ZHAO Yiwen,YAN Shiju,SI Yi,SONG Chengli.Effects of Different Geometric Parameters on Flexibility of Z-Shaped Stent-Grafts[J].Journal of medical biomechanics,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
Received:January 17, 2018  Revised:March 08, 2018
DOI:
Chinese key words:  覆膜支架  柔顺性  有限元分析
English Key words:stent-graft  flexibility  finite element analysis
Fund project:国家自然科学基金项目(51735003)
Author NameAffiliation
ZHAO Yiwen School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology 
YAN Shiju School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology 
SI Yi Department of Vascular Surgery, Zhongshan Hospital Affiliated to Fudan University 
SONG Chengli School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology 
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Chinese abstract:
      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。
English abstract:
      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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