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Li P, Xu B, Zhang X, Fang D, Zhang J. Design and development of a personalized virtual reality-based training system for vascular intervention surgery. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024; 249:108142. [PMID: 38547688 DOI: 10.1016/j.cmpb.2024.108142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 02/17/2024] [Accepted: 03/20/2024] [Indexed: 04/21/2024]
Abstract
BACKGROUND AND OBJECTIVES Virtual training has emerged as an exceptionally effective approach for training healthcare practitioners in the field of vascular intervention surgery. By providing a simulated environment and blood vessel model that enables repeated practice, virtual training facilitates the acquisition of surgical skills in a safe and efficient manner for trainees. However, the current state of research in this area is characterized by limitations in the fidelity of blood vessel and guidewire models, which restricts the effectiveness of training. Additionally, existing approaches lack the necessary real-time responsiveness and precision, while the blood vessel models suffer from incompleteness and a lack of scientific rigor. METHODS To address these challenges, this paper integrates position-based dynamics (PBD) and its extensions, shape matching, and Cosserat elastic rods. By combining these approaches within a unified particle framework, accurate and realistic deformation simulation of personalized blood vessel and guidewire models is achieved, thereby enhancing the training experience. Furthermore, a multi-level progressive continuous collision detection method, leveraging spatial hashing, is proposed to improve the accuracy and efficiency of collision detection. RESULTS Our proposed blood vessel model demonstrated acceptable performance with the reduced deformation simulation response times of 7 ms, improving the real-time capability at least of 43.75 %. Experimental validation confirmed that the guidewire model proposed in this paper can dynamically adjust the density of its elastic rods to alter the degree of bending and torsion. It also exhibited a deformation process comparable to that of real guidewires, with an average response time of 6 ms. In the interaction of blood vessel and guidewire models, the simulator blood vessel model used for coronary vascular intervention training exhibited an average response time of 15.42 ms, with a frame rate of approximately 64 FPS. CONCLUSIONS The method presented in this paper achieves deformation simulation of both vascular and guidewire models, demonstrating sufficient real-time performance and accuracy. The interaction efficiency between vascular and guidewire models is enhanced through the unified simulation framework and collision detection. Furthermore, it can be integrated with virtual training scenarios within the system, making it suitable for developing more advanced vascular interventional surgery training systems.
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Affiliation(s)
- Pan Li
- Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China.
| | - Boxuan Xu
- Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China
| | - Xinxin Zhang
- Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China
| | - Delei Fang
- Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China
| | - Junxia Zhang
- Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China
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Park DS, Oh S, Jin YJ, Na MH, Kim M, Kim JH, Hyun DY, Cho KH, Hong YJ, Kim JH, Ahn Y, Hermida-Prieto M, Vázquez-Rodríguez JM, Gutiérrez-Chico JL, Mariñas-Pardo L, Lim KS, Park JK, Byeon DH, Cho YN, Kee SJ, Sim DS, Jeong MH. Preliminary Investigation on Efficacy and Safety of Substance P-Coated Stent for Promoting Re-Endothelialization: A Porcine Coronary Artery Restenosis Model. Tissue Eng Regen Med 2024; 21:53-64. [PMID: 37973692 PMCID: PMC10764706 DOI: 10.1007/s13770-023-00608-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/10/2023] [Accepted: 10/11/2023] [Indexed: 11/19/2023] Open
Abstract
BACKGROUND Current polymer-based drug-eluting stents (DESs) have fundamental issues about inflammation and delayed re-endothelializaton of the vessel wall. Substance-P (SP), which plays an important role in inflammation and endothelial cells, has not yet been applied to coronary stents. Therefore, this study compares poly lactic-co-glycolic acid (PLGA)-based everolimus-eluting stents (PLGA-EESs) versus 2-methacryloyloxyethyl phosphorylcholine (MPC)-based SP-eluting stents (MPC-SPs) in in-vitro and in-vivo models. METHODS The morphology of the stent surface and peptide/drug release kinetics from stents were evaluated. The in-vitro proliferative effect of SP released from MPC-SP is evaluated using human umbilical vein endothelial cell. Finally, the safety and efficacy of the stent are evaluated after inserting it into a pig's coronary artery. RESULTS Similar to PLGA-EES, MPC-SP had a uniform surface morphology with very thin coating layer thickness (2.074 μm). MPC-SP showed sustained drug release of SP for over 2 weeks. Endothelial cell proliferation was significantly increased in groups treated with SP (n = 3) compared with the control (n = 3) and those with everolimus (n = 3) (SP: 118.9 ± 7.61% vs. everolimus: 64.3 ± 12.37% vs. the control: 100 ± 6.64%, p < 0.05). In the animal study, the percent stenosis was higher in MPC-SP group (n = 7) compared to PLGA-EES group (n = 7) (MPC-SP: 28.6 ± 10.7% vs. PLGA-EES: 16.7 ± 6.3%, p < 0.05). MPC-SP group showed, however, lower inflammation (MPC-SP: 0.3 ± 0.26 vs. PLGA-EES: 1.2 ± 0.48, p < 0.05) and fibrin deposition (MPC-SP: 1.0 ± 0.73 vs. PLGA-EES: 1.5 ± 0.59, p < 0.05) around the stent strut. MPC-SP showed more increased expression of cluster of differentiation 31, suggesting enhanced re-endothelialization. CONCLUSION Compared to PLGA-EES, MPC-SP demonstrated more decreased inflammation of the vascular wall and enhanced re-endothelialization and stent coverage. Hence, MPC-SP has the potential therapeutic benefits for the treatment of coronary artery disease by solving limitations of currently available DESs.
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Affiliation(s)
- Dae Sung Park
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- The Research Institute of Medical Sciences, Chonnam National University, Gwangju, Korea
| | - Seok Oh
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
| | - Yu Jeong Jin
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
| | - Mi Hyang Na
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
| | - Munki Kim
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
| | - Jeong Ha Kim
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
| | - Dae Young Hyun
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
| | - Kyung Hoon Cho
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Young Joon Hong
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Ju Han Kim
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Youngkeun Ahn
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Manuel Hermida-Prieto
- Instituto de Investigación Biomédica de A Coruña (INIBIC), Universidade da Coruña (UDC), A Coruña, Spain
| | - José Manuel Vázquez-Rodríguez
- Instituto de Investigación Biomédica de A Coruña (INIBIC), Universidade da Coruña (UDC), A Coruña, Spain
- Servicio de Cardiología, Complexo Hospitalario Universitario de A Coruña, A Coruña, Spain
| | - Juan Luis Gutiérrez-Chico
- Bundeswehrzentralkrankenhaus (Federal Army Central Military Hospital), Koblenz, Germany
- Universidad Alfonso X el Sabio, Madrid, Spain
| | - Luis Mariñas-Pardo
- Facultad de Ciencias de La Salud, Universidad Internacional de Valencia (VIU), Valencia, Spain
| | - Kyung Seob Lim
- Futuristic Animal Resource & Research Center, Korea Research Institute of Bioscience and Biotechnology, Ochang, Korea
| | | | | | - Young-Nan Cho
- Department of Clinical Laboratory Medicine, Chonnam National University Hospital, Gwangju, Korea
| | - Seung-Jung Kee
- Department of Clinical Laboratory Medicine, Chonnam National University Hospital, Gwangju, Korea
| | - Doo Sun Sim
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea.
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
| | - Myung Ho Jeong
- The Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea.
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.
- Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
- Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
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Wang H, Meng Z, Zhao CY, Xiao YH, Zeng H, Lian H, Guan RQ, Liu Y, Feng ZG, Han QQ. Research progress of implantation materials and its biological evaluation. Biomed Mater 2023; 18:062001. [PMID: 37591254 DOI: 10.1088/1748-605x/acf17b] [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: 01/11/2023] [Accepted: 08/17/2023] [Indexed: 08/19/2023]
Abstract
With the development of modern material science, life science and medical science, implantation materials are widely employed in clinical fields. In recent years, these materials have also evolved from inert supports or functional substitutes to bioactive materials able to trigger or promote the regenerative potential of tissues. Reasonable biological evaluation of implantation materials is the premise to make sure their safe application in clinical practice. With the continual development of implantation materials and the emergence of new implantation materials, new challenges to biological evaluation have been presented. In this paper, the research progress of implantation materials, the progress of biological evaluation methods, and also the characteristics of biocompatibility evaluation for novel implantation materials, like animal-derived implantation materials, nerve contact implantation materials, nanomaterials and tissue-engineered medical products were reviewed in order to provide references for the rational biological evaluation of implantable materials.
