血管内支架的疲劳强度的有限元模拟分析  

Finite element analysis of fatigue strength of vascular stent

作　　者：冯海全[1] 张瑞敏[1] 韩青松[1] 王志国[1] 

机构地区：[1]内蒙古工业大学机械学院,呼和浩特010051

出　　处：《功能材料》2014年第14期14087-14091,14098,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(81160186);内蒙古自然科学基金资助项目(2011BS0708);内蒙古自治区高等学校科学研究资助项目(NJZY11077);内蒙古工业大学科学研究资助项目(ZD201109)

摘　　要：为了揭示支架支撑体长度、宽度及圆弧曲率半径对其疲劳强度的影响规律,利用有限元法对不同结构参数的9种血管内支架进行动静态模拟分析,并用Goodman线图评价了支架的疲劳强度。结果显示,静态扩张过程中,随着支撑体长度或圆弧曲率半径的增加,支架所需的最大等效应力有减少的趋势,而随着支撑体宽度的增加,支架所需的最大等效应力有增加的趋势。动态加载过程中,支撑体长度、支撑体宽度及圆弧曲率半径均与疲劳安全系数成反比,其中支撑体宽度对疲劳安全系数的影响要比圆弧曲率半径和支撑体长度的影响较明显。关于支架疲劳强度的有限元分析结果,为支架的优化设计提供科学的理论依据。In order to reveal the influence law of the brace body length,width,and arc radius of curvature on the fatigue strength,using the finite element method （FEM）,we implemented static and dynamic simulation analy-sis with different structure parameters of 9 kinds of endovascular stent model and evaluated fatigue strength of the stents using Goodman diagram.The results are follows：in the static expansion process,with the increase of the length of the support body or the transition arc radius of curvature,the maximum equivalent stress which the stent required to withstand has reduced tendency.With the increase of the width of the support body,it has increased tendency.In dynamic loading process,each of the support body length,the support body width and transition arc radius of curvature has the inverse ratio to fatigue safety factor.The influence of the support body width on fatigue safety factor was closer than that of transition arc radius of curvature and the support body length.The finite element analysis results of bracket fatigue strength provide scientific theory basis for the opti-mization design of the stent.

关 键 词：血管内支架 有限元法 疲劳强度 疲劳寿命 安全系数 

分 类 号：R318.11[医药卫生—生物医学工程]