Effects of Different Geometric Parameters on Flexibility of Z-Shaped Stent-Grafts
10.16156/j.1004-7220.2019.01.02
- VernacularTitle:几何参数对Z型覆膜支架柔顺性的影响
- Author:
Yiwen ZHAO
1
;
Shiju YAN
1
;
Yi SI
2
;
Chengli SONG
1
Author Information
1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology
2. Department of Vascular Surgery, Zhongshan Hospital Affiliated to Fudan University
- Publication Type:Journal Article
- Keywords:
stent-graft;
flexibility;
finite element analysis
- From:
Journal of Medical Biomechanics
2019;34(1):E007-E013
- CountryChina
- Language:Chinese
-
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.