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Affiliation(s)
- Han Wang
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
| | - Zhu Meng
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
| | - Chen-Yu Zhao
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
| | - Yong-Hao Xiao
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Hang Zeng
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
- China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Huan Lian
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
| | - Rui-Qin Guan
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
- Yantai University, Yantai 264005, People's Republic of China
| | - Yu Liu
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
- Yantai University, Yantai 264005, People's Republic of China
| | - Zeng-Guo Feng
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Qian-Qian Han
- National Institutes for Food and Drug Control, Beijing 100050, People's Republic of China
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Kim SY, Aryal S, Yun WS, Kim WC, Moon SB, Chae GB, Key J, Kim S. Histologic evaluation of a catheter coated with paclitaxel PLGA nanoparticles in the internal jugular veins of rats. Biomed Eng Lett 2023; 13:505-514. [PMID: 37519876 PMCID: PMC10382362 DOI: 10.1007/s13534-023-00282-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 03/27/2023] [Accepted: 04/13/2023] [Indexed: 08/01/2023] Open
Abstract
The aim of this study is to investigate the potential impact of catheterization on intimal hyperplasia and explore the efficacy of Paclitaxel loaded PLGA nanoparticles (PTX-NPs) in preventing stenosis at the site of venous injury. Under general anesthesia, Central Venous Catheters were inserted into the rat's right internal jugular veins (IJV) using the cut-down technique. Twenty bare catheters (C) and twenty PTX-NPs coated catheters (P) were assigned to one of four groups (C2, C4, P2, or P4) based on catheter type and expected survival time. 2 or 4 weeks after surgery, IJVs were completely harvested by formalin fixation and gelatin infusion and slides were stained with H&E (Haematoxylin and Eosin) and Masson's technique. The P2 (Paclitaxel coating, 2 weeks) group showed the most proliferation among the four groups and the P4 (Paclitaxel coating, 4 weeks) showed a tendency to decrease proliferation. Additionally, the lumen size in the P4 group was about 6% smaller than in the P2 group, and there was a lower prevalence of stenotic grade in the P4 group. Our study suggests that PTX-NPs coated catheters may be effective in preventing venous stenosis if the intended usage is prolonged, rather than for a short-term period. Graphical abstract Schematic representation of catheter functionalization and coating of PTX-NPs on Catheter. Supplementary Information The online version contains supplementary material available at 10.1007/s13534-023-00282-y.
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Affiliation(s)
- Song-Yi Kim
- Department of Surgery, Chungnam National University Sejong Hospital, Sejong, Korea
| | - Susmita Aryal
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - Wan Su Yun
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - Woo Cheol Kim
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - Suk-bae Moon
- Department of Surgery, College of Medicine, Kangwon National University, Chun-Cheon, Korea
| | - Gi-bong Chae
- Department of Surgery, College of Medicine, Kangwon National University, Chun-Cheon, Korea
| | - Jaehong Key
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - Seongyup Kim
- Department of Surgery, College of Medicine, Yonsei University, Wonju, Korea
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Yan LL, Wei XH, Shi QP, Pan CS, Li KY, Zhang B, Wang XG, Zheng B, Wang MX, Yan L, Huang P, Liu J, Fan JY, Li H, Wang CS, Chen M, Han JY. Cardiotonic Pills® protects from myocardial fibrosis caused by in stent restenosis in miniature pigs. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2022; 106:154405. [PMID: 36067659 DOI: 10.1016/j.phymed.2022.154405] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/18/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Stent implantation has been increasingly applied for the treatment of obstructive coronary artery disease, which, albeit effective, often harasses patients by in-stent restenosis (ISR). PURPOSE The present study was to explore the role of compound Chinese medicine Cardiotonic Pills® (CP) in attenuating ISR-evoked myocardial injury and fibrosis. STUDY DESIGN Chinese miniature pigs were used to establish ISR model by implanting obsolete degradable stents into coronary arteries. Quantitative coronary angiography (QCA) was performed to confirm the success of the model. METHODS CP was given at 0.2 g/kg daily for 30 days after ISR. On day 30 and 60 after stent implantation, the myocardial infarct and myocardial blood flow (MBF) were assessed. Myocardial histology was evaluated by hematoxylin-eosin and Masson's trichrome staining. The content of ATP, MPO, and the activity of mitochondrial respiratory chain complex Ⅳ were determined by ELISA. Western blot was performed to assess the expression of ATP5D and related signaling proteins, and the mediators of myocardial fibrosis. RESULTS Treatment with CP diminished myocardial infarct size, retained myocardium structure, attenuated myocardial fibrosis, and restored MBF. CP ameliorated energy metabolism disorder, attenuated TGFβ1 up-regulation and reversed its downstream gene expression, such as Smad6 and Smad7, and inhibited the increased expression of MCP-1, PR S19, MMP-2 and MMP-9. CONCLUSION CP effectively protects myocardial structure and function from ISR challenge, possibly by regulating energy metabolism via inactivation of RhoA/ROCK signaling pathway and inhibition of monocyte chemotaxis and TGF β1/Smads signaling pathway.
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Affiliation(s)
- Lu-Lu Yan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Xiao-Hong Wei
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Haidian District, Beijing 100191, China
| | - Qiu-Ping Shi
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China
| | - Chun-Shui Pan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Kai-Yin Li
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China
| | - Bin Zhang
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China
| | - Xin-Gang Wang
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China
| | - Bo Zheng
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China
| | - Ming-Xia Wang
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Li Yan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Ping Huang
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Jian Liu
- Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Haidian District, Beijing 100191, China
| | - Jing-Yu Fan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Haidian District, Beijing 100191, China
| | - Huan Li
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China
| | - Chuan-She Wang
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Haidian District, Beijing 100191, China
| | - Ming Chen
- Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Cardiology, Peking University First Hospital, XiCheng District, Beijing 100034, China.
| | - Jing-Yan Han
- Tasly Microcirculation Research Center, Peking University Health Science Center, Haidian District, Beijing 100191, China; Key Laboratory of Stasis and Phlegm, State Administration of Traditional Chinese Medicine of the People's Republic of China, Haidian District, Beijing 100191, China; State Key Laboratory of Core Technology in Innovative Chinese Medicine, Haidian District, Beijing 100191, China; Beijing Laboratory of Integrative Microangiopathy, Haidian District, Beijing 100191, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Haidian District, Beijing 100191, China.
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Biodegradable Bone Implants as a New Hope to Reduce Device-Associated Infections-A Systematic Review. BIOENGINEERING (BASEL, SWITZERLAND) 2022; 9:bioengineering9080409. [PMID: 36004934 PMCID: PMC9405200 DOI: 10.3390/bioengineering9080409] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/28/2022] [Accepted: 08/10/2022] [Indexed: 11/24/2022]
Abstract
Bone fractures often require fixation devices that frequently need to be surgically removed. These temporary implants and procedures leave the patient more prone to developing medical device-associated infections, and osteomyelitis associated with trauma is a challenging complication for orthopedists. In recent years, biodegradable materials have gained great importance as temporary medical implant devices, avoiding removal surgery. The purpose of this systematic review was to revise the literature regarding the use of biodegradable bone implants in fracture healing and its impact on the reduction of implant-associated infections. The systematic review followed the PRISMA guidelines and was conducted by searching published studies regarding the in vivo use of biodegradable bone fixation implants and its antibacterial activity. From a total of 667 references, 23 studies were included based on inclusion and exclusion criteria. Biodegradable orthopedic implants of Mg-Cu, Mg-Zn, and Zn-Ag have shown antibacterial activity, especially in reducing infection burden by MRSA strains in vivo osteomyelitis models. Their ability to prevent and tackle implant-associated infections and to gradually degrade inside the body reduces the need for a second surgery for implant removal, with expectable gains regarding patients’ comfort. Further in vivo studies are mandatory to evaluate the efficiency of these antibacterial biodegradable materials.
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Kumari G, Abhishek K, Singh S, Hussain A, Altamimi MA, Madhyastha H, Webster TJ, Dev A. A voyage from 3D to 4D printing in nanomedicine and healthcare: part I. Nanomedicine (Lond) 2022; 17:237-253. [PMID: 35109704 DOI: 10.2217/nnm-2021-0285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The transition from 3D to 4D printing has revolutionized various domains of healthcare, pharmaceuticals, design and architecture, and coating processes. The evolution from 3D printing to 4D printing (4DP) has added a fourth dimension as a time-dependent response. This review discusses the significance, demands, various types of smart materials/biomaterials, as well as bioinks and printers used in 4DP technology. This review also provides insights into the limitations of the bioprinting process and bioinks used in various bioprinting technologies and the challenges that come with these limitations. A brief discussion on the future potential of the fundamentals and capabilities of 4D printing is also discussed.
