血管支架膨胀过程中的塑性变形行为  

Plastic deformation during intravascular stent expansion

作　　者：宁静[1] 曾攀[1] 雷丽萍[1] 

机构地区：[1]清华大学机械工程系,先进成形制造教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第5期781-784,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50635050)

摘　　要：为研究血管支架在移入治疗中的塑性变形行为,利用有限元分析的方法对钴铬合金血管支架的特征模型和整体模型分别进行膨胀模拟分析,并通过与实验数据的比较验证了该有限元分析的合理性。模拟结果表明:支架在膨胀过程中出现轴向缩短,且轴向缩短率随径向加载位移的增大而增大。支架几何形状的优化能够有效地解决血管支架在膨胀过程中的轴向缩短问题,从而为实际的生产设计提供参考。The finite element method was used to simulate the expansion behavior of a cobalt-chromium alloy stent＇s basic model and integral model to investigate the stent＇s mechanical behavior during the implantation process. The predictions agree well with experimental data. The simulations show that the length of the stent decreases fast with increasing displacement in the radial direction during the expansion. Optimization of the stent geometry can reduce the longitudinal shortening during the expansion and prevent restenosis after implantation

关 键 词：血管支架 膨胀 轴向缩短 钴铬合金 

分 类 号：R318.01[医药卫生—生物医学工程] TP391.9[医药卫生—基础医学]