赵艺文,闫士举,司逸,宋成利.几何参数对Z型覆膜支架柔顺性的影响[J].医用生物力学,2019,34(1):7-13
几何参数对Z型覆膜支架柔顺性的影响
Effects of Different Geometric Parameters on Flexibility of Z-Shaped Stent-Grafts
投稿时间:2018-01-17  修订日期:2018-03-08
DOI:
中文关键词:  覆膜支架  柔顺性  有限元分析
英文关键词:stent-graft  flexibility  finite element analysis
基金项目:国家自然科学基金项目(51735003)
作者单位
赵艺文 上海理工大学 医疗器械与食品学院 
闫士举 上海理工大学 医疗器械与食品学院 
司逸 上海复旦大学附属中山医院 血管外科 
宋成利 上海理工大学 医疗器械与食品学院 
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中文摘要:
      目的 分析治疗胸主动脉瘤的常用Z型覆膜支架的几何参数对支架柔顺性能的影响及主次顺序。方法 通过SolidWorks软件建立波峰数目、波峰高度、丝径及顶端圆角半径4种因素变化的覆膜支架模型,并导入ANSYS有限元软件进行仿真分析,对支架施加弯曲60°的转动变量,根据最大等效应力、节点反力、弯矩3个评价参数分析支架柔顺性。结果 支架弯曲后,最大应力集中在弯曲内侧;减小支架丝径、波峰高度与波峰数目,支架的柔顺性增强;增大波峰顶端圆弧半径,支架柔顺性增强;丝径与波峰数目对支架柔顺性的影响强于顶端圆弧半径与波峰高度。结论 波峰数目、波峰高度、丝径及顶端圆角半径对覆膜支架柔顺性均有显著影响。研究结果为以后临床支架的选择及优化设计提供理论依据,对减少新发破口等并发症的发生具有积极意义。
英文摘要:
      Objective To analyze the influence of different geometric parameters on flexibility of the commonly used Z-shaped stent-grafts for treating thoracic aortic aneurysm, as well as the primary and secondary order of such influence. Methods The three-dimensional models of the stent-grafts with different strut numbers, wire diameters, crest height, bending radius were established by SolidWorks and imported to ANSYS software for finite element analysis.The 60° rotation of X-axis was applied to the stent-grafts, and the flexibility of the stent-grafts was evaluated according to 3 evaluation parameters (Von Mises stress, reaction force and bending torque). Results After bending of the stent-grafts, the maximum stress was concentrated on the inside of the bend;reducing the wire diameter, crest height and strut number of the stent-grafts, the flexibility of the stent-grafts would increase; increasing the bending radius, the flexibility of the stent grafts would increase; the effect of the wire diameter and strut number on flexibility of the stent-grafts was stronger than that from the bending radius and crest height. Conclusions The strut number, wire diameter, crest height, bending radius had a significant impact on flexibility of the stent-grafts. The research findings can provide theoretical references for the selection and optimal design of the stent-grafts in clinic, and have a positive influence on reducing the incidence rate of complications such as new entry.
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