Sealing properties of mechanical seals for an axial flow blood pump

Jun Tomioka, Toshio Mori, Kenji Yamazaki, Hitoshi Koyanagi

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    A miniature intraventricular axial flow blood pump for left ventricular support is under development. One of the key technologies required for such pumps is sealing of the motor shaft. In this study, to prevent blood backflow into the motor side, mechanical seals were developed and their sealing properties investigated. In the experimental apparatus, the mechanical seal separated the bovine blood on the chamber side from the cooling water on the motor side. A leakage of the blood was measured by inductively coupled plasma (ICP) light emission analysis. The rate of hemolysis was measured by the cyanmethemoglobin method. Frictional torque acting on the shaft was measured by a torque transducer. In the experiments, the rotational speed of the shaft was changed from 1,000 to 10,000 rpm, and the contact force of the seal faces was changed from 1.96 to 4.31 N. To estimate lubrication regimes, the Stribeck curve, a diagram of the coefficient of friction against the bearing characteristic G number, was drawn. The results of the experiments showed that both the leakage of blood and the rate of hemolysis were very small. The friction loss was also very small. The mechanical seal was operated in various lubrication regimes, from a fluid lubrication regime to a mixed lubrication regime.

    Original languageEnglish
    Pages (from-to)708-711
    Number of pages4
    JournalArtificial Organs
    Volume23
    Issue number8
    DOIs
    Publication statusPublished - 1999

    Fingerprint

    Axial flow
    Lubrication
    Seals
    Blood
    Pumps
    Friction
    Torque
    Hemolysis
    Bearings (structural)
    Light emission
    Inductively coupled plasma
    Cooling water
    Transducers
    Experiments
    Technology
    Light
    Fluids
    Water

    Keywords

    • Axial flow blood pump
    • Mechanical seals
    • Sealing properties

    ASJC Scopus subject areas

    • Biophysics

    Cite this

    Sealing properties of mechanical seals for an axial flow blood pump. / Tomioka, Jun; Mori, Toshio; Yamazaki, Kenji; Koyanagi, Hitoshi.

    In: Artificial Organs, Vol. 23, No. 8, 1999, p. 708-711.

    Research output: Contribution to journalArticle

    Tomioka, Jun ; Mori, Toshio ; Yamazaki, Kenji ; Koyanagi, Hitoshi. / Sealing properties of mechanical seals for an axial flow blood pump. In: Artificial Organs. 1999 ; Vol. 23, No. 8. pp. 708-711.
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