A sealless centrifugal blood pump with passive magnetic and hydrodynamic bearings

Richard Wampler, David Lancisi, Virote Indravudh, Raymond Gauthier, Robert Fine

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We are developing a permanently implantable ventricular assist system based on a sealless centrifugal blood pump. The impeller of the pump is supported by a passive radial magnetic bearing acting in synergy with hydrodynamic bearings. Torque is transmitted to the impeller by electromagnetic coupling via an integrated axial flux gap motor. Computer modeling has been used extensively to guide the hydraulic and electromagnetic design of the pump. As part of the development effort, a prototype system was built, which consisted of a radial magnetic bearing, an axial air gap motor, and a pivot bearing to constrain the axial motion. The following testing has been completed to validate the design. First, hydraulic tests have demonstrated sufficient hydraulic performance. Second, preliminary in vitro evaluation of hemolysis was low compared to that of a BioPump control. Third, a 6 h in vivo experiment was successfully completed.

Original languageEnglish (US)
Pages (from-to)780-784
Number of pages5
JournalArtificial Organs
Issue number8
StatePublished - 1999
Externally publishedYes


  • Axial flux gap motor
  • Hydrodynamic bearings
  • Magnetically suspended centrifugal pump
  • Radial magnetic bearing
  • Ventricular assist device

ASJC Scopus subject areas

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


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