新型推板式左心辅助血泵的流场试验

The Test of Mean Flow Velocity Patterns within a New Push Plate Ventricular Assist Device

报告了Ｚ４型推板式左心辅助血泵的结构以及进行流场试验的方法。试验结果表明，在充盈期，流体在心室内形成一个大旋涡，这个旋涡形成是以切线方向流入的模拟液与圆形血室内壁相互作用的结果，最大线速度（１２５ｃｍ／ｓ）产生在进口管内瓣膜的大口一侧。在排血期，旋涡中心往出口管方向偏移，最大线速度（１２０ｃｍ／ｓ）出现在出口管内。血室内流动状况良好，无滞流，无紊流，血液对血室内壁有良好的洗刷效应，血室内壁不易形成血栓，该血泵形状设计是比较合理的。

This article reports the design of Z 4 Push Plate Ventricular Assist Device and the test of its mean flow velocity patterns.The results showed that during diastole the interaction of the jet formed by incoming fluid within the boundaries of the blood chamber induced a large clockwise vortex,its centre was the centre of the chamber circle;the largest velocity (approximately 125 cm/sec) was generated near the major orifice of the valve in inlet conduit.During systole the centre of the vortex came close to the outlet conduit;the largest velocity (approximately 120cm/sec) was generated in inlet conduit.There were no turbulent flow and stagnation point during the pume cycle.The mean velocity patterns proved a good wall washing over the entire chamber and the internal surfaces of the pump should be resistant to thrombus deposition.