Pressure/flow characteristic modification of a centrifugal pump in a ventricular assist device
First Claim
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1. 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.
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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.
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Citations
15 Claims
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1. A ventricular assist device comprising:
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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.
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2. A method of controlling a centrifugal pump in a ventricular assist device of a person, wherein the method comprises:
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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. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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. - View Dependent Claims (13)
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14. 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:
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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. - View Dependent Claims (15)
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Specification