Development of an Oscillating Hung-Vessel Blood Pump

本研究的目的是构建一种新型的血泵--振荡悬挂式血泵，并对其基本特性进行研究。本文给出了以下新特点：1.首次研究了水平运动模式的摆动脉管血泵，以获得有关悬脉类型的基础知识。观察到，当柔性膜轻微接触容器底部时，水平移动模式泵的输出最大。然而，这种结构增加了溶血作用。应集中精力如何在容器中配置膜。改进型5 mm偏心膜器泵，在3000转/分的80 mm/min负荷下，输出功率为6L/min。血泵是用牛血在体外进行测试的。溶血性能有所改善，溶血指数约为0.09。但在实际应用中仍有较大价值。应解决平滑容器内表面和减少机械振动的问题。利用上述知识，我们构建了一个由两个万向节支撑的摆动悬挂式血泵。顶侧接头可防止血管旋转。另一个关节连接到偏心轴。对泵的基本特性--压头与流量的关系进行了评价。从免维护的角度来看，血泵由逆变器供电的感应电机驱动。讨论了各种技术问题。提出了一种新的控制方案，以提高输入功率因数，减少电网侧的谐波。在本研究中，我们讨论了血泵及其驱动系统的基本原理。为了改善所提出的血泵的性能，有必要研究各种血管和膜的结构，并进行进一步的实验。这些都是未来需要解决的问题。

The purposes of this research are to construct a new blood pump, which is called an oscillating hung-vessel blood pump, and to investigate its fundamental characteristics. This report gives the following new features :1. An oscillating vessel blood pump with horizontal movement mode was first investigated to obtain fundamental knowledge for the hung-vessel type. It was observed that the horizontal-movement-mode type pump had a maximum output when the flexible membrane slightly touched the vessel's bottom. However, this configuration increases hemolysis. Efforts should be concentrated how to configurate a membrane in the vessel. A improved-membrane vessel pump with 5mm-eccentric has 6L/min output for 80mmHg load at 3000rpm. The blood pump was tested in vitro using bovine blood. Hemolysis was improved ; the index of hemolysis is about 0.09. However, the value is still large for practical use. Problems to smoothen inner surface of a vessel and to reduce mechanical vibrations should be solved.2. Using the knowledge mentioned above, we constructed an oscillating hung-vessel blood pump that is supported by two universal joints. The top-side joint prevents vessel's rotation. The other joint is connected to the eccentric axis. Fundamental characteristic of the pump, pressure head versus flow rate, was evaluated.3. The blood pump is driven by an inverter-fed induction motor from the viewpoint of maintenance free. Various technical problems are discussed. A new control scheme is proposed to improve imput power factor and to reduce harmonics on the mains side.In this research, we discussed fundamentals of the proposed blood pump and its driving system. To improve characteristics of the proposed blood pump it is necessary to investigate various configurations of vessel and membrane, and to make further experiments. These are problems to be solved in the future.