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1 Biocybernetics and Biomedical Engineering

1 2007

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Characteristics of spiral vortex pump driven by two different drivers

Ito K., Sudo T., Shima T., Kouno Y., Ohnishi Y., Tanaka T., Iwasaki K., Fujimoto T., Umezu M.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

121-132

Here we describe a cardio-ventricular support system that combines a spiral vortex blood pump with an intra-aortic balloon pump driver. To reduce cost, we replaced the conventional ventricular assist driver with one used for an aortic balloon pump. We characterized the hydrodynamics of both drivers by recording pressure and flow waveforms during a single pulse for typical conditions of the pump. The pressure pulse of the ventricular assist driver was rectangular in shape, and the flow was maximal in the systolic fraction, when balanced conditions were achieved. By contrast, the triangle shaped pressure pulse of the balloon pump driver produced a constant volume. Flow increased in proportion to the rate of pulsation and drive volume. A minimum requirement set flow to 5 liters after 80 beats per minute. The balloon pump driver met the requirement with a 44 ml volume. Thus, the balloon pump driver effectively substituted for the ventricular assist driver. Our findings suggest that combining a spiral vortex pump with a balloon pump driver is cost-effective for left ventricular support during acute cardiac failure.