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Affiliation(s)
- Gourvi Kumari
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Kumar Abhishek
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Sneha Singh
- Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Afzal Hussain
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia
| | - Mohammad A Altamimi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia
| | - Harishkumar Madhyastha
- Department of Cardiovascular Physiology, School of Medicine, University of Miyazaki, Miyazaki, 889 1692, Japan
| | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Abhimanyu Dev
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
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Kumari G, Abhishek K, Singh S, Hussain A, Altamimi MA, Madhyastha H, Webster TJ, Dev A. A voyage from 3D to 4D printing in nanomedicine and healthcare: part II. Nanomedicine (Lond) 2022; 17:255-270. [PMID: 35109687 DOI: 10.2217/nnm-2021-0454] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Recent advancements in biomedical tissue engineering are gaining wide interest. Implementing biology of living cells and organisms using technological solutions such as incorporating 4D printing and bioprinting for tissue regeneration/tissue repair, organ regeneration, early diagnosis of deadly diseases (particularly cancer, cardiac disorders and tuberculosis) has successfully opened a new generation of biomedical research. The present review primarily addresses the clinical application of 4D printing and bioprinting techniques for applications such as early detection of diseases and drug delivery. Notably, this review continues the discussion from part I regarding published informative data, in vitro and in vivo findings, commercial biosensors for early disease diagnosis, drug delivery and current challenges in 4D printing/bioprinting.
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Affiliation(s)
- Gourvi Kumari
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Kumar Abhishek
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Sneha Singh
- Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
| | - Afzal Hussain
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia
| | - Mohammad A Altamimi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia
| | - Harishkumar Madhyastha
- Department of Cardiovascular Physiology, School of Medicine, University of Miyazaki, Miyazaki, 889 1692, Japan
| | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Abhimanyu Dev
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India
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9
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A silver-coated copper wire as inexpensive drug eluting stent model: determination of the relative releasing properties of leoligin and derivatives. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02677-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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10
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Influence of Artery Straightening on Local Hemodynamics in Left Anterior Descending (LAD) Artery after Stent Implantation. Cardiol Res Pract 2020; 2020:6970817. [PMID: 32550022 PMCID: PMC7261340 DOI: 10.1155/2020/6970817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 04/20/2020] [Indexed: 11/29/2022] Open
Abstract
Objectives The study investigates local hemodynamic environment changes caused by straightening phenomenon and the relationship between straightening phenomenon and in-stent restenosis. Background Intravascular intervention is an effective treatment in restoring the normal flow conditions and vascular lumen. Unfortunately, in-stent restenosis often occurs in a subset of patients after stent implantation and limits the success of stent implantation outcomes. The implanted stent usually causes artery straightening locally, rather than coinciding and adjusting to the physiological curve exactly. Artery straightening would apparently modify the artery geometry and therefore alter the local hemodynamic environment, which may result in intimal hyperplasia and restenosis after stenting implantation. Methods In the current investigation, we verify the hypothesis that the artery straightening influences the local hemodynamic state using the different 3D CT models. Flow analysis for blood in the left anterior descending coronary artery and the straightening model is simulated numerically. Result The current results reveal that the straightening phenomenon alters the distribution of wall shear stress and flow patterns, decreases the wall shear stress (WSS), and increases the oscillatory shear index (OSI) and the relative residence time (RRT), especially at the proximal and distal areas of stenting. Conclusions The local straightened geometry established after stent implantation was likely to generate portions of the stenting area to a high risk of neointimal hyperplasia and subsequent restenosis.
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11
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Ye S, Wang H, Ni P, Yuan T, Liang J, Fan Y, Zhang X. Feasibility study of use of rabbit blood to evaluate platelet activation by medical devices. Thromb Res 2019; 185:171-179. [PMID: 31838449 DOI: 10.1016/j.thromres.2019.12.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 12/02/2019] [Accepted: 12/04/2019] [Indexed: 12/19/2022]
Abstract
It is important to ascertain platelet responses to blood-contacting medical devices as part of a complete hemocompatibility evaluation. Nevertheless, researchers often face the problem of insufficient quantities of human blood for evaluation of platelet activation by actual medical devices. If animal blood can replace human blood to evaluate platelet activation by medical devices, testing will be smoother and will aid for quality control of related products. Therefore, in this study, we exposed representative biomaterials to human blood, rabbit blood and mouse blood, and evaluated similarities and differences in platelet activation among the three types of blood by measuring various molecular markers. We found that rabbit blood and human blood had considerable similarity in terms of platelet activation, while mouse blood and human blood showed considerable differences. Therefore, rabbit blood may replace human blood for platelet function testing.
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Affiliation(s)
- Sheng Ye
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China
| | - Hong Wang
- Institute of Blood Transfusion, Chinese Academy of Medical Science & Peking Union Medical College, Chengdu, Sichuan, China
| | - Panxianzhi Ni
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China
| | - Tun Yuan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Jie Liang
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China
| | - Yujiang Fan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
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12
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Ye S, Wang H, Zhao F, Yuan T, Liang J, Fan Y, Zhang X. Evaluating platelet activation related to the degradation of biomaterials using molecular markers. Colloids Surf B Biointerfaces 2019; 184:110516. [PMID: 31569002 DOI: 10.1016/j.colsurfb.2019.110516] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 09/16/2019] [Accepted: 09/19/2019] [Indexed: 01/07/2023]
Abstract
The effective assessment of platelet activation is an important component of the evaluation of cardiovascular implants. Currently, most evaluation is performed based on the ISO 10993-4 international standard. However, the methods specified in this standard were originally designed for non-degradable materials, and the applicability of these methods to evaluate degradable materials has not been carefully assessed. Here, the platelet activation response was evaluated (using blood from health rabbits) for three typical degradable materials (collagen, polylactic acid, and hydroxyapatite) by measuring the widely used molecular markers CD62 P, CD63, and CD40 L and the three molecular markers PF4, β-TG, and TXB2 that are referenced in the ISO 10993-4 standard. The variations of these six markers were compared in the simulated degradation of the three test materials. The results showed differences in platelet activation with degradation that were strongly related to the surface physicochemical properties. Changes in the surface roughness and contact angle of the materials correlated with changes in the degree of platelet activation. The six tested platelet activation molecular markers show promise for assessment of platelet function in degradable medical devices, providing guidance for quality control strategies and the design and improvement of safe medical devices.
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Affiliation(s)
- Sheng Ye
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Hong Wang
- Institute of Blood Transfusion, Chinese Academy of Medical Science & Peking Union Medical College, Chengdu, Sichuan, China.
| | - Fenghua Zhao
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Tun Yuan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Jie Liang
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Yujiang Fan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan, China.
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13
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Arafat M, Fouladian P, Blencowe A, Albrecht H, Song Y, Garg S. Drug-eluting non-vascular stents for localised drug targeting in obstructive gastrointestinal cancers. J Control Release 2019; 308:209-231. [DOI: 10.1016/j.jconrel.2019.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/02/2019] [Accepted: 07/03/2019] [Indexed: 02/08/2023]
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14
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A Novel Approach for Assessing the Fatigue Behavior of PEEK in a Physiologically Relevant Environment. MATERIALS 2018; 11:ma11101923. [PMID: 30308932 PMCID: PMC6213617 DOI: 10.3390/ma11101923] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 09/27/2018] [Accepted: 10/06/2018] [Indexed: 11/17/2022]
Abstract
In recent years, the need of surgical procedures has continuously increased and, therefore, researchers and clinicians are broadly focusing on the development of new biocompatible materials. Among them, polyetheretherketone (PEEK) has gained wide interest in load-bearing applications due to its yielding behaviour and its superior corrosion resistance. To assure its reliability in these applications where notches and other stress concentrators weaken implants resistance, a design tool for assessing its tensile and fatigue behaviour in the presence of geometrical discontinuities is highly claimed. Herein, a new fatigue design method based on a local approach is proposed for PEEK implant, and the results are compared with those obtained using the two main biomaterial design approaches available in literature, i.e., the theory of critical distances (TCD) and the notch stress intensity factor (NSIF) approach. To this aim, previously published datasets of PEEK-notched specimens are used, and the proposed method is reported to provide more accurate results and to be robust for different notch geometries.
