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Study on Flexibility of Intracranial Vascular Stents Based on the Finite Element Method

Published online by Cambridge University Press:  28 August 2018

L. Liu ,
H. Jiang ,
Y. Dong ,
L. Quan  and
Y. Tong
L. Liu*
Affiliation:
Jiangsu Provincial Key Laboratory for Interventional Medical Devices Huaiyin Institute of Technology Huaian, China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing, China
H. Jiang
Affiliation:
Faculty of Mechanical & Material Engineering Huaiyin Institute of Technology Huaian, China
Y. Dong
Affiliation:
Faculty of Mechanical & Material Engineering Huaiyin Institute of Technology Huaian, China
L. Quan
Affiliation:
Faculty of Mechanical & Material Engineering Huaiyin Institute of Technology Huaian, China
Y. Tong
Affiliation:
School of Mechanical Engineering Nanjing University of Science and Technology Nanjing, China
*
* Corresponding author (llhyit@hyit.edu.cn)
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Abstract

Flexibility is a particularly important biomechanical property for intracranial vascular stents. To study the flexibility of stent, the following work was carried out by using the finite element method: Four mechanical models were adopted to simulate the bending deformation of stents, and comparative studies were conducted about the distinction between cantilever beam and simply supported beam, as well as the distinction between moment-loading method and displacement-loading method. A complete process as implanting a stent including compressing, expanding and bending was also simulated, for analyzing the effects of compressing and expanding deformation on stent flexibility. At the same time, the effects of the arrangement and the number of bridges on stent flexibility were researched. The results show that: 1. A same flexibility index was obtained from cantilever beam model and simply supported beam model; displacement-loading method is better than moment-loading for simulating the bending deformation of stents. 2. The flexibility of stent with compressing and expanding deformation is lower than that in the initial form. 3. Crossly arranging the neighboring bridges in axial direction, can effectively improve the stent flexibility and reduce the flexibility difference in various bending directions; the bridge number, has proportional non-linear correlation with the stent rigidity as well as the maximum moment required for bending the stent.

Keywords

Finite elementIntracranial vascular stentsFlexibilityBridges
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 4 , August 2019 , pp. 465 - 474
Copyright
© The Society of Theoretical and Applied Mechanics 2018 

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