基于解析模型与有限元仿真的医疗编织支架机械性能对比分析

Comparative Analysis of Mechanical Properties of Medical Braided Stent Based on Analytical Model and Finite Element Model

摘要: 本文运用ANSYS对医疗编织支架进行有限元模型的构建，模拟了支架受到压缩管作用产生径向压缩的过程。考虑到支架的编织特性以及在编织线丝交错位置存在大量的非线性接触，本文参考了经实验验证的编织支架的解析模型，对比分析支架模型在受到径向压缩时几何结构和力学性能的变化特征。结果表明，该有限元模型能够有效预测编织支架受到径向压缩时长度与直径的变化关系、等效应力与支架长度的变化关系、以及受到压缩产生应力集中的部位。为具有编制特性的医疗支架有限元模型构建提供了新的思路。

Abstract: In this paper, ANSYS was used to construct the finite element model of the medical braided stent and simulate the radial compression process of the stent under the action of the compression tube. Considering the braided characteristics of the stent and the existence of a large number of non-linear contacts in the interlaced position of braided wires, the geometric structure and me-chanical properties of the braided stent model under radial compression were compared and an-alyzed by referring to the analytical model of the braided stent verified by experiments. The results show that the finite element model can effectively predict the variation relationship between the length and diameter of the braided stent, the variation relationship between the equivalent stress and the length of the stent, and the position of the stress concentration caused by the compression. It provides a new method for constructing the finite element model of medical braided stent.