| Project/Area Number |
01570773
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thoracic surgery
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| Research Institution | Hokkaido Tokai University |
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Principal Investigator |
MITAMURA Yoshinore Hokkaido Tokai University, Professor, 工学部, 教授 (70002110)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Keisuke Hokkaido University, Lecturer, 医学部, 講師 (00153841)
WADA Tatsuhiko Hokkaido University, Associate Professor, 医療技術短期大学部, 助教授 (90002112)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Artificial Heart / Electromagnetic pump / Magnetic fluid |
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| Research Abstract |
A variety of actuators have been studied to develop an implantable artificial heart. They, however, have common drawbacks such as complicated energy conversion mechanism and use of bearings. A ferrofluidic actuator directly drives magnetic fluids simply by applying magnetic field and requires no bearings. Feasibility of a ferrofluidic actuator for an artificial heart was studied.
The magnetic fluid used (Ferricolloid<@D1(] SY.encircledr.[)@>D1) consists of tiny magnetite particles suspended in kerosine. To apply magnetic field to the magnetic fluid a ring solenoid with a gap was made. A ferromagnetic material (Permendur<@D1(]SY.encircledr.[)@>D1) was used as a core material and 1500 turns of enamel wire were wound. The gap was 10 mm.
(a) The magnetic fluid in a U-shaped glass cylinder was placed in the air gap of the solenoid. When current was applied to the solenoid, the level of the magnetic fluid was raised by magnetic pressure. Air pressure was applied against the fluid until the level was decreased to the original level to measure the magnetic pressure. Magnetic pressure of 57 mmHg was obtained with the direct of current 5 A. (b) Three solenoids were arranged side by side along the glass cylinder. The solenoids were sequentially energized and deactivated according to signals from an oscillator. Frequency was changed from 0.4 Hz to 10 Hz. The air pressure was monitored. The air pressure of 55/0 mmHg was obtained at 0.4 Hz and 60/0 mmHg at 2 Hz. Maximum pressure of 75/-20 mmHg was observed at 6 Hz and the pressure was decreased for higher frequencies. (c) The relationship between magnetic pressure and magnetic field was theoretically and experimentally examined. The results indicate magnetic flux of 0.49 T is enough for obtaining the air pressure of 100 mmHg.
A ferrofluidic actuator is a promising actuator for an implantable artificial heart.
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