Granted Patent B2

US 12,440,683 · App. 18/411,882 · Granted Oct 14, 2025

Inventor: Jenna M. S. Pender (Saint Paul, MN)

Assignee: Medtronic, Inc.

A61N1/3706A61N1/025A61N1/36521A61N1/36542A61N1/36585A61N1/37247A61N1/378A61N1/0573

Abstract

Claims (103)

1. A medical device system comprising:

a power source;

therapy delivery circuitry configured to deliver a therapy;

sensing circuitry configured to sense a physiological signal;

a memory configured to store a power capacity difference between a first voltage of the power source and a second voltage of the power source; and

control circuitry configured to:

control the sensing circuitry to sense the physiological signal;

control the therapy delivery circuitry to deliver the therapy based on at least the sensed physiological signal;

measure a voltage of the power source;

determine that the measured voltage of the power source has reached the first voltage;

determine an elapsed time since the measured voltage reached the first voltage;

determine a current drain required from the power source by the sensing circuitry for at least sensing the physiological signal;

determine an estimated power source longevity based on the current drain and the power capacity difference;

adjust the estimated power source longevity by the elapsed time; and

generate an output based on the adjusted estimated power source longevity; and

the memory further configured to store data corresponding to the adjusted estimated power source longevity in response to the output generated by the control circuitry.

2. The medical device system of claim 1 wherein

the control circuitry is further configured to

determine the current drain required from the power source by the sensing circuitry for at least sensing the physiological signal and by the therapy delivery circuitry for delivering the therapy.

3. The medical device system of claim 2 wherein the therapy delivery circuitry comprises pulse generating circuitry configured to deliver electrical stimulation pulses.

4. The medical device system of claim 1 wherein:

the memory is further configured to store a look up table of therapy delivery current drain values for each of a plurality of therapy delivery parameter values;

the control circuitry is further configured to:

control the therapy delivery circuitry to deliver the therapy according to a therapy delivery parameter value of the plurality of therapy delivery parameter values; and

determine the current drain by determining from the look up table a therapy delivery current drain value associated with the therapy delivery parameter value.

5. The medical device system of claim 1 further comprising communication circuitry and wherein:

the control circuitry is further configured to:

determine that the adjusted estimated power source longevity reaches one of a plurality of threshold longevities; and

generate the output by generating a notification in response to the adjusted estimated power source longevity reaching one of a plurality of threshold longevities; and

the communication circuitry being further configured to transmit the notification.

6. The medical device system of claim 5 wherein the control circuitry is further configured to:

determine that the adjusted estimated power source longevity has reached one of the plurality of threshold longevities by determining that the adjusted estimated power source longevity has reached one of:

a recommended replacement time threshold number of days;

an elective replacement threshold number of days; or

an end of service threshold number of days.

7. The medical device system of claim 1 , wherein:

the sensing circuitry comprises a sensor having a plurality of axes each configured to generate an axis signal; and

the control circuitry is further configured to:

control the sensing circuitry to sense the physiological signal by selectively powering on at least one axis of the plurality of axes of the sensor; and

determine the current drain by determining an accumulated time that each axis of the sensor is powered on.

8. The medical device system of claim 7 wherein the sensor comprises a multi-axis accelerometer.

9. The medical device system of claim 1 wherein

the control circuit is further configured to:

control the therapy delivery circuitry to deliver the therapy by delivering electrical stimulation pulses according to a first therapy delivery mode for a first percentage of time;

control the therapy delivery circuitry to deliver the electrical stimulation pulses according to a second therapy delivery mode for a second percentage of time; and

determine the current drain based on at least the first percentage of time.

10. The medical device system of claim 9 wherein the control circuitry is further configured to:

control the therapy delivery circuitry to deliver the electrical stimulation pulses according to the first therapy delivery mode by:

detecting event signals from the physiological signal; and

controlling the therapy delivery circuitry to deliver the electrical stimulation pulses according to the first therapy delivery mode based on the detected event signals; and

control the therapy delivery circuitry to deliver the electrical stimulation pulses according to the second therapy delivery mode without detecting the event signals from the physiological signal.

11. A method comprising:

sensing a physiological signal;

delivering a therapy based on at least the sensed physiological signal;

storing a power capacity difference between a first voltage of a power source and a second voltage of the power source;

measuring a voltage of the power source;

determining that the measured voltage of the power source has reached the first voltage;

determining an elapsed time since the measured voltage reached the first voltage;

determining a current drain required from the power source for at least sensing the physiological signal;

determining an estimated power source longevity based on the current drain and the power capacity difference;

adjusting the estimated power source longevity by the elapsed time;

generating an output based on the adjusted estimated power source longevity; and

storing data corresponding to the adjusted estimated power source longevity in response to the generated output.

12. The method of claim 11 further comprising:

determining the current drain required from the power source for at least sensing the physiological signal and for delivering the therapy.

13. The method of claim 12 wherein delivering the therapy comprises delivering electrical stimulation pulses.

14. The method of claim 11 further comprising:

storing a look up table of therapy delivery current drain values for each of a plurality of therapy delivery parameter values;

delivering the therapy according to a therapy delivery parameter value of the plurality of therapy delivery parameter values; and

determining the current drain by determining from the look up table a therapy delivery current drain value associated with the therapy delivery parameter value.

15. The method of claim 11 further comprising:

determining that the adjusted estimated power source longevity reaches one of a plurality of threshold longevities;

generating the output by generating a notification in response to the adjusted estimated power source longevity reaching one of a plurality of threshold longevities; and

transmitting the notification.

16. The method of claim 15 further comprising:

determining that the adjusted estimated power source longevity has reached one of the plurality of threshold longevities by determining that the adjusted estimated power source longevity has reached one of:

a recommended replacement time threshold number of days;

an elective replacement threshold number of days; or

an end of service threshold number of days.

17. The method of claim 11 further comprising:

sensing the physiological signal by selectively powering on at least one axis of a plurality of axes of a sensor; and

determining the current drain by determining an accumulated time that each axis of the sensor is powered on.

18. The method of claim 17 wherein sensing the physiological signal comprises selectively powering on at least one axis of a plurality of axes of a multi-axis accelerometer.

19. The method of claim 11 further comprising:

delivering the therapy by delivering electrical stimulation pulses according to a first therapy delivery mode for a first percentage of time;

delivering electrical stimulation pulses according to a second therapy delivery mode for a second percentage of time; and

determining the current drain based on at least the first percentage of time.

20. The method of claim 19 further comprising:

delivering the electrical stimulation pulses according to the first therapy delivery mode by:

detecting event signals from the physiological signal; and

delivering the electrical stimulation pulses according to the first therapy delivery mode based on the detected event signals; and

delivering the electrical stimulation pulses according to the second therapy delivery mode without detecting the event signals from the physiological signal.

21. A non-transitory computer readable medium storing a power capacity difference between a first voltage of a power source and a second voltage of the power source and storing a set of instructions that, when executed by control circuitry of a medical device system, cause the medical device system to:

sense a physiological signal;

deliver a therapy based on at least the sensed physiological signal;

measure a voltage of the power source;

determine that the measured voltage of the power source has reached the first voltage;

determine an elapsed time since the measured voltage reached the first voltage;

determine a current drain required from the power source for at least sensing the physiological signal;

determine an estimated power source longevity based on the current drain and the power capacity difference;

adjust the estimated power source longevity by the elapsed time;

generate an output based on the adjusted estimated power source longevity; and

store data corresponding to the adjusted estimated power source longevity in response to the generated output.

Assignments (1)

Continuity (3)

References Cited (26)