Comparison of Element Technologies for Modeling Stent Expansion

[+] Author and Article Information
Garrett J. Hall, Eric P. Kasper

Department of Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, CA 93407

J Biomech Eng 128(5), 751-756 (Mar 15, 2006) (6 pages) doi:10.1115/1.2264382 History: Received August 01, 2005; Revised March 15, 2006

Numerical analysis has become a standard, and in fact required, component of the process in which new biomedical stent devices are designed and approved. Despite this, very little work has been performed comparing the efficiency of various numerical techniques currently available to the analyst. The present paper begins this study by comparing the computational efficiency and results achieved using various element technologies in the context of stent deployment simulations. The findings indicate that the methodologies most commonly adopted in the present literature/industrial practice are in many cases less than optimal with regard to computational efficiency.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Representative stent geometries showing the crown pattern and connecting links

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Figure 2

Initial geometry of the stent

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Figure 8

Comparison of computational efficiencies for various dimensionality/element formulations as applied to the stent analysis problem. Note for the beam the response converged with the second (medium) mesh, hence a third is not shown.

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Figure 6

Convergence study using various dimensionality/element formulations

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Figure 7

Comparison of various dimensionality/element formulations for the contact driven stent deployment

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Figure 3

Original and expanded configurations of the stent modeled using a beam based formulation

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Figure 4

Original and expanded configurations of the stent modeled using a shell based formulation

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Figure 5

Original and expanded configurations of the stent modeled using a solid based formulation

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Figure 9

Foreshortening response of stent under the various modeling approaches




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