Finite element analysis of stents under radial compression boundary conditions with different material properties Yaoyao Xua , Jonathan P. Vande Geestb
a
Department of Mechanical Engineering and Material Science, Department of Bioengineering and Department of Mechanical Engineering and Material Science b
Yaoyao Xu is a mechanical engineering undergraduate at Swanson School of Engineering. Her current interests are control, finite element analysis, and computational modeling. She plans to pursue a master’s degree in control after graduation. Yaoyao Xu
Dr. Jonathan Vande Geest is a Professor in the Department of Bioengineering, Department of Mechanical Engineering and Material Science, the Department of Ophthalmology, the McGowan Institute for Regenerative Medicine, the Louis J. Fox Center for Vision Restoration, and the Vascular Medicine Institute at the Jonathan P. Vande University of Pittsburgh. He received his Geest, Ph.D. BS in Biomedical Engineering from the University of Iowa in 2000 and his PhD in Bioengineering from the University of Pittsburgh in 2005. Dr. Vande Geest began his career at the University of Arizona in the Department of Aerospace and Mechanical Engineering and joined the University of Arizona’s Department of Biomedical Engineering in 2009. Dr. Vande Geest returned to the University of Pittsburgh in January of 2016.
Significance statement
By simulating the reactions of the cardiovascular stents in-vivo with radial compression acts as the boundary conditions, the relationships between the displacements, material stiffness, and the maximum principal stress could be found, which provides references to the stent design when large deformation causes problems to the performance of the stent.
Ingenium 2021
Abstract
The purpose of this work is to begin to establish a computational testing platform to assess the compressive behavior of magnesium alloy stents. This provides references to the stent design when large deformation causes problems to the performance of the stent. According to the results, the sensitivity of peak maximum principal stress to changes in imposed displacement increased as the stiffness of the stent increased. This sensitivity became nearly linear in both stiffness and imposed displacement when these values were near their maximum imposed values.
1. Introduction
The incidence of the cardiovascular and cerebrovascular disease has become higher and higher in recent years and has become the main threat to human life and health [1]. About 80% of patients with the cerebrovascular disease have the ischemic stroke, the main cause of which is the narrowing of blood vessels [2]. A cardiac stent is used to treat narrowed or blocked coronary arteries. Stent restenosis is a major problem resulting in device and treatment failure and often requires subsequent reintervention. The method of finite elements analyzes the structural characteristics that affect the support strength and safety of vascular stents. Through mechanical simulation and numerical study of the releasing and operating process of vascular stents in the stenosis model, the relevant factors that influence the effect of stent expansion can be identified, which can be provided to the physician when using stent implantation as a valuable reference. Previous research has found that restenosis within balloon-expandable endovascular stents may occur as a result of radial compression [3], and radial compression acts as one of the common boundary conditions for cardiovascular stents in-vivo [4]. Based on Hooke’s law, we assume that the maximum principal stress of the stent is inversely proportional to material stiffness with the same displacement, and as the displacement increases, the stress will also increase. The purpose of this work is to begin to establish a computational testing platform to assess the compressive behavior of magnesium alloy stents. This provides references to the stent design when large deformation causes problems to the performance of the stent.
Category: Computational Research Keywords: Simulation, Stent, Abaqus, Radial compression, Stiffness
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