负泊松比型镍钛合金血管支架结构设计及其在血管中的支撑性能研究  

Structural Design of Negative Poisson’s Ratio NiTinol Stent and Its Performance in Vascular Support

作　　者：陈翔 熊浪 付福康 禄盛 赵洋 康熙 Chen Xiang;Xiong Lang;Fu Fukang;Lu Sheng;Zhao Yang;Kang Xi(School of Advanced Manufacturing Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China;State Key Laboratory for Strength and Vibration of Mechanical Structural,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]重庆邮电大学先进制造工程学院,重庆400065 [2]重庆大学机械传动国家重点实验室,重庆400044 [3]西安交通大学机械结构强度与振动国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2024年第11期3136-3148,共13页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重点资助项目(11932004);国家自然科学基金(12272066,11802047)。

摘　　要：通过用户自定义NiTi合金子程序对负泊松比结构的凹凸型自扩张支架进行有限元模拟分析,通过控制变量法研究了不同几何参数条件下,支架在自膨胀过程中状态和应力演化情况。结果表明:随着周向支撑单元数量Nc和支撑圈倾斜杆与水平方向的夹角θ改变,凹凸型支架与之对应的支撑性能出现完全相反的变化。支架轴向距离在向四周扩张过程中变化的大小主要与参数h/l和θ呈负相关。凹凸型支架处于病变股动脉时的扩张率可以达到90.3%,高于现有自膨胀医疗支架。本凹凸型支架在股动脉中工作时可以实现均匀的扩张,直接避免了中间狭小而两端宽的情况出现。进行了Goodman疲劳曲线和疲劳因子评估,符合国家对医用支架的服役寿命要求。Through user-defined NiTi alloy subroutines,finite element simulations were conducted on concave-convex self-expanding stents featuring a negative Poisson’s ratio structure.The state and stress evolution during self-expansion were analyzed using the method of controlled variables under various geometric parameter conditions.The results indicate that the support performance of the concave-convex stent with a negative Poisson’s ratio structure is significantly influenced by the number of circumferential support units(Nc)and the angle(θ)between the inclined rod of the support ring and the horizontal direction.The axial distance of the stent during radial expansion is primarily negatively correlated with the parameters h/l andθ.The expansion rate of the concave-convex stent in the diseased femoral artery can reach 90.3%,surpassing that of existing self-expanding medical stents.This design allows for uniform expansion within the femoral artery,effectively preventing the occurrence of a narrow middle section with wider ends.Additionally,Goodman fatigue curve analysis and fatigue factor evaluation were performed,demonstrating compliance with the service life requirements for medical stents China.

关 键 词：镍钛合金 凹凸型支架 负泊松比 有限元模拟 

分 类 号：TG139.6[一般工业技术—材料科学与工程]