# US 2019/0167202 A1 · Respiration waveform drawing system and biological information monitoring system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167202 A1 - Document ID: US20190167202A1 - Status: Published application - Kind: A1 - Application number: 16/191,922 - Filed: 2018-11-15 - Published: 2019-06-06 - Earliest claimed: 2016-05-17 - Assignees: MINEBEA MITSUMI Inc. - Applicants: Minebea Mitsumi Inc. - Inventors: Hiroyuki AKATSU; Norihito IIDA - Web page: https://patentgrep.com/patent/US20190167202A1 ## CPC - A61B 5/7235: {Details of waveform analysis (detecting specific parameters of the electrocardiograph cycle A61B5/349)} - A61B 5/00: Measuring for diagnostic purposes (radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00); Identification of persons - A61B 5/08: Measuring devices for evaluating the respiratory organs - A61B 5/0816: {Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00)} - A61B 5/1102: {Ballistocardiography} - A61B 5/1115: {Monitoring leaving of a patient support, e.g. a bed or a wheelchair} - A61B 5/113: occurring during breathing - A61B 5/6892: {Mats} - A61B 5/7207: {of noise induced by motion artifacts} - A61G 7/05: Parts, details or accessories of beds (devices for prevention against falling out A47C21/08, A47D7/00 {; mattresses A47C27/00}) - A61B 5/0803: {Recording apparatus specially adapted therefor} - A61B 5/1121: {Determining geometric values, e.g. centre of rotation or angular range of movement} - A61B 5/6891: {Furniture} - A61B 2562/0252: Load cells - A61B 2562/046: in a matrix array - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61G: TRANSPORT, PERSONAL CONVEYANCES OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS (appliances for aiding patients or disabled persons to walk A61H3/00); OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES (embalming corpses A01N1/00) ## Abstract There is provided a respiratory waveform drawing system. The system includes: load detectors configured to detect loads of the subjects and output them as a load signal; a subject number determination unit configured to determine a number of the subjects on the bed based on a frequency spectrum of the load signal; a waveform separation unit configured to separate a load component of each of the subjects from the load signal outputted from each of the plurality of load detectors; a center of gravity position calculation unit configured to calculate a position of a center of gravity of each of the subjects based on the separated load component of each of the subjects; and a waveform drawing unit configured to draw a respiratory waveform of each of the subjects based on a temporal variation of the position of the center of gravity of each of the subjects. ## Claims ### Claim 1 A respiratory waveform drawing system for drawing respiratory waveforms of subjects on a bed, the system comprising: a plurality of load detectors which are to be placed in the bed or under legs of the bed, and each of which is configured to detect loads of the subjects and output the detected loads of the subjects as a load signal; a subject number determination unit configured to determine a number of the subjects on the bed based on a frequency spectrum of the load signal; a waveform separation unit configured to separate a load component of each of the subjects from the load signal outputted from each of the plurality of load detectors, in a case that the number of the subjects on the bed is determined to be more than one; a center of gravity position calculation unit configured to calculate a position of a center of gravity of each of the subjects based on the separated load component of each of the subjects; and a waveform drawing unit configured to draw a respiratory waveform of each of the subjects based on a temporal variation of the position of the center of gravity of each of the subjects. ### Claim 2 (depends on 1) A respiratory waveform drawing system according to claim 1, wherein the subject number determination unit determines that a number of peak frequencies appeared in the frequency spectrum of the load signal is the number of the subjects on the bed. ### Claim 3 (depends on 1) A respiratory waveform drawing system according to claim 1, further comprising an oscillation coordinate setting unit configured to set an oscillation origin and an oscillation axis of the respiratory waveform of each of the subjects, the oscillation coordinate setting unit being configured to perform for each of the subjects: obtaining a first extreme point at which a distance between an initial origin and the position of the center of gravity shifting from the initial origin is maximized, the position of the center of gravity at a certain time point being used as the initial origin; obtaining a second extreme point which appears at an opposite side of the initial origin from the first extreme point, and at which a distance between the initial origin and the position of the center of gravity shifting from the first extreme point is maximized; setting a direction connecting the first and second extreme points as a direction of a tentative oscillation axis; and setting a midpoint between the first and second extreme points as a tentative oscillation origin, wherein the waveform drawing unit is configured to draw the respiratory waveform of each of the subjects by presenting a displacement, from the tentative oscillation origin, of a position obtained by projecting the position of the center of gravity onto the tentative oscillation axis, with respect to time. ### Claim 4 (depends on 1) A respiratory waveform drawing system according to a claim 1, further comprising a drawing compensation unit configured to compensate a drawing state of the respiratory waveform of each of the subjects, wherein the drawing compensation unit comprises: a predictive waveform generation unit configured to generate a predictive waveform for each of the subjects based on the respiratory waveform in a past; and a correction distance calculation unit configured to calculate, for each of the subjects, a distance between the respiratory waveform and the predictive waveform at a predetermined sampling time point, the drawing compensation unit being configured to compensate the drawing state of the respiratory waveform of each of the subjects depending on the distance. ### Claim 5 biological information monitoring system for monitoring a biological information of subjects on a bed, the system comprising: a plurality of load detectors which are to be placed in the bed or under legs of the bed, and each of which is configured to detect loads of the subjects and output the detected loads of the subjects as a load signal; a subject number determination unit configured to determine a number of the subjects on the bed based on a frequency spectrum of the load signal; and a waveform separation unit configured to separate a load component of each of the subjects from the load signal outputted from each of the plurality of load detectors, in a case that the number of the subjects on the bed is determined to be more than one, the separated load component is used for monitoring the biological information of each of the subjects. ### Claim 6 (depends on 5) The biological information monitoring system according to claim 5, wherein a waveform which presents a heartbeat of each of the subjects is monitored as the biological information.