JP6671184B2 - Biological monitoring device - Google Patents

Description

  The present invention relates to a living body monitoring device that simultaneously acquires biological information of a minute signal and a signal having a large level at which a weight can be estimated from a single air mat and detects bed leaving and estimates the weight.

  In hospitals, facilities for the elderly, etc., for the safety and physical condition management of patients, residents, etc., an out-of-bed detection device (for example, Patent Document 1) capable of accurately detecting an out-of-bed state and measuring body weight to measure physical condition. 2. Description of the Related Art There is known a patient weight measurement device for managing patients (for example, Patent Document 2).

JP 2004-105416 A JP-A-2004-271368

  The bed leaving detection device disclosed in Patent Document 1 uses a sensor that detects the weight of the bed and the weight detected by the sensor to detect the presence of the patient on the bed and the absence of the patient on the bed. The state is determined, and when it is determined that the state has transitioned from the occupied state to the absent state, the fact that the apparatus is in the wake-up state is notified to prevent false reports and unreported reports.

  In addition, the patient weight measuring device disclosed in Patent Literature 2 opens a solenoid valve while holding the patient on an air mat, discharges air, gradually lowers the internal pressure of the air mat, and reduces the internal pressure of the air mat and the air mat. The weight of the patient is measured by balancing the load including the patient and the weight of the patient.

  In any case, since the load is detected to detect the leaving state and the weight is estimated, the apparatus becomes large-sized, and there is a problem that it cannot be executed with a simple configuration.

  The present invention has been made in view of the above-described problems. An air mat is laid on a bed, and a small signal of biological information and a large signal at which a weight can be estimated can be simultaneously obtained from one air mat. It is intended to enable leaving bed detection and weight estimation.

In order to achieve the above object, the living body monitoring device according to claim 1 is an air mat for transmitting the load of a sleeping person sleeping on a bed by air pressure fluctuation, and a hollow for transmitting air pressure fluctuation of the air mat to a signal processing device. Air tube, a branch connector for branching the air tube into two in the signal processing device, a micro differential pressure sensor for detecting a biological signal by connecting to one of the air tubes branched from the branch connector, and A pressure sensor for measuring the pressure difference between the atmospheric pressure and the air pressure of the air mat.The signal processing device increases the value of the pressure sensor by a predetermined value or more, and outputs a biological signal from the minute differential pressure sensor. that when it is detected determines that the implantation conditions, the value of the pressure sensor a predetermined value or more from the implantation condition is characterized by emitting a wakeup alarm is determined that the wake-up state when the drops A.

In addition, the living body monitoring device according to claim 2, an air mat that transmits the load of a sleeping person who is sleeping on a bed by air pressure fluctuation, a hollow air tube that transmits air pressure fluctuation of the air mat to a signal processing device, A branch connector that branches the air tube into two in the signal processing device, a micro differential pressure sensor that connects to one of the air tubes branched from the branch connector to detect a biological signal, and an atmospheric pressure that connects to the other air tube. A pressure sensor for measuring a pressure difference between the air pressures of the air mats, and a signal processing device, when the value of the pressure sensor increases by a predetermined value or more, and when a biological signal is detected from the slight differential pressure sensor. When it is determined that the patient is in the landing state, the value of the barometric pressure sensor has decreased by more than a certain value from the landing state, and no biological signal is detected from the minute differential pressure sensor for more than a certain time after the value of the barometric pressure sensor has dropped. Is characterized in that to emit lifting alarm is determined that the lifting state.

The biological monitoring device according to claim 3 is the biological monitoring device according to claim 1 or 2, wherein the signal processing device determines that the air mat has leaked air when the value of the barometric pressure sensor falls below a certain value. And outputs an abnormal signal .

The biological monitoring device according to claim 4 is the biological monitoring device according to claims 1 to 3 , wherein the signal processing device is configured such that the pressure sensor at the time of landing is provided when the value of the pressure sensor increases by a predetermined value or more. The weight of a sleeping person who is sleeping on a bed is estimated by measuring the fluctuation of the air pressure from the value of .

