Application of finite element analysis to the design of tissue leaflets for a percutaneous aortic valve
Date
2011
Authors
Smuts A.N.
Blaine D.C.
Scheffer C.
Weich H.
Doubell A.F.
Dellimore K.H.
Journal Title
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Volume Title
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Abstract
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. © 2010 Elsevier Ltd.
Description
Keywords
Aortic valve leaflets, Aortic valves, Biaxial tissue testing, Bovine pericardium, Finite element analysis, Kangaroo pericardium, Biomineralization, Blood vessels, Constitutive models, Stress concentration, Tissue, Transplantation (surgical), Valves (mechanical), Finite element method, collagen, glutaraldehyde, aorta, article, cow, finite element analysis, force, geometry, heart valve, kangaroo, pericardium, priority journal, simulation, Animals, Aortic Valve, Aortic Valve Stenosis, Biomechanics, Biomedical Engineering, Bioprosthesis, Cattle, Elastic Modulus, Finite Element Analysis, Heart Valve Prosthesis, Heart Valve Prosthesis Implantation, Humans, Macropodidae, Materials Testing, Models, Cardiovascular, Nonlinear Dynamics, Pericardium, Prosthesis Design, Stress, Mechanical, Suture Techniques, Tissue Engineering
Citation
Journal of the Mechanical Behavior of Biomedical Materials
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