两种人工机械心瓣启闭过程的ALE有限元分析

A Comparative Study of the Opening and Closing Process of Two Types of Mechanical Heart Valves Using ALE Finite Element Method

本文采用任意拉格朗日－欧拉（ＡＬＥ）有限单元法，将血液视为不可压缩粘性流体，同时将人工机械瓣简化为定轴转动刚体，建立了机械心瓣／血液耦合运动的二维计算模型．在此基础上．计算了顺向人工机械瓣（ＤＤＭ）的开闭过程，并与Ｓｔ．Ｊｕｄｅ瓣（ＳＪＭ）进行了对比．由本文研究可得以下主要结论：１．ＤＤＭ瓣与ＳＪＭ相比，开启较为迅速，关闭则较为柔和．２．ＤＤＭ瓣的峰值回流量较之ＳＪＭ瓣小．本文研究表明ＤＤＭ瓣由于更好利用了天然心瓣的关闭机理，而具有较高的耐久性潜力．

Using arbitrary Lagrangian-Eulerian(ALE) finite element enethod,this paper made a comparative study of the opening and closing behaviour of a downstreamdirectional valve(DDM) and a St. Jude medical valve(SJM) through a two dimensional model of mechanical valve-blood interaction in which the valve isconsidered as a rigid body rotating around a fixed point,and the blood is simplified as viscous incompressible fluid. Iiis concluded that: 1.Compared with SJMvalve, DDM valve opens faster and closes more gently. 2. The peak back-flow ofDDM is smaller than that of SJM.The present investigation shows that be'ing abetter analogue of natural valve, DDM has a brighter potential on its durabilitythan SJM.