Journal
JOURNAL OF MEDICAL DEVICES-TRANSACTIONS OF THE ASME
Volume 5, Issue 4, Pages -Publisher
ASME
DOI: 10.1115/1.4005226
Keywords
blood vessels; cardiovascular system; haemodynamics; medical computing; mesh generation; physiological models; Poisson ratio; stents; stress-strain relations
Categories
Funding
- Natural Sciences and Engineering Research Council (NSERC) Canada [371423-09]
- Canada Research Chair program
- Vancouver General Hospital
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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. [DOI: 10.1115/1.4005226]
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