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15
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Borhani S, Hassanajili S, Ahmadi Tafti SH, Rabbani S. Cardiovascular stents: overview, evolution, and next generation. Prog Biomater 2018; 7:175-205. [PMID: 30203125 PMCID: PMC6173682 DOI: 10.1007/s40204-018-0097-y] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 08/25/2018] [Indexed: 12/01/2022] Open
Abstract
Compared to bare-metal stents (BMSs), drug-eluting stents (DESs) have been regarded as a revolutionary change in coronary artery diseases (CADs). Releasing pharmaceutical agents from the stent surface was a promising progress in the realm of cardiovascular stents. Despite supreme advantages over BMSs, in-stent restenosis (ISR) and long-term safety of DESs are still deemed ongoing concerns over clinically application of DESs. The failure of DESs for long-term clinical use is associated with following factors including permanent polymeric coating materials, metallic stent platforms, non-optimal drug releasing condition, and factors that have recently been supposed as contributory factors such as degradation products of polymers, metal ions due to erosion and degradation of metals and their alloys utilizing in some stents as metal frameworks. Discovering the direct relation between stent materials and associating adverse effects is a complicated process, and yet it has not been resolved. For clinical success it is of significant importance to optimize DES design and explore novel strategies to overcome all problems including inflammatory response, delay endothelialization, and sub-acute stent thrombosis (ST) simultaneously. In this work, scientific reports are reviewed particularly focusing on recent advancements in DES design which covers both potential improvements of existing and recently novel prototype stent fabrications. Covering a wide range of information from the BMSs to recent advancement, this study mostly sheds light on DES's concepts, namely stent composition, drug release mechanism, and coating techniques. This review further reports different forms of DES including fully biodegradable DESs, shape-memory ones, and polymer-free DESs.
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Affiliation(s)
- Setareh Borhani
- Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran
| | - Shadi Hassanajili
- Department of Nanochemical Engineering, School of New Science and Technology, Shiraz University, Shiraz, Iran.
| | - Seyed Hossein Ahmadi Tafti
- Research Center for Advanced Technologies in Cardiovascular Medicine, Tehran Heart Center, Tehran University of Medical Sciences, North Kargar, Tehran, Iran
| | - Shahram Rabbani
- Research Center for Advanced Technologies in Cardiovascular Medicine, Tehran Heart Center, Tehran University of Medical Sciences, North Kargar, Tehran, Iran
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16
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Hsiao HM, Lin CH, Shen YK, Chou TY, Hsu YY. Rhombic-Shaped Channel Stent with Enhanced Drug Capacity and Fatigue Life. MICROMACHINES 2017; 9:mi9010003. [PMID: 30393280 PMCID: PMC6187719 DOI: 10.3390/mi9010003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/11/2017] [Accepted: 12/21/2017] [Indexed: 01/12/2023]
Abstract
A drug-eluting stent with rhombic-shaped drug reservoirs is proposed, aimed at providing long-term drug delivery and enhanced fatigue life. Unique rhombic-shaped reservoirs or channels on the stent struts can increase the total drug capacity and improve the stress distribution for longer fatigue life, without compromising other important clinical attributes. Our rhombic-shaped channel stent increases the total drug capacity by multiple times. Its fatigue safety factor, even with the large rhombic cutouts on the stent struts, could be 50% higher than that of the conventional drug-eluting stent. A pulsed fiber-optic laser and a series of expansions and heat treatments were used to make the first prototype of our rhombic-shaped channel stent. This new concept may open up a wide variety of new treatment options and opportunities for the medical industry in the future.
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Affiliation(s)
- Hao-Ming Hsiao
- Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan.
| | - Cheng-Han Lin
- Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan.
| | - Yung-Kang Shen
- Research Center for Biomedical Devices, Taipei Medical University, Taipei 11031, Taiwan.
| | - Tzu-Yun Chou
- Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan.
| | - Yen-Yu Hsu
- Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan.
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17
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Mg and Its Alloys for Biomedical Applications: Exploring Corrosion and Its Interplay with Mechanical Failure. METALS 2017. [DOI: 10.3390/met7070252] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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18
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Zhang S, Zhang Y, Li S, Li Z. Efficacy of arsenic trioxide drug-eluting stents in the treatment of coronary heart disease. Exp Ther Med 2017; 13:1634-1636. [PMID: 28413521 DOI: 10.3892/etm.2017.4106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/27/2016] [Indexed: 01/14/2023] Open
Abstract
The aim of the current study was to evaluate the safety and clinical efficacy of arsenic trioxide drug-eluting (AVI) stents, manufactured in China, for the treatment of coronary heart disease (CHD). Between January and August 2014, 40 patients with CHD admitted to Yongchuan Hospital with implanted AVI stents alone were selected. A one-year clinical follow-up was completed and one year postoperative coronary angiography was reviewed. Major adverse cardiovascular events (MACE), recurrent angina, stent restenosis and stent thrombosis cases were detected. All 40 patients with CHD completed the one-year clinical follow-up, as well as the one-year postoperative coronary angiography. The follow-up results indicated that the MACE rate was 15.0% (6/40), the target lesion revascularization rate was 15.0% (6/40), the angina recurrence rate was 32.5% (13/40), the in-stent restenosis rate was 20.0% (8/40) and the stent thrombosis rate was zero. There were no cases of cardiac death or nonfatal myocardial infarction. The incidence of restenosis was higher following implantation of the AVI stent and the safety and clinical efficacy were worse than expected.
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Affiliation(s)
- Shasha Zhang
- Department of Cardiology, Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, P.R. China
| | - Yuping Zhang
- Department of Cardiology, Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, P.R. China
| | - Shichuan Li
- Department of Cardiology, Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, P.R. China
| | - Zhifeng Li
- Department of Cardiology, Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, P.R. China
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Bae IH, Jeong MH, Kim JH, Park YH, Lim KS, Park DS, Shim JW, Kim JH, Ahn Y, Hong YJ, Sim DS. The Control of Drug Release and Vascular Endothelialization after Hyaluronic Acid-Coated Paclitaxel Multi-Layer Coating Stent Implantation in Porcine Coronary Restenosis Model. Korean Circ J 2017; 47:123-131. [PMID: 28154600 PMCID: PMC5287174 DOI: 10.4070/kcj.2016.0203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 08/03/2016] [Accepted: 10/07/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Hyaluronic acid (HA) is highly biocompatible with cells and the extracellular matrix. In contrast to degradation products of a synthetic polymer, degradation products of HA do not acidify the local environment. The aim of this study was to fabricate an HA-coated paclitaxel (PTX)-eluting stent via simple ionic interactions and to evaluate its effects in vitro and in vivo. MATERIALS AND METHODS HA and catechol were conjugated by means of an activation agent, and then the stent was immersed in this solution (resulting in a HA-coated stent). After that, PTX was immobilized on the HA-coated stent (resulting in a hyaluronic acid-coated paclitaxel-eluting stent [H-PTX stent]). Study groups were divided into 4 groups: bare metal stent (BMS), HA, H-PTX, and poly (L-lactide)-coated paclitaxel-eluting stent (P-PTX). Stents were randomly implanted in a porcine coronary artery. After 4 weeks, vessels surrounding the stents were isolated and subjected to various analyses. RESULTS Smoothness of the surface was maintained after expansion of the stent. In contrast to a previous study on a PTX-eluting stent, in this study, the PTX was effectively released up to 14 days (a half amount of PTX in 4 days). The proliferation of smooth muscle cells was successfully inhibited (by 80.5±12.11% at 7 days of culture as compared to the control) by PTX released from the stent. Animal experiments showed that the H-PTX stent does not induce an obvious inflammatory response. Nevertheless, restenosis was clearly decreased in the H-PTX stent group (9.8±3.25%) compared to the bare-metal stent group (29.7±8.11%). CONCLUSION A stent was stably coated with PTX via simple ionic interactions with HA. Restenosis was decreased in the H-PTX group. These results suggest that HA, a natural polymer, is suitable for fabrication of drug-eluting stents (without inflammation) as an alternative to a synthetic polymer.
