【摘要】 冠状动脉支架作为经皮穿刺冠状动脉成形术中保持病变血管畅通的核心器件,其低的弹性回弹性能已作为新一代冠脉支架所应具有的重要力学特征。依据冠脉支架回弹性能的实际测试原型,建立了具有代表性的通用支架有限元模型,并利用此方法研究了冠脉支架设计参数对支架弹性回弹性能的影响。结果显示,支架波形环高度和花冠数在所有研究参数中对回弹性的影响最为显著,增加支架筋宽或者筋厚通常能够降低支架回弹率,但是,增加支架波形环高度或者波形环曲率半径通常会提高支架回弹率。此外,增加支架花冠数也会提高支架的回弹率。因此,有限元法对支架力学行为分析具有很大的帮助,为支架的临床选择及优化设计提供了重要指导。更多还原

【Abstract】 Coronary stent is an important device used in percutaneous transluminal coronary angioplasty(PTCA),which is usually implanted to support the stenosed artery.Low elastic recoil has become an essential feature of new coronary stents.The primary aim of this investigation was to investigate the effects of varying stent "design parameter" on the elastic recoil of stent by using the finite element method(FEM).The finite element model to evaluate elastic recoil of stent was set up based on the stent prototype testing.The results showed that the amplitude and the number of crowns were the dominant parameter in this study.Increasing either strut width or thickness generally decreased elastic recoil of stent.However,increasing either amplitude or radius of curvature or the number of crowns generally increased it.In conclusion,FEM could quantify some mechanical behaviors of stent and help surgeons to select stent and designers to optimize stent.更多还原