De Hart J, Cacciola G, Schreurs P J, Peters G W
Department of Mechanical Engineering, Eindhoven University of Technology, The Netherlands.
J Biomech. 1998 Jul;31(7):629-38. doi: 10.1016/s0021-9290(98)00063-3.
Failure of synthetic heart valves is usually caused by tearing and calcification of the leaflets. It is postulated that leaflet fibre-reinforcement leads to a decrease of tears and perforations as a result of reduced stresses in the weaker parts of the leaflets. A three-dimensional finite element model of a reinforced three-leaflet valve prosthesis was developed to analyse the stress reduction. Different fibre reinforcements were investigated and the model responses were analysed for stresses that are expected to contribute to failure of fibre-reinforced valve prostheses. Results of these simulations show that, in peak stress areas of reinforced models, up to 60% of the maximum principal stresses is taken over by fibres and that, in some cases of reinforcement, a more homogeneous stress distribution is obtained.
人造心脏瓣膜失效通常是由瓣叶撕裂和钙化引起的。据推测，瓣叶纤维增强可减少瓣叶薄弱部位的应力，从而减少撕裂和穿孔。为分析应力降低情况，建立了一个增强型三叶瓣膜假体的三维有限元模型。研究了不同的纤维增强方式，并对模型响应进行了分析，以考察那些可能导致纤维增强瓣膜假体失效的应力。这些模拟结果表明，在增强模型的峰值应力区域，高达60%的最大主应力由纤维承担，而且在某些增强情况下，应力分布更加均匀。
