GB2525903A - A device for determining unconciousness of a subject and a device for detecting a fall by a subject - Google Patents

A device for determining unconciousness of a subject and a device for detecting a fall by a subject Download PDF

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Publication number
GB2525903A
GB2525903A GB1408120.2A GB201408120A GB2525903A GB 2525903 A GB2525903 A GB 2525903A GB 201408120 A GB201408120 A GB 201408120A GB 2525903 A GB2525903 A GB 2525903A
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GB
United Kingdom
Prior art keywords
alert message
subject
motion sensor
processor
fall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1408120.2A
Other versions
GB201408120D0 (en
Inventor
Stephen William Bradbury
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MONITORGO Ltd
Original Assignee
MONITORGO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MONITORGO Ltd filed Critical MONITORGO Ltd
Priority to GB1408120.2A priority Critical patent/GB2525903A/en
Publication of GB201408120D0 publication Critical patent/GB201408120D0/en
Publication of GB2525903A publication Critical patent/GB2525903A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1116—Determining posture transitions
    • A61B5/1117—Fall detection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/746—Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
    • G08B21/0407—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons based on behaviour analysis
    • G08B21/0415—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons based on behaviour analysis detecting absence of activity per se
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
    • G08B21/0407—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons based on behaviour analysis
    • G08B21/043—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons based on behaviour analysis detecting an emergency event, e.g. a fall
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A61B5/0015—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by features of the telemetry system
    • A61B5/0022—Monitoring a patient using a global network, e.g. telephone networks, internet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1112—Global tracking of patients, e.g. by using GPS
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1118—Determining activity level
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A61B5/6898—Portable consumer electronic devices, e.g. music players, telephones, tablet computers

Abstract

A device (e.g. mobile phone, tablet) for detecting unconsciousness of a subject comprises a motion sensor 2 (e.g. accelerometer), a wireless transmitter 4 for sending a message and a processor 3 connected to the motion sensor and the wireless transmitter. The processor measures the output of the motion sensor at periodic intervals to determine if the motion sensor is moving and an alert message is sent via the wireless transmitter if movement above a threshold level is not detected in a predetermined period of time. Alternatively, or additionally, the output of the motion sensor can be used to determine if a fall has occurred, for example by determining if the speed of the device suddenly changes due to impact with the ground. The alert message may include GPS coordinates of the device, obtained by a GPS system 7. An override function may be provided so that the subject can cancel the alert message prior to transmission.

