中文摘要：

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．

英文摘要：

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.