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
Claims21
A controller for an implantable blood pump, the implantable blood pump having an impeller, the controller comprising:
- 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 occur during a period of time immediately prior to a speed increase.
A method of controlling operating of an implantable blood pump, the implantable blood pump having an impeller, the method comprising:
- reducing 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
- increasing the speed of the impeller from the first reduced speed if:
- a second predetermined amount of time or less of detected suction events occurs during a second time interval;
- and
- a third predetermined amount of time or less of detected suction events occur during a period of time immediately prior to a speed increase.
A controller for an implantable blood pump, the implantable blood pump having an impeller, the controller comprising:
- 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;
- increase the speed of the impeller from the first reduced speed if:
- five seconds or less of detected suction events occurs during a 60 second interval;
- and
- zero seconds of detected suction events occur during a 10 second period time immediately prior to a speed increase;
- and
- reduce a speed of the impeller from the first reduced speed to a second reduced speed if the first predetermined amount of time of detected suction events occurs during the first time interval following a reduction of speed from the set speed to the first reduced speed.
A controller for an implantable blood pump, the implantable blood pump having an impeller, the controller comprising:
- 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 predetermined number of cardiac cycles;
- 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 predetermined number of cardiac cycles;
- and
- a third predetermined amount of time or less of detected suction events occur during a cardiac cycle immediately prior to a speed increase.
Dependencies are inferred from the claim text.