Posture and body movement measuring system

• US 7,210,240 B2
• Filed: 12/24/2004
• Issued: 05/01/2007
• Est. Priority Date: 02/23/2001
• Status: Expired due to Term

• Current Assignee: Lord Corporation (Parker-Hannifin Corporation)
• Original Assignee: MicroStrain, Inc. (Spectris PLC)
• Inventors: Arms, Steven W., Townsend, Christopher P.
• Primary Examiner(s): Bennett; G. Bradley
• Assistant Examiner(s): Cohen; Amy R.
• Application Number:
  US11/023,107
• Publication Number:
  US 20050126026A1
• Time in Patent Office: 858 Days
• Field of Search: 335/12, 333/65, 333/661.1, 333/661.2, 333/661.3, 333/661.4, 333/662.5, 333/662.6, 33370-373, 33340-343, 600/301, 428/8
• US Class Current: 33/512
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4561 Evaluating static posture, e.g. undesirable back curvature A61B5/1116 takes precedence
• CPC Class Codes: A61B 5/486 Bio-feedback A61B5/375 takes precedence
• CPC Class Codes: A61B 5/6823 Trunk, e.g., chest, back, abdomen, hip
• CPC Class Codes: A61B 5/6828 Leg

Abstract

A sensing device is attached to a living subject that includes a first sensors for distinguishing lying, sitting, and standing positions. In another embodiment, sensor data is stored in a storage device as a function of time. Multiple points or multiple intervals of the time dependent data are used to direct a feedback mechanism to provide information or instruction in response to the time dependent output indicating too little activity, too much time with a joint not being moved beyond a specified range of motion, too many motions beyond a specified range of motion, or repetitive activity that can cause repetitive stress injury.

Claims

1. A device for communicating to a user, comprising a solid state sensor, a processor, a non-volatile storage device, and a feedback mechanism, wherein said solid state sensor, said processor, and said non-volatile storage device are for mounting on the user, wherein data from said sensor is processed in said processor to provide an output, wherein said output is stored in said non-volatile storage device as a function of time, and wherein multiple points of said time dependent output stored in said non-volatile storage device are processed in said processor, wherein said feedback mechanism includes a device for communicating with the user, wherein said processor is programmed to direct said feedback mechanism to commnunicate to the user at least one from the group including information and instruction in response to said multiple points of time dependent output indicating at least one from the group including inactivity, activity of a joint during an interval of time that is less than a preset level of activity, a range of motion of a joint during an interval of time that is less than a preset range of motion, and vibration during an interval of time that is greater than a preset amount of vibration, wherein said sensor includes an inclination measuring device.

2. A device as recited in claim 1, wherein said inclination measuring device comprises a dc accelerometer.

3. A device as recited in claim 2, wherein said inclination measuring device comprises three aecelerometers orthogonally mounted.

4. A device as recited in claim 2, wherein said inclination measuring device further comprises a magnetometer.

5. A device as recited in claim 4, wherein said inclination measuring device comprises a plurality of magnetometers.

6. A device as recited in claim 4, wherein said magnetometer is for providing direction with respect to the earth'"'"'s magnetic field.

7. A device as recited in claim 1, further comprising a network of solid state sensors.

8. A device as recited in claim 7, wherein a first solid state sensor of said network of solid state sensors is for placing on a first body segment of the user and a second solid state sensor of said network of solid state sensors is for placing on a second body segment connected to said first body segment.

9. A device as recited in claim 8, wherein data from said first sensor is subtracted from data from said second sensor to provide angle of a joint there between.

10. A device as recited in claim 8, wherein said first sensor and said second sensor are for measuring range of motion of said second body segment with respect to said first body segment.

11. A device as recited in claim 10, wherein data from said range of motion measurement is analyzed for change of range of motion over time.

12. A device as recited in claim 10, wherein an initial values of said time dependent data is tared out for said first sensor and said second sensor to provide change from said initial value.

