【摘要】 通过非线性有限元方法研究了冠脉支架扩张过程的变形机理和生物力学性能。在不考虑血管壁和斑块的作用下,研究支架压握收缩、自由扩张和卸载过程中的有限元模型的网格划分、材料本构模型建立、边界条件、载荷定义和接触处理等关键技术。根据有限元计算结果得到了3种支架的轴向缩短率、扩张均匀性、径向反弹率、径向支撑力和柔顺性等生物力学性能参数,并与实验测试数据进行了分析比较,数值结果与扩张实验数据吻合较好。模拟方法为冠脉支架的优化设计及性能评估提供了科学的依据。更多还原

【Abstract】 Nonlinear finite element method was used to investigate the expansion mechanism and biomechanical performance for intracoronary stents.Without regard to the interaction with vascular and plaque,the key technologies such as meshing,material constitutive model,boundary conditions,loading definition and contact interaction,were discussed in detail while the stent undergoes the crimp induced contraction,free expansion and unloading.The three different stents biomechanical performance including the axial contraction ratio,the expansion homogeneity,radical recoil rates,radial force and flexibility are determined according to finite element numerical analysis.Compared with the experimental data,the result of numerical simulation was better agreement with them.The present simulation method can help optimize and assess some biomechanical performance for intracoronary stents.更多还原