轴向缩短性是个性化冠脉支架很重要的一个力学性能，它决定了支架长度的选用及定位的精确度。以个性化冠脉支架为研究对象，利用有限元方法研究它的设计参数及膨胀直径对轴向缩短性的影响。结果显示，L型支架缩短性最好，M型支架缩短性最差；支架波形环高度和膨胀直径对轴向缩短性的影响比较显著，增加波形环高度能够降低支架缩短率，但是，增加支架的膨胀直径却会提高支架的缩短率；此外，支架的筋宽、筋厚、波形环曲率半径、连接杆长度对缩短性虽有一点影响，但影响甚微。因此，有限元法对个性化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作用。
Foreshortening is an important property of customized coronary stents, deciding the choice of stent and precise positioning of stent length. The primary aim of this investigation was to investigate the effects of varying customized stent "design parameter" and expansion diameter on the foreshortening of stent by using the finite element method (FEM). The results show that L-stent forshortening was the best and the M-stent the worst. The amplitude and expansion diameter are decreases forshortening rate. However, increasing the dominant parameter in this study. Increasing amplitude expansion of stent increases forshortening rate of stent. Be- sides, strut thickness, strut width, amplitude or radius of curvature and the length of link influence the forshortening hardly. In conclusion, FEM can quantify some mechanical behaviors of stent and help surgeons to select stent and designers to optimize stent.
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