Design and mechanical properties testing of a new cross-helical popliteal artery stent  

作　　者：Yuanxing Dai Hongrui Hu Jiarong Wang Ding Yuan Tinghui Zheng 

机构地区：[1]Department of Applied Mechanics,Sichuan University,Chengdu,610065,China [2]Department Vascular Surgery of West China Hospital,Sichuan University,Chengdu,610041,China

出　　处：《Medicine in Novel Technology and Devices》2021年第3期210-216,共7页医学中新技术与新装备（英文）

基　　金：This work was supported by grants from National Natural Science Foundation of China(81770471,12072214,1802253);Sichuan Provincial Department of Science and Technology Application Basic Project(2018YYJC,2019YJ0026).

摘　　要：The popliteal artery has complex deformations such as axial shortening,bending,squeezing and twisting,as well as specific positions across the knee joint.Up to now there is a high incidence of in-stent restenosis(ISR)after the stent treatment of the popliteal artery.This paper aimed to design a new type of popliteal artery stent–crosshelical stent.to meet its deformation characteristics.The finite element analysis(FEA)method was used to test the mechanical properties of six stents with different winding height ratios of axial shortening,bending,plate extrusion,and torsional deformation.The results showed that the stents performance was affected by the ratio of winding height,the larger the winding height ratio,the worse the compliance,the worse the axial compressibility,but the better the radial support.And when the stent is torsional,the greater the winding height ratio is,the greater the stress is.In additon,the maximum stress was also related to the direction of torsion deformation,and the stress when the helix has the same direction with the torsion direction of the stent are was greater than that when the helix direction and torsion direction are opposite.Moreover,when the winding height ratio is 3:5,the performance of the stent is better,not only has better flexibility,its radial force,axial compression,and torsional deformation are better.It is concluded that the new cross-helical stent can adapt to the special deformation of popliteal artery and has good mechanical properties.

关 键 词：Popliteal artery Stent design Finite element analysis helical stent 

分 类 号：R54[医药卫生—心血管疾病]