Cost function for response algorithm
A controller for an implantable blood pump includes processing circuitry configured to initiate a suction response algorithm if a combination of a number of detected suction events multiplied by a suction event variable and a number of non-suction events multiplied by a non-suction event variable exceed a predetermined threshold.
1. A controller for an implantable blood pump, comprising:
processing circuitry configured to:
determine a number of suction events that occurred within a predetermined time interval;
determine a number of non-suction events that occurred within the predetermined time interval;
determine, based on the number of suction events and the number of non-suction events, whether a suction condition has occurred; and
responsive to determining that the suction condition has occurred, control a speed of an impeller of the implantable blood pump according to a speed response algorithm.
2. The controller of claim 1 , wherein the processing circuitry is configured to determine each suction event and non-suction event over a one-second time period.
3. The controller of claim 1 , wherein the predetermined time interval is 30 seconds.
4. The controller of claim 1 , wherein the processing circuitry is configured to determine that the suction condition has occurred based on an equation x 1 *S+x 2 *N>y, wherein x 1 is a suction event variable, S is the number of suction events, x 2 is a non-suction event variable, N is the number of non-suction events, and y is a predetermined threshold.
5. The controller of claim 4 , wherein the predetermined threshold is at least 0.
6. The controller of claim 4 , wherein the predetermined threshold is at least one.
7. The controller of claim 4 , wherein the suction event variable is less than one.
8. The controller of claim 7 , wherein the suction event variable is 0.2.
9. The controller of claim 4 , wherein the non-suction event variable is less than one.
10. The controller of claim 9 , wherein the non-suction event variable is 0.05.
11. A method of operating an implantable blood pump, comprising:
determining, by processing circuitry of a controller for the implantable blood pump, a number of suction events that occurred within a predetermined time interval;
determining, by the processing circuitry, a number of non-suction events that occurred within the predetermined time interval;
determining, by the processing circuitry and based on the number of suction events and the number of non-suction events, whether a suction condition has occurred; and
responsive to determining that the suction condition has occurred, controlling, by the processing circuitry, a speed of an impeller of the implantable blood pump according to a speed response algorithm.
12. The method of claim 11 , wherein the predetermined time interval is 30 seconds.
13. The method of claim 11 , wherein determining the number of suction events comprises determining, by the processing circuitry, each suction event over a first one-second time period, and wherein determining the number of non-suction events comprises determining, by the processing circuitry, each non-suction event over a second one-second time period.
14. The method of claim 11 , wherein determining whether the suction condition has occurred comprises determining that the suction condition has occurred based on equation x 1 *S+x 2 *N>y, wherein x 1 is a suction event variable, S is the number of suction events, x 2 is a non-suction event variable, N is the number of non-suction events, and y is a predetermined threshold.
15. The method of claim 14 , wherein the predetermined threshold is at least one.
16. The method of claim 14 , wherein the suction event variable is less than one.
17. The method of claim 16 , wherein the suction event variable is 0.2.
18. The method of claim 14 , wherein the non-suction event variable is less than one.
19. The method of claim 18 , wherein the non-suction event variable is 0.05.
20. A controller for an implantable blood pump, comprising:
processing circuitry configured to:
determine a number of suction events that occurred within a predetermined time interval;
determine a number of non-suction events that occurred within the predetermined time interval;
determine that a suction condition has occurred based on an equation x 1 *S+x 2 *N>1, wherein x 1 is a suction event variable, S is the number of suction events, x 2 is a non-suction event variable, N is the number of non-suction events; and
responsive to determining that the suction condition has occurred, control a speed of an impeller of the implantable blood pump according to a speed response algorithm.