Axial flow pump pressure algorithm
AssigneeHeartWare, Inc.
InventorsCarlos Reyes, Fernando Casas, Justin Wolman
Life of this patent
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Abstract
The presence or absence of a high pressure condition in an implantable blood pump is determined at least in part based on a comparison between a determined amount of differential pressure across the pump and a pressure threshold value. The amount of differential pressure parameter may be determined based at least in part on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. In response to determining the presence of a high pressure condition, an updated speed of rotation of the rotor that is less than the rotor's initial speed may be determined. The rotor's speed may be increased when the flow rate of blood is determined to be at least equal to a flow recovery threshold value.
Claims36
An implantable blood pump system comprising:
- a pump including a housing having an axis, and a rotor disposed within the housing, the rotor being rotatable around the axis;
- and
- a control circuit operatively coupled to the pump, the control circuit being configured to:
- determine a flow rate of blood based at least in part on a parameter related to thrust on the rotor along the axis;
- and
- determine a pressure condition of the pump based at least in part on the flow rate of blood, the pressure condition being a condition under which differential pressure across the pump equals or exceeds a threshold pressure value.
A control circuit for monitoring the operation of an implantable blood pump, the control circuit comprising:
- a flow rate determination circuit operative to determine a flow rate of blood based at least in part on a parameter related to thrust generated by a rotor of the pump;
- and
- a pump pressure condition determination circuit operative to determine a pressure condition of the pump based at least in part on the determined flow rate of blood, the pressure condition being a condition under which differential pressure across the pump equals or exceeds a threshold pressure value.
A method for monitoring operation of an implantable blood pump, the method comprising:
- determining a flow rate of blood through the pump, wherein the flow rate is determined based at least in part on (i) a parameter relating to thrust generated by a rotor of the pump and (ii) speed of rotation of a rotor of the pump;
- and
- determining a pressure condition of the pump based at least in part on the flow rate of blood, the pressure condition being a condition under which differential pressure across the pump equals or exceeds a threshold pressure value.
An implantable blood pump system comprising:
- a pump including a housing having an axis, and a rotor disposed within the housing, the rotor being rotatable around the axis;
- and
- a control circuit operatively coupled to the pump, the control circuit being configured to:
- determine a differential pressure across the blood pump based at least in part on an initial speed of rotation of the rotor;
- compare the differential pressure to a threshold pressure value;
- determine the presence or absence of a high pressure condition based at least in part on the comparison;
- and
- in response to determining the presence of a high pressure condition, determine an updated speed of rotation of the rotor, the updated speed being less than the initial speed.
A control circuit for monitoring the operation of an implantable blood pump, the control circuit comprising:
- a differential pressure determination circuit operative to determine an amount of differential pressure across the blood pump;
- a pressure condition determination circuit operative to determine whether the determined amount of differential pressure is at least equal to a differential threshold pressure value;
- and
- an operating speed determination circuit operative to determine a reduced speed of rotation of the rotor based on the determination of the pressure condition determination circuit.
A method of monitoring operation of an implantable blood pump, comprising:
- determining an amount of differential pressure across the pump at an initial speed of rotation of a rotor of the pump;
- comparing the amount of differential pressure to a differential threshold pressure value
- determining the presence or absence of a high pressure condition at least partially based on the comparison;
- and
- in response to determining the presence of a high pressure condition, determining an updated speed of rotation of the rotor less than the initial speed.
Dependencies are inferred from the claim text.