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Nonlinear solid finite element analysis of mitral valves with heterogeneous leaflet layers

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Abstract

An incompressible transversely isotropic hyperelastic material for solid finite element analysis of a porcine mitral valve response is described. The material model implementation is checked in single element tests and compared with a membrane implementation in an out-of-plane loading test to study how the layered structures modify the stress response for a simple geometry. Three different collagen layer arrangements are used in finite element analysis of the mitral valve. When the leaflets are arranged in two layers with the collagen on the ventricular side, the stress in the fibre direction through the thickness in the central part of the anterior leaflet is homogenized and the peak stress is reduced. A simulation using membrane elements is also carried out for comparison with the solid finite element results. Compared to echocardiographic measurements, the finite element models bulge too much in the left atrium. This may be due to evidence of active muscle fibres in some parts of the anterior leaflet, whereas our constitutive modelling is based on passive material.

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  1. Department of Structural Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 1a, Trondheim, Norway

    V. Prot & B. Skallerud

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  1. V. Prot
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  2. B. Skallerud
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Correspondence to V. Prot.

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Prot, V., Skallerud, B. Nonlinear solid finite element analysis of mitral valves with heterogeneous leaflet layers. Comput Mech 43, 353–368 (2009). https://doi.org/10.1007/s00466-008-0310-2

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  • DOI: https://doi.org/10.1007/s00466-008-0310-2

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