新型磁耦合式轴流血泵

A New Magnetic Coupling Axial Flow Pump

为了更好地解决旋转式叶片血泵的密封问题 ,本文中采用磁耦合驱动方式 ,设计、加工一小型轴流血泵。血泵由泵体、直流无刷电机、叶轮、一对磁片、隔膜、导流槽和支撑架等部件构成 ,总长度 12 5 m m,容积147m1,材料是 TC4钛合金 ,总重量 380 g。体外和在体试验中分别测试血泵的动力学输出、密封、产热和血液破坏等性能。结果显示 :1体外试验中 ,血泵旋转速度 80 0 0 rpm时输出为 6 .8L / m in、 12 0 mm Hg。 2在 12 0小时的连续运转过程中 ,血泵的表面温度变化较小 ;密封性能也较好。 3 2 4小时的在体试验中 ,血浆中游离血红蛋白含量逐渐增大 ,纤维蛋白原未发生明显变化 ;除血泵的进出接口处和动物肾脏发现微小血栓外 ,脑部和其它腹部脏器未发现血栓。

For rotating blood pump, the sealing problem is a very important one to solve. In this paper, it is introduced that we designed and made a small axial flow pump, applying the magnetic coupling method. The pump consist of a pump body, a brushless DC motor, an impeller, a pair of magnetic discs, a spacer, a blood trough, a support frame, etc. The pump is made of titanium and is 125 mm length, 147 ml volume, total 380 g of weight. Performances of outputting, sealing, heat creating and damage to blood by the pump were investigated. Results showed for external experiment that: (1) The flow rate of the pump was 6.8 L/min against 120 mmHg pressure when the rotation speed was 8000 rpm. (2) The surface temperature of the pump didn't change obviously in 120 hours of rotation, and the sealing function was very well. (3) For vivo experiment, free hemoglobin in blood plasma increased but fibrinogen didn't change obviously, and, at the end there was some micro thrombi at kidney of sheep and at inlet and outlet of the pump after 24 hours. There was no thrombus at the brain and other abdominal organs.