13. A device as recited in claim 8, wherein said first and said second sensors comprise inclination measuring devices, wherein said processor uses inclination data from said first and second sensors for determining body posture in sitting position.

14. A device as recited in claim 1, wherein said storage device comprises a solid state device.

15. A device as recited in claim 1, further comprising a housing, wherein said sensor, said storage device, said processor, and said feedback mechanism are all within said housing.

16. A device as recited in claim 1, further comprising a housing separate from said sensor, wherein said feedback mechanism is within said separate housing.

17. A device as recited in claim 16, wherein said sensor is wirelessly connected to said housing containing said feedback mechanism.

18. A device as recited in claim 17, wherein said wireless connection is an RF connection.

19. A device as recited in claim 1, wherein said processor is programmed to activate said feedback mechanism if a preset range of motion threshold has been exceeded more than a specified number of times.

20. A device as recited in claim 1, wherein said feedback mechanism provides vibratory or auditory feedback.

21. A device as recited in claim 1, wherein said feedback mechanism comprises a piezo-electric buzzer or an electromagnetic shaker.

22. A device as recited in claim 1, wherein said feedback mechanism includes a vibratory or audio signal to provide feedback to warn of a problem, discourage a movement, support a desired result, or encourage a movement.

23. A device as recited in claim 22, wherein said processor is programmed to provide feedback if the living subject repeatedly exceeds a pre-programmed inclination angle.

24. A device as recited in claim 1, wherein said processor comprises a microprocessor, a signal processor, or a personal computer.

25. A device as recited in claim 1, wherein said output comprises body segment orientation data as a function of time.

26. A device as recited in claim 1, wherein said output comprises posture data as a function of time.

27. A device as recited in claim 1, wherein said output provides data for use to adjust physical therapy.

28. A device as recited in claim 1, wherein said device further comprises a data entry system.

29. A device as recited in claim 28, wherein said data entry system comprises a button.

30. A device as recited in claim 28, wherein said data entry system includes an input unit for recording the presence of pain.

31. A device as recited in claim 28, wherein at least one from the group consisting of time, date or and other data are recorded when said data entry system is used.

32. A device as recited in claim 1, wherein said output is displayed as a histogram showing number of inclinations at each angle range during a time period.

33. A device as recited in claim 1, wherein said output is displayed as inclination v. time.

34. A device as recited in claim 1, further comprising a digital filter.

35. A device as recited in claim 34, wherein said digital filter is for reducing effect of linear accelerations on the data.

36. A device as recited in claim 34, wherein said digital fitter comprises a low pass filter.

37. A device as recited in claim 1, wherein said sensor comprises accelerometers, further comprising a high pass filter, wherein output of said accelerometers that passes through said high pass filter is subsequently integrated and used to compute a resultant velocity which is used to calculate energy used.

38. A device as recited in claim 1, wherein said device is wearable.

39. A device as recited in claim 1, wherein said device records output over a series of intervals of time.

40. A device as recited in claim 1, further comprising at least one additional sensor for attaching to the subject for distinguishing lying, sitting, and standing positions.

41. A device as recited in claim 40, wherein said at least one additional sensor includes a solid state inclination measuring device for determining inclination with respect to the gravity vector.

42. A device as recited in claim 41, wherein said at least one additional sensor includes a first inclination measuring device and a second inclination measuring device, said first inclination measuring device for attaching to a first body segment above a joint, said second inclination measuring device for attaching to a second body segment below said joint.

43. A device as recited in claim 42, wherein said joint is a hip joint.

44. A device as recited in claim 1, further comprising a sensor for detecting a posture based on curvature of the spine.

45. A device as recited in claim 44, wherein said sensor is capable of detecting a kyphotic curvature of the spine.

46. A device as recited in claim 45, wherein said processor is programmed to measure the time the subject has said kyphotic curvature of the spine and determines whether said time exceeds a preset value, and wherein said processor is further programmed to prompt the subject to move if said time exceeds said preset value.