Passive non-contacting smart bearing suspension for turbo...

Details Passive non-contacting smart bearing suspension for turbo... Passive non-contacting smart bearing suspension for turbo...

A - Human Necessities

61

M

A61M 1/12 (2006.01) A61M 1/10 (2006.01)

Patent

CA 2468546

The ultimate in suplicity and reliability, an axial-flow blood pump is supported by an all passive contact-free hybrid bearing suspension that can measure differential pump pressure. The preferred suspension consists of a radial hydrodynamic journal bearing with axial magnetic thrust bearings. The thrust bearing consists of repulsion magnet pairs positioned at each end of the rotor. This holds bidirectional loads with a stable restoring force (negative axial stiffness). Rotor axial position shifts with load and is monitored with a position sensor to inherently provide pump differential pressure (which may be used to physiologically control pump flow rate). The hydrodynamic radial and "smart" axial magnet thrust bearings use large gaps to eliminate hemolysis and are actively washed out under pressure with fresh blood to eliminate thrombosis.

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