Mechanical Characteristics Of Novel Polyester/NiTi Wires Braided Composite Stent For The Medical Application
Authors: Qiuhua Zou, Wen Xue, Jing Lin, Yijun Fu, Guoping Guan, Fujun Wang, Lu Wang
Abstract
Stents have been widely used in percutaneous surgery to treat stenosis diseases. The braided NiTi stent, as a promising prototype, still has limitations of low radial force and loose structure. In the present study, a newly integrated composite stent was designed and braided with NiTi wires and polyester multifilament yarns by textile technology. The mechanical properties of four composite stents and the control bare NiTi stent were evaluated by in vitro compression, bending and anti-torsion tests. The results showed that integrated polyester/NiTi composite stents were superior in radial support. The stents could keep patency even when highly curved and had lower stent straightening force. Composite stents with certain structure stayed stable under twisting. The configuration of NiTi wires in composite stents could significantly impact stent deformation under twisting.
Keywords
Vascular stent; Mechanical performance; Compression; Bending; Torsion
Citation: Qiuhua Zou, Wen Xue, Jing Lin, Yijun Fu, Guoping Guan, Fujun Wang, Lu Wang Mechanical Characteristics Of Novel Polyester/NiTi Wires Braided Composite Stent For The Medical Application doi:10.1016/j.rinp.2016.07.007
Received: 8 January 2016, Accepted: 15 July 2016, Available online: 3 August 2016
Copyright: © 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Conclusions
In the present study, it could be proved that it is feasible to fabricate composite stents by braiding polyester multifilament yarns together with NiTi wires. Compared with the bare braided metal stents, the composite stents displayed higher radial force and lower stent straightening force. These composite stents possessed stable framework and prominent axial flexibility, providing alternative configurations for different anatomies. Based on the in vitro tentative mechanical study, the results above could be proved by further investigation using finite element techniques and clinical trials.
Acknowledgements
This project is supported by 111 Project (No. B07024), the Shanghai Construction of College Experiment Technique Team Project (101-07-0053014), and the Fundamental Research Funds for the Central Universities (grant Nos. 2015042, 15D110126).
