Effects of Stent Design Parameters on Normal Artery Wall MechanicsSource: Journal of Biomechanical Engineering:;2006:;volume( 128 ):;issue: 005::page 757DOI: 10.1115/1.2246236Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A stent is a device designed to restore flow through constricted arteries. These tubular scaffold devices are delivered to the afflicted region and deployed using minimally invasive techniques. Stents must have sufficient radial strength to prop the diseased artery open. The presence of a stent can subject the artery to abnormally high stresses that can trigger adverse biologic responses culminating in restenosis. The primary aim of this investigation was to investigate the effects of varying stent “design parameters” on the stress field induced in the normal artery wall and the radial displacement achieved by the stent. The generic stent models were designed to represent a sample of the attributes incorporated in present commercially available stents. Each stent was deployed in a homogeneous, nonlinear hyperelastic artery model and evaluated using commercially available finite element analysis software. Of the designs investigated herein, those employing large axial strut spacing, blunted corners, and higher amplitudes in the ring segments induced high circumferential stresses over smaller areas of the artery’s inner surface than all other configurations. Axial strut spacing was the dominant parameter in this study, i.e., all designs employing a small stent strut spacing induced higher stresses over larger areas than designs employing the large strut spacing. Increasing either radius of curvature or strut amplitude generally resulted in smaller areas exposed to high stresses. At larger strut spacing, sensitivity to radius of curvature was increased in comparison to the small strut spacing. With the larger strut spacing designs, the effects of varying amplitude could be offset by varying the radius of curvature and vice versa. The range of minimum radial displacements from the unstented diastolic radius observed among all designs was less than 90μm. Evidence presented herein suggests that stent designs incorporating large axial strut spacing, blunted corners at bends, and higher amplitudes exposed smaller regions of the artery to high stresses, while maintaining a radial displacement that should be sufficient to restore adequate flow.
keyword(s): Stress , Struts (Engineering) , Design AND stents ,
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contributor author | Julian Bedoya | |
contributor author | Clark A. Meyer | |
contributor author | Lucas H. Timmins | |
contributor author | Michael R. Moreno | |
contributor author | James E. Moore | |
date accessioned | 2017-05-09T00:18:52Z | |
date available | 2017-05-09T00:18:52Z | |
date copyright | October, 2006 | |
date issued | 2006 | |
identifier issn | 0148-0731 | |
identifier other | JBENDY-26616#757_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/133164 | |
description abstract | A stent is a device designed to restore flow through constricted arteries. These tubular scaffold devices are delivered to the afflicted region and deployed using minimally invasive techniques. Stents must have sufficient radial strength to prop the diseased artery open. The presence of a stent can subject the artery to abnormally high stresses that can trigger adverse biologic responses culminating in restenosis. The primary aim of this investigation was to investigate the effects of varying stent “design parameters” on the stress field induced in the normal artery wall and the radial displacement achieved by the stent. The generic stent models were designed to represent a sample of the attributes incorporated in present commercially available stents. Each stent was deployed in a homogeneous, nonlinear hyperelastic artery model and evaluated using commercially available finite element analysis software. Of the designs investigated herein, those employing large axial strut spacing, blunted corners, and higher amplitudes in the ring segments induced high circumferential stresses over smaller areas of the artery’s inner surface than all other configurations. Axial strut spacing was the dominant parameter in this study, i.e., all designs employing a small stent strut spacing induced higher stresses over larger areas than designs employing the large strut spacing. Increasing either radius of curvature or strut amplitude generally resulted in smaller areas exposed to high stresses. At larger strut spacing, sensitivity to radius of curvature was increased in comparison to the small strut spacing. With the larger strut spacing designs, the effects of varying amplitude could be offset by varying the radius of curvature and vice versa. The range of minimum radial displacements from the unstented diastolic radius observed among all designs was less than 90μm. Evidence presented herein suggests that stent designs incorporating large axial strut spacing, blunted corners at bends, and higher amplitudes exposed smaller regions of the artery to high stresses, while maintaining a radial displacement that should be sufficient to restore adequate flow. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effects of Stent Design Parameters on Normal Artery Wall Mechanics | |
type | Journal Paper | |
journal volume | 128 | |
journal issue | 5 | |
journal title | Journal of Biomechanical Engineering | |
identifier doi | 10.1115/1.2246236 | |
journal fristpage | 757 | |
journal lastpage | 765 | |
identifier eissn | 1528-8951 | |
keywords | Stress | |
keywords | Struts (Engineering) | |
keywords | Design AND stents | |
tree | Journal of Biomechanical Engineering:;2006:;volume( 128 ):;issue: 005 | |
contenttype | Fulltext |