Device and method for predicting a loss of control over a muscle

• US 8,821,414 B2
• Filed: 06/16/2008
• Issued: 09/02/2014
• Est. Priority Date: 07/11/2007
• Status: Expired due to Fees

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V., Friedrich-Alexander-Universitat Erlangen-Nurnberg
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V., Friedrich-Alexander-Universitat Erlangen-Nurnberg
• Inventors: Moersdorf, Hans-Joachim, Aschenbrenner, Stefan, Thielecke, Joern, Schmitt, Hubert
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): Foreman, Jonathan M
• Application Number:
  US12/668,016
• Publication Number:
  US 20100286572A1
• Time in Patent Office: 2,269 Days
• Field of Search: 600/595, 600/594, 600/587, 600/534, 600/528, 600/527, 600/431, 600/586
• US Class Current: 600/586
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/1117 Fall detection
• CPC Class Codes: A61B 5/4519 Muscles A61B5/389, A61B5/224 take precedence
• CPC Class Codes: A61B 7/006 Detecting skeletal, cartilage or muscle noise A61B7/003 and A61B7/008 take precedence

Abstract

A device for predicting a loss of control over a muscle of a human being has a detector for detecting a sound of the muscle, an acquirer for acquiring an acceleration of the human being and an evaluator for evaluating the sound and the acceleration to determine an imminent loss of control over the muscle from the sound and the acceleration.

Claims

1. A device for predicting a loss of control over a muscle of a human being, comprising:

a detector for detecting a muscle sound;

an acquirer for acquiring an acceleration of the human being; and

an evaluator for evaluating the muscle sound and the acceleration and determine an imminent loss of control over the muscle from the muscle sound and the acceleration.

2. The device in accordance with claim 1, wherein the detector for detecting is implemented to detect the muscle sound of a supportive muscle or a leg muscle, and wherein the evaluator for evaluating is implemented to determine an imminent loss of control of the supportive muscle or the leg muscle.

3. The device in accordance with claim 1, wherein the evaluator for evaluating is implemented to output, in the case of determining an imminent loss of control over the muscle, a warning signal detectable by the human being.

4. The device in accordance with claim 3, wherein the warning signal comprises a photo signal and/or an acoustic signal and/or a tangible stimulus.

5. The device in accordance with claim 3, wherein the evaluator for evaluating is implemented to transfer the warning signal to a predetermined notification institution.

6. The device in accordance with claim 1, wherein the evaluator for evaluating is implemented to acquire the muscle sound and the acceleration at a sequence of time instances and combine same to form a data set.

7. The device in accordance with claim 6, wherein the evaluator for evaluating is implemented to compare the data set to a model data set and to determine a percentage matching value to draw conclusions about a current movement of the human being, the model data set corresponding to a data set which may be generated by a certain movement of the human being.

8. The device in accordance with claim 7, wherein the model data set comprises a parameter, and wherein the evaluator for evaluating is implemented to vary the parameter in order to maximize a percentage matching value.

9. The device in accordance with claim 1, wherein the evaluator for evaluating is implemented to store data of the detector and/or data of the acquirer.

10. The device in accordance with claim 1, wherein the evaluator for evaluating comprises a transferrer and the transferrer is implemented to acquire data from the detector and/or data from the acquirer and transfer same to a central unit.

11. The device in accordance with claim 10, wherein the transferrer acquires data in a wireless manner or transfers data in a wireless manner.

12. The device in accordance with claim 1, wherein the detector for detecting and the acquirer for acquiring and the evaluator for evaluating are housed together in a combined sensor.

13. The device in accordance with claim 12, wherein the combined sensor comprises an attacher for attaching to a thigh or leg of the human being.

14. The device in accordance with claim 1, wherein the detector for detecting comprises an attacher for attaching to a thigh and the acquirer for acquiring an acceleration comprises an attacher for attaching to a hip area of the human being.

15. The device in accordance with claim 1, further comprising a further acquirer for acquiring cardiac muscle sounds, wherein the further acquirer may be attached close to the heart of the human being and the evaluator for evaluating is implemented to perform determining the loss of control also from the cardiac muscle sounds.

