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Date of Publication:2016-01-01

Journal:功能材料

Issue:4

Page Number:4094-4098

ISSN No.:1001-9731

Abstract: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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