Abstract
Recent studies suggest that calcification of tissue heart valves is associated with leaflet flexural stresses. Stress distribution maps obtained from numerical analysis studies of leaflet motion can be used to optimise valve design by reducing concentrated stresses and thus attenuate calcification. To date, little structural analysis has been carried out on the leaflet closure phase and none for the opening phase. In this paper, two 3D models were built for separately simulating the closure and opening movements of the leaflet under intra-aortic pressure. Results provide comprehensive information on the leaflet deformation and stress-strain distribution derived using a total Lagrangian formulation approach. The findings indicate that higher stresses occur during the opening phase compared to the closure phase. Agreement between the calculated concentrated stress patches and calcification patches from in vivo trial is observed. Longevity of Jellyfish heart valves may therefore be improved by design changes that will reduce stresses in the highly concentrated regions. The use of this type of analysis can assist considerably in the optimisation and assessment of design changes particularly in the early stages of valve development.
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