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Affiliation(s)
- In-Ho Bae
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea
| | - Myung Ho Jeong
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Ju Han Kim
- Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Yong Hwan Park
- Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Division of Cardiology, Department of Internal Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Kyung Seob Lim
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea
| | - Dae Sung Park
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea
| | - Jae Won Shim
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea
| | - Jung Ha Kim
- The Cardiovascular Convergence Research Center of Chonnam National University Hospital, Designated by Korea Ministry of Health and Welfare, Gwangju, Korea.; Korea Cardiovascular Stent Research Institute, Jangsung, Korea
| | - Youngkeun Ahn
- Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Young Joon Hong
- Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Doo Sun Sim
- Korea Cardiovascular Stent Research Institute, Jangsung, Korea.; Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
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20
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Lekshmi KM, Che HL, Cho CS, Park IK. Drug- and Gene-eluting Stents for Preventing Coronary Restenosis. Chonnam Med J 2017; 53:14-27. [PMID: 28184335 PMCID: PMC5299126 DOI: 10.4068/cmj.2017.53.1.14] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 08/17/2016] [Accepted: 08/18/2016] [Indexed: 12/19/2022] Open
Abstract
Coronary artery disease (CAD) has been reported to be a major cause of death worldwide. Current treatment methods include atherectomy, coronary angioplasty (as a percutaneous coronary intervention), and coronary artery bypass. Among them, the insertion of stents into the coronary artery is one of the commonly used methods for CAD, although the formation of in-stent restenosis (ISR) is a major drawback, demanding improvement in stent technology. Stents can be improved using the delivery of DNA, siRNA, and miRNA rather than anti-inflammatory/anti-thrombotic drugs. In particular, genes that could interfere with the development of plaque around infected regions are conjugated on the stent surface to inhibit neointimal formation. Despite their potential benefits, it is necessary to explore the various properties of gene-eluting stents. Furthermore, multifunctional electronic stents that can be used as a biosensor and deliver drug- or gene-based on physiological condition will be a very promising way to the successful treatment of ISR. In this review, we have discussed the molecular mechanism of restenosis, the use of drug- and gene-eluting stents, and the possible roles that these stents have in the prevention and treatment of coronary restenosis. Further, we have explained how multifunctional electronic stents could be used as a biosensor and deliver drugs based on physiological conditions.
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Affiliation(s)
- Kamali Manickavasagam Lekshmi
- Department of Biomedical Sciences and BK21 PLUS Centre for Creative Biomedical Scientists, Chonnam National University Medical School, Gwangju, Korea
| | - Hui-Lian Che
- Department of Biomedical Sciences and BK21 PLUS Centre for Creative Biomedical Scientists, Chonnam National University Medical School, Gwangju, Korea.; Heart Research Centre, Chonnam National University Hospital, Gwangju, Korea
| | - Chong-Su Cho
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Korea
| | - In-Kyu Park
- Department of Biomedical Sciences and BK21 PLUS Centre for Creative Biomedical Scientists, Chonnam National University Medical School, Gwangju, Korea
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21
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Zhao J, Mo Z, Guo F, Shi D, Han QQ, Liu Q. Drug loaded nanoparticle coating on totally bioresorbable PLLA stents to prevent in-stent restenosis. J Biomed Mater Res B Appl Biomater 2016; 106:88-95. [PMID: 27875036 DOI: 10.1002/jbm.b.33794] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 08/18/2016] [Accepted: 09/04/2016] [Indexed: 11/09/2022]
Abstract
Biodegradable polymer poly (dl-lactide) (PDLLA) has been used as drug coating material for drug-eluting stents due to its excellent biocompatibility and sustained drug release ability. However, the uniform thin layer drug eluting coating on a stent not only inhibits the blood vessel's smooth muscle cell overgrowth but also delay the endotheliation process which is often associated with the occurrence of acute thrombosis. Therefore, in this study, we developed a novel coating method using PDLLA nanoparticles (NPs) as a coating to overcome this issue. The average 300 nm sized sirolimus-loaded PDLLA nanoparticles were prepared by a conventional emulsion solvent evaporation method. A low temperature plasma polymerization technology to graft hydrophilic polymers on to poly (l-lactide) stent was used to increase the surface coating efficiency of nanoparticles on the stent. Results showed that sirolimus-loaded nanoparticles can be successfully coated on to the stents with sustained drug release properties. In vitro cell culture study showed the drug loaded nanoparticle coating effectively inhibited the proliferation of smooth muscle cells while still allowed a faster proliferation of endothelial cells, suggesting that the new NP coated bioresorbable stents have the potential to reduce both the occurrence of in-stent restenosis and acute thrombosis. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 88-95, 2018.
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Affiliation(s)
- Jian Zhao
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastic, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, 266042, China
| | - Zhichao Mo
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastic, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, 266042, China
| | - Fangfang Guo
- The Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, 200092, China
| | - Donglu Shi
- The Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, 200092, China
| | - Qian Qian Han
- National Institute for the Control of Pharmaceutical and Biological Products, Beijing, 100050, China
| | - Qing Liu
- The Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, 200092, China.,Beijing Advanced Medical Technologies, Co. Ltd., 5 Kaituo Road, Room A403, Beijing, 100085, China
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22
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Tian X, Sun A, Liu X, Pu F, Deng X, Kang H, Fan Y. Influence of catheter insertion on the hemodynamic environment in coronary arteries. Med Eng Phys 2016; 38:946-51. [PMID: 27394085 DOI: 10.1016/j.medengphy.2016.06.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 04/13/2016] [Accepted: 06/08/2016] [Indexed: 11/25/2022]
Abstract
Intravascular stenting is one of the most commonly used treatments to restore the vascular lumen and flow conditions, while perioperative complications such as thrombosis and restenosis are still nagging for patients. As the catheter with crimped stent and folded balloon is directly advanced through coronary artery during surgery, it is destined to cause interference as well as obstructive effect on blood flow. We wonder how the hemodynamic environment would be disturbed and weather these disturbances cause susceptible factors for those complications. Therefore, a realistic three-dimensional model of left coronary artery was reconstructed and blood flow patterns were numerically simulated at seven different stages in the catheter insertion process. The results revealed that the wall shear stress (WSS) and velocity in left anterior descending (LAD) were both significantly increased after catheter inserted into LAD. Besides, the WSS on the catheter, especially at the ending of the catheter, was also at high level. Compared with the condition before catheter inserted, the endothelial cells of LAD was exposed to high-WSS condition and the risk of platelet aggregation in blood flow was increased. These influences may make coronary arteries more vulnerable for perioperative complications.
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Affiliation(s)
- Xiaopeng Tian
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China
| | - Anqiang Sun
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China.
| | - Xiao Liu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China
| | - Fang Pu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China
| | - Xiaoyan Deng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China
| | - Hongyan Kang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Ministry of Science and Technology, School of Biological Science and Medical Engineering, Beihang University, 100191 Beijing, China.
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Seo J, Lee J, Na K. Polymeric materials for drug release system in drug eluting stents. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2016. [DOI: 10.1007/s40005-016-0251-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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24
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Abstract
Nanotechnology has gained an increased interest in several different areas of biotechnology including the drug delivery via nanofibers. Self-assembly, phase separation and electrospinning can all be used to successfully generate nanofibers with sizes well within the range of those of the fibers present in the native extracellular matrix (50-500 nm). In this article, the authors introduced the most popular applications of nanofibers related to the delivery of antimicrobial agents for infectious diseases. To date, only a few in-vivo studies are available at present to demonstrate its clinical potential; most of the studies are of exploratory nature and rely mostly on in-vitro experiments. Therefore, further advancement in the production and clinical performance of drug-loaded nanofibrous matrices seems necessary.
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Affiliation(s)
- Dave Wei-Chih Chen
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Keelung, Taiwan
| | - Shih-Jung Liu
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
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Gielen S, Haude M, Tebbe U, Frantz S. Moderne Koronarstents und „vascular scaffolds“. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2016. [DOI: 10.1007/s00398-016-0065-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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26
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Yıldız A, Yıldız C. Long-term clinical results of saphenous vein bypass graft lesions treated with bare-metal stents and drug eluting stents. INTERNATIONAL JOURNAL OF THE CARDIOVASCULAR ACADEMY 2015. [DOI: 10.1016/j.ijcac.2015.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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27
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Synthesis and characterization of curcumin segmented polyurethane with induced antiplatelet activity. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0824-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Microstructure–property relationship of l-lactide/trimethylene carbonate/glycolide terpolymers as cardiovascular stent material. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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He D, Liu W, Zhang T. The development of carotid stent material. INTERVENTIONAL NEUROLOGY 2015; 3:67-77. [PMID: 26019710 PMCID: PMC4439791 DOI: 10.1159/000369480] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Endovascular angioplasty with stenting is a promising option for treating carotid artery stenosis. There exist a rapidly increasing number of different stent types with different materials. The bare-metal stent is the most commonly used stent with acceptable results, but it leaves us with the problems of thrombosis and restenosis. The drug-eluting stent is a breakthrough as it has the ability to reduce the restenosis rate, but the problem of late thrombosis still has to be addressed. The biodegradable stent disappears after having served its function. However, restenosis and degradation rates remain to be studied. In this article, we review every stent material with its characteristics, clinical results and complications and point out the standards of an ideal carotid stent.
