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A computational study of fatigue resistance of nitinol stents subjected to walk‐induced femoropopliteal artery motion
journal contribution
posted on 2021-02-12, 11:44 authored by Ran He, Liguo Zhao, Vadim SilberschmidtVadim Silberschmidt, Helen WillcockHelen WillcockFatigue 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
Find out more...History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Journal of BiomechanicsVolume
118Publisher
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
2021-01-23Publication date
2021-02-04Copyright date
2021ISSN
0021-9290Publisher version
Language
- en