主动脉瓣膜泵的回流  

Back-flow of aortic valvo-pumps

作　　者：钱坤喜[1] 茹伟民[1] 曾培[1] 王芳群[1] 王颢[1] 袁海宇[1] 

机构地区：[1]江苏大学生物医学工程研究所,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2006年第5期434-436,共3页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(39970736)

摘　　要：为了研究主动脉瓣膜泵的回流，将血泵内的叶轮换成圆柱体，使血泵失去泵血的作用，从而进行回流测试．测试中，血泵分别以15000r／min，17500r／min和20000r／min的转速旋转，出口与进口之间的压力差由一个离心泵提供，用流量计测出从瓣膜泵出口经定、转子间气隙到进口的回流．试验结果表明气隙和压差对回流有明显影响：增大气隙或增大压差都会导致回流的增加．当气隙为0．20mm，进出口压差为13．3kPa时，瓣膜泵的回流为0．6—0．8L/min．回流随时间变化的曲线图表明，在自然心脏舒张期回流产生一个波峰，而在收缩期产生一个波谷．瓣膜泵的转速对回流无明显影响，当转速增大时回流只有略微的下降．To investigate the regurgitation of aortic valvo-pump, the impeller of the pump was replaced by a cylinder and hereby the valvo-pump had lost its pumping function. The pressure head crossing the aortic valvopump rotating at 15 000 r/min, 17 500 r/min and 20 000 r/min respectively was established by a centrifugal pump. The back flow from outlet to inlet of valvo-pump via the air-gap between rotor and stator was measured. Results demonstrated that the air-gap and pressure head have remarkable effect on back-flow ; a larger air-gap or a larger pressure head will lead to a larger back-flow. With 0.20 mm airgap and 13.3 kPa pressure head, the valvo-pump has a 0.6 -0.8 L/min mean back-flow. Instantaneous back-flow measurement indicated that the back-flow value has a wave crest during diastole and a trough during systole of the natural heart. The rotating speed of the valvo-pump has no significnt effects on its back-flow. As the rotating speed increases the back-flow will decrease slightly.

关 键 词：主动脉瓣膜泵 回流测量 气隙和压差 抗血栓形成 

分 类 号：R318.11[医药卫生—生物医学工程]