Speed change algorithm to resolve suction conditions in lvads
AssigneeMedtronic, Inc.
InventorsD'Anne E. Kudlik, Carlos Reyes, Robert W. Stadler
Life of this patent
Estimating the term…
Abstract
A controller for an implantable blood pump, the implantable blood pump having an impeller. The controller includes processing circuitry configured to reduce a speed of the impeller from a set speed to a first reduced speed if a first predetermined amount of time of detected suction events occurs during a first time interval and increase the speed of the impeller from the first reduced speed if a second predetermined amount of time or less of detected suction events occur during a second time interval and a third predetermined amount of time or less of detected suction events.
Claims20
A blood pump system comprising:
- a blood pump comprising an impeller configured to cause blood to flow in a patient;
- and
- a controller communicatively coupled to the blood pump and comprising processing circuitry configured to:
- reduce a speed of the impeller from a set speed to a first reduced speed in response to determining that a first predetermined amount of time of detected suction events occurred during a first time interval;
- and
- increase the speed of the impeller from the first reduced speed in response to determining that a second predetermined amount of time or less of detected suction events occurred during a second time interval and a third predetermined amount of time or less of detected suction events occurred during third time interval after the reduction of the speed of the impeller from the set speed to the first reduced speed and prior to the increase of the speed of the impeller, wherein a start of the third time interval occurs after a start of the second time interval.
A method of controlling an impeller of a blood pump, the method comprising:
- reducing a speed of the impeller from a set speed to a first reduced speed in response to determining that a first predetermined amount of time of detected suction events occurred during a first time interval;
- and
- increasing the speed of the impeller from the first reduced speed in response to determining that a second predetermined amount of time or less of detected suction events occurred during a second time interval and determining a third predetermined amount of time or less of detected suction events occurred during a third time interval after the reduction of the speed of the impeller from the set speed to the first reduced speed and prior to the increase of the speed of the impeller, wherein a start of the third time interval occurs after a start of the second time interval.
Dependencies are inferred from the claim text.