Migration of stent-grafts (SGs) after endovascular aneurysm repair of abdominal aortic aneurysms is a serious complication that may require secondary intervention. Experimental, analytical, and computational studies have been carried out in the past to understand the factors responsible for migration. In an experimental setting, it can be very challenging to correctly capture and understand the interaction between a SG and an artery. Quantities such as coefficient of friction (COF) and contact pressures that characterize this interaction are difficult to measure using an experimental approach. This behavior can be investigated with good accuracy using finite element modeling. Although finite element models are able to incorporate frictional behavior of SGs, the absence of reliable values of coefficient of friction make these simulations unreliable. The aim of this paper is to demonstrate a method for determining the coefficients of friction of a self-expanding endovascular stent-graft. The methodology is demonstrated by considering three commercially available self-expanding SGs, labeled as , , and . The SGs were compressed, expanded, and pulled out of polymeric cylinders of varying diameters and the pullout force was recorded in each case. The SG geometries were recreated using computer-aided design modeling and the entire experiment was simulated in ABAQUS 6.8/STANDARD. An optimization procedure was carried out for each SG oversize configuration to determine the COF that generated a frictional force corresponding to that measured in the experiment. The experimental pullout force and analytically determined COF for SGs , , and were in the range of 6–9 N, 3–12 N, and 3–9 N and 0.08–0.16, 0.22–0.46, and 0.012–0.018, respectively. The computational model predicted COFs in the range of 0.00025–0.0055, 0.025–0.07, and 0.00025–0.006 for SGs , , and , respectively. Our results suggest that for SGs and , which are exoskeleton based devices, the pullout forces increase upto a particular oversize beyond which they plateau, while pullout forces showed a continuous increase with oversize for SG , which is an endoskeleton based device. The COF decreased with oversizing for both types of SGs. The proposed methodology will be useful for determining the COF between self-expanding stent-grafts from pullout tests on human arterial tissue.
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e-mail: jpv1@email.arizona.edu
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December 2010
Research Papers
Determination of Coefficient of Friction for Self-Expanding Stent-Grafts
Siddharth Vad,
Siddharth Vad
Department of Aerospace and Mechanical Engineering,
University of Arizona
, Tucson, AZ 85721
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Amanda Eskinazi,
Amanda Eskinazi
Department of Agricultural and Biosystems Engineering,
University of Arizona
, Tucson, AZ 85721
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Timothy Corbett,
Timothy Corbett
Center for Applied Biomedical Engineering Research (CABER), MSSi, and Department of Aerospace and Mechanical Engineering,
University of Limerick
, Ireland
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Tim McGloughlin,
Tim McGloughlin
Center for Applied Biomedical Engineering Research (CABER), MSSi, and Department of Aerospace and Mechanical Engineering,
University of Limerick
, Ireland
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Jonathan P. Vande Geest
Jonathan P. Vande Geest
Department of Aerospace and Mechanical Engineering, Department of Biomedical Engineering, and BIO5 Institute for Collaborative Research,
e-mail: jpv1@email.arizona.edu
University of Arizona
, Tucson, AZ 85721
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Siddharth Vad
Department of Aerospace and Mechanical Engineering,
University of Arizona
, Tucson, AZ 85721
Amanda Eskinazi
Department of Agricultural and Biosystems Engineering,
University of Arizona
, Tucson, AZ 85721
Timothy Corbett
Center for Applied Biomedical Engineering Research (CABER), MSSi, and Department of Aerospace and Mechanical Engineering,
University of Limerick
, Ireland
Tim McGloughlin
Center for Applied Biomedical Engineering Research (CABER), MSSi, and Department of Aerospace and Mechanical Engineering,
University of Limerick
, Ireland
Jonathan P. Vande Geest
Department of Aerospace and Mechanical Engineering, Department of Biomedical Engineering, and BIO5 Institute for Collaborative Research,
University of Arizona
, Tucson, AZ 85721e-mail: jpv1@email.arizona.edu
J Biomech Eng. Dec 2010, 132(12): 121007 (10 pages)
Published Online: November 8, 2010
Article history
Received:
March 25, 2010
Revised:
September 12, 2010
Posted:
October 15, 2010
Published:
November 8, 2010
Online:
November 8, 2010
Citation
Vad, S., Eskinazi, A., Corbett, T., McGloughlin, T., and Vande Geest, J. P. (November 8, 2010). "Determination of Coefficient of Friction for Self-Expanding Stent-Grafts." ASME. J Biomech Eng. December 2010; 132(12): 121007. https://doi.org/10.1115/1.4002798
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