Effects of strut numbers on biomechanical properties of Z-shaped stent-grafts
10.16156/j.1004-7220.2017.02.003
- VernacularTitle:波峰数目对Z型覆膜支架生物力学性能影响
- Author:
Kai YU
1
;
Xue-Lian GU
;
Fang-Qiu HU
;
Zhong-Hua LI
;
Cheng-Li SONG
Author Information
1. 上海理工大学现代微创医疗器械及技术教育部工程研究中心
- Keywords:
Z-shaped stent-grafts;
Strut numbers;
Finite element analysis;
Biomechanics
- From:
Journal of Medical Biomechanics
2017;32(2):115-121
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the influence from strut numbers on biomechanical properties of Z-shaped stentgrafts,especially on their radial support performance and flexibility,so as to provide theoretical support for the design and clinical selection of Z-shaped stent-grafts.Methods Z-shaped stent-grafts with 5,8,10,12 struts were established by finite element method to simulate the process of compression and bending behavior.Radial displacements were applied on surface of the stent-graft and opposite rotations were applied around the z-axis,until a bending angle of 40° was reached.Then parameters such as stent stress,radial support force,strains in graft,cross-section deflection,bending torque were extracted to evaluate the performance of different stentgrafts.Results Compared with stent-grafts with more strut numbers,5-strut stent-graft showed a better radial support performance with the maximum radial force during compression,and it also generated the smallest 68 N · mm torque and 67.5％ cross-section deflection.The tensile strain in graft of 5-strut stent-graft during the process of bending was relatively smaller.Conclusions The strut number of Z-shaped stent-grafts has a significant influence on biomechanical properties of the stent-grafts.Especially the Z-shaped stent-graft with relatively fewer strut numbers shows an advantage in evaluating radial support performance and flexibility such as the bending torque and the cross-section deflection,and is more suitable to be anchored and fit to the tortuous blood vessel,which will play a positive role in decreasing the complication such as endoleaks and thrombosis.The research findings can guide structure design of Z-shaped stent-grafts and optimal selection for surgery.
