血管内超弹性TiNi合金支架的有限元模型及流体动力学计算分析  

Finite element model and computational fluid dynamic analysis of hyperelastic Ti-Ni alloy stent

作　　者：陈姝[1] 刘洪亮[1] 张志强[1] 

机构地区：[1]中国医科大学附属盛京医院康复科,辽宁省沈阳市110004

出　　处：《中国组织工程研究与临床康复》2009年第26期5065-5068,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

摘　　要：利用有限元模型与计算流体动力学的方法,结合有限元软件COSMOS Works与计算流体动力学软件COSMOS FloWorks,分析了具有特殊形状记忆和超弹性功能的TiNi支架在置入过程中与斑块、血管的相互作用及其对血流情况的影响。计算结果表明,使用COSMOS可较为准确地模拟TiNi合金支架的超弹性;由于具有形状记忆特征,TiNi支架置入后对血管产生更好的顺应性,不易损伤血管壁;利用TiNi材料的超弹性,大变形时会产生更大的支撑力的优势,适当缩短支撑筋的长度来增加支架的支撑力;TiNi合金超弹性产生的柔顺性能让血液流动更畅通,降低血管的再狭窄率。Vascular Ti-Ni alloy stent which has the special shape memory and superelastic was analyzed about the effect on interaction with plaque and vessels and blood flow using finite element method （FEM） with COSMOS Works and computational fluid dynamics （CFD） with COSMOS FIoWorks. The results showed that COSMOS could exactly simulate the hyperelasticity of Ti-Ni alloy stent; shape memory could cause great compliance of vessels but not easily damage vascular wall; the hyperelasticity might cause stronger supporting force to properly shorten length of supporting tendon so as to increase the supporting force of the stent; the compliance was beneficial for blood circulation and decrease incidence of vascular restenosis.

关 键 词：支架 TINI合金 超弹性 有限元 计算流体动力学 

分 类 号：R318[医药卫生—生物医学工程]