Simulation of mechanical behavior of temperature-responsive braided stents made of shape memory polyurethanes |
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| Authors: | Ju Hyun Kim Tae Jin Kang Woong-Ryeol Yu |
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| Institution: | 1. Key Laboratory of Textile Science and Technology of Ministry of Education and College of Textiles, Donghua University, China;2. Department of Urology, Shanghai Children?s Hospital, Shanghai Jiao Tong University, China;3. College of Textiles, North Carolina State University, USA;1. College of Textiles, Donghua University, Shanghai 201620, China;2. Key laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China;3. Department of Pediatric Cardiology of Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 1665 Kong Jiang road, Shanghai 200092, China;1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, PR China;2. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, PR China;1. Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, United States;2. Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, United States;3. Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, United States |
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| Abstract: | Polymeric stents can be considered as an alternative to metallic stents thanks to their lessened incidence of restenosis and controlled deployment. The purpose of this study was to investigate the feasibility of developing a temperature-responsive braided stent using shape memory polyurethane (SMPU) through finite element analysis. It was assumed that braided stents were manufactured using SMPU fibers. The mechanical behavior of SMPU fibers was modeled using a constitutive equation describing their one-dimensional thermal-induced shape memory behavior. Then, the braided stents were analyzed to investigate their mechanical behavior using finite element analysis software, in which the constitutive equation was implemented through a user material subroutine. The diameter of the SMPU fibers and braiding angle were chosen as the design parameters and their values were adjusted to ensure that the mechanical properties of the braided polymer stents match those of metallic stents. Finally, the deployment process of the braided stents inside narrowed vessels was simulated, showing that the SMPU stents can be comfortably implanted while minimizing the overpressure onto the vessel walls, due to their thermo-responsive shape memory behavior. |
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