Systems and methods for extending the life of an implanted pulse generator battery

• US 9,884,198 B2
• Filed: 10/19/2015
• Issued: 02/06/2018
• Est. Priority Date: 10/22/2014
• Status: Active Grant

• Current Assignee: Nevro Corporation
• Original Assignee: Nevro Corporation
• Inventors: Parker, Jon
• Primary Examiner(s): Bertram, Eric D.
• Application Number:
  US14/887,251
• Publication Number:
  US 20160114171A1
• Time in Patent Office: 841 Days
• CPC Class Codes: A61N 1/36071 Pain
• CPC Class Codes: A61N 1/37217 characterised by the communication link, e.g. acoustic or tactile
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Systems and methods for extending the life of an implanted pulse generator battery are disclosed. A representative method for establishing charge parameters for a battery-powered implantable medical device includes receiving a patient-specific therapy signal parameter and, based at least in part on the patient-specific therapy signal parameter, determining a discharge rate for a battery of the implanted medical device. The method can further include determining a therapy run time, based at least in part on the discharge rate. The method can still further include determining at least one battery charging parameter, based at least in part on the run time.

Claims

1. A method for establishing charge parameters for a battery-powered implantable medical device, comprising:

receiving a patient-specific therapy signal parameter;

based at least in part on the patient-specific therapy signal parameter, determining a discharge rate for a battery of the implantable medical device;

based at least in part on the discharge rate, determining a therapy run time;

based at least in part on the therapy run time, determining at least one battery charging parameter; and

charging the battery of the implantable medical device using the determined at least on battery charging parameter.

2. The method of claim 1 wherein the process of receiving the at least one patient-specific therapy signal parameter is performed by the implantable medical device.

3. The method of claim 1 wherein the patient-specific therapy signal parameter includes a therapy signal amplitude.

4. The method of claim 1 wherein the patient-specific therapy signal parameter includes a therapy signal pulse width.

5. The method of claim 1 wherein the patient-specific therapy signal parameter includes a therapy signal duty cycle.

6. The method of claim 1 wherein the patient-specific therapy signal parameter includes at least one of a therapy on time and a therapy off time.

7. The method of claim 1 wherein the patient-specific therapy signal parameter includes an impedance of a circuit or element of a circuit used to deliver therapy to the patient.

8. The method of claim 1, further comprising:

receiving at least one charging characteristic, the at least one charging characteristic including at least one of a battery-specific battery characteristic or a patient-specific charging characteristic; and

wherein determining the therapy run time includes determining the therapy run time based at least in part on the at least one charging characteristic.

9. The method of claim 8 wherein the patient-specific charging characteristic includes a patient-specific charging interval.

10. The method of claim 8 wherein the patient-specific charging characteristic includes a patient-specific charging frequency.

11. The method of claim 8 wherein the patient-specific charging characteristic includes a patient-specific charging consistency.

12. The method of claim 8 wherein the battery-specific battery characteristic includes an age of the battery.

13. The method of claim 8 wherein the battery-specific battery characteristic includes a number of charging cycles undergone by the battery.

14. The method of claim 1 wherein the at least one charging parameter includes an end-of-charge limit.

15. The method of claim 14 wherein the end-of-charge limit includes a voltage limit at which a constant current phase of a charging process ceases.

16. The method of claim 1, further comprising, based at least in part on the discharge rate and the therapy run time, determining at least one battery discharge parameter.

17. The method of claim 16 wherein the at least one battery discharge parameter includes a charge capacity limit below which a low charge indication is directed.

18. The method of claim 1, wherein the pulse generator is programmed with instructions that, when executed:

receive an indication corresponding to an upcoming charging event that includes placing the battery in a storage state;

determine if a charge state of the battery is within a target charge range;

if the charge state is above the target charge range, (a) automatically discharge the battery at least until the battery is at or within the target charge range, or (b) automatically provide an indication that the battery is to be discharged prior to storage, or both (a) and (b); and

if the charge state is below the target charge range, (c) automatically charge the battery at least until the battery is at or within the target charge range, or (d) automatically provide an indication that the battery is to be charged, or both (c) and (d).

19. The method of claim 18 wherein the indication corresponding to the upcoming charging event includes an indication of a period of time for which the battery is to be stored.

20. The method of claim 18, wherein the pulse generator is programmed with instructions that, when executed, provide an indication that the battery is at or within the target charge range.