16. The device in accordance with claim 1, wherein the detector for detecting and the acquirer for acquiring or the combined sensor comprise an attacher for attaching to a head-neck area to determine head nodding resulting from over-tiredness of the human being.

17. The device in accordance with claim 1, wherein the detector for detecting and/or the acquirer for acquiring comprise a wireless transmitter, the wireless transmitter being implemented to transmit sensor data to the evaluator for evaluating.

18. The device in accordance with claim 1, wherein the evaluator allows transmitting data by means of Bluetooth.

19. The device in accordance with claim 1, further comprising a further detector for detecting environmental sounds originating outside the human being, and wherein the evaluator for evaluating is implemented to receive data from the further detector and to form a sound difference between the muscle sounds and the environmental sounds.

20. The device in accordance with claim 1, wherein the acquirer for acquiring an acceleration is implemented to determine a timeline of the position of a torso of the human being relative to the gravitational field.

21. The device in accordance with claim 1, wherein the evaluator for evaluating is implemented to receive data of the detector at a sequence of time instances, and is further implemented to additionally receive, when reaching a sound threshold value, data from the acquirer for acquiring an acceleration in order to generate a warning signal when an acceleration threshold value is exceeded.

22. The device in accordance with claim 1, wherein the evaluator is implemented to

continuously survey the muscle sound to identify an occurrence of irregularities in the muscle sound indicating the immanent loss of control over the muscle, and

interrogate the acquirer responsive to the identification of the occurrence of irregularities in the muscle sound and check as to whether the acceleration of the human being shows particularities relating to the immanent loss of control over the muscle within a predetermined time interval after the occurrence of irregularities in the muscle sound, and

disregard the occurrence of irregularities in the muscle sound in case of the acceleration of the human being showing no particularities relating to the immanent loss of control over the muscle within the predetermined time interval, and output, in the case of the acceleration of the human being showing the particularities relating to the immanent loss of control over the muscle within the predetermined time interval, a warning signal detectable by the human being.

23. The device in accordance with claim 1, wherein the evaluator is implemented to sample the muscle sound and the acceleration at a sequence of time instances and combine, for each time instance, the muscle sound and the acceleration sampled at the respective time instance to form a data set so as to obtain a sequence of data sets, the evaluator comprising

a plurality of model units associated with different types of activities of the human being, each model unit being configured to subject the sequence of data sets to a prediction using a prediction model associated with the type of activity associated with the respective model unit;

a plurality of comparators, each comparator being associated with a different one of the plurality of model units and configured to compare the prediction of the associated model unit with the sequence of data units so as to obtain a percentage value for the associated model unit; and

a model selector configured to select among the model units one for which the percentage value is maximum,

wherein the different types of activities comprise at least one type of activity related to the imminent loss of control over the muscle.

24. The device in accordance with claim 23, wherein each of at least a subset of the plurality of model units are configured such that the prediction model associated with the type of activity associated with the respective model unit is parametrizable via a model parameter and the model parameter is adjusted using the percentage value for the respective model unit as a feedback.

25. The device in accordance with claim 1, wherein the evaluator is implemented to sample the muscle sound and the acceleration at a sequence of time instances and combine, for each time instance, the muscle sound and the acceleration sampled at the respective time instance to form a data set so as to obtain a sequence of data sets, the evaluator comprising

a plurality of mode test units associated with different types of activities of the human being, each model test unit being configured to match temporal sub-sequences of the data sets out of the sequence of data sets with a pattern associated with the type of activity associated with the respective model unit to obtain a matching value for the respective model unit;

a model selector configured to select among the model test units one for which the matching value is maximum,

wherein the different types of activities comprise at least one type of activity related to the imminent loss of control over the muscle.

26. The device in accordance with claim 25, wherein each of at least a subset of the plurality of model units are configured such that the pattern associated with the type of activity associated with the respective model test unit is parametrizable via a model parameter and configured to continuously adjust the model parameter so as to maximize the matching value obtained by the respective model test unit.