A hydrodynamically suspended, magnetically sealed mechanically noncontact axial flow blood pump: Design of a hydrodynamic bearing

Yoshinori Mitamura, Kazuyuki Kido, Tetsuya Yano, Daisuke Sakota, Tomoyuki Yambe, Kazumitsu Sekine, Eiji OKamoto

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To overcome the drive shaft seal and bearing problem in rotary blood pumps, a hydrodynamic bearing, a magnetic fluid seal, and a brushless direct current (DC) motor were employed in an axial flow pump. This enabled contact-free rotation of the impeller without material wear. The axial flow pump consisted of a brushless DC motor, an impeller, and a guide vane. The motor rotor was directly connected to the impeller by a motor shaft. A hydrodynamic bearing was installed on the motor shaft. The motor and the hydrodynamic bearing were housed in a cylindrical casing and were waterproofed by a magnetic fluid seal, a mechanically noncontact seal. Impeller shaft displacement was measured using a laser sensor. Axial and radial displacements of the shaft were only a few micrometers for motor speed up to 8500 rpm. The shaft did not make contact with the bearing housing. A flow of 5 L/min was obtained at 8000 rpm at a pressure difference of 100 mm Hg. In conclusion, the axial flow blood pump consisting of a hydrodynamic bearing, a magnetic fluid seal, and a brushless DC motor provided contact-free rotation of the impeller without material wear.

Original languageEnglish
Pages (from-to)221-224
Number of pages4
JournalArtificial Organs
Volume31
Issue number3
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • Axial flow pump
  • Hydrodynamic bearing
  • Magnetic fluid seal
  • Rotary blood pump

ASJC Scopus subject areas

  • Bioengineering
  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering

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