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Affiliation(s)
- Dongsheng He
- Department of Neurology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Wenhua Liu
- Department of Neurology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China
| | - Tao Zhang
- College of Engineering and Applied Science, Nanjing University, Nanjing, China
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30
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Lee CH, Yu CY, Chang SH, Hung KC, Liu SJ, Wang CJ, Hsu MY, Hsieh IC, Chen WJ, Ko YS, Wen MS. Promoting endothelial recovery and reducing neointimal hyperplasia using sequential-like release of acetylsalicylic acid and paclitaxel-loaded biodegradable stents. Int J Nanomedicine 2014; 9:4117-33. [PMID: 25206303 PMCID: PMC4157626 DOI: 10.2147/ijn.s67721] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
INTRODUCTION This work reports on the development of a biodegradable dual-drug-eluting stent with sequential-like and sustainable drug-release of anti-platelet acetylsalicylic acid and anti-smooth muscle cell (SMC) proliferative paclitaxel. METHODS To fabricate the biodegradable stents, poly-L-lactide strips are first cut from a solvent-casted film. They are rolled onto the surface of a metal pin to form spiral stents. The stents are then consecutively covered by acetylsalicylic acid and paclitaxel-loaded polylactide-polyglycolide nanofibers via electrospinning. RESULTS Biodegradable stents exhibit mechanical properties that are superior to those of metallic stents. Biodegradable stents sequentially release high concentrations of acetylsalicylic acid and paclitaxel for more than 30 and 60 days, respectively. In vitro, the eluted drugs promote endothelial cell numbers on days 3 and 7, and reduce the proliferation of SMCs in weeks 2, 4, and 8. The stents markedly inhibit the adhesion of platelets on days 3, 7, and 14 relative to a non-drug-eluting stent. In vivo, the implanted stent is intact, and no stent thrombosis is observed in the stent-implanted vessels without the administration of daily oral acetylsalicylic acid. Promotion of endothelial recovery and inhibition of neointimal hyperplasia are also observed on the stented vessels. CONCLUSION The work demonstrates the efficiency and safety of the biodegradable dual-drug-eluting stents with sequential and sustainable drug release to diseased arteries.
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Affiliation(s)
- Cheng-Hung Lee
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
| | - Chia-Ying Yu
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
| | - Shang-Hung Chang
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
| | - Kuo-Chun Hung
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
| | - Shih-Jung Liu
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
| | - Chao-Jan Wang
- Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Linkou, Tao-Yuan, Taiwan
| | - Ming-Yi Hsu
- Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Linkou, Tao-Yuan, Taiwan
| | - I-Chang Hsieh
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
| | - Wei-Jan Chen
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
| | - Yu-Shien Ko
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
| | - Ming-Shien Wen
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Tao-Yuan, Taiwan
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31
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Scott R, Panitch A. Macromolecular approaches to prevent thrombosis and intimal hyperplasia following percutaneous coronary intervention. Biomacromolecules 2014; 15:2825-32. [PMID: 24964369 PMCID: PMC4130236 DOI: 10.1021/bm5007757] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 06/18/2014] [Indexed: 01/29/2023]
Abstract
Cardiovascular disease remains one of the largest contributors to death worldwide. Improvements in cardiovascular technology leading to the current generation of drug-eluting stents, bioresorbable stents, and drug-eluting balloons, coupled with advances in antirestenotic therapeutics developed by pharmaceutical community, have had a profound impact on quality of life and longevity. However, these procedures and devices contribute to both short- and long-term complications. Thus, room for improvement and development of new, alternative strategies exists. Two major approaches have been investigated to improve outcomes following percutaneous coronary intervention including perivascular delivery and luminal paving. For both approaches, polymers play a major role as controlled research vehicles, carriers for cells, and antithrombotic coatings. With improvements in catheter delivery devices and increases in our understanding of the biology of healthy and diseased vessels, the time is ripe for development of novel macromolecular coatings that can protect the vessel lumen following balloon angioplasty and promote healthy vascular healing.
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Affiliation(s)
- Rebecca
A. Scott
- Weldon
School of Biomedical
Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Alyssa Panitch
- Weldon
School of Biomedical
Engineering, Purdue University, West Lafayette, Indiana 47907, United States
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32
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Paryab N, Cronin DS, Lee-Sullivan P. Finite element methods to analyze helical stent expansion. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2014; 30:339-352. [PMID: 24123985 DOI: 10.1002/cnm.2605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 08/23/2013] [Accepted: 09/17/2013] [Indexed: 06/02/2023]
Abstract
Helical polymeric stents have been proposed as a suitable geometry for biodegradable drug-eluting polymer-based stents. However, helical stents often experience nonuniform local expansion (dog boning), which can prohibit full stent expansion using conventional methods. The development of stents and deployment methods is challenging and can be supported by numerical analysis; however, this complex problem is often approached with simplified boundary conditions that may not be appropriate for helical stents. The finite element method (explicit and implicit) was used to investigate three common stent expansion approaches with a focus on helical stent geometry, which differs from traditional wire mesh stent expansion. Although each of the three methods considered provided some insight into the expansion characteristics, common displacement controlled, and uniform expansion methods were not able to demonstrate the characteristic local deformations observed in expansion. A coupled stent-balloon model, although computationally expensive, was able to demonstrate the expected nonuniform deformation. To address nonuniform expansion, a progressive expansion approach has been investigated and verified numerically. This method may also provide a suitable solution for nonuniform expansion in other stent designs by minimizing loading and potential damage to the artery that can occur during stent deployment.
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Affiliation(s)
- Nasim Paryab
- University of Waterloo, Waterloo, Ontario, Canada
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33
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Ceschi P, Bohl A, Sternberg K, Neumeister A, Senz V, Schmitz K, Kietzmann M, Scheper V, Lenarz T, Stöver T, Paasche G. Biodegradable polymeric coatings on cochlear implant surfaces and their influence on spiral ganglion cell survival. J Biomed Mater Res B Appl Biomater 2014; 102:1255-67. [DOI: 10.1002/jbm.b.33110] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 11/08/2013] [Accepted: 01/04/2014] [Indexed: 12/31/2022]
Affiliation(s)
- P. Ceschi
- Hannover Medical School; Department of Otolaryngology; Hannover Germany
- School of Veterinary Medicine Hannover Foundation; Department of Pharmacology; Toxicology and Pharmacy Hannover Germany
| | - A. Bohl
- University of Rostock, Institute for Biomedical Engineering; Rostock Germany
| | - K. Sternberg
- University of Rostock, Institute for Biomedical Engineering; Rostock Germany
| | | | - V. Senz
- University of Rostock, Institute for Biomedical Engineering; Rostock Germany
| | - K.P. Schmitz
- University of Rostock, Institute for Biomedical Engineering; Rostock Germany
| | - M. Kietzmann
- School of Veterinary Medicine Hannover Foundation; Department of Pharmacology; Toxicology and Pharmacy Hannover Germany
| | - V. Scheper
- Hannover Medical School; Department of Otolaryngology; Hannover Germany
| | - T. Lenarz
- Hannover Medical School; Department of Otolaryngology; Hannover Germany
| | - T. Stöver
- Hannover Medical School; Department of Otolaryngology; Hannover Germany
- KGU; Department of Otolaryngology; Frankfurt Germany
| | - G. Paasche
- Hannover Medical School; Department of Otolaryngology; Hannover Germany
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34
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Khan W, Muntimadugu E, Jaffe M, Domb AJ. Implantable Medical Devices. ADVANCES IN DELIVERY SCIENCE AND TECHNOLOGY 2014. [DOI: 10.1007/978-1-4614-9434-8_2] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
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35
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Scott RA, Paderi JE, Sturek M, Panitch A. Decorin mimic inhibits vascular smooth muscle proliferation and migration. PLoS One 2013; 8:e82456. [PMID: 24278482 PMCID: PMC3838406 DOI: 10.1371/journal.pone.0082456] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 11/04/2013] [Indexed: 01/06/2023] Open
Abstract
Over the past 10 years, the number of percutaneous coronary intervention procedures performed in the United States increased by 33%; however, restenosis, which inhibits complete functional recovery of the vessel wall, complicates this procedure. A wide range of anti-restenotic therapeutics have been developed, although many elicit non-specific effects that compromise vessel healing. Drawing inspiration from biologically-relevant molecules, our lab developed a mimic of the natural proteoglycan decorin, termed DS-SILY, which can mask exposed collagen and thereby effectively decrease platelet activation, thus contributing to suppression of vascular intimal hyperplasia. Here, we characterize the effects of DS-SILY on both proliferative and quiescent human SMCs to evaluate the potential impact of DS-SILY-SMC interaction on restenosis, and further characterize in vivo platelet interactions. DS-SILY decreased proliferative SMC proliferation and pro-inflammatory cytokine secretion in vitro in a concentration dependent manner as compared to untreated controls. The addition of DS-SILY to in vitro SMC cultures decreased SMC migration and protein synthesis by 95% and 37%, respectively. Furthermore, DS-SILY decreased platelet activation, as well as reduced neointimal hyperplasia by 60%, in vivo using Ossabaw swine. These results indicate that DS-SILY demonstrates multiple biological activities that may all synergistically contribute to an improved treatment paradigm for balloon angioplasty.
