SIMULATION SUCCESS STORIES
Boston Scientific Simulates Release Mechanisms in Drug-Eluting Stents
T. Schauer, I. Guler
Boston Scientific Corporation, MN, USA
穿过冠状动脉置入支架是用于治疗由动脉狭窄而限制血液向心脏流动的常用解决方法。按照这种方法操作时,由于组织会在支架上过度生长可能会出现再狭窄现象。Boston Scientific 的研究人员正在使用多物理场仿真来更好地了解药物洗脱支架如何防止组织再生,从而进一步改进他们的设计。 研究人员在 COMSOL Multiphysics 软件中建立了一个用于药物控释并进入周围组织的支架涂层模型。在他们的模型中,可以使用刚性弹簧法,确保孔隙和壳层之间界面处的药物扩散通量的连续性。优化模块用于改良不能通过实验确定的模型参数,比如聚合物壳层的厚度和在支架涂层中孔隙的延迟系数。仿真和实验数据都证实了通过孔隙的快速释放机理和通过壳层中聚合物包封剂的慢速扩散。
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