基于不同扩张模拟方式的支架优化设计

为选取一种简洁而有效的支架扩张模拟方式,用于基于有限元分析的结果对支架进行优化设计,本文选用典型的菱形支架作为算例,采用目前两种常用的支架扩张模拟方式:球囊内施加内压和球囊内施加径向位移,利用与改进的拉丁抽样法相结合的Kriging替代模型优化算法,以减小支架扩张过程中的"Dogbon-ing"效应为目的,分别对支架进行了的优化设计,得到了这两种模拟方式下的优化结果.数据结果表明,基于球囊内施加内压模拟分析的优化结果更符合现有的设计理念.

Stent optimization based on different expansion models

To find out a simple and effective stent expansion simulation method for stent optimization based on finite element analysis results,an effective optimization method using Kriging surrogate model combing with modified Latin hypercube sampling was proposed to reduce the ’Dogboning’ effect of stent in the expansion process based on the two commonly used simulation methods:(i) pressure applied on the inner surface of balloon and(ii) radial displacement applied on balloon to dilate stent.As an example,a typical diamond stent was study and two optimization results were achieved,respectively.The numerical results indicate that optimal stent based on the first simulation method has good qualitative agreement with manufacturer’s design idea.