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首页> 外文会议>Proceedings of the 17th IASTED international conference on robotics applications ; Proceedings of the 11th IASTED international conference on biomedical engineering >DESIGN OF RETINAL STENT USING FINITE ELEMENT ANALYSIS
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DESIGN OF RETINAL STENT USING FINITE ELEMENT ANALYSIS

机译：基于有限元分析的视网膜支架设计

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摘要

The motivation for the herein presented research stems from a new retinal reattachment procedure, which consists of carefully pressing the detached retina tissue into place via a shape memory alloy (SMA) and self-expanding stent. The initial study described in this article focused on modeling the mechanical interaction among stent and neighboring human eyeball tissues: retina, choroid and sclera. The study was performed via finite element analysis (FEA). The tissues were modeled with either hyperelastic or linear elastic material models in order to predict strain distributions on retina and the rest of the eye tissues due to stent placement. The FEA model included the following eyeball tissue: retina, choroid, sclera, cornea, zonular fibres, lens, and ciliary muscle. The simulations, shown for a sample stent configuration, have shown that the strain distribution developed due to stent placement was below levels which would induce permanent retina damage at the stent location. The simulations have shown that, by assuming that the retina was subjected to physiological internal ocular pressure (16.5 mmHg) in parallel to stent pressure (2200 Pa), the retinal strain reached a maximum of 2.67% , which was below a permanent damage strain threshold of 3.3%.
机译：本文提出的研究动机来自于一种新的视网膜重新附着程序，该程序包括通过形状记忆合金（SMA）和自扩张支架将分离的视网膜组织小心地压入适当位置。本文所述的初步研究重点在于对支架与邻近的人眼球组织（视网膜，脉络膜和巩膜）之间的机械相互作用进行建模。该研究是通过有限元分析（FEA）进行的。用超弹性或线性弹性材料模型对组织进行建模，以预测由于支架放置而在视网膜和其余眼组织上的应变分布。 FEA模型包括以下眼球组织：视网膜，脉络膜，巩膜，角膜，小带纤维，晶状体和睫状肌。针对样本支架配置所显示的模拟表明，由于支架放置而产生的应变分布低于会在支架位置引起永久性视网膜损伤的水平。模拟表明，通过假设视网膜在与支架压力（2200 Pa）平行的同时受到生理性内部眼压（16.5 mmHg），视网膜应变最大达到2.67％，低于永久性损伤应变阈值3.3％。

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