Accepted AS paper MSCE.pdf (2.01 MB)
Download file

Effects of material, coating, design and plaque composition on stent deployment inside a stenotic artery-finite element simulation

Download (2.01 MB)
journal contribution
posted on 11.03.2015, 11:23 by Alessandro Schiavone, Liguo ZhaoLiguo Zhao, Adel A. Abdel-Wahab
Finite-element simulations have been carried out to study the effects of material choice, drug eluting coating and cell design on the mechanical behaviour of stents during deployment inside a stenotic artery. Metallic stents made of materials with lower yield stress and weaker strain hardening tend to experience higher deformation and stronger dogboning and recoiling, but less residual stresses. Drug eluting coatings have limited effect on stent expansion, recoiling, dogboning and residual stresses. Stent expansion is mainly controlled by the radial stiffness of the stent which is closely associated with the stent design. In particular, open-cell design tends to have easier expansion and higher recoiling than closed-cell design. Dogboning is stronger for slotted tube design and open-cell sinusoidal design, but reduced significantly for designs strengthened with longitudinal connective struts. After deployment, the maximum von Mises stress appears to locate at the U-bends of stent cell struts, with varying magnitude that depends on the materials and severity of plastic deformation. For the artery–plaque system, the stresses, especially in the plaque which is in direct contact with the stent, appear to be distinctly different for different stent designs and materials in terms of both distribution and magnitude. The plaque composition also strongly affects the expansion behaviour of the stent–artery system and modifies the stresses on the plaque.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials Science and Engineering: C

Volume

42

Pages

479 - 488

Citation

SCHIAVONE, A., ZHAO, L. and ABDEL-WAHAB, A.A., 2014. Effects of material, coating, design and plaque composition on stent deployment inside a stenotic artery-finite element simulation. Materials Science and Engineering: C, 42, pp.479-488.

Publisher

© Elsevier B.V.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

29/05/2014

Publication date

2014-06-05

Copyright date

2014

Notes

This definitive published version of this article is available from: http://dx.doi.org/10.1016/j.msec.2014.05.057

ISSN

0928-4931

Language

en