Document Detail

A nonlinear anisotropic model for porcine aortic heart valves.
MedLine Citation:
PMID:  11522307     Owner:  NLM     Status:  MEDLINE    
The anisotropic property of porcine aortic valve leaflet has potentially significant effects on its mechanical behaviour and the failure mechanisms. However, due to its complex nature, testing and modelling the anisotropic porcine aortic valves remains a continuing challenge to date. This study has developed a nonlinear anisotropic finite element model for porcine heart valves. The model is based on the uniaxial experimental data of porcine aortic heart valve leaflet and the properties of nonlinear composite material. A finite element code is developed to solve this problem using the 8-node super-parameter nonlinear shells and the update Lagrangian method. The stress distribution and deformation of the porcine aortic valves with either uniform and non-uniform thicknesses in closed phase and loaded condition are calculated. The results showed significant changes in the stress distributions due to the anisotropic property of the leaflets. Compared with the isotropic valve at the same loading condition, it is found that the site of the peak stress of the anisotropic leaflet is different; the maximum longitudinal normal stress is increased, but the maximum transversal normal stress and in-plane shear stress are reduced. We conclude that it is very important to consider the anisotropic property of the porcine heart valves in order to understand the failure mechanism of such valves in vivo.
J Li; X Y Luo; Z B Kuang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biomechanics     Volume:  34     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-08-27     Completed Date:  2002-02-07     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1279-89     Citation Subset:  IM    
School of Civil Engineering and Mechanics, Xi'an Jiaotong University, 710049 Xi'an, People's Republic of China.
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MeSH Terms
Aortic Valve*
Bioprosthesis / standards
Finite Element Analysis
Heart Valve Prosthesis / standards*
Models, Cardiovascular*
Stress, Mechanical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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