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1 Biocybernetics and Biomedical Engineering

1 2006

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Current status of the intra-cardiac axial flow pump

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Mitamura Y. , Yano T. , Kido K. , Sakota D. , Takahashi N. , Mori Y. , Murabayashi S. , Nishimura I. , Sekine K.

tom Vol. 26, no. 1

39-44

Pulsatile artificial hearts having a relatively large volume are difficult to implant in a small patient, but rotary blood pumps can be easily implanted. The objective of this study was to show the feasibility of using the Valvo-pump, an axial flow pump implanted at the heart valve position, in such cases. The Valvo-pump consists of an impeller and a motor. The motor is waterproofed with a magnetic fluid seal. A blood flow of 5 L/min was obtained at a pressure difference of 13.3 kPa at 7,500 rpm. The normalized index of hemolysis (NIH) was 2.6 times the Bio-Pump. The pump was implanted in three goats between the left ventricle and the aorta. The pump bypassed about 85% of cardiac output. The results showed that the Valvo-pump could maintain systemic circulation with an acceptable level of hemolysis.