Mechanically non-contact axial flow blood pump

• Autorzy: Mitamura Y. , Kido K. , Yano T. , Sakota D. , Yozu R. , Okamoto E. , Murabayashi S. , Nishimura I.
• Języki publikacji: EN

Abstrakty

EN

To overcome the drive shaft seal and bearing problem of the rotary blood pump, a hydro-dynamic bearing, a magnetic fluid seal and a brushless DC motor were employed in an axial flow pump. This enabled contact free rotation of the impeller without material wear. The axial flow pump consists of a brushless DC motor, an impeller and a guide vane. The motor rotor is directly connected to the impeller by a motor shaft. A hydrodynamic bearing is installed on the motor shaft. The motor and the hydrodynamic bearing are housed in a cylindrical casing and are waterproofed by a magnetic fluid seal. Impeller shaft displacement was measured using laser sensor. The axial and radial displacements of the shaft were less than a few micrometers for up to 8500 rpm. The shaft did not touch the housing. A flow of 5 L/min was obtained at 8000 rpm at a pressure difference of 100 mmHg. The left ventricular bypass experiment was performed in vitro. With an increase of the motor speed, the bypass flow increased, and at 7000 rpm a total bypass was obtained. The hydrodynamic bearing worked normally under variable load conditions. In conclusion, the axial flow blood pump consisting of a hydrodynamic bearing, a magnetic fluid seal and a brushless DC motor provides contact free rotation of the impeller without material wear.

Słowa kluczowe

EN

rotary blood pump; hydrodynamic bearing; magnetic fluid seal

PL

przepływ krwi; pompa rotacyjna; łożysko hydrodynamiczne

• Wydawca: Nałęcz Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of Sciences ; Elsevier
• Czasopismo: Biocybernetics and Biomedical Engineering
• Rocznik: 2007
• Tom: Vol. 27, no. 1-2
• Strony: 139--146
• Opis fizyczny: Bibliogr. 10 poz., rys., wykr.

Twórcy

autor

Mitamura Y.

autor

Kido K.

autor

Yano T.

autor

Sakota D.

autor

Yozu R.

autor

Okamoto E.

autor

Murabayashi S.

autor

Nishimura I.

• Department of Biomedical Systems Engineering, Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Kita-ku, Sapporo 060-0814, Japan,

Bibliografia

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• 8. Mitamura Y, Nakamura H., Okamoto E., et al.: Development of the Valvo Pump: An axial flow pump implanted at the heart valve position; Artif. Organs, 1999, 23, 566-571.
• 9. Sekine K., Mitamura Y, Murabayashi S., et al.: Development of a magnetic fluid shaft seal for an axial-flow blood pump; Artif. Organs, 2003, 27, 892-896.
• 10. Mitamura Y, Yano T., Kido K., et al.: Current status of the intra-cardiac axial flow pump; Lecture Notes on ICB Seminars: 7th Polish-Japanese Seminar on New Technologies for Future Artificial Organs, 2005, 23-26.