Blood pump with impeller rinse operation
AssigneeHeartWare, Inc.
InventorsMark S. EGLER, Fernando CASAS, Carlos REYES, Jeffrey A. LAROSE
Life of this patent
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Abstract
A method of operating an implantable blood pump having a first stator, a second stator, and an impeller movably disposed there between. The method includes applying a first voltage waveform at first phase to the first stator to generate a magnetic field to rotate the impeller. A second voltage waveform is applied at a second phase shifted from the first phase to the second stator to rotate the impeller, the second voltage waveform is asymmetric to the first voltage waveform.
Claims20
A method of operating an implantable blood pump having a first stator, a second stator, and an impeller movably disposed there between, the method comprising:
- applying a first voltage waveform at first phase to the first stator to generate a magnetic field to rotate the impeller;
- applying a second voltage waveform at a second phase shifted from the first phase to the second stator to rotate the impeller, the second voltage waveform being asymmetric to the first voltage waveform.
A controller for an implantable blood pump having a first stator, a second stator, and an impeller movably disposed there between, the controller comprising:
- a control circuit configured to:
- apply a first voltage waveform at first phase to the first stator to generate a magnetic field to rotate the impeller for a first period of time;
- apply a second voltage waveform at a second phase shifted from the first phase to the second stator to rotate the impeller during the first period of time, the second voltage waveform being asymmetric to the first voltage waveform.
A method of operating an implantable blood pump having a first stator, a second stator, and an impeller movably disposed there between, the method comprising:
- applying a first voltage waveform at first phase to the first stator to generate a magnetic field to rotate the impeller;
- applying a second voltage waveform at a second phase shifted from the first phase to the second stator to rotate the impeller, the second voltage waveform being asymmetric to the first voltage waveform, the first voltage waveform and the second voltage waveform each having transition steps between positive and negative polarities of their respective waveforms, and the first voltage waveform and the second voltage waveform each have the same polarity at their respective transition steps;
- and
- during operation of the implantable blood pump, a predetermined axial gap is maintained between the impeller and the first stator, and wherein the application of the first voltage waveform and the second voltage waveform temporarily increases the predetermined axial gap.
Dependencies are inferred from the claim text.