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A computational study of fatigue resistance of nitinol stents subjected to walk‐induced femoropopliteal artery motion

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Fatigue resistance of nitinol stents implanted in femoropopliteal arteries is a critical issue because of their harsh biomechanical environment. Limb flexions due to daily walk expose the femoropopliteal arteries and, subsequently, the implanted stents to large cyclic deformations, which may lead to fatigue failure of the smart self-expandable stents. For the first time, this paper utilised the up-to-date measurements of walk-induced motion of a human femoropopliteal artery to investigate the fatigue behaviour of nitinol stent after implantation. The study was carried out by modelling the processes of angioplasty, stent crimping, self-expansion and deformation under diastolic-systolic blood pressure, repetitive bending, torsion and axial compression as well as their combination. The highest risk of fatigue failure of the nitinol stent occurs under a combined loading condition, with the bending contributing the most, followed by compression and torsion. The pulsatile blood pressure alone hardly causes any fatigue failure of the stent. The work is significant for understanding and improving the fatigue performance of nitinol stents through innovative design and procedural optimisation.

Funding

Smart Peripheral Stents for the Lower Extremity - Design, Manufacturing and Evaluation

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Biomechanics

Volume

118

Publisher

Elsevier Ltd.

Version

VoR (Version of Record)

Rights holder

© 2021 The Author(s)

Publisher statement

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)

Acceptance date

23/01/2021

Publication date

2021-02-04

Copyright date

2021

ISSN

0021-9290

Language

en

Depositor

Prof Liguo Zhao Deposit date: 29 January 2021

Article number

110295