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contributor authorJulian Bedoya
contributor authorClark A. Meyer
contributor authorLucas H. Timmins
contributor authorMichael R. Moreno
contributor authorJames E. Moore
date accessioned2017-05-09T00:18:52Z
date available2017-05-09T00:18:52Z
date copyrightOctober, 2006
date issued2006
identifier issn0148-0731
identifier otherJBENDY-26616#757_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/133164
description abstractA 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.
publisherThe American Society of Mechanical Engineers (ASME)
titleEffects of Stent Design Parameters on Normal Artery Wall Mechanics
typeJournal Paper
journal volume128
journal issue5
journal titleJournal of Biomechanical Engineering
identifier doi10.1115/1.2246236
journal fristpage757
journal lastpage765
identifier eissn1528-8951
keywordsStress
keywordsStruts (Engineering)
keywordsDesign AND stents
treeJournal of Biomechanical Engineering:;2006:;volume( 128 ):;issue: 005
contenttypeFulltext


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