School of Engineering, University of Limerick, Ireland; Bernal Institute, University of Limerick, Ireland.
School of Natural Sciences, University of Limerick, Ireland; Bernal Institute, University of Limerick, Ireland.
J Mech Behav Biomed Mater. 2017 Nov;75:581-591. doi: 10.1016/j.jmbbm.2017.08.025. Epub 2017 Aug 24.
The present study has two major purposes: firstly, to investigate whether the analytical model proposed by Jedwab and Clerc for assessing the mechanical behaviour of an open ends metallic braided stent is applicable to the looped ends stent design and secondly, to compare the response of the two stent designs subjected to radial compression. We use finite element analysis to evaluate the performance of the two braided stents emulating well established designs: WALLSTENT and WallFlex. We validate the WALLSTENT model analytically. We perform a radial crimping simulation and evaluate the radial forces and stresses induced. This study confirms the validity of using the analytical model in the biomechanical analysis of the WALLSTENT design. However, in case of the WallFlex design, a major difference in the results can be observed in the levels of radial forces and wire peak stresses, justifying the decision of using a different alloy in the fabrication of the WallFlex design.
首先，研究 Jedwab 和 Clerc 提出的用于评估开口端金属编织支架力学行为的分析模型是否适用于环端支架设计；其次，比较两种支架设计在径向压缩下的响应。我们使用有限元分析来评估两种编织支架的性能，模拟了经过充分验证的设计：WALLSTENT 和 WallFlex。我们对 WALLSTENT 模型进行了分析验证。我们进行了径向卷曲模拟，并评估了所产生的径向力和应力。本研究证实了在 WALLSTENT 设计的生物力学分析中使用分析模型的有效性。然而，在 WallFlex 设计的情况下，在径向力和线材峰值应力水平上可以观察到显著差异，这证明了在制造 WallFlex 设计时使用不同合金的决策是合理的。