Description

A device for determining unconsciousness of a subject and a device for detecting a fall by a subject.
The present invention relates to a device for detecting unconsciousness of a subject. More particularly, but not exclusively, the present invention relates to a device for detecting unconsciousness in a subject which measures the motion of the subject at periodic intervals and sends an alert message if no motion is detected in a predetermined time frame. The present invention also relates to a device for detecting a fall by a subject. More particularly, but not exclusively, the present invention relates to a device for detecting the fall of a subject which measures the output of a motion senor at periodic intervals and sends an alert message if a fall is detected.
Some people, particularly the very elderly, are at risk of becoming unconscious, often without warning. This can happen when they are unattended. Even if they are being monitored by a carer it can be difficult for the carer to distinguish between unconsciousness and sleep. Similarly, the elderly or infirm are also at risk of falling which again can happen while they are unattended. In this case the person will have to wait until they are discovered before they can receive assistance.
The present invention seeks to overcome the problems of the prior art.
Accordingly, in a first aspect, the present invention provides a device for detecting unconsciousness of a subject, the device comprising a motion sensor; a wireless transmitter for sending a message; and, a processor connected to the motion sensor and the wireless transmitter; the processor being adapted to measure the output of the motion sensor at periodic intervals to determine if the motion sensor is moving and to send an alert message via the wireless transmitter if movement above a threshold level is not detected in a predetermined period of time.
The device according to the invention automatically detects that the patient is unconscious and sends an alert to a third party. The third party can then provide the required assistance.
Preferably the device is a mobile phone or tablet. The subject will often already be carrying such a device in a pocket.
Preferably, the device further comprises a GPS system and the alert message includes the GPS co-ordinates of the device. This has the advantage that when the third party receives the alert message they are able to provide assistance to the correct location.
Preferably, the device is adapted to display an override notification to the subject prior to transmitting the alert message, the processor being adapted to cancel the alert message before transmission on receiving a response to the override message.
In a further aspect of the invention there is provided a method of detecting unconsciousness of a subject comprising the steps of (a) measuring the output of a motion sensor at periodic intervals, the motion sensor being in contact with the subject; (b) determining if the subject is moving from the output of the motion sensor; and, (c) sending an alert message to a third party if movement is not detected after a predetermined period of time.
Preferably the alert message includes the GPS co-ordinates of the device.
Preferably the method further comprises the steps of (a) displaying an override notification to the subject prior to sending the alert message; and, (b) cancelling the alert message prior to sending if a response is received to the override notification.
In a further aspect of the invention there is provided a device for detecting a fall by a subject, the device comprising a motion sensor; a wireless transmitter for sending a message; and, a processor connected to the motion sensor and the wireless transmitter; the processor being adapted to measure the output of the motion sensor at periodic intervals to determine if a fall has occurred and if so to send an alert message via the wireless transmitter.
Preferably the device is a mobile phone or tablet.
Preferably the device further comprises a GPS system and the alert message includes the GPS co-ordinates of the device.
Preferably the processor detects a fall by determining if there has been a decrease in speed of the device greater than a sensitivity limit within a predetermined time frame.
Alternatively, the processor detects a fall by determining if the average gravity experienced by the device over a predetermined time frame is less than a sensitivity limit.
Preferably the device is adapted to display an override notification to the subject prior to transmitting the alert message, the processor being adapted to cancel the alert message on receiving a response to the override notification.
Preferably the processor adjusts the sensitivity limit in addition to cancelling the alert message.
The present invention will now be described by way of example only and not in any limitative sense with reference to the accompanying drawings in which, Figures 1(a) and 1(b) show embodiments of a device according to the invention; Figure 2 shows the output from the motion sensor of a device according to the invention as a function of time; and, FigureS is a flow chart showing the operation of a device according to the invention.
Shown in figure 1 is a device 1 according to the invention. The device 1 comprises at least one motion sensor 2 (typically an accelerometer). Connected to the accelerometer 2 is a processor 3.
Further connected to the processor 3 is a wireless transmitter 4. This combination of structural elements is often found in modern mobile phones and a mobile phone is an example of a device 1 according to the invention. For the avoidance of doubt the device 1 according to the invention is not limited to mobile phones.
In use the device 1 is placed in contact with the subject. The device 1 may be placed on the chest of the subject. Alternatively the device 1 may be in the pocket of a subject such as a trouser pocket or jacket pocket. In a further alternative the device 1 may be indirectly in contact with the subject, for example alongside the subject on a bed or in a chair. The device 1 is sufficiently in contact with the subject if motion of the subject is transmitted to the device 1 where it can be measured.
In use the motion sensor 2 measures the motion of the subject. The processor 3 measures the output of the motion sensor 2 at periodic intervals, typically several times a second. An example of the data measured by the processor 3is shown in figure 2. In this case the device 1 is in contact with a sleeping subject. The small regular motion 5 detected is the heartbeat and breathing of the subject. Superimposed on this however are large spikes 6 in movement. Even during the deep stages of sleep a subject will typically move three to four times an hour (and more so during the lighter stages of sleep). Such movements, whilst they are represented as large spikes in the data are often quite small and hardly noticeable to an observer.
The processor 3 records the output from the motion sensor 2. The processor 3 may simply record all data until it runs out of memory when the oldest data is then overwritten. Alternatively, the processor 3 may record data in a rolling time window of typically thirty minutes to an hour in length.
As a new data point is collected and inserted at one end of the window the oldest data point is removed from the other end of the window.
The processor 3 constantly reviews the data in the time window. If no motion above a predetermined threshold level is detected in the time window then the processor 3 generates an alert message. The alert message is passed to the wireless transmitter 4. This is then sent to a third party. The message may be an SMS message. Alternatively it may be a voice message. It could also be an e-mail. Typically the message is sent to a call centre or to one or more relatives of the subject.
On receipt of the message the call centre or relative may call the subject to see if assistance is required. If so, or if no response is received then assistance is dispatched.
In an alternative embodiment of the invention shown in figure 1(b) the device 1 further comprises a GPS system 7. The alert message includes the GPS co-ordinates of the device 1 and enables the receiver of the alert signal to dispatch assistance more efficiently.
In a further aspect of the invention the device 1 displays an override notification to the user prior to sending the alert message. If the user responds to the override notification (typically by pressing an icon on the screen of the phone) before the end of a countdown period the processor 3 cancels the alert message and it is not sent. The response to the override notification is counted as motion above the threshold level for future determination of subject movement.
In a further aspect of the invention the processor 3 will not check for movement of the device 1 whilst the device 1 is being charged as it is unlikely that the device 1 is being carried by the subject at that time.
In an alternative embodiment of the invention the device 1 is used to determine a fall by a subject.
Again the processor 3 measures the output of the motion sensor 2 at periodic intervals. Typically this is more frequent than when the device 1 is being used to determine if the subject is unconscious.
The processor 3 determines if the speed of the device 1 suddenly changes corresponding to impact with the ground at the bottom of a fall. More particularly the processor 3 determines from the output of the motion sensor 2 if there has been a decrease in the speed of the device 1 greater than a sensitivity limit within a predetermined time frame. If so the device 1 sends the alert message via the wireless transmitter 4 to a third party. If the device 1 includes a GE'S system 7 the GE'S co-ordinates of the device 1 are included in the alert message.
The device 1 may provide an override notification to the subject before sending the alert message. If the subject responds to the override notification then the alert message is not sent. In this case the processor 3 may increase the sensitivity limit when cancelling the alert message to reduce the number of false alerts in the future.
Often a fall is not a sudden event, rather it is a gradual collapse towards the ground which may take several seconds. In order to detect such a fall the processor 3 determines the average gravity experienced by the device 1 over a predetermined time frame. Again, the device 1 typically stores the output data from the motion sensor 2 as a rolling window and recalculates the average gravity each time the data in the window changes. If the average gravity measured over the data in the window is less than a sensitivity limit the device 1 sends the alert message. Again, a subject can prevent the alert message from being sent by responding to an override notification within a countdown period. The processor 3 may again adjust the sensitivity limit when cancelling the alert message to reduce the number of false alert messages from being sent.
Preferably the subject can activate the device 1 manually to send an alert message. The device 1 can also be activated remotely to send an alert message. This is particularly useful if the subject has developed early stage Alzheimer's disease. The subject may be able to adjust the sensitivity level manually. Alternatively or additionally it can be set remotely.
The device 1 may perform the methods simultaneously. The same device 1 may perform both methods of determining a fall by the user and determining if the user is unconscious by analysis of the same data set.
Shown in figure 3 is a flow chart demonstrating the operation of a device 1 according to the invention. a