21. A method for establishing charge parameters for a battery-powered implantable medical device, comprising:

receiving, at the battery-powered implantable medical device, a patient-specific therapy signal amplitude;

based on a therapy signal frequency value, a therapy pulse width and the patient-specific therapy signal amplitude, determining a discharge rate for a battery of the implantable medical device;

receiving, at the battery-powered implantable medical device, a battery-specific battery characteristic that includes a battery-specific number of prior charging cycles;

receiving, at the battery-powered implantable medical device, a patient-specific charging characteristic that includes a charging frequency value;

based on the discharge rate, the battery-specific battery characteristic, and the charging characteristic, determining a run time;

based at least in part on the discharge rate and the run time, determining at least one battery charging parameter; and

charging the battery of the implantable medical device using the determined at least one battery charging parameter.

22. The method of claim 21 wherein the at least one battery charging parameter includes a voltage limit at which a constant current phase of a charging process ceases.

23. The method of claim 21, further comprising recording the multiple prior intervals between charging events for the battery at the implantable pulse generator.

24. A method for programming a battery-powered implantable medical device, comprising:

programming the implantable medical device with instructions that, when executed;

receive at least one patient-specific therapy signal parameter;

direct a patient therapy signal to a signal delivery device in accordance with the at least one patient-specific therapy signal parameter;

based at least on the at least one patient-specific therapy signal parameter, determine a discharge rate for a battery of the implantable medical device;

based at least in part on the discharge rate, determine a therapy run time;

based at least in part on the therapy run time, determine at least one battery charging parameter; and

charge the battery of the implantable medical device using the determined at least one battery charging parameter.

25. The method of claim 24 wherein the patient-specific therapy signal parameter includes a therapy signal amplitude.

26. The method of claim 24 wherein the patient-specific therapy signal parameter includes a therapy signal pulse width.

27. The method of claim 24 wherein the patient-specific therapy signal parameter includes a therapy signal duty cycle.

28. The method of claim 24, further comprising:

receiving at least one charging characteristic, the at least one charging characteristic including at least one of a battery-specific battery characteristic or a patient-specific charging characteristic; and

wherein determining the therapy run time includes determining the therapy run time based at least in part on the at least one charging characteristic.

29. The method of claim 28 wherein the patient-specific charging characteristic includes a patient-specific charging frequency.

30. The method of claim 28 wherein the patient-specific charging characteristic includes a patient-specific charging consistency.

31. An implantable medical device, comprising:

an implantable housing; and

a pulse generator carried by the housing, the pulse generator being programmed with instructions that, when executed;

receive at least one patient-specific therapy signal parameter;

direct a patient therapy signal to a signal delivery device in accordance with the at least one patient-specific therapy signal parameter;

based at least on the at least one patient-specific therapy signal parameter, determine a discharge rate for a battery of the implantable medical device;

based at least in part on the discharge rate, determine a therapy run time;

based at least in part on the therapy run time, determine at least one battery charging parameter; and

charge the battery of the implantable medical device using the determined at least one battery charging parameter.

32. The device of claim 31 wherein the patient-specific therapy signal parameter includes a therapy signal amplitude.

33. The device of claim 31 wherein the patient-specific therapy signal parameter includes a therapy signal pulse width.

34. The device of claim 31 wherein the patient-specific therapy signal parameter includes a therapy signal duty cycle.

35. The device of claim 31 wherein the pulse generator is programmed with instructions that, when executed:

receive at least one charging characteristic, the at least one charging characteristic including at least one of a battery-specific battery characteristic or a patient-specific charging characteristic; and

wherein determining the therapy run time includes determining the therapy run time based at least in part on the at least one charging characteristic.

36. The device of claim 35 wherein the patient-specific charging characteristic includes a patient-specific charging frequency.

37. The device of claim 35 wherein the patient-specific charging characteristic includes a patient-specific charging consistency.

38. The device of claim 31, wherein the pulse generator is programmed with instructions that, when executed:

receive an indication corresponding to an upcoming charging event that includes placing the battery in a storage state;

determine if a charge state of the battery is within a target charge range;

if the charge state is above the target charge range, (a) automatically provide an indication that the battery is to be discharged prior to storage, or (b) automatically discharge the battery at least until the battery is at or within the target charge range, or both (a) and (b); and

if the charge state is below the charge range, (c) automatically provide an indication that the battery is to be charged, or (d) automatically charge the battery at least until the battery is at or within the charge range, or both (c) and (d).

39. The system of claim 38 wherein the pulse generator includes circuitry configured to generate a therapy signal, and wherein the system further comprises:

an interrupt device coupled between the circuitry and the battery, the interrupt device being configured to interrupt power from the battery to the circuitry after the charge state of the battery is determined, the interrupt device being configured to restore power from the battery to the circuitry in response to a charging event.