Posture and body movement measuring system

• US 6,834,436 B2
• Filed: 02/23/2002
• Issued: 12/28/2004
• 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): Fulton, Christopher W.
• Assistant Examiner(s): JOHNSON, AMY COHEN
• Application Number:
  US10/082,562
• Publication Number:
  US 20020170193A1
• Time in Patent Office: 1,039 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, 333/70--73, 333/40--43, 333/47, 600/301, 482/8
• 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 attaching to a living subject having a joint, comprising a first sensor, a second sensor, a processor, and a non-volatile storage device, said first sensor for attaching to a first body segment above the joint, said second sensor for attaching to a second body segment below the joint, wherein said first sensor and said second sensor each comprise a solid state inclination measuring device for determining inclination with respect to the gravity vector, wherein said inclinations with respect to the gravity vector determined from said first sensor and from said second sensor are processed in said processor and stored in said non-volatile storage for distinguishing lying, sitting, and standing positions, wherein said processor and said non-volatile storage device are part of the device for attaching to the living subject.

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

3. A device as recited in claim 1, wherein said inclination measuring device comprises three accelerometers orthogonally mounted.

4. A device as recited in claim 1, wherein said inclination measuring device further comprises a magnetometer.

5. A device as recited in claim 1, wherein said inclination measuring device comprises a plurality of magnetometers.

6. A device as recited in claim 5, wherein data from said magnetometers is for providing direction with respect to the earth'"'"'s magnetic field.

7. A device as recited in claim 1, wherein data from said first sensor is subtracted from data from said second sensor.

8. A device as recited in claim 7, wherein said subtraction is to determine a difference in orientation.

9. A device as recited in claim 7, 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.

10. A device as recited in claim 9, wherein data from said range of motion measurement is analyzed for change of range of motion over time.

11. A device as recited in claim 10, wherein initial values of said time dependent data are tared out to provide change from said initial values.

12. A device as recited in claim 1, wherein said non-volatile storage device comprises a solid state device.

13. A device as recited in claim 12, wherein said non-volatile storage device comprises a non-volatile memory chip.

14. A device as recited in claim 1, further comprising a feedback mechanism.

15. A device as recited in claim 14, further comprising a housing, wherein said first sensor, said storage device, said processor, and said feedback mechanism are all within said housing.

16. A device as recited in claim 14, further comprising a housing separate from said first sensor and said second sensor, wherein said feedback mechanism is within said housing.

17. A device as recited in claim 16, wherein said first sensor and said second sensor are 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 14, 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 14, wherein said feedback mechanism includes a vibrator.

21. A device as recited in claim 14, wherein said feedback mechanism comprises a piezo-electric buzzer or an electromagnetic shaker.

22. A device as recited in claim 14, wherein said feedback mechanism includes a vibratory or audio signal to provide feedback to provide one or more of the following;

warn of a problem, discourage a movement, support a desired result, and 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 data from said inclination determination comprises body segment inclination data as a function of time.

26. A device as recited in claim 1, wherein data from said inclination determination comprises posture date as a function of time.

27. A device as recited in claim 1, further comprising an output to provide data from said inclination determination 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 one or more of the following data are recorded when said data entry system is used;

time, date, and other data.

32. A device as recited in claim 1, further comprising a program for displaying data from said inclination determination as a histogram showing number of inclinations at each angle range during a time period.

33. A device as recited in claim 1, further comprising a program for displaying data from said inclination determination 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 device may be subject to linear accelerations, wherein said digital filter is for reducing effect of said linear accelerations on the data.

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

37. A device as recited in claim 1, wherein said inclination measuring device comprises dc accelerometers, wherein said device further comprises 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 processor uses inclination data from said first and second sensors for determining body posture in said sitting position.

39. A device as recited in claim 1, wherein said joint is a hip joint.

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

41. A device as recited in claim 40, wherein said sensor is capable of detecting a kyphotic curvature of the spine.

42. A device as recited in claim 41, 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.

43. A device as recited in claim 1, wherein said processor uses inclination data from said first and second sensors for distinguishing bending in one said position.

44. A device as recited in claim 1, wherein said processor uses inclination data from said first and second sensors for distinguishing forward bending, backward bending, and lateral bending.