Renal Artery Stent Bending Fatigue Analysis

[+] Author and Article Information
H. M. Hsiao, S. Prabhu, A. Nikanorov

 Abbott Laboratories, Vascular Solutions, 3200 Lakeside Drive, Santa Clara, CA 95054

M. Razavi

 St. Joseph Vascular Institute, Center for Clinical Trials and Research, 1100 West Stewart Drive, Orange, CA 92868

J. Med. Devices 1(2), 113-118 (Sep 13, 2006) (6 pages) doi:10.1115/1.2736396 History: Received February 27, 2006; Revised September 13, 2006

During normal breathing, the kidneys move up and down due to the diaphragm motion and the renal artery subsequently experiences bending. Whether bending of the renal artery during respiration impacts stent bending fatigue was not previously known. This study presents the first evaluation of the effect of the kidney movement on renal stent bending fatigue performance. Measurements of fluoroscopic images demonstrated a minor (1.7deg) change in bending angle between inspiration and expiration for an 18mm long renal stent after removing rigid-body motion. Finite element analysis revealed excellent fatigue resistance of the studied renal stent under simulated respiratory motion.

Copyright © 2007 by American Society of Mechanical Engineers
Topics: Kidney , stents , Fatigue
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Figure 1

Angiographic images showing kidney and renal artery motion during respiration: (a) Expiration and (b) inspiration

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Figure 2

Simulation of the kidney and stented renal artery motion during respiration cycle

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Figure 3

Explanted and opened aortic segment with the left renal artery showing implanted stent

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Figure 4

Fluoroscopic images of stented renal arteries at simulated respiration positions: (a) Expiration and (b) inspiration

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Figure 5

(a) Deformations of a stent in bending and (b) measured acute intersection angle 2θ (or θ+ϕ for nonuniform bending) at inspiration

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Figure 6

Contours of von Mises stress for the studied renal stent after crimping

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Figure 7

Contours of von Mises stress for the studied renal stent after expansion

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Figure 8

Contours of von Mises stress for the studied renal stent after bending: (a)3.9deg bending with systolic pressure loading and (b)2.2deg bending with diastolic pressure loading

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Figure 9

Zoom-in contour plots of Fig. 8: (a) Maximum strain contour plot at strut U and (b) maximum stress contour plot at strut W

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Figure 10

Goodman diagram for the studied renal stent under bending fatigue

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Figure 11

Goodman diagram for the modified renal stent under bending fatigue




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