Development of an Oscillating Hung-Vessel Blood Pump

本研究的目的是构建一种新型血泵，即振荡式悬血管血泵，并研究其基本特性。该报告提供了以下新特性：1。首先研究了一种具有水平运动模式的振荡血管血泵，以获得悬挂血管型血泵的基本知识。结果表明，当柔性膜与容器底部轻微接触时，卧式泵的输出量最大。然而，这种结构增加了溶血。应集中精力研究如何在血管中配置膜。一种改进型膜容器泵，偏心5mm， 3000rpm负载80mmHg时输出6L/min。该血泵在体外用牛血进行了测试。溶血改善；溶血指数约0.09。然而，实际应用价值仍然很大。应解决使容器内表面光滑和减少机械振动的问题。利用上述知识，我们构造了一个由两个万向节支撑的振荡悬血管血泵。顶部接头防止容器旋转。另一个关节连接到偏心轴上。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，血泵采用变频感应电机驱动。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，降低市电侧谐波。在本研究中，我们讨论了所提出的血泵及其驱动系统的基本原理。为了提高所提出的血泵的性能，有必要对血管和膜的各种结构进行研究，并进行进一步的实验。这些都是将来要解决的问题。

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.