Computer Aided Parametric Design And Finite Element Analysis On Bioprosthetic Heart Valve

The valve replacement surgery on patients with heart valve disease is an effective means of saving their lives. With the development of theoretical study on bioprosthetic heart valve design, flow field theory, open and close mechanism, turbulent jet, biomaterials, etc, computer-aided theory and technology research around antithrombus, anti-calcification and the durability of bioprosthetic heart valve will show broad prospects.Based on the heart anatomy, membrane theory, we establish the geometrical parametric model of bioprosthetic heart valve by Pro/E to reach the function of the human heart valves. On the basis of clinical dynamic parameters, we get prototype and construct parametric model of bioprosthetic valve by analyzing natural form of human valve. Considering both traditional design theories and modern design method, we take turns to create the cylinder, sphere, paraboloid, ellipsoid surfaces and then make them to intersect with inverse conic surfaces in order to get satisfy boundary curves and important points on the actual condition. After constructing parametric models of bioprosthetic heart valves via computer aided design, a series of accurate dimension parameters are obtained. Then analyze the stress distribution of different parametric models by the ANSYS software.Finite element analysis is defective in modeling function though it is used commonly on stress analysis, which is also crucial to the design of anti-fatigue and anti-calcification of bioprosthetic heart valve. The introduction of computer aided design provide a convenience to the parametric model of bioprosthetic heart valve and improve the accuracy of parametric models. Computer aided design create the conditions for finite element analysis and dynamic simulation of bioprosthetic heart valve, and also can choose the optimization configuration by the results of finite element analysis. In this article, we analyse the parametric model of bioprosthetic heart valve with different configurations, different thickness, different angles and different material properties, and compare the stress distribution according to the results of finite element analysis, finally choose the ellipsoid surface configuration with stress distribution more reasonable which can be applied in the design and manufacture. This work is very helpful to make optimization design for the biopresthetic heart valve and prolong the lifetime of the synthetic heart valve.