Adjustment of therapy based on acceleration

• US 9,737,719 B2
• Filed: 04/26/2012
• Issued: 08/22/2017
• Est. Priority Date: 04/26/2012
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Skelton, Dennis M., Poletto, Christopher, Panken, Eric J.
• Primary Examiner(s): Moran, Edward
• Assistant Examiner(s): Bays, Pamela M
• Application Number:
  US13/457,104
• Publication Number:
  US 20130289652A1
• Time in Patent Office: 1,944 Days
• Field of Search: 607 2, 607 6, 607 18, 607 19, 607 62
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/369 Electroencephalography [EEG] devices for psychotechnics A61B5/16
• CPC Class Codes: A61B 5/389 Electromyography [EMG]
• CPC Class Codes: A61N 1/36071 Pain
• CPC Class Codes: A61N 1/36139 with automatic adjustment
• CPC Class Codes: A61N 1/36146 specified by the stimulation parameters
• CPC Class Codes: A61N 1/36153 Voltage A61N1/3616 takes precedence
• CPC Class Codes: A61N 1/36171 Frequency
• CPC Class Codes: A61N 1/36175 Pulse width or duty cycle
• CPC Class Codes: A61N 1/36185 Selection of the electrode configuration
• CPC Class Codes: A61N 1/36535 controlled by body position or posture
• CPC Class Codes: A61N 1/36542 controlled by body motion, e.g. acceleration

Abstract

A medical device provides stimulation therapy to a patient based on a set of therapy parameters. One or more therapy parameters may be automatically adjusted based on acceleration forces detected by a sensor, the acceleration forces being applied to the patient. In some examples, adjustments to one or more therapy parameter may be made based on an algorithm. The algorithm may be defined by acceleration and therapy parameter value pairs associated with opposite patient positions.

Claims

1. A method comprising:

receiving, by a processor, data representative of a first therapy parameter value for delivery of a therapy while a patient is in a first position, the first therapy parameter value associated with a first acceleration value, and a second therapy parameter value for delivery of the therapy while the patient is in a second position, the second therapy parameter value associated with a second acceleration value, wherein the first position is opposite the second position;

sensing, by an acceleration sensor, a third acceleration value;

generating, by the processor, a third therapy parameter value for delivery of a therapy to a patient based on an algorithm defined as a function of the first therapy parameter value and the second therapy parameter value, and a relationship of the third acceleration value to the first and second acceleration values; and

controlling, by a therapy delivery device, a medical device to deliver the therapy to the patient based on the third therapy parameter value.

2. The method of claim 1, further comprising:

sensing the first acceleration value from the acceleration sensor while the patient is in the first position;

receiving a first therapy parameter value for delivery of the therapy to the patient while the patient is in the first position;

associating the first therapy parameter value with the first acceleration value;

sensing the second acceleration value from the acceleration sensor while the patient is in the second position;

receiving the second therapy parameter value for delivery of the therapy to the patient while the patient is in the second position; and

associating the second therapy parameter value with the second acceleration value.

3. The method of claim 2, wherein the first therapy parameter value and the second therapy parameter value are generated based on patient feedback.

4. The method of claim 2, wherein the acceleration sensor is a single-axis accelerometer, the first acceleration vector value is 1G, and the second acceleration vector value is −

1G.

5. The method of claim 4, wherein the third acceleration value is greater than 1G.

6. The method of claim 4, wherein the third acceleration value is between 1G and −

1G.

7. The method of claim 2, further comprising selecting a first direction of the acceleration sensor for determination of the first and second acceleration values.

8. The method of claim 7, wherein the selection is based on an effect of spinal cord movement in a second direction and a third direction on the third therapy parameter value, the second and third directions being perpendicular to the first direction.

9. The method of claim 8, wherein the acceleration sensor is a single axis accelerometer, and wherein the axis of the single axis accelerometer aligns with the first direction.

10. The method of claim 8, wherein the acceleration sensor is a single axis accelerometer, and wherein the axis of the single axis accelerometer does not align with the first direction, the second direction, or the third direction.

11. The method of claim 1, wherein the third therapy parameter value is a stimulation amplitude value generated based on the formula

12. The method of claim 1, wherein the first position is a prone position and the second position is a supine position.

13. The method of claim 1, wherein the first position and the second position are at least one of the following opposing patient position pairs:

supine and prone,

left side and right side, and

upright and upside down.

14. The method of claim 13, wherein the opposing patient position pair is selected based on an axis of interest.

15. The method of claim 1, wherein the therapy is electrical stimulation therapy.

16. A medical device system comprising:

an acceleration sensor configured to detect a first acceleration value while a patient is in a first position, a second acceleration value while the patient is in a second position, and a third acceleration value while the patient is in a third position, the first position opposite the second position;

a processor configured to;

receive data representative of a first therapy parameter value for delivery of a therapy while the patient is in the first position, the first therapy parameter value associated with the first acceleration value, and a second therapy parameter value for delivery of therapy while the patient is in the second position, the second therapy parameter value associated with the second acceleration value, and

generate a third therapy parameter value for delivery of a therapy to the patient based on an algorithm defined as a function of the first therapy parameter value and the second therapy parameter value, and a relationship of the third acceleration value to the first and second acceleration values; and

a therapy delivery module configured to deliver the therapy to the patient based on the third parameter value.