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Affiliation(s)
- Rebecca A. Scott
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
| | - John E. Paderi
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
| | - Michael Sturek
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Alyssa Panitch
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
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Basnett P, Ching K, Stolz M, Knowles J, Boccaccini A, Smith C, Locke I, Keshavarz T, Roy I. Novel Poly(3-hydroxyoctanoate)/Poly(3-hydroxybutyrate) blends for medical applications. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2013.03.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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In-Stent Restenosis in the Superficial Femoral Artery. Ann Vasc Surg 2013; 27:510-24. [DOI: 10.1016/j.avsg.2012.09.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 08/07/2012] [Accepted: 09/16/2012] [Indexed: 11/20/2022]
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38
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Gilchrist SE, Lange D, Letchford K, Bach H, Fazli L, Burt HM. Fusidic acid and rifampicin co-loaded PLGA nanofibers for the prevention of orthopedic implant associated infections. J Control Release 2013; 170:64-73. [PMID: 23639451 DOI: 10.1016/j.jconrel.2013.04.012] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 04/16/2013] [Accepted: 04/22/2013] [Indexed: 02/08/2023]
Abstract
Implant-associated infections following invasive orthopedic surgery are a major clinical problem, and are one of the primary causes of joint failure following total joint arthroplasty. Current strategies using perioperative antibiotics have been met with little clinical success and have resulted in various systemic toxicities and the promotion of antibiotic resistant microorganisms. Here we report the development of a biodegradable localized delivery system using poly(D,L-lactic acid-co-glycolic acid) (PLGA) for the combinatorial release of fusidic acid (FA) (or its sodium salt; SF) and rifampicin (RIF) using electrospinning. The drug-loaded formulations showed good antibiotic encapsulation (~75%-100%), and a biphasic drug release profile. All dual-loaded formulations showed direct antimicrobial activity in vitro against Staphylococcus epidermidis, and two strains of methicillin-resistant Staphylococcus aureus (MRSA). Furthermore, lead formulations containing 10% (w/w) FA/SF and 5% (w/w) RIF were able to prevent the adherence of MRSA to a titanium implant in an in vivo rodent model of subcutaneous implant-associated infection.
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Affiliation(s)
- Samuel E Gilchrist
- Faculty of Pharmaceutical Science, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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39
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Iqbal J, Gunn J, Serruys PW. Coronary stents: historical development, current status and future directions. Br Med Bull 2013; 106:193-211. [PMID: 23532779 DOI: 10.1093/bmb/ldt009] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
INTRODUCTION Coronary angioplasty with stenting has revolutionized the treatment of coronary artery disease. This article describes the history of coronary angioplasty and stenting, reviews the contemporary stents and recommendations and highlights the on-going work and potential future directions. SOURCES OF DATA This review examined the data on coronary stents available in PubMed. AREAS OF AGREEMENT Coronary artery stenting is the treatment of choice for patients requiring coronary angioplasty. Stents, and particularly drug-eluting stents, reduce the risk of restenosis, but may be associated with the hazard of late stent thrombosis. Dual anti-platelet treatment is recommended for patients receiving coronary stents. AREAS OF CONTROVERSY The selection of stents for various lesions and patients and the duration of anti-platelet therapy remain debated areas. AREAS TIMELY FOR DEVELOPING RESEARCH There are on-going preclinical and clinical studies to develop better stent platforms, more biocompatible polymers, novel anti-proliferative and anti-platelet drugs, pro-healing stents and bioresorbable scaffolds.
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Affiliation(s)
- Javaid Iqbal
- Thorax Centre, Erasmus Medical Centre, Rotterdam, The Netherlands.
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40
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Kim HK, Jeong MH. Coronary stent thrombosis: current insights into new drug-eluting stent designs. Chonnam Med J 2012; 48:141-9. [PMID: 23323218 PMCID: PMC3539093 DOI: 10.4068/cmj.2012.48.3.141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Revised: 10/25/2012] [Accepted: 10/26/2012] [Indexed: 01/15/2023] Open
Abstract
The advances of interventional cardiology have been achieved by new device development, finding appropriate drug regimes, and understanding of pathomechanism. Drug-eluting stents (DES) implantation with dual anti-platelet therapy reduced revascularization without increasing mortality or myocardial infarction compared with bare-metal stenting. However, late-term stent thrombosis (ST) and restenosis limited its value and raised the safety concern. Main mechanisms of this phenomenon are impaired endothelialization and hypersensitivity reaction with polymer. The second generation DES further improved safety and/or efficacy by using thinner stent strut and biocompatible polymer. Recently, new concept DES with biodegradable polymer, polymer-free and bioabsorbable scaffold are under investigation in the quest to minimize the risk of ST.
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Affiliation(s)
- Hyun Kuk Kim
- The Heart Research Center Nominated by Korea Ministry of Health and Welfare, Chonnam National University Hospital, Gwangju, Korea. ; Korea Cardiovascular Stent Research Institute, Chonnam National University, Gwangju, Korea
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41
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Paryab N, Cronin D, Lee-Sullivan P, Ying X, Boey FYC, Venkatraman S. Uniform Expansion of a Polymeric Helical Stent. J Med Device 2012. [DOI: 10.1115/1.4005777] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Helical coil polymeric stents provide an alternative method of stenting compared to traditional metallic stents, but require additional investigation to understand deployment, expansion, and fixation. A bilayer helical coil stent consisting of PLLA and PLGA was investigated using the finite element model to evaluate performance by uniform expansion and subsequent recoiling. In vitro material characterization studies showed that a preinsertion water-soaking step to mimic body implantation conditions provided the required ductility level expansion. In this case, the mechanical contribution of the outer PLGA layer was negligible since it softened significantly under environmental conditions. The viscoelastic response was not considered in this study since the strain rate during expansion was relatively slow and the material response was primarily plastic. The numerical model was validated with available experimental expansion and recoiling data. A parametric study was then undertaken to investigate the effect of stent geometry and coefficient of friction at the stent-cylinder interface on the expansion and recoiling characteristics. The model showed that helical stents exhibit a uniform stress distribution after expansion, which is important for controlled degradation when using biodegradable materials. The results indicated that increasing stent width, pitch value, and coil thickness resulted in a larger diameter after recoiling, which would improve fixation in the artery. It was also noted that a helical stent should have more than five coils to be stable after recoiling. This work is part of a larger research study focused on the performance of a balloon-inflated polymeric helical stent for artery applications.