Claims (17)

  1. CLAIMS1. A device for detecting unconsciousness of a subject, the device comprising a motion sensor; a wireless transmitter for sending a message; and, a processor connected to the motion sensor and the wireless transmitter; the processor being adapted to measure the output of the motion sensor at periodic intervals to determine if the motion sensor is moving and to send an alert message via the wireless transmitter if movement above a threshold level is not detected in a predetermined period of time.
  2. 2. A device as claimed in claim 1, wherein the device is a mobile phone or tablet.
  3. 3. A device as claimed in either of claims 1 or 2, wherein the device further comprises a GPS system and the alert message includes the GPS co-ordinates of the device.
  4. 4. A device as claimed in any one of claims 1 to 3, wherein the device is adapted to display an override notification to the subject prior to transmitting the alert message, the processor being adapted to cancel the alert message before transmission on receiving a response to the override message.
  5. S. A method of detecting unconsciousness of a subject comprising the steps of (a) measuring the output of a motion sensor at periodic intervals, the motion sensor being in contact with the subject; (b) determining if the subject is moving from the output of the motion sensor; and, (c) sending an alert message to a third party if movement is not detected after a predetermined period of time.
  6. 6. A method as claimed in claim 5, wherein the alert message includes the GPS co-ordinates of the device.
  7. 7. A method as claimed in either of claims 5 or 6 further comprising the steps of (a) displaying an override notification to the subject prior to sending the alert message; and, (b) cancelling the alert message prior to sending if a response is received to the override notification.
  8. 8. A device for detecting a fall by a subject, the device comprising a motion sensor; a wireless transmitter for sending a message; and, a processor connected to the motion sensor and the wireless transmitter; the processor being adapted to measure the output of the motion sensor at periodic intervals to determine if a fall has occurred and if so to send an alert message via the wireless transmitter.
  9. 9. A device as claimed in claim 8, wherein the device is a mobile phone or tablet.
  10. 10. A device as claimed in either of claims 8 or 9, wherein the device further comprises a GPS system and the alert message includes the GPS co-ordinates of the device.
  11. 11. A device as claimed in any one of claims 8 to 10, wherein the processor detects a fall by determining if there has been a decrease in speed of the device greater than a sensitivity limit within a predetermined time frame.
  12. 12. A device as claimed in any one of claims 8 to 11, wherein the processor detects a fall by determining if the average gravity experienced by the device over a predetermined time frame is less than a sensitivity limit.
  13. 13. A device as claimed in any one of claims 8 to 12, wherein the device is adapted to display an override notification to the subject prior to transmitting the alert message) the processor being adapted to cancel the alert message on receiving a response to the override notification.
  14. 14. A device as claimed in claim 13, when dependent on either of claims 11 or 12, wherein the processor adjusts the sensitivity limit in addition to cancelling the alert message.
  15. 15. A method for detecting a fall by a subject comprising the steps of (a) measuring the output of a motion sensor in contact with the subject at periodic intervals; (b) determining if a fall has occurred from the output of the motion sensor; and, (c) sending an alert message if a fall has occurred.
  16. 16. A device substantially as hereinbefore described.
  17. 17. A method substantially as hereinbefore described.
GB1408120.2A 2014-05-08 2014-05-08 A device for determining unconciousness of a subject and a device for detecting a fall by a subject Withdrawn GB2525903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1408120.2A GB2525903A (en) 2014-05-08 2014-05-08 A device for determining unconciousness of a subject and a device for detecting a fall by a subject

