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1994 Fiscal Year Final Research Report Summary

Fluid Dynamic Studies for Performance of Centrifugal Blood Pump with Magnetically Suspended Impeller

Research Project

Project/Area Number 05452152
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

AKAMATSU Teruaki  Kyoto Univ., Faculty of Engineering, Prof., 工学部, 教授 (40025896)

Co-Investigator(Kenkyū-buntansha) SHIROYAMA T  Kyoto Univ., Faculty of Engineering, Assistant, 工学部, 助手 (30263106)
TAKAHIRA H  Kyoto Univ., Faculty of Engineering, Lecturer, 工学部, 講師 (80206870)
Project Period (FY) 1993 – 1994
KeywordsMagnetical Suspension / Centrifugal Blood Pump / Hemolysis / Pump Performance / White Thrombus / Stirling's Law / Animal Experiments / Impeller
Research Abstract

Centrifugal blood pumps are simple, compact, easy to handle, and cheap compared with the displacement ventricular type of artificial hearts. It is promised as an artificial heart of next generation. At present, commercially available centrifugal blood pumps have some drawbacks ; the shear stress and friction heat produced on bearing and seal cause degeneration of blood. Therefore these pumps are clinically used for short term. To overcome these drawbacks, the authors have been developing a centrifugal blood pump with magnetically suspended impeller.
(1) To improve pump efficiency, we have investigated the pump performances of many kinds of impeller's blades and diffusers, and the flow in the gap between the impeller's disc and the pump housing. We could find two kinds of blades with high efficiency. One is the 16-blades with outlet angle beta=90゚ and the other 7-blades with beta=40゚. The hemolysis of these pumps is less than that of Bio-Pump. Further investigation will be necessary to determine which type is better.
(2) Good washout flow is the gap between the impeller disc and the pump casing is observed by visualization. However, animal cxperiments show that white thrombus adheres to the polycarbonate surface of the impeller disc. But this problem is solved by surface polishing and coating with silicon.
(3) The pump operation under the constant motor current shows the pressure-flow characteristics similar to Stirling's law. So the constant current mode is recommended hereafter.
(4) Hemolysis test in the blood circuits with various kinds of orifices proves that the severe hemolysis is observed in case of the orifice with sharp corner faced upstream. This fact is verified by numerical analysis of shear stress.
In conclusion, this pump proves to be very promising as blood pump for long-term use.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 赤松映明: "磁気浮上式遠心血液ポンプの性能と動特性" 日本機械学会論文集(B). 60. 97-102 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Akamatsu: "Performance of Centrifugal Blood Pump with Magnetically Suspended Impeller" Proc. 3rd JSME-KSME Fluid Engineering. 1. 204-207 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Akamatsu: "Recent Studies of the Centrifugal Blood Pump with a Magnetically Suspended Impeller" Artificial Organs 発表予定. 19. 未定 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 赤松映明: "磁気浮上式遠心血液ポンプのポンプ特性ならびに溶血特性" 第41回日本機械学会バイオメカニクスカンファレンス講演論文集. 95-3. 33-34 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 赤松映明: "せん断血流における溶血特性の数値解析的予測" 日本機械学会第72期通常総会講演論文集. 950. 282-283 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 赤松映明: "電磁駆動型人工心臓" 電気学会編 コロナ社, 180 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yoshino: "Performance and Characteristics of Magnetically Suspended Centrifugal Blood Pump. (in Japanese)" Bulettine of JSME. 60-579. 3687-3692 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tsukiya: "Performance of Centrifugal Blood Pump with Magnetically Suspended Impeller" Proc.3rd JSME-KSME Fluid Engineering Conference. 204-207 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Akamatsu: "Recent Studies of the Centrifugal Blood Pump with a Magnetically Suspended Impeller (to be published)" Artificial Organ. Vol.19. (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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