Development of an Oscillating Hung-Vessel Blood Pump

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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.