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Affiliation(s)
- Nasim Paryab
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West Waterloo, Ontario N2L 3G1, Canada
| | - Duane Cronin
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West Waterloo, Ontario N2L 3G1, Canada
| | - Pearl Lee-Sullivan
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West Waterloo, Ontario N2L 3G1, Canada
| | - Xiong Ying
- Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
| | - Freddy Y. C. Boey
- Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
| | - Subbu Venkatraman
- Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
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42
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A perivascular system releasing sirolimus prevented intimal hyperplasia in a rabbit model in a medium-term study. Int J Pharm 2012; 427:311-9. [DOI: 10.1016/j.ijpharm.2012.02.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Revised: 02/12/2012] [Accepted: 02/13/2012] [Indexed: 12/20/2022]
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43
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St Laurent P. Acute coronary syndrome: new and evolving therapies. Crit Care Nurs Clin North Am 2011; 23:559-71. [PMID: 22118114 DOI: 10.1016/j.ccell.2011.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
There are many new developments in both the invasive and noninvasive treatment of ACS. As technology, pharmaceuticals, and research continue to bring new therapies to the forefront, it is essential that clinicians stay current in their understanding of how this new knowledge will impact patients and alter clinical outcomes.
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Affiliation(s)
- Paul St Laurent
- Baylor Heart and Vascular Hospital, 621 North Hall Street, Dallas, TX 75226, USA.
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Lewis F, Cloutier M, Chevallier P, Turgeon S, Pireaux JJ, Tatoulian M, Mantovani D. Influence of the 316 L stainless steel interface on the stability and barrier properties of plasma fluorocarbon films. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2323-2331. [PMID: 21545130 DOI: 10.1021/am200245d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Coatings are known to be one of the more suited strategies to tailor the interface between medical devices and the surrounding cells and tissues once implanted. The development of coatings and the optimization of their adhesion and stability are of major importance. In this work, the influence of plasma etching of the substrate on a plasma fluorocarbon ultrathin coating has been investigated with the aim of improving the stability and the corrosion properties of coated medical devices. The 316 L stainless steel interface was subjected to two different etching sequences prior to the plasma deposition. These plasma etchings, with H(2) and C(2)F(6) as gas precursors, modified the chemical composition and the thickness of the oxide layer and influenced the subsequent polymerization. The coating properties were evaluated using flat substrates submitted to deformation, aging into aqueous medium and corrosion tests. X-ray photoelectron spectroscopy (XPS), time of flight-secondary ion mass spectrometry (ToF-SIMS), ellipsometry, and atomic force microscopy (AFM) were performed to determine the effects of the deformation and the aging on the chemistry and morphology of the coated samples. Analyses showed that plasma etchings were essential to promote reproducible polymerization and film growth. However, the oxide layer thinning due to the etching lowered the corrosion resistance of the substrate and affected the stability of the interface. Still, the deformed samples did not exhibited adhesion and cohesion failure before and after the aging.
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Affiliation(s)
- François Lewis
- Laboratory for Biomaterials and Bioengineering, Department of Materials Engineering & University Hospital Research Center, Laval University, Quebec City, QC, G1K 7P4, Canada
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Motwani MS, Rafiei Y, Tzifa A, Seifalian AM. In situ endothelialization of intravascular stents from progenitor stem cells coated with nanocomposite and functionalized biomolecules. Biotechnol Appl Biochem 2011; 58:2-13. [DOI: 10.1002/bab.10] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Sternberg K. Current requirements for polymeric biomaterials in otolaryngology. GMS CURRENT TOPICS IN OTORHINOLARYNGOLOGY, HEAD AND NECK SURGERY 2011; 8:Doc11. [PMID: 22073104 PMCID: PMC3199814 DOI: 10.3205/cto000063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In recent years otolaryngology was strongly influenced by newly developed implants which are based on both, innovative biomaterials and novel implant technologies. Since the biomaterials are integrated into biological systems they have to fulfill all technical requirements and accommodate biological interactions. Technical functionality relating to implant specific mechanical properties, a sufficiently high stability in terms of physiological conditions, and good biocompatibility are the demands with regard to suitability of biomaterials. The goal in applying biomaterials for implants is to maintain biofunctionality over extended periods of time. These general demands to biomaterials are equally valid for use in otolaryngology. Different classes of materials can be utilized as biomaterials. Metals belong to the oldest biomaterials. In addition, alloys, ceramics, inorganic glasses and composites have been tested successfully. Furthermore, natural and synthetic polymers are widely used materials, which will be in the focus of the current article with regard to their properties and usage as cochlear implants, osteosynthesis implants, stents, and matrices for tissue engineering. Due to their application as permanent or temporary implants materials are differentiated into biostable and biodegradable polymers. The here identified general and up to date requirements for biomaterials and the illustrated applications in otolaryngology emphasize ongoing research efforts in this area and at the same time demonstrate the high significance of interdisciplinary cooperation between natural sciences, engineering, and medical sciences.
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Affiliation(s)
- Katrin Sternberg
- Institut für Biomedizinische Technik, University Rostock, Germany
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Osaki S, Chen M, Zamora PO. Controlled drug release through a plasma polymerized tetramethylcyclo-tetrasiloxane coating barrier. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2011; 23:483-96. [PMID: 21294969 DOI: 10.1163/092050610x552753] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A plasma polymerized tetramethylcyclo-tetrasiloxane (TMCTS) coating was deposited onto a metallic biomaterial, 316 stainless steel, to control the release rate of drugs, including daunomycin, rapamycin and NPC-15199 (N-(9-fluorenylmethoxy-carbonyl)-leucine), from the substrate surface. The plasma-state polymerized TMCTS thin film was deposited in a vacuum plasma reactor operated at a radio-frequency of 13.56 MHz, and was highly adhesive to the stainless steel, providing a smooth and hard coating layer for drugs coated on the substrate. To investigate the influence of plasma coating thickness on the drug diffusion profile, coatings were deposited at various time lengths from 20 s to 6 min, depending on the type of drug. Atomic force spectroscopy (AFM) was utilized to characterize coating thickness. Drug elution was measured using a spectrophotometer or high-performance liquid chromatography (HPLC) system. The experimental results indicate that plasma polymerized TMCTS can be used as an over-coating to control drug elution at the desired release rate. The drug-release rate was also found to be dependent on the molecular weight of the drug with plasma coating barrier on top of it. The in vitro cytotoxicity test result suggested that the TMCTS plasma coatings did not produce a cytotoxic response to mammalian cells. The non-cytotoxicity of TMCTS coating plus its high thrombo-resistance and biocompatibility are very beneficial to drug-eluting devices that contact blood.
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Affiliation(s)
- Shigemasa Osaki
- BioSurface Engineering Technologies (BioSET), Inc., 9430 Key West Avenue, Rockville, MD 20850, USA
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Yang J, Liu F, Tu S, Chen Y, Luo X, Lu Z, Wei J, Li S. Haemo- and cytocompatibility of bioresorbable homo- and copolymers prepared from 1,3-trimethylene carbonate, lactides, and epsilon-caprolactone. J Biomed Mater Res A 2010; 94:396-407. [PMID: 20186738 DOI: 10.1002/jbm.a.32677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of bioresorbable polymers were prepared by ring-opening polymerization of L-lactide (LLA), DL-lactide (DLLA), epsilon-caprolactone (CL) and 1,3-trimethylene carbonate (TMC), using low toxic zinc lactate as catalyst. The various PLLA, PTMC, PCL homopolymers, and PLLA-TMC, PDLLA-TMC, PCL-TMC copolymers with 50/50 molar ratios were characterized by using analytical techniques such as proton nuclear magnetic resonance, gel permeation chromatography, tensiometer, and differential scanning calorimetry. The haemo- and cyto-compatibility were investigated in order to evaluate the potential of the polymers as coating material in drug eluting stents. Haemolysis tests show that all the homo- and copolymers present very low haemolytic ratios, indicating good haemolytic properties. Adhesion and activation of platelets were observed on the surface of PLLA, PCL, PLLA-TMC, and PDLLA-TMC films, while less platelets and lower activation were found on PTMC. The most interesting results were obtained with PCL-TMC which exhibited the lowest degree of activation with few adhered platelets, in agreement with its outstanding anticoagulant properties. Both indirect and direct cytocompatibility studies were performed on the polymers. The relative growth ratio data obtained from the liquid extracts during the 6-day cell culture period indicate that all the polymers present very low cytotoxicity. Microscopic observations demonstrate adhesion, spreading and proliferation of human umbilical vein endothelial cells ECV304. Therefore, it is concluded that these bioresorbable polymers, in particular PCL-TMC, are promising candidate materials as drug loading coating material in drug eluting stents.
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Affiliation(s)
- Jian Yang
- Department of Materials Science, Fudan University, Shanghai 200433, China
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Computational Investigation of the Delamination of Polymer Coatings During Stent Deployment. Ann Biomed Eng 2010; 38:2263-73. [DOI: 10.1007/s10439-010-9972-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 02/16/2010] [Indexed: 11/27/2022]
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