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2 Biocybernetics and Biomedical Engineering

2 2006

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Current status of the intra-cardiac axial flow pump

100%

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.

Development of implantable assist pump and its peripheral devices

100%

Okamoto E. , Makino T. , Yamamoto Y. , Asao H. , Watanabe N. , Nakamura M. , Tanaka S. , Inoue Y. , Yasuda T. , Mitamura Y.

tom Vol. 26, no. 1

45-51

Two national project for development of an artificial heart system are being undertaken in Japan, and Hokkaido Tokai University has taken part in both national projects in order to develop peripheral devices of an implantable VAD (ventricular assist device) system. Each of the peripheral devices incIudes a transcutaneous energy transmission system, an internal battery system, and a transcutaneous information transmission system. Maximum energy transmission efficiency of the transcutaneous energy transmission system is over 85% (DC to DC) at an energy transmission ratio of 25 W. The internal battery system mainly consists of three lithium ion batteries, a charge circuit, and a power interface (case size of 11Ox80x30 mm). The internal battery system can drive a VAD for over 2 hours with maximum battery case surface temperature of 43°C. The information transmission system (diameter of 52 mm and thickness of 12 mm) mainly consists of an ASK modulator and an ASK demodulator employing carrier frequencies of 4 MHz and 10 MHz. It can transmit data electromagnetically between inside and outside of the body bi-directionally at a data transmission ratio of 56 kbps. Long-term animal experiments showed that each peripheral device has adequate performance to support the operation of implantable VAD.