17. The system of claim 16, wherein the processor is further configured to:

receive the first therapy parameter value while the patient is in the first position;

associate the first therapy parameter value with the first acceleration value;

receive the second therapy parameter value while the patient is in the second position; and

associate the second therapy parameter value with the second acceleration value.

18. The system of claim 16, wherein the third therapy parameter value is generated based on the formula

19. The system of claim 18, further comprising a programmer configured to receive patient feedback and wherein the first therapy parameter value and the second therapy parameter value are generated based on patient feedback.

20. The system of claim 19, wherein the acceleration sensor is a single axis accelerometer, the first acceleration vector value is 1G, and the second acceleration vector value is −

1G.

21. The system of claim 19, wherein the third acceleration value is between 1G and −

1G.

22. The system of claim 19, wherein the third acceleration value is greater than 1G.

23. The system of claim 18, wherein the third therapy parameter value is an electrical current amplitude.

24. The system of claim 16, wherein the first position is a prone position and the second position is a supine position.

25. The system of claim 16, wherein the processor is further configured to select a first direction of the acceleration sensor for determination of the first and second acceleration values.

26. The system of claim 25, wherein the selection is based on an effect of spinal cord movement in a second and third direction on the third therapy parameter value, the second and third directions perpendicular to the first direction.

27. The system of claim 26, wherein the acceleration sensor is a single axis accelerometer, and wherein the axis of the single axis accelerometer aligns with the first direction.

28. The system of claim 26, wherein the acceleration sensor is a single axis accelerometer and wherein the axis of the single axis accelerometer does not align with the first direction, the second direction, or the third direction.

29. The system of claim 16, wherein the first position and the second position are at least one of opposing position pairs:

supine and prone,

left side and right side, and

upright and upside down.

30. The system of claim 29, wherein the processor is further configured to select the opposing patient position pair based on an axis of interest.

31. The system of claim 16, wherein the therapy delivery module is further configured to deliver electrical stimulation therapy.

32. The system of claim 16, wherein the acceleration sensor is further configured to:

detect a fourth acceleration value while the patient is in fourth position, and a fifth acceleration value while the patient is in a fifth position, the fourth position opposite the fifth position, and the first and second positions different than the fourth and fifth positions, and

the processor is further configured to;

receive data representative of a fourth therapy parameter value for delivery of the therapy while the patient is in the fourth position, the fourth therapy parameter value associated with the fourth acceleration value, and a fifth therapy parameter value for delivery of the therapy while the patient is in the fifth position, the fifth therapy parameter value associated with the fifth acceleration value, and

generate the third therapy parameter value for delivery of the therapy to the patient based on the first therapy parameter value, the second therapy parameter value, the fourth therapy parameter value, the fifth therapy parameter value, the relationship of the third acceleration value to the first and second acceleration values, and a relationship of the third acceleration value to the fourth and fifth acceleration values.

33. The system of claim 32, wherein the third therapy parameter value is generated based on the formula

34. A non-transitory computer-readable medium comprising instructions for causing a programmable processor to:

receive, by the processor, data representative of a first therapy parameter value for delivery of a therapy while a patient is in a first position, the first therapy parameter value associated with a first acceleration value generated by an acceleration sensor, and a second therapy parameter value for delivery of the therapy while the patient is in a second position, the second therapy parameter value associated with a second acceleration value generated by the acceleration sensor, wherein the first position is opposite the second position;

receive, by the processor, a third acceleration value;

generate, by the processor, a third therapy parameter value for delivery of the therapy to the patient based on an algorithm defined as a function of the first therapy parameter value and the second therapy parameter value, and a relationship of the third acceleration value to the first and second acceleration values; and

control a therapy delivery module of a medical device to deliver the therapy to the patient based on the third therapy parameter value.

35. A system comprising:

means for receiving, by a processor, data representative of a first therapy parameter value for delivery of a therapy while a patient is in a first position, the first therapy parameter value associated with a first acceleration value generated by an acceleration sensor, and a second therapy parameter value for delivery of the therapy while the patient is in a second position, the second therapy parameter value associated with a second acceleration value generated by the acceleration sensor, wherein the first position is opposite the second position;

means for sensing, by the processor, a third acceleration value;

means for generating, by the processor, a third therapy parameter value for delivery of a therapy to a patient based on an algorithm defined as a function of the first therapy parameter value and the second therapy parameter value, and a relationship of the third acceleration value to the first and second acceleration values; and

means for controlling a therapy delivery module of a medical device to deliver the therapy to the patient based on the third therapy parameter value.