Method and device for the simultaneous analysis of ambulatorily recorded movements of an individual's different body parts

• US 5,851,193 A
• Filed: 02/11/1997
• Issued: 12/22/1998
• Est. Priority Date: 08/15/1994
• Status: Expired due to Term

• Current Assignee: Polar Electro Oy
• Original Assignee: Hannu Lauerma, Harri Arikka, Juha Markkula
• Inventors: Arikka, Harri, Markkula, Juha, Lauerma, Hannu
• Primary Examiner(s): HINDENBURG, MAX F
• Application Number:
  US08/776,930
• Time in Patent Office: 679 Days
• Field of Search: 600/587, 600/595, 73/862, 73/862.042
• US Class Current: 600/595
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: G01P 1/127 for acceleration values
• CPC Class Codes: G01P 13/00 Indicating or recording presence, absence, or direction, of movement electric switches H01H; counting moving objects G06M7/00

Abstract

A method and apparatus for the analysis of movements of several different parts of an individual'"'"'s body recorded by ambulatory measurement involves registering the movements by an accelerometer attached to each body part to be monitored and storing the signals in memory. The signals registered by the different accelerometers are retrieved from the memory and conducted synchronously to a detector to thereby enable simultaneous monitoring of the movements of the different body parts. Signals based on movements of the limbs, head and/or the middle body and, if desired, signals based on other functions of the body like eye movements, breathing or pulsation of the heart are conducted synchronously to the detector to allow simultaneous monitoring of the movements of the various body parts and other functions of the body. The result is a precise qualitative and quantitative characterization of an individual'"'"'s overall motor functions.

Claims

1. Method for analysis of movements of several different parts of an individual'"'"'s body recorded by ambulatory measurement comprising registering the movements of several different parts of an individual'"'"'s body by an accelerometer attached to each body part to be monitored, storing a signal from each accelerometer into memory, retrieving the signals registered by the accelerometers from the memory and synchronously conducting the signals retrieved from the memory to a detector thereby enabling simultaneous monitoring of the movements of the different body parts.

2. Method according to claim 1 wherein each accelerometer is an accelerometer comprising three orthogonal axes and including

separately storing each signal from movements along the three orthogonal axes, or

separately storing one signal and storing two signals as a sum signal of the two signals, or

storing three signals as a sum signal of the three signals.

3. Method according to claim 2 including storing each signal either into an analog memory or into a digital memory whose storage frequency is at least 0.1 Hz, preferably over 50 Hz.

4. Method according to claim 1, wherein the movements of several different parts of the body include movements of limbs, head and/or middle body, and including registering eye movements, breathing, or heart pulsation, and synchronously conducting signals indicative of eye movements, breathing or heart pulsation to the detector.

5. Method according to claim 1, wherein the signals are conducted to an analog detector.

6. Method according to claim 1, wherein the signals are conducted to a computer.

7. Apparatus for analysis of movements of several different parts of an individual'"'"'s body by ambulatory measurements, the apparatus comprising a plurality of accelerometers each adapted to be attached to a different part of a individual'"'"'s body for producing a signal indicative of movements of the different parts of the individual'"'"'s body, a detector into which the signals registered and stored by the accelerometer attached to each body part to be monitored is fed, and several channels for feeding the signals registered by different accelerometers to the detector to thereby allow simultaneous monitoring of several body parts.

8. Apparatus according to claim 7, including additional accelerometers for producing signals indicative of eye movements, breathing or heart pulsation and additional channels for feeding the signals from the additional accelerometers to the detector.

9. Apparatus according to claim 7, wherein the detector is an analog device.

10. Apparatus according to claim 7, wherein the detector is a computer.

11. Apparatus according to claim 7, including a memory for storing the signals from the accelerometers, said accelerometers each comprising three orthogonal axes and the memory being adapted to store

each signal separately from three movements along the three orthogonal axes, or

one signal separately and two signals as a sum signal of the two signals, or

three signals as a sum signal of the three signals.

12. Apparatus according to claim 11, wherein the memory is either an analog memory or a digital memory whose storing frequency is at least 0.1 Hz, preferably over 50 Hz.