. Due to bulky actuation mechanisms, they are limited to body areas that are easy to reach such as skin. Here, we demonstrate a thin and long liquid delivery system (e.g. flexible and 30 cm long with 1.2 mm outer diameter) compatible with minimally invasive surgical procedures. The actuation mechanism is based on optical cavitation in a capillary nozzle where a laser pulse is delivered via a multimode optical fibre. We show good controllability of the jet speed by varying the actuation laser fluence. The generated jets can successfully penetrate into a 1% agarose gel which is representative of the mechanical properties of several soft body tissues. We further observe that when the system is used in a low laser energy regime (<60 μJ), the ejection is in the form of the single droplet which is promising for fluid delivery with high volume precision or drop-on-demand inkjet printing. The jet injection system we propose has the potential to deliver heat-sensitive therapeutics as we show processing of biomolecules without altering their functionality.
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Affiliation(s)
- Jan Krizek
- School of Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), Station 17, 1015 Lausanne, Switzerland.
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