Analysis of mechanical performance of braided esophageal stent structure and its wires

作     者：倪晓宇 王果 龙志红 潘长网 Ni Xiaoyu;Wang Guo;Long Zhihong;Pan Changwang

作者机构：南京林业大学机械电子工程学院南京210037 东南大学江苏省生物医疗器械设计与制造重点实验室南京211189 南京微创医学科技有限公司南京210069 

基　　金：The National Natural Science Foundation of China(No.51005124) the Opening Foundation of Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments(No.JS-NB-2009-1-1) 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2012年第28卷第4期

页      码：457-463页

摘      要：This paper aims to find the relationship between the structural parameters and the radial stiffness of the braided stent and to understand the stress distribution law of the wires. According to the equation of the space spiral curve, a three-dimensional parametrical geometrical model is constructed. The finite element model is built by using the beam-beam contact elements and 3D beam elements. The constituent nitinol wires are assumed to be linear elastic material. The finite element analysis figures out that the radial stiffness of the stent and the stress distribution of the wires are influenced by all the structural parameters. The helix pitch of the wires is the most important factor. Under the condition of the same load and other structural parameters remaining unchanged, when the number of wires is 24, the stress of the wire crosssection is at the minimum. A comparison between the vitro experimental results and the analytical results is conducted, and the data is consistent, which proves that the current finite element model can be used to appropriately predict the mechanical performance of the braided esophageal stents.

主 题 词：braided esophageal stent finite element mechanical performance radial stiffness wire 

学科分类：0831[工学-公安技术类] 08[工学] 0836[0836] 

核心收录：

D　O　I：10.3969/j.issn.1003-7985.2012.04.015

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