Research Papers

Compliance and Longitudinal Strain of Cardiovascular Stents: Influence of Cell Geometry

[+] Author and Article Information
Tho Wei Tan, Graeham R. Douglas, Timothy Bond

MMC Gamuda, Perak, MalaysiaDepartment of Mechanical Engineering,  University of British Columbia, 2069-6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, CanadaPipestream Incorporated, Houston, TX, 77066

A. Srikantha Phani1

Canada Research Chair in Dynamics of Lattice Materials and Devices, Department of Mechanical Engineering,  University of British Columbia, 2069-6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada e-mail: srikanth@mech.ubc.ca


Corresponding author.

J. Med. Devices 5(4), 041002 (Nov 07, 2011) (6 pages) doi:10.1115/1.4005226 History: Received October 17, 2010; Revised September 24, 2011; Published November 07, 2011; Online November 07, 2011

A systematic study on the influence of the cell geometry of a cardiovascular stent on its radial compliance and longitudinal strain is presented. Eight stent cell geometries—based on common lattice cells—are compared using finite element analysis. It is found that, for a given strut thickness, the radial compliance depends on the shape of the cell and is intimately connected with the longitudinal strain through effective Poisson’s ratio, which depends on the cell geometry. It is demonstrated experimentally that a hybrid stent containing both positive and negative Poisson’s ratio cell lattice geometries exhibited very low values of longitudinal strain. This study indicates that cell geometries may be tailored to minimize longitudinal stresses imposed by the stent onto the artery wall.

Copyright © 2011 by American Society of Mechanical Engineers
Topics: Geometry , stents , Stress
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Figure 1

A schematic of Hybrid geometry combining a regular hexagon (left) with an auxetic, re-entrant hexagon (middle) to give a hybrid geometry (right) of zero effective Poisson’s ratio

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Figure 2

Stent cell geometries considered in this study

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Figure 3

Summary of the mean radial compliance for various cell geometries

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Figure 4

Summary of longitudinal strain for various cell geometries

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Figure 5

Effect of cell geometry on foreshortening: (a) Diamond stent before expansion, (b) Hybrid C stent before expansion, (c) Diamond stent after expansion and (d) Hybrid C stent after expansion. Notice the negligible foreshortening for Hybrid C design.



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