人工机械瓣／血液耦合系统瞬态有限元分析

Transient Analysis of Artificlal Mechanical Valve-Blood Interaction

本文将人工机械心瓣／血液耦合系统作为研究对象，采用有限元法，分析了热解碳、钛合金钢、钴－铬合金钢及陶瓷四种材料机械瓣关闭状态下受突加阶摇压力荷载时的瞬态动力行为。结果表明，人工机械瓣瞬态动力行为近乎刚性，导致瓣叶上产生较高冲击压力，减小机械瓣的弹性模量，可以降低瓣／血液耦合系统的冲击压力。

Using finite element method, this paper has analyzed the blood mechanical heart valve interaction system subjected to a step pressure when the valve is at closing position. As demonstrated in the present study, in such conditions mecha-nical valbes made of pyrolytic carbon,Ti alloy, Co-Cr alloy and ceramics tend to be very stiff which result in high impinging pressure. The impinging pressure acted on the valve of the blood-valve system can be reduced by decreasing the elastic modulus of the mechanical valve.