Numerical investigations of the mechanical properties of a braided non-vascular stent design using finite element method |
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Authors: | Xiao-Yu Ni Chang-Wang Pan B Gangadhara Prusty |
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Institution: | 1. School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province 210037, P.R. Chinaxyni_luck@163.com;3. Jiangsu Key Laboratory for Design and Manufacture of Micro/Nano Biomedical Instruments Micro-Tech (Nanjing) Co., Ltd, Nanjing, Jiangsu Province 210096, P.R. China;4. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia |
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Abstract: | This paper discusses various issues relating to the mechanical properties of a braided non-vascular stent made of a Ni–Ti alloy. The design of the stent is a major factor which determines its reliability after implantation into a stenosed non-vascular cavity. This paper presents the effect of the main structural parameters on the mechanical properties of braided stents. A parametric analysis of a commercial stent model is developed using the commercial finite element code ANSYS. As a consequence of the analytical results that the pitch of wire has a greater effect than other structural parameters, a new design of a variable pitch stent is presented to improve mechanical properties of these braided stents. The effect of structural parameters on mechanical properties is compared for both stent models: constant and variable pitches. When the pitches of the left and right quarters of the stent are 50% larger and 100% larger than that of the central portion, respectively, the radial stiffness in the central portion increases by 10% and 38.8%, while the radial stiffness at the end portions decreases by 128% and 164.7%, the axial elongation by 25.6% and 56.6% and the bending deflection by 3.96% and 10.15%. It has been demonstrated by finite element analysis that the variable pitch stent can better meet the clinical requirements. |
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Keywords: | braided stent non-vascular finite element method mechanical properties parametric analysis |
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