CA2430535A1 - Body movement and respiration monitor - Google Patents

Body movement and respiration monitor Download PDF

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Publication number
CA2430535A1
CA2430535A1 CA002430535A CA2430535A CA2430535A1 CA 2430535 A1 CA2430535 A1 CA 2430535A1 CA 002430535 A CA002430535 A CA 002430535A CA 2430535 A CA2430535 A CA 2430535A CA 2430535 A1 CA2430535 A1 CA 2430535A1
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CA
Canada
Prior art keywords
moving amount
monitor
set forth
lighting pattern
inter
Prior art date
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Granted
Application number
CA002430535A
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French (fr)
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CA2430535C (en
Inventor
Masato Nakajima
Hirooki Aoki
Yasuhiro Takemura
Kazuhiro Mimura
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IDEAQUEST Inc
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Individual
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Publication of CA2430535A1 publication Critical patent/CA2430535A1/en
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Publication of CA2430535C publication Critical patent/CA2430535C/en
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Expired - Lifetime 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
    • A61B5/48—Other medical applications
    • A61B5/4806—Sleep evaluation
    • A61B5/4818—Sleep apnoea
    • 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
    • A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
    • A61B5/1135—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing by monitoring thoracic expansion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7253—Details of waveform analysis characterised by using transforms
    • A61B5/726—Details of waveform analysis characterised by using transforms using Wavelet transforms

Abstract

A monitor which can detect respiration of a sleeping person without being affected by the attitude of the sleeping person or the indoor illumination light and can easily evaluate detected respiration quantitatively through image measurement. The monitor comprises means (1) for projecting a specified illumination pattern, means (5) for picking up the image of projected light continuously, means (7) for calculating inter-frame moving amount of the illumination pattern from the image of two frames acquired by the image pickup means at different times, means (8) for generating a moving amount waveform data comprising inter-frame moving amounts arranged in time series, and means (9) for detecting the movement of an object from the moving amount waveform data.

Claims (23)

1. A monitor comprising:

lighting pattern projecting means for projecting a specified lighting pattern;

image pickup means for picking up light of a projected wavelength continuously;

moving amount calculating means for calculating an inter-frame moving amount of the lighting pattern from two frames of images acquired by the image pickup means at different times;

moving amount waveform generating means for generating moving amount waveform data comprising inter-frame moving amounts arranged in time series, and waveform detecting means for detecting a movement of an object to be picked up from the moving amount waveform data.
2. The monitor as set forth in Claim 1, wherein the waveform detecting means detects a body movement and respiration of a sleeping person, the monitor further comprising:

