Ni-Ti合金胆管支架的结构设计与有限元分析  

Structural design and finite element analysis of Ni-Ti alloy biliary stent

作　　者：强雨霖 江鸿[1] 潘思羽 QIANG Yulin;JIANG Hong;PAN Siyu(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《有色金属材料与工程》2024年第6期32-38,共7页Nonferrous Metal Materials and Engineering

基　　金：上海理工大学医工交叉项目(1022310508);上海理工大学大学生创新创业训练计划项目(XJ2023494)。

摘　　要：利用Abaqus有限元分析软件对不同结构的Ni-Ti合金胆管支架进行了模拟计算。设计了3种不同类型的“正弦波”支撑环结构,分析了不同支撑环结构对支架径向支撑力的影响;优化了连接结构,提出了一种“斜杆”型连接结构,探寻了连接筋的不同结构与柔顺性的关系和影响机制。根据有限元计算结果,将径向支撑力较优的支架结构进行激光切割并进行实验测试。结果表明:不等高“正弦波”结构表现出较好的径向支撑力,为5.88 N;“斜杆”型连接结构表现出最佳的柔顺性能,应力集中明显改善,最大应力由传统“直杆”型连接筋支架的863.87 MPa降为589.93 MPa。平板压缩实验结果显示具有不等高“正弦波”支撑环结构的支架径向支撑力为5.78 N,与仿真结果近似相等,表明了仿真结果的可靠性。Abaqus finite element analysis software was used to simulate and calculate the biliary stents with different structures.Three different types of'sine wave'support ring structures were designed,and the influence of different support ring structures on the radial support force of the support was analyzed.The connecting structure was optimized,and an'oblique rod'type connecting structure was proposed to explore the relationship and influence mechanism between the different structures of the connecting bar and the flexibility.According to the results of finite element analysis,the stent with superior radial support force is laser cut and tested experimentally.The results show that the'sine wave'structure with unequal height shows better radial support force of 5.88 N;the'oblique rod'connecting structure shows the best flexibility and significantly reduces the stress concentration,and the maximum stress value is reduced from 863.87 MPa to 589.93 MPa compared with the traditional'straight rod'connecting stent.The results of plate compression experiment show that the radial support force of the support with unequal height'sine wave'support ring structure is 5.78 N,which is approximately equal to the simulation results,indicating the reliability of the simulation results.

关 键 词：NI-TI合金 胆管支架 有限元分析 径向支撑力 柔顺性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]