Pressure/flow characteristic modification of a centrifugal pump in a ventricular assist device
AssigneeTc1 LLC
InventorsAlexander Medvedev, Muhammad Sami
Life of this patent
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Abstract
A ventricular assist device is disclosed. The ventricular assist device may include a centrifugal pump and a controller. The controller may be configured to cause the centrifugal pump to operate at a first speed above a predetermined flow rate. The controller may also be configured to cause the centrifugal pump to operate at a second speed below the predetermined flow rate, wherein the predetermined flowrate is indicative of a crossover point between systole and diastole phases of a person's cardiac cycle.
Claims15
A ventricular assist device comprising:
- a centrifugal pump having a motor;
- and
- a controller, wherein the controller is configured to at least:
- measure a current of the motor;
- determine an estimated flow rate through the centrifugal pump based on the current;
- cause the motor of the centrifugal pump to operate at a first speed when the estimated flow rate is greater than a predetermined flow rate;
- and
- cause the motor of the centrifugal pump to operate at a second speed when the estimated flow rate is less than the predetermined flow rate, wherein the predetermined flowrate is indicative of an actual flow rate through the pump at a crossover point between systole and diastole phases of a person's cardiac cycle.
A method of controlling a centrifugal pump in a ventricular assist device of a person, wherein the method comprises:
- measuring a current of a motor of a centrifugal pump in a ventricular assist device:
- determining an estimated flow rate through the centrifugal pump based on the current:
- causing the motor of the centrifugal pump to operate at a first speed when the estimated flow rate is greater than a predetermined flow rate;
- and
- causing the motor of the centrifugal pump to operate at a second speed when the estimated flow rate is less than the predetermined flow rate, wherein the predetermined flowrate is indicative of an actual flow rate through the pump at a crossover point between systole and diastole phases of a person's cardiac cycle.
A controller for operating a centrifugal pump in a ventricular assist device of a person, wherein the controller comprises:
- one or more processors configured to execute instructions stored on a non-transitory medium, the instructions executable by the one or more processors to at least:
- measure a current of a motor of a centrifugal pump in a ventricular assist device;
- determine an estimated flow rate through the centrifugal pump based on the current;
- cause the motor of the centrifugal pump to operate at a first speed when the estimated flow rate is greater than a predetermined flow rate;
- and
- cause the motor of the centrifugal pump to operate at a second speed when the estimated flow rate is less than the predetermined flow rate, wherein the predetermined flowrate is indicative of an actual flow rate through the pump at a crossover point between systole and diastole phases of a person's cardiac cycle.
A non-transitory machine readable medium having instructions stored thereon for operating a centrifugal pump in a ventricular assist device of a person, the instructions executable by one or more processors to at least:
- measure a current of a motor of a centrifugal pump in a ventricular assist device;
- determine an estimated flow rate through the centrifugal pump based on the current:
- cause the motor of the centrifugal pump to operate at a first speed when the estimated flow rate is greater than a predetermined flow rate;
- and
- cause the motor of the centrifugal pump to operate at a second speed when the estimated flow rate is less than the predetermined flow rate, wherein the predetermined flowrate is indicative of an actual flow rate through the pump at a crossover point between systole and diastole phases of a person's cardiac cycle.
Dependencies are inferred from the claim text.