| Project/Area Number |
01850042
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
AKAMATSU Teruaki Kyoto Univ., Professor, 工学部, 教授 (40025896)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Nobuyuki Fuji Film Inc., Manager, 部長
SHIROYAMA Tomohiro Kyoto Univ., Technical officer, 工学部, 教務職員
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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 |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1989: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Centrifugal blood pump. / Hemolysis test / Micro-capsule / Pump performance |
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| Research Abstract |
Hemolysis and coagulation of blood as well as dynamical pump performance are serious problems in blood pumps. It is specially important to develop a centrifugal blood pump with low hemolysis even under high speed rotation of impeller. Highly repeatable hemolysis test by real blood is not easy owing to biological surface reaction on materials. Therefore, if we, as substitute of red blood cell, use micro-dye-capsules, which are sensitive to dynamical forces but biologically inert, then we can expect highly repeatable hemolysis data only caused by pure dynamical effects. These capsules are particles for pressure sensing sheets of industrial use.
The test results are as follows : "1". We established simulation test methods of hemolysis with micro-dye -capsule solutions (produced by Fuji Film Inc.). The leuco dye in the damaged capsule becomes free as droplets in the solutions. Measured dye concentration on a color sensing sheet indicates the
damaged grade of the capsules. This is very similar to free hemoglobin in real hemolysis test. "2". Hemolysis tests of in double cones and nutating centrifugal blood pumps result that the damage of capsules is expressible with an exponential function of shear stress multiplied by elapse time. The damage of capsules increase severely at the higher rotational speed than 3500 rpm. The threshold of hemolysis for our nutating centrifugal pump proved to be 3500 rpm. This correlate well with hemolysis test by real blood.
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