| Application of finite element analysis to the design of tissue leaflets for a percutaneous aortic valve. | |
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MedLine Citation:
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PMID: 21094482 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Percutaneous Aortic Valve (PAV) replacement is an attractive alternative to open heart surgery, especially for patients considered to be poor surgical candidates. Despite this, PAV replacement still has its limitations and associated risks. Bioprosthetic heart valves still have poor long-term durability due to calcification and mechanical failure. In addition, the implantation procedure often presents novel challenges, including damage to the expandable stents and bioprosthetic leaflets. In this study, a simplified version of Fung's elastic constitutive model for skin, developed by Sun and Sacks, was implemented using finite element analysis (FEA) and applied to the modelling of bovine and kangaroo pericardium. The FEA implementation was validated by simulating biaxial tests and by comparing the results with experimental data. Concepts for different PAV geometries were developed by incorporating valve design and performance parameters, along with stent constraints. The influence of effects such as different leaflet material, material orientation and abnormal valve dilation on the valve function was investigated. The stress distribution across the valve leaflet was also examined to determine the appropriate fibre direction for the leaflet. The simulated attachment forces were compared with suture tearing tests performed on the pericardium to evaluate suture density. It is concluded that kangaroo pericardium is suitable for PAV applications, and superior to bovine pericardium, due to its lower thickness and greater extensibility. |
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Authors:
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A N Smuts; D C Blaine; C Scheffer; H Weich; A F Doubell; K H Dellimore |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-09-29 |
Journal Detail:
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Title: Journal of the mechanical behavior of biomedical materials Volume: 4 ISSN: 1878-0180 ISO Abbreviation: J Mech Behav Biomed Mater Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-11-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101322406 Medline TA: J Mech Behav Biomed Mater Country: Netherlands |
Other Details:
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Languages: eng Pagination: 85-98 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Mechanical and Mechatronic Engineering, Stellenbosch University, Matieland, South Africa. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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