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US 11,446,481 B2Granted
Axial pump pressure algorithm with field oriented control
AssigneeHeartWare, Inc.
InventorsJustin Wolman, Fernando Casas, Carlos Reyes, Thomas R. Johnson
Life of this patent
Estimating the term…
Abstract
A method of controlling an implantable blood pump including a housing having a proximal portion including an inlet, a distal portion including an outlet, and an impeller therein, the method including detecting when a pressure in the housing exceeds a pressure threshold and executing a first vector control command to displace the impeller axially in a distal direction from a primary position to a secondary position different than the primary position in response to the pressure exceeding the pressure threshold.
Claims21
A blood pump system comprising:
- an implantable blood pump including:
- a housing having an inlet and an outlet, the housing defining a housing axis extending from the inlet to the outlet and including a mechanical stop co-axial with the housing axis;
- an impeller suspended a distance away from the mechanical stop within the housing, the impeller being configured to rotate around the housing axis;
- and
- a motor configured to cause the impeller to rotate;
- and
- a controller including a control circuit, the control circuit being in communication with the blood pump and being configured to:
- determine that a pressure across the pump crosses a pressure threshold indicative of suction, and, in response to the pressure crossing the pressure threshold indicative of suction, displace the impeller from a first position to a second position different than the first position and reduce a speed of the impeller;
- maintain the impeller in the second position when the pressure crosses the pressure threshold indicative of suction;
- and
- displace the impeller from the second position to the first position when the pressure crosses the pressure threshold indicative of a lack of suction.
8 more elements
A method comprising:
- detecting that a pressure in a housing of a blood pump exceeds a pressure threshold indicative of suction, wherein the blood pump comprises:
- the housing having an inlet and an outlet, the housing defining a housing axis extending from the inlet to the outlet and including a mechanical stop co-axial with the housing axis;
- an impeller suspended a distance away from the mechanical stop within the housing, the impeller being configured to rotate around the housing axis;
- and
- a motor configured to cause the impeller to rotate;
- in response to the pressure exceeding the pressure threshold, displacing the impeller from a primary position to a secondary position different than the primary position and reducing a speed of the impeller, wherein displacing the impeller includes moving the impeller away from the mechanical stop;
- maintaining the impeller in the secondary position;
- detecting a non-suction pressure condition of the blood pump;
- and
- displacing the impeller from the secondary position to the primary position when the non-suction pressure condition is detected.
7 more elements
A blood pump system comprising:
- an implantable blood pump including:
- a housing having an inlet and an outlet, the housing defining a housing axis extending from the inlet to the outlet and including a mechanical stop;
- an impeller suspended a distance away from the mechanical stop within the housing, the impeller being configured to rotate around the housing axis;
- and
- a motor configured to cause the impeller to rotate;
- and
- a controller including a control circuit configured to:
- detect a suction condition of the blood pump by at least determining the impeller is at a first position within a first predetermined distance from the mechanical stop;
- and
- in response to determining the impeller is in the first predetermined position, control the motor to reduce a speed of the impeller and displace the impeller in a distal direction from the first predetermined position to a second position further away from the mechanical stop than the first predetermined position along the housing axis.
7 more elements
Dependencies are inferred from the claim text.