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依据对血管支架支撑性能的实际测试原型,采用正交试验的方法设计不同几何参数的Ti-Ni合金血管支架分组,通过Pro/E软件建立血管支架的有限元模型,采用有限元模拟方法研究Ti-Ni合金血管支架设计几何参数对其支撑性能的影响,并与实验结果对比验证有限元分析结果的合理性。结果表明:增加支架丝的丝径或支撑筋的折弯半径,可以提高支架的支撑性能;而增大支撑筋的高度,支架的支撑性能降低;支架丝的丝径、支撑筋的高度、支撑筋的折弯半径对支架支撑性能的影响程度依次减弱,其中,支架丝的丝径和支撑筋的高度较支撑筋的折弯半径对支架支撑性能的影响更为显著;对支架进行平板压缩试验测试其支撑反力,其结果与有限元计算结果相吻合,验证了有限元分析结果的合理性。
According to the actual test prototype of the stent support performance, the orthogonal test was used to design the Ti-Ni alloy stent with different geometrical parameters. The finite element model of the stent was established by Pro / E software. The Ti -Ni alloy stent design geometry parameters of its support performance, and compared with the experimental results verify the validity of finite element analysis results. The results show that increasing the wire diameter of support wire or the bending radius of support tendons can improve the supportability of the support; while increasing the height of support ribs, the support performance of support is reduced; the wire diameter of support wire, the height of support ribs, The influence of bending radius of the ribs on the supportability of the stent is weakened in turn. The influence of the diameter of the stent silk and the height of the support tendons on the supportability of the stent is more significant than that of the support ribs. The plate compression test The test reaction force is supported. The result is in good agreement with the finite element calculation, which verifies the rationality of the finite element analysis.