自膨胀式血管支架的成功服役主要受制作材料和支架几何参数的影响。大波段 Z 型支架由于其实验室制作工艺简单、便于测试、有好的临床适用性，广泛用于实验分析和有限元分析中。本文主要运用有限元法，分析了自膨式Z型支架几何参数对其力学服役的影响。通过参数化模拟对照，发现增加顶端圆弧半径、增加支撑体长度、增加圆周V型个数均会减小支架径向抗力。但是支架超出血管的尺寸对径向抗力影响不大。对支架脉动受载及易疲劳区位置进行分析表明，支架在服役时，舒张压和收缩压下平均应变和交变应变分布不一致，最先发生疲劳的位置是支架顶端圆弧内侧，受力状态是压缩。
The successful performance of self-expansion stent,in terms of stent design,is mainly influenced by the used material and geometric parameters of the stent.Big band Z-strutstent,for the reasons thatit has sim-pleproduction process,easy to test,and has a good clinical applicability,is widely used in experimental analysis and finite element analysis.In this paper the finite element method was used to analyze the influenceofthegeo-metric parameters of self-expanding stentonits mechanical service.Through parametric simulation control,it was found that increasing the crown radius,the length of the support,and the number of V-shaped strut alongcircumference will reduce the radialresistance.But stent oversizing has little effect on radial stiffness.With-python script processing,the state of stress and strain distribution was analyzed,thelocation of fatigue zone and the stress and strain state of this zone were analyzed and discussed as well.Itwasdiscovered that when the stent moved with diastole and systole pressure,the mean strain and alternating strain distribution areinconsistentwith each other,and the position of the first occurrence of fatigue exist insideof the crown where stress state is com-pressed.
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