Vol. 15, No. 1, 2020

Download this article
Download this article For screen
For printing
Recent Issues

Volume 15
Issue 3, 291–434
Issue 2, 185–289
Issue 1, 1–184

Volume 14, 5 issues

Volume 13, 5 issues

Volume 12, 5 issues

Volume 11, 5 issues

Volume 10, 5 issues

Volume 9, 5 issues

Volume 8, 8 issues

Volume 7, 10 issues

Volume 6, 9 issues

Volume 5, 6 issues

Volume 4, 10 issues

Volume 3, 10 issues

Volume 2, 10 issues

Volume 1, 8 issues

The Journal
About the Journal
Editorial Board
Subscriptions
Scientific Advantage
Submission Guidelines
Submission Form
Ethics Statement
ISSN: 1559-3959
Author Index
To Appear
 
Other MSP Journals
Effect of number of crowns on the crush resistance in open-cell stent design

Gideon Praveen Kumar, Keping Zuo, Li Buay Koh, Chi Wei Ong, Yucheng Zhong, Hwa Liang Leo, Pei Ho and Fangsen Cui

Vol. 15 (2020), No. 1, 75–86
Abstract

Our group is developing novel preferential covered carotid stents aimed at preventing friable parts from atherosclerotic plaques from dislodging into the cerebral blood flow, and also preserving external carotid artery (ECA) perfusion through slits on the membrane. Enhanced ECA flow rates can be achieved by designing bare metal stents with larger cells that can accommodate more slits for enhanced blood flow to the ECA where the stents have fewer crowns in the circumferential direction. The general perception is that the stent stiffness and thereby the crush resistance will decrease with fewer crowns in the circumferential direction. However, we observed the opposite effect. To study the effect of crown number on crush resistance of stents, finite element analysis (FEA) was used to evaluate the crush resistance of open-cell stent designs by varying the number of crowns. From FEA simulation results, it was found that the crush resistance of the open-cell stent design actually increases with fewer crowns. To verify this effect, three stent designs with different crown numbers were fabricated and subjected to crush resistance experimental testing. The experimental testing further confirmed the effect observed by FEA. Finally, a simplified analytical model was proposed to explain why the crush resistance of stent increases with a reduction in the number of stent crowns. From this study, we can infer that the stent’s crush resistance increases with reduction in the number of stent crowns in the circumferential direction.

Keywords
stent crown, nitinol, membrane, carotid, stent crush resistance finite element analysis
Milestones
Received: 11 June 2019
Revised: 16 December 2019
Accepted: 20 December 2019
Published: 26 February 2020
Authors
Gideon Praveen Kumar
Institute of High Performance Computing
Singapore 138632
Singapore
Keping Zuo
National University of Singapore
Singapore 119077
Singapore
Li Buay Koh
National University of Singapore
Singapore 119077
Singapore
Chi Wei Ong
National University of Singapore
Singapore 119077
Singapore
Yucheng Zhong
Institute of High Performance Computing
Singapore 138632
Singapore
Hwa Liang Leo
National University of Singapore
Singapore 119077
Singapore
Pei Ho
National University of Singapore
Singapore 119077
Singapore
Fangsen Cui
Institute of High Performance Computing
Singapore 138632
Singapore