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:
a memory; and
processing circuitry in communication with the memory, the processing circuitry configured to:
multiply a number of suction events, of one or more suction events that occurred within a predetermined time period, by a suction event cost to generate a first output;
compare the first output to a predetermined threshold to determine whether a suction condition has occurred;
determine, based on comparing the first output to the predetermined threshold, whether the suction condition has occurred; and
responsive to determining that the suction condition has occurred, control, according to a speed response algorithm, a speed of an impeller of the implantable blood pump to resolve the suction condition.
2. The controller of claim 1 , wherein to determine whether the suction event has occurred, the processing circuitry is further configured to:
multiply a number of non-suction events, of one or more non-suction events that occurred within the predetermined time period, by a non-suction event cost to generate a second output;
add the first output and the second output to generate a third output; and
compare the third output to the predetermined threshold to determine whether the suction condition has occurred.
3. The controller of claim 1 , wherein the predetermined threshold is at least one.
4. The controller of claim 1 , wherein the suction event cost is less than one.
5. The controller of claim 1 , wherein the predetermined threshold is at least 0.
6. The controller of claim 1 , wherein the processing circuitry is configured to determine each suction event of the one or more suctions events over a one-second time period.
7. The controller of claim 1 , wherein the predetermined time period is 30 seconds.
8. A method of operating an implantable blood pump, comprising:
multiplying, by processing circuitry of a controller for the implantable blood pump, a number of suction events, of one or more suction events that occurred within a predetermined time period, by a suction event cost to generate a first output;
comparing, by the processing circuitry, the first output to a predetermined threshold to determine whether a suction condition has occurred;
determining, by the processing circuitry and based on comparing the first output to the predetermined threshold, whether the suction condition has occurred; and
responsive to determining that the suction condition has occurred, controlling, by the processing circuitry and according to a speed response algorithm, a speed of an impeller of the implantable blood pump to resolve the suction condition.
9. The method of claim 8 , wherein determining whether the suction condition has occurred comprises:
multiplying, by the processing circuitry, a number of non-suction events, of one or more non-suction events that occurred within the predetermined time period, by a non-suction event cost to generate a second output;
add the first output and the second output to generate a third output; and
comparing, by the processing circuitry, the third output to the predetermined threshold to determine whether the suction condition has occurred.
10. The method of claim 8 , wherein the predetermined threshold is at least one.
11. The method of claim 8 , wherein the suction event cost is less than one.
12. The method of claim 8 , wherein the predetermined time period is 30 seconds.
13. The method of claim 8 , wherein determining the number of suction events comprises determining, by the processing circuitry, each suction event of the one or more suction events over a one-second time period.
14. A system comprising:
an implantable blood pump;
a power source for the implantable blood pump; and
a controller for the implantable blood pump, comprising:
a memory; and
processing circuitry in communication with the memory, the processing circuitry configured to:
multiply a number of suction events, of one or more suction events that occurred within a predetermined time period, by a suction event cost to generate a first output;
compare the first output to a predetermined threshold to determine whether a suction condition has occurred;
determine, based on comparing the first output to the predetermined threshold, whether the suction condition has occurred; and
responsive to determining that the suction condition has occurred, control, according to a speed response algorithm, a speed of an impeller of the implantable blood pump to resolve the suction condition.
15. The system of claim 14 , wherein to determine whether the suction event has occurred, the processing circuitry is further configured to:
multiply a number of non-suction events, of one or more non-suction events that occurred within the predetermined time period, by a non-suction event cost to generate a second output;
add the first output and the second output to generate a third output; and
compare the third output to the predetermined threshold to determine whether the suction condition has occurred.
16. The system of claim 14 , wherein the predetermined threshold is at least one.
17. The system of claim 14 , wherein the suction event cost is less than one.