safety deciding means for deciding the safety of the sleeping person from the body movement and respiration of the sleeping person; and signal outputting means for, when the safety deciding means decides that the sleeping person is in a dangerous state, outputting a signal indicating it.
3. The monitor as set forth in Claim 2, wherein the moving amount calculating means calculates an inter-frame moving amount of a lighting pattern in an axial direction connecting the lighting pattern projecting means and the image pickup means.
4. The monitor as set forth in Claim 2 or 3, wherein the waveform detecting means detects a periodic pattern as a respiratory pattern, and detects a variation having a high peak as a body movement pattern from the moving amount waveform data.
5. The monitor as set forth in Claim 4, wherein the safety deciding means decides that the sleeping person is in a dangerous state when a period of the respiratory pattern falls into disarray in a short time, when the period of the respiratory pattern suddenly changes, when the respiratory pattern continuously disappears, or when the body movement pattern frequently appears in a short time.
6. The monitor as set forth in Claim 4 or 5, wherein the moving amount calculating means calculates an inter-frame moving amount of the lighting pattern in an axial direction connecting the lighting pattern projecting means and the image pickup means while providing a positive or negative sign in accordance with a moving direction.
7. The monitor as set forth in Claim 6, wherein from among respiratory patterns, the waveform detecting means detects a value having a positive or negative sign corresponding to a movement in a direction from the lighting pattern projecting means to the image pickup means on an image and a value having a positive or negative sign corresponding to a movement in a direction from the image pickup means to the lighting pattern projecting means on the image as an expiratory pattern and as an inspiratory pattern, respectively, or vice versa.
8. The monitor as set forth in Claim 7, wherein the waveform detecting means counts zero crosses where signs are reversed between an expiratory pattern and an inspiratory pattern and counts respirations.
9. The monitor as set forth in Claim 8, wherein the waveform detecting means calculates a respiration number per unit time or a respiration period from the counted respirations.
10. The monitor as set forth in Claim 1 or 7, wherein the waveform detecting means calculates a respiration number per unit time or a respiration period by conducting a frequency analysis of the moving-amount waveform data set forth in Claim 1 or the sampling data obtained by sampling respiratory patterns set forth in Claim 7, by calculating the most prominent frequency from a resulting frequency spectrum, and by calculating the respiration number per unit time or the respiration period from this frequency.
11. The monitor as set forth in Claim 10, wherein the wave form detecting means conducts a frequency analysis with discrete Fourier transform or discrete wavelet transform.
12. The monitor as set forth in any one of Claims 7 through 9, wherein the safety deciding means decides whether respiration belongs to normal respiration, Cheyne-Stokes respiration, central hyperventilation, ataxic respiration, or Kussmaul respiration from expiratory patterns and inspiratory patterns and decides that the sleeping person is in a dangerous state when the respiration belongs to any one of Cheyne-Stokes respiration, central hyperventilation, ataxic respiration, and Kussmaul respiration.
13. The monitor as set forth in Claim 2, wherein the moving amount calculating means calculates an inter-frame moving amount in a partial region of the lighting pattern in an axial direction connecting the lighting pattern projecting means and the image pickup means, and determines a region in an image where an inter-frame moving amount in the partial region appears much greater than a predetermined amount or where an inter-frame movement in the partial region appears frequently beyond a predetermined amount as a region where the sleeping person exists, and the safety deciding means decides that the sleeping person is in a dangerous state when the region where the sleeping person exists moves in a shorter time than a predetermined time and moves frequently beyond a predetermined amount.
14. The monitor as set forth in Claim 2, wherein the moving amount calculating means calculates an inter-frame moving amount in a partial region of the lighting pattern in an axial direction connecting the lighting pattern projecting means and the image pickup means, and determines a region in an image where an inter-frame moving amount in the partial region appears much greater than a predetermined amount or where an inter-frame movement in the partial region appears more frequently than a predetermined frequency as a region where the sleeping person exists, and the safety deciding means decides that the sleeping person is in a dangerous state when the region where the sleeping person exists is brought closer to one end of the bed than a predetermined distance.
15. The monitor as set forth in any one of Claims 2 through 14, comprising informing means for, based on a signal output from signal outputting means, informing a third party that the sleeping person is in a dangerous state.
16. The monitor as set forth in Claim 15, wherein the informing means informs the third party that the sleeping person is in a dangerous state by voices, characters, symbols, intensity of light including interior illumination light, or vibrations through a telecommunications line.
17. The monitor as set forth in any one of Claims 1 through 16, wherein the lighting pattern projecting means projects a lighting pattern that has a plurality of lighting spots, and the moving amount calculating means calculates an inter-frame moving amount of each lighting spot in an axial direction connecting the lighting pattern projecting means and the image pickup means while providing a positive or negative sign in accordance with a moving direction, and calculates an inter-frame moving amount of the lighting pattern by use of a moving amount of one or more of the lighting spots.
18. The monitor as set forth in any one of Claims 1 through 16, wherein the lighting pattern projecting means projects a lighting pattern that has a plurality of lighting spots, and the moving amount calculating means calculates an inter-frame moving amount of each lighting spot in an axial direction connecting the lighting pattern projecting means and the image pickup means while providing a positive or negative sign in accordance with a moving direction, and calculates the total moving amount of each lighting spot as an inter-frame moving amount of the lighting pattern.
19. The monitor as set forth in any one of Claims 1 through 16, wherein the lighting pattern projecting means projects a lighting pattern that has a single slit ray or a plurality of slit rays, and the moving amount calculating means calculates an inter-frame moving amount of each lighting spot in an axial direction connecting the lighting pattern projecting means and the image pickup means while providing a positive or negative sign in accordance with a moving direction, and calculates an inter-frame moving amount of the lighting pattern by use of a moving amount of a pixel corresponding to the single or plural slit rays.
20. The monitor as set forth in any one of Claims 1 through 16, wherein the lighting pattern projecting means projects a lighting pattern that has a single slit ray or a plurality of slit rays, and the moving amount calculating means calculates an inter-frame moving amount of each pixel corresponding to a slit ray in an axial direction connecting the lighting pattern projecting means and the image pickup means while providing a positive or negative sign in accordance with a moving direction, and calculates the total moving amount of each pixel corresponding to the slit ray as an inter-frame moving amount of the lighting pattern.
21. The monitor as set forth in any one of Claims 1 through 20, wherein the lighting pattern projecting means is disposed directly above a part close to one end of an edge of bedding facing a head or a foot of a person sleeping on the bedding, and the image pickup means is disposed directly above a part close to an opposite end thereof.
22. The monitor as set forth in any one of Claims 1 through 21, comprising presence-in-bed detecting means for detecting the presence/absence of a sleeping person.
23. The monitor as set forth in any one of Claims 1 through 22, comprising a pressure sensitive switch that can be placed under the sleeping person and can be used to detect the presence/absence of the sleeping person.
CA2430535A 2000-12-07 2001-12-06 Body movement and respiration monitor Expired - Lifetime CA2430535C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000-372820 2000-12-07
JP2000372820A JP3477166B2 (en) 2000-12-07 2000-12-07 Monitoring device
PCT/JP2001/010685 WO2002045585A1 (en) 2000-12-07 2001-12-06 Monitor

Publications (2)

Publication Number Publication Date
CA2430535A1 true CA2430535A1 (en) 2002-06-13
CA2430535C CA2430535C (en) 2012-09-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2430535A Expired - Lifetime CA2430535C (en) 2000-12-07 2001-12-06 Body movement and respiration monitor

Country Status (6)

Country Link
US (1) US7431700B2 (en)
EP (1) EP1350466B1 (en)
JP (1) JP3477166B2 (en)
AT (1) ATE524109T1 (en)
CA (1) CA2430535C (en)
WO (1) WO2002045585A1 (en)

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EP1350466B1 (en) 2011-09-14
CA2430535C (en) 2012-09-11
JP3477166B2 (en) 2003-12-10
US20040082874A1 (en) 2004-04-29
JP2002175582A (en) 2002-06-21
US7431700B2 (en) 2008-10-07
WO2002045585A1 (en) 2002-06-13

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