1996 Fiscal Year Final Research Report Summary
Basic Research on Seal-less Centrifugal Blood Pump
| Project/Area Number |
07558251
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Biomedical engineering/Biological material science
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
AKAMATSU Teruaki Kyoto University, Mechanical Engineering, Professor, 工学研究科, 教授 (40025896)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMURA Kazunobu Kyoto University, Medicine, Lecturer, 医学研究科, 講師 (70252450)
SHIROYAMA Tomohiro Kyoto University Mechanical Engineering, Research Associate, 工学研究科, 助手 (30263106)
TAMAGAWA Masaaki Kyoto University, Energy Science, Lecturer, エネルギー科学研究科, 講師 (80227264)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Seal-less Pump / Nutation Type Centrifugal Pump / Centrifugal Pump with Magnetically Suspended Impeller / Indirect Measurement of Flow rate and Pressure / Prediction of Hemolysis / Rotating fluctuation of Magnetically Suspended Impeller |
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| Research Abstract |
We aim at improving the performance of seal-less centrifugal blood pumps (nutation on type and magnetic suspension type) as an artificial heart of next generation.
I.Nutation Type : We replaced the nutating impeller by an undulating circular disc of double action in order to obtain the higher pressure at the lower rotational speed. The pump performance proved to be improved by narrowing the clearance between the edge of disc and the casing, and also by widening the inlet port of diaphragm side.
II.Magnetic suspension Type : (1) Animal experiments verified that the present pump has endurance of more than one year. (2) Without flow meter and pressure transducers, the flow rate and pressure difference can be estimated from the measured motor current and the motor speed. (3) The stability of rotational impeller magnetically suspended was measured by Laser position sensers. This show that the radially straight vane is most stable. (4) By viewing from the same rotational coordinate as rotating impeller, the flow patterns in various kinds of impellers were revealed.
III.Computational Flow Analysis : (1) Distribution of turbulent shear stress in the orifice were computed using the low Reynolds number turbulent model and then the threshold of shear stress for hemolysis were determined. (2) Flows around a nutating circular cylinder were analyzed by the discrete vortex method with diffusion velocit.
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