Design and Finite Element Analysis of a Novel Retrievable Vascular Stent
10.16156/j.1004-7220.2021.03.14
- VernacularTitle:新型可回收血管支架的设计与有限元分析
- Author:
Jingzhen GUO
1
;
Chengli SONG
1
;
Lin MAO
1
Author Information
1. Modern Minimally Invasive Medical Devices and Technology Engineering Research Center, Ministry of Education, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology
- Publication Type:Journal Article
- Keywords:
retrievable vascular stent;
drug-eluting stent (DES);
retrieval system;
retrieval process
- From:
Journal of Medical Biomechanics
2021;36(3):E384-E388
- CountryChina
- Language:Chinese
-
Abstract:
Objective In order to avoid early restenosis after drug-eluting stent (DES) implantation, the retrievable structure of the NiTi alloy stent and its biomechanical analysis were studied. Methods The geometric models of the retrievable vascular stent and the retrieval system were established. The retrieval part of the stent consisted of four symmetrically distributed tendons, which were designed as circular meshes. The distribution of the maximum strain during stent compression and its uniformity during compression and self-expansion were analyzed, and the simulation experiments of the retrieval process were also performed. Results The maximum strain of the stent was 3.7% and the index of non-uniformity (INU) was 0.62% when the stent was compressed to the minimum size. While the IBU was 1.31% after the self-expansion process completed. The maximum strain was 1.2% when half of the stent was retrieved into the outer sheath. Conclusions The stent could be safely and successfully retrieved into the outer sheath as the strain was within the bearable range of the material and the compression and self-expansion process was relatively uniform. The research findings provide important references for structural design, biomechanical analysis and potential clinical applications of the novel retrievable vascular stent.
