基于有限元模拟的支架扩张、血流动力学及支架疲劳分析

发布时间：2018-07-27 21:25

【摘要】：目的利用有限元方法研究支架在狭窄血管内的扩张性能、支架内血流动力学状况和支架的疲劳寿命。方法采用ANSYS模拟支架在狭窄血管内的扩张过程,提取扩张后相关节点数据,建立血流动力学分析模型,并建立与之对应的简化模型,模拟分析支架内血流动力学状况。分别基于Goodman图表和累计损伤法,对支架的疲劳寿命进行评估。结果 (1)支架上绝大部分部位发生塑性变形,主要应力发生在镂空孔的角点。(2)支架附近流动紊乱,血流流入端的桥接支柱附近应力最高。(3)Goodman图表法表明该支架是安全的,累计损伤法表面支架在血流流入端桥接支柱所在的第2个横截面上累计损伤最大。结论有限元方法能有效地应用于支架扩张、支架内血流动力学以及支架的疲劳模拟仿真。
[Abstract]:Objective to study the dilatancy, hemodynamics and fatigue life of stent by finite element method. Methods ANSYS was used to simulate the dilatation process of stent in the stenotic vessel. The data of relevant nodes after dilatation were extracted, and the hemodynamic analysis model was established, and the corresponding simplified model was established to simulate and analyze the hemodynamic status in the stent. The fatigue life of the support was evaluated based on Goodman diagram and cumulative damage method. Results (1) plastic deformation occurred in most parts of the scaffold, and the main stress occurred at the corner of the hollow hole. (2) the flow around the stent was disordered, and the stress near the bridge support at the blood flow inflow end was the highest. (3) the Goodman chart method showed that the scaffold was safe. The cumulative damage of the surface scaffold was the largest on the second cross section of the bridge support at the inflow end of the blood flow. Conclusion finite element method can be used to simulate stent dilatation, hemodynamics and fatigue simulation.
【作者单位】：大连理工大学运载工程与力学学部工业装备结构分析国家重点实验室;
【基金】：国家自然科学基金资助项目(11072048) 国家重点基础研究发展计划973项目基金(2009CB918501)
【分类号】：R318.01

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