Wakisaka Y, Okuzono Y, Taenaka Y, Chikanari K, Masuzawa T, Nakatani T, Tatsumi E, Nishimura T, Takewa Y, Ohno T, Takano H
Department of Artificial Organs, National Cardiovascular Center, Research Institute, Osaka, Japan.
Artif Organs. 1997 Jul;21(7):651-4. doi: 10.1111/j.1525-1594.1997.tb03716.x.
A flow rate estimating method was investigated for a centrifugal blood pump developed in our institute. The estimated flow rate was determined by the power consumption, the rotating speed of the motor, and the hematocrit value. The power consumption and the rotating speed of the motor were measured with a wattmeter. The examinations were performed in a closed mock loop filled with goat blood with hematocrit values of 21.5%, 28%, 34%, and 42%. Measured values of blood viscosity were 2.47, 3.09, 3.71, and 5.07 mPa.s at a share rate of 37.5/s, respectively. A linear correlation between the power consumption and the pump flow rate was observed in all hematocrit values. But variations in hematocrit caused a difference in the flow rate up to 1.1 L/min at the same power consumption and rotating speed. Effects of blood viscosity on the flow estimation were corrected by the hematocrit value. The value of the coefficient of determination, R2, between the estimated flow rate and the measured flow rate was 0.988. These results may indicate that the flow estimating method calculated by the power consumption of the motor, the rotating speed, and the hematocrit value is useful in the clinical situation.
针对我们研究所研发的离心式血泵，研究了一种流量估算方法。估算流量由功耗、电机转速和血细胞比容值确定。用功率计测量功耗和电机转速。在充满血细胞比容值分别为21.5%、28%、34%和42%的山羊血液的封闭模拟回路中进行测试。在剪切速率为37.5/s时，血液粘度的测量值分别为2.47、3.09、3.71和5.07 mPa·s。在所有血细胞比容值下，均观察到功耗与泵流量之间存在线性相关性。但在相同功耗和转速下，血细胞比容的变化会导致流量差异高达1.1 L/min。通过血细胞比容值校正了血液粘度对流量估算的影响。估算流量与测量流量之间的决定系数R²值为0.988。这些结果可能表明，通过电机功耗、转速和血细胞比容值计算的流量估算方法在临床情况下是有用的。
