Salemizadehparizi Fatemeh, Mehrabi Reza
Biomedical Engineering Department, Binghamton University, Binghamton, New York, USA.
Mechanical Engineering Department, Vali-e-Asr University of Rafsanjan, Rafsanjan, Kerman, Iran.
Comput Methods Biomech Biomed Engin. 2022 Oct;25(13):1520-1530. doi: 10.1080/10255842.2021.2019714. Epub 2021 Dec 30.
Finite element simulation is used to analysis stent designs, extension as well as interaction between a stent and a vessel. In this paper, two different stents with different geometries have been simulated. One is Zilver stent and the other one is Navalis stent. The aim of this study is to determine the effect of stents deployment with various designs that are made of shape memory alloy (SMA) on the distribution of vessel wall stresses by using computational modeling approach. The constitutive model which described the behavior of SMA is based on Microplane model. In addition, SMA stents have been simulated under torsion loading to compare the flexibility of various designs under different conditions. The superelastic behavior and shape memory effect of SMA stents are investigated in this paper. The numerical simulation results show the different geometries of stents have significant effect on the arterial wall. The results show the Navalis stent causes less stress on the arterial wall and it is more flexible than the Zilver stent under the same torsion loading.
有限元模拟用于分析支架设计、扩展以及支架与血管之间的相互作用。在本文中，对两种具有不同几何形状的不同支架进行了模拟。一种是Zilver支架，另一种是Navalis支架。本研究的目的是通过使用计算建模方法，确定由形状记忆合金（SMA）制成的各种设计的支架展开对血管壁应力分布的影响。描述SMA行为的本构模型基于微平面模型。此外，对SMA支架在扭转载荷下进行了模拟，以比较不同条件下各种设计的柔韧性。本文研究了SMA支架的超弹性行为和形状记忆效应。数值模拟结果表明，支架的不同几何形状对动脉壁有显著影响。结果表明，在相同的扭转载荷下，Navalis支架对动脉壁造成的应力较小，并且比Zilver支架更具柔韧性。
