镁合金冠脉支架扩张力学性能模拟研究

Simulation studies on the expansion and mechanics performance of magnesium alloy stent

支架的扩张性能及力学性能是手术成功与否的重要因素之一。利用有限元方法仿真模拟分析了镁合金支架体外耦合扩张过程,重点研究不同支架初始直径、支撑体长度和周向个数对扩张性能及力学性能的影响,以达到结构优化的目的。结果显示,减小支架初始直径,支架应力应变分别降低3.94%和16.59%;增加支架支撑体长度,支架应力应变分别降低15.76%和49.50%;增加周向支撑体个数,支架应力应变分别下降8.97%和31.78%;改变3个结构参数均可以有效降低支架应力应变,其中支撑体长度的影响较大。通过支架的扩张性能及力学性能分析出支架最优结构,为将来镁合金支架的设计优化提供重要参考依据。

The expansion and mechanics performance of stent was one important factors to ensure operation suc-cess.By using the finite element method （FEM）,the outer coupling expansion process of the magnesium alloys stent was simulated and analyzed.We focused the research on the change initial diameter of stent and support length and circumference direction number＆#39;s influence on the expansion and mechanics performance,explored the stent structure to optimize.The results showed with that decrease of the initial diameter of stent,its stress and strain reduced by 3.94% and 16.59% respectively;with increase of the support length of stent,its stress and strain reduced by 15.76% and 49.50% respectively;with increase of circumference direction number of sup-port,stress and strain of stent decreased by 8.97% and 31.78% respectively.Changing the three structural pa-rameters could effectively decrease the stress and strain of stent,and the support length impact was bigger.To analyze the optimal design of stent structure through its expansion performance and mechanics performance, and provide assistance for the future magnesium alloy stent optimal design.