Fluid dynamic study on nutating centrifugal blood pump

传统离心血泵的缺点是：封闭式磁力联轴器驱动轴承的热点处血液退化，直接电机驱动时通过轴封感染和污染。为了克服这些问题，有一种带有转动叶轮的离心泵，即所谓的茶勺泵。我们通过下列装置提高了泵的效率和性能：(a)由内壁和外壳壁包围的环形流道，(b)轮廓螺旋入口和扩散器出口，(c)楔形叶轮杆。上述三个部件的外形和尺寸的精心设计，使泵的效率高达53%，所需的叶轮转速从3000转到2500转。所以我们可以预期较低的溶血。对于红血球，我们用传感片颗粒代替微染料胶囊用于工业用途。释放的染料浓度与流场中的剪切应力有关，这些胶囊被证明可用于溶血试验。利用激光多普勒测速仪和压力传感器对泵内血流进行观察，寻求更高的泵性能，研制一种植入式离心血泵。

Conventional centrifugal blood pumps have drawbacks: blood degeneration at hot spots in the bearing of closed magnetic coupling drive, and infection and contamination through the shaft seal in direct motor drive. To overcome these problems, there is a centrifugal pump with nutating impeller, the so-called tea spoon pump. We have improved pump efficiency and characteristics by the following devices: (a) annular flow passage surrounded with an inner wall and outer housing wall, (b) contoured spira6 inlet and diffuser outlet, (c) codgel impeller rod.Careful and refined design of profile and size of the above three components results in the higher pump efficiency up to 53 % and in the lower recessary rotational impeller speed from 3000 rpm to 2500 rpm. So we can expect the lower hemolysis. For red blood cell, we substitute micro dye capsules which are particles of sensing sheet for industrial use. The released dye concentration is related to shear stress in the flow field and these capsules proved to be useful for hemolysis test. Observing f6ows inside the pump by Laser Doppler Velovimeter and pressure transducers, we will search for the higher pump performance and will develop an implantable centrifugal blood pump.