Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2004-02-02
2009-08-18
Freay, Charles G (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S423100, C415S900000, C604S131000
Reexamination Certificate
active
07575423
ABSTRACT:
A rotary blood pump is provided which includes a pump housing and a rotor mounted for rotation with the housing. The rotor has an impeller. A rotor motor is provided including a plurality of permanent magnets carried by the impeller. A first motor stator is positioned on one side of the impeller and a second motor stator is positioned on an opposite side of the impeller. The motor stators each include a plurality of electrically conductive coils and pole pieces located within the housing. A plurality of wedge-shaped hydrodynamic thrust bearings are located outside of the axis of the rotor. During rotation of the impeller, the hydrodynamic bearings are separated from the housing by a fluid film and are not in direct mechanical contact with the housing.
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Cooper & Dunham LLP
Freay Charles G
Heartware, Inc.
White John P.
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