Knierbein B, Mohr-Matuschek U, Rechlin M, Reul H, Rau G, Michaeli W
Helmholtz-Institute for Biomedical Engineering at the RWTH Aachen, West Germany.
Int J Artif Organs. 1990 May;13(5):307-15.
The mechanical loading of the leaflets of a polyurethane blood pump valve at closing pressure (max 300 mmHg) and during the opening phase can be numerically calculated by the finite element method. Geometrical and physical non-linearities, supporting forces by neighbouring leaflets and manufacturing-related thickness distribution are taken into account. The valve housing is assumed to be rigid. Volume forces are neglected. The calculations showed that the critical strain limit of 4.5% (long-term failure limit) was exceeded at closing pressure and during valve opening. During valve operation the connection between leaflet and valve housing and the central leaflet region seem to be the critical areas.
聚氨酯血泵瓣膜瓣叶在关闭压力（最大300毫米汞柱）和开启阶段的机械负荷可通过有限元法进行数值计算。考虑了几何和物理非线性、相邻瓣叶的支撑力以及与制造相关的厚度分布。假定瓣膜外壳是刚性的。忽略了体积力。计算结果表明，在关闭压力和瓣膜开启期间，超过了4.5%的临界应变极限（长期失效极限）。在瓣膜运行期间，瓣叶与瓣膜外壳的连接处以及瓣叶中央区域似乎是关键部位。