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408120.2A GB2525903A (en) 2014-05-08 2014-05-08 A device for determining unconciousness of a subject and a device for detecting a fall by a subject

Publications (2)

Publication Number Publication Date
GB201408120D0 GB201408120D0 (en) 2014-06-25
GB2525903A true GB2525903A (en) 2015-11-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107633655A (en) * 2017-09-26 2018-01-26 深圳市金立通信设备有限公司 A kind of fall detection method, terminal and computer-readable recording medium
GB2573835A (en) * 2018-09-05 2019-11-20 Redmond Group Ltd Communicator
GB2602668A (en) * 2021-01-12 2022-07-13 Kraydel Ltd Monitoring system

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WO2005025418A1 (en) * 2003-09-15 2005-03-24 Nanyang Polytechnic A method and system for monitoring and locating an inactive individual
US20080129518A1 (en) * 2006-12-05 2008-06-05 John Carlton-Foss Method and system for fall detection
KR100849107B1 (en) * 2007-08-23 2008-07-30 김순례 A mountain-wear for preventing accident
US20090040052A1 (en) * 2007-08-06 2009-02-12 Jeffry Michael Cameron Assistance alert method and device
US20090121863A1 (en) * 2007-11-13 2009-05-14 Rich Prior Medical safety monitor system
US20090322540A1 (en) * 2008-06-27 2009-12-31 Richardson Neal T Autonomous fall monitor
GB2464507A (en) * 2008-10-17 2010-04-21 Advanced It Systems Ltd Remote monitor raises alarm if a reply to a message is not received from a monitored object in time
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US20110025493A1 (en) * 2005-03-11 2011-02-03 Aframe Digital, Inc. Mobile wireless customizable health and condition monitor
EP2482264A2 (en) * 2011-01-27 2012-08-01 Honeywell International, Inc. Systems and methods for robust man-down alarms
GB2506442A (en) * 2012-10-01 2014-04-02 Tunstall Group Ltd Providing an inactivity alarm when a number of detected non-fall events are below a threshold value within a predetermined time period
WO2014138773A1 (en) * 2013-03-15 2014-09-18 South East Water Corporation Safety monitor application

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030153836A1 (en) * 2000-05-05 2003-08-14 Claude Gagnadre Device and method for detecting abnormal situations
WO2005025418A1 (en) * 2003-09-15 2005-03-24 Nanyang Polytechnic A method and system for monitoring and locating an inactive individual
US20110025493A1 (en) * 2005-03-11 2011-02-03 Aframe Digital, Inc. Mobile wireless customizable health and condition monitor
US20080129518A1 (en) * 2006-12-05 2008-06-05 John Carlton-Foss Method and system for fall detection
US20090040052A1 (en) * 2007-08-06 2009-02-12 Jeffry Michael Cameron Assistance alert method and device
KR100849107B1 (en) * 2007-08-23 2008-07-30 김순례 A mountain-wear for preventing accident
US20090121863A1 (en) * 2007-11-13 2009-05-14 Rich Prior Medical safety monitor system
US20090322540A1 (en) * 2008-06-27 2009-12-31 Richardson Neal T Autonomous fall monitor
GB2464507A (en) * 2008-10-17 2010-04-21 Advanced It Systems Ltd Remote monitor raises alarm if a reply to a message is not received from a monitored object in time
US20100285771A1 (en) * 2009-05-11 2010-11-11 Peabody Steven R System containing location-based personal emergency response device
EP2482264A2 (en) * 2011-01-27 2012-08-01 Honeywell International, Inc. Systems and methods for robust man-down alarms
GB2506442A (en) * 2012-10-01 2014-04-02 Tunstall Group Ltd Providing an inactivity alarm when a number of detected non-fall events are below a threshold value within a predetermined time period
WO2014138773A1 (en) * 2013-03-15 2014-09-18 South East Water Corporation Safety monitor application

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107633655A (en) * 2017-09-26 2018-01-26 深圳市金立通信设备有限公司 A kind of fall detection method, terminal and computer-readable recording medium
GB2573835A (en) * 2018-09-05 2019-11-20 Redmond Group Ltd Communicator
WO2020049306A1 (en) * 2018-09-05 2020-03-12 Redmond Group Ltd Communicator
GB2573835B (en) * 2018-09-05 2020-05-13 Redmond Group Ltd Communicator
GB2602668A (en) * 2021-01-12 2022-07-13 Kraydel Ltd Monitoring system

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