Kilpatrick Townsend & Stockton LLP
Centrifugal pump apparatus
A centrifugal blood pump apparatus includes an impeller provided in a blood chamber, a permanent magnet provided in one surface of the impeller, a permanent magnet provided in an inner wall of the blood chamber, a permanent magnet provided in the other surface of the impeller, and a magnetic material and a coil provided in a motor chamber for driving the impeller to rotate via a diaphragm. Grooves for hydrodynamic bearing are formed in the diaphragm facing the impeller, and in the inner wall of the blood chamber, respectively. As a result, the impeller can be smoothly activated to drive by controlling a coil current.
Thoratec Corporation
A F F A A H A A H H F F F F A
A61M F16C F04D A61M A61M H02K A61M A61M H02K H02K F04D F04D F16C F16C A61M
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Hiroyuki Ken Takayoshi Kenichi
Yamada Sugiura Ozaki Suzuki