Fluid dynamic study on nutating centrifugal blood pump

传统的离心式血泵存在以下缺点：封闭式磁耦合驱动器的轴承中的热点处的血液退化，以及直接电机驱动器中通过轴密封的感染和污染。为了克服这些问题，有一种带有章动叶轮的离心泵，即所谓的茶匙泵。我们通过以下设备提高了泵的效率和特性：（a）由内壁和外壳壁围绕的环形流动通道，（B）成型螺旋入口和扩散器出口，（c）混凝土叶轮杆。对上述三个部件的轮廓和尺寸进行了仔细和精细的设计，使泵的效率提高到53%并且在较低的凹槽中旋转叶轮的速度从3000 rpm到2500 rpm。所以我们可以期待较低的溶血。对于红细胞，我们用微染料胶囊代替工业用的传感片颗粒。释放的染料浓度与流场中的剪切应力有关，并且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观察泵内流场，寻求更高的泵性能，研制植入式离心血泵。

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.