一种植入式磁悬浮离心血泵的体外流体力学实验研究

摘要

To study hydrodynamic in vitro of an implantahle magnetic levitation blood pump using vitro test loop. The fresh sheep blood was prepared for the circulating medium. The output of the pump was tested at the different speeds against 100 mmHg; by controlling the pump's speed, the output of the pump was tested against different afterload.The blood pump worked at 24 V and the electric current was 0.3-0.75 A. Power consumption of the pump was 7.2-18 W. At 2 900-3 900 rpm, the pump generated 3~7.1L/min flow against 10.0 mmHg. At 2500~3500 rpm, the pump generated 1.02~5.87 L/min flow against 69~63 mmHg. The relationship between pressure and flow was negative correlation at fixed pump's speed. The blood pump works stably in vitro test. The pump can meet the need of adult's ventricular assist, but power consumption of the pump needs further improvement.%通过体外模拟循环实验台对一种植入式磁悬浮离心血泵进行体外流体力学实验.以新鲜羊血为循环介质,通过体外循环台测定在后负荷为100 mmHg,血泵在不同转速下的输出量；通过控制血泵的转速,测定在固定泵速下不同后负荷下的输出量.血泵测试工作电压为24V,电流波动于0.3～0.75 A.血泵功率为7.2～18W.在后负荷为100 mmHg下,泵速在2 900～3 900 rpm,输出流量为3～7.1 L/min.泵速为2 500～3 500rpm,血泵在后负荷69～ 163 mmHg下输出流量为1.02 ～ 5.87 L/min.在固定的转速下血泵的压力-流量呈负相关关系.体外实验血泵工作性能稳定,可以满足成人心室辅助的需求.血泵功率偏高仍需要进一步改进.