Bending Analysis of Stented Coronary Artery: the Interaction Between Stent and Vessel

Vessel flexure can be triggered naturally by surgical operation, heart pulsation and body movement. It may affect the mechanical behavior of the stent and the existence of a stent may in turn cause vessel injury. In the present study, the finite element method is employed to study the interaction be...

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Bibliographic Details
Published inJournal of mechanics Vol. 35; no. 4; pp. 455 - 463
Main Authors Shen, X., Deng, Y. Q., Ji, S., Zhu, H. F., Jiang, J. B., Gu, L. X.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.08.2019
Oxford University Press
Subjects
Austenitic stainless steels
Bending
Blood vessels
Deformation
Finite element method
Flexing
Longitude
Magnesium base alloys
Mechanical properties
Stents
Stress concentration
Struts
Surgical implants
Stent design
Finite element analysis
Vessel flexure
Flexibility
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Summary:Vessel flexure can be triggered naturally by surgical operation, heart pulsation and body movement. It may affect the mechanical behavior of the stent and the existence of a stent may in turn cause vessel injury. In the present study, the finite element method is employed to study the interaction between stent and vessel during vessel flexure. Two- and four-link stents made of stainless steel 316L and magnesium alloy WE43 are considered. Results indicate that longitudinal deformation of the stent can be caused by vessel flexure, and the higher levels of stress exist in the link struts. The existence of the stent could induce significant stress concentration and straightened deformation on vessel wall in the course of vessel flexure. Stents with more links or made of harder materials show greater anti-deformation capability, thus inducing a more severe stress concentration and straightened deformation on the vessel wall. The bending direction also affects the mechanical performance of the vessel-stent system. The results obtained could provide useful information for better stent designs and clinical decisions.
ISSN:1727-7191
1811-8216
DOI:10.1017/jmech.2018.23