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一、引言给人工心脏瓣膜配以喇叭形伸展的骨架(图1,2),可以提高其使用寿命。骨架由柔性的Eligilog合金线作成,其目的是使孔口和接缝处产生的应力冲击波为最小,从而增加寿命。从血流动力学观点要求骨架成型至准确的设计尺寸,但由于骨架从模具取出有一定的变形,即存在回弹问题。本文根据骨架在模中成型时,横剖面部分应力已经超过屈服极限的实际情况推导出考虑回弹的实用计算方法。若考虑到Eligilog丝原为锥形体,在计算中可按不同横剖面尺寸来进行曲率的回弹计算。
First, the introduction to the artificial heart valve flared skeleton (Figure 1, 2), can improve its service life. Skeletons are made of a flexible Eligilog alloy wire with the goal of minimizing stress shock waves created at the orifice and seams, thereby increasing lifetime. From the hemodynamic point of view requires skeleton molding to accurate design size, but because the skeleton removed from the mold a certain deformation, that there is a rebound problem. In this paper, based on the skeleton in the mold forming, the cross-section of the partial stress has exceeded the yield limit of the actual situation to deduce the practical calculation method to consider the springback. Taking into account the original Eligilog wire cone, in the calculation of different cross-sectional dimensions for the springback calculation of curvature.