血管支架紧缩行为的非线性有限元分析  

Nonlinear Finite Element Analysis for Compression Behavior of Intravascular Stents

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：《中国医疗器械杂志》2008年第1期10-13,共4页Chinese Journal of Medical Instrumentation

基　　金：国家自然科学基金资助项目(No.50635050)

摘　　要：叙述了采用有限元方法系统研究血管支架的力学行为,对不同结构类型和几何尺寸的钴铬合金的血管支架在预装过程中的紧缩行为进行了精细的模拟,并与实际的测试结果进行了比较。研究表明,基于有限元方法的精细模型,可以真实地模拟出微小血管支架的力学行为。模拟结果显示,随着支架筋厚度的增加,支架的抗力增大,并且较小的金属表面积比将产生较小的轴向伸长率。这些结果对血管支架的合理设计和手术操作具有一定的启示作用。The implantation of intravascular stents has become a new method to cure stenosis in arteries with its low injury and high efficiency. The mechanical behavior of the stents is studied by the finite element method. The compression behavior is simulated with stent models of different sizes and geometry structures whose material is cobalt-chromium alloy. Experiments are also carried out to verify the simulation method, which shows that the finite element model can substitute the stent to some extent in which its mechanical behavior is studied. The results show that the reaction stress of the stent increases with the thickness of the strut. Besides, the smaller metal surface area ratio will result in a smaller elongation ratio. All these are helpful and instructive to the proper designs and actual operation of intravascular stents.

关 键 词：血管支架 紧缩 非线性 有限元分析 

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]