  ADVANTAGE OF THE INVENTION According to this invention, the air mat which transmits the load of the sleeper who sleeps on a bed by air pressure fluctuation | variation, the hollow air tube which transmits the air pressure fluctuation | variation of an air mat to a signal processing apparatus, and signal processing an air tube A branch connector that branches into two inside the device, a micro-differential pressure sensor connected to one air tube branched from the branch connector to detect a biological signal, and an atmospheric pressure and air pressure of an air mat connected to the other air tube. Since the air pressure sensor for measuring the pressure difference is provided, it is possible to simultaneously obtain biological information of a minute signal and a signal having a large level at which the weight can be estimated from the same air mat, and thus it is possible to detect bed leaving and estimate the weight.

  Further, according to the present invention, when the value of the barometric pressure sensor becomes equal to or less than a certain value, it is determined that air is leaking from the air mat and an abnormal signal is output, and the value of the barometric pressure sensor increases by a predetermined value or more, And, when a biological signal is detected from the slight differential pressure sensor, it is determined that the patient is in the landing state, and when the value of the atmospheric pressure sensor has decreased from the landing state by a certain value or more, it is determined that the user is in the wake-up state and a wake-up alarm is issued, If the value of the barometric pressure sensor decreases by a certain value or more from the landing state and the biological signal is not detected from the minute differential pressure sensor for a certain period of time after the pressure sensor value decreases, it is determined that the user has left the bed and an alarm is issued. Therefore, the leaving alarm can be issued in a short time with a simple circuit configuration.

  Still further, according to the present invention, when the value of the barometric pressure sensor rises by a predetermined value or more, the variation of the air pressure is measured from the value of the barometric pressure sensor at the time of landing, so that the sleeping person sleeping on the bed is measured. Since the weight can be estimated and notified to the outside, it is possible to easily estimate the weight of a sleeping person who needs assistance while staying in the bed without measuring the weight of the entire bed.

It is a key map showing an example of use of a living body monitor device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram showing one embodiment of a living body monitoring device of the present invention. (A) is an external view which shows an example of a signal processing apparatus, (b) is the elements on larger scale which show a pneumatic indicator. FIG. 4 is a data flow diagram of the CPU showing the operation of the signal processing device. It is the figure which represented the signal waveform at the time of landing in time series. It is the figure which expressed the signal waveform at the time of getting up and leaving a bed in time series.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, reference numeral 10 denotes an air mat for transmitting the load of a sleeping person 30 sleeping on a bed 20 by air pressure fluctuation. Numeral 40 denotes a hollow air tube for transmitting fluctuations in air pressure of the air mat 10 to the signal processing device 50. The signal processing device 50 is supplied with power from the AC adapter 70, and outputs various alarm sounds corresponding to fluctuations in the air pressure of the air mat 10 to the notification terminal unit 80.

  As shown in FIGS. 1 and 2, the air mat 10 is laid on a bed 20, and sheets and the like are used thereon. The air mat 10 is connected to the signal processing device 50 via a detachable coupler 41 via an air tube 40. The coupler 41 attached to the air tube 40 is provided with an air leakage prevention valve, so that the air in the air mat 10 does not escape even if the air tube 40 is removed from the signal processing device 50. When the air mat 10 becomes dirty, the air tube 40 can be removed from the signal processing device 50 with the coupler 41 and washed with water. If the air pressure of the air mat 10 is too low, signals such as vital signs cannot be obtained, and if it is too high, the sleeping comfort becomes poor, and the air mat 10 may be damaged, so that an appropriate value, for example, about 2 kPa to 4 kPa, Need to be kept. The air tube 40 is required to have flexibility and to have appropriate rigidity so as not to be broken or crushed so as not to hinder the transmission of air vibration in order to cover the air mat 10 with sheets or the like. . As a result of examining various materials, a vinyl chloride tube with an outer diameter of about 8 mm and an inner diameter of about 4 mm is suitable.

  The air tube 40 is branched into two air tubes 42 and 43 by a branch connector 51 in the signal processing device 50, and one of the air tubes 42 branched from the branch connector 51 serves as a minute differential pressure sensor for detecting a biological signal. A condenser microphone 52 is connected, and a pressure sensor 53 for measuring a pressure difference between the atmospheric pressure and the air pressure of the air mat 10 is connected to the other air tube 43. The output of the condenser microphone 52 is amplified by the amplifier circuit 52a so as to have an appropriate signal level, and is input to the CPU 54. Similarly, the output of the atmospheric pressure sensor 53 is amplified by the amplifier circuit 53a so as to have an appropriate signal level, and is input to the CPU 54. The CPU 54 controls a mode changeover switch 55 for switching between the wake-up / wake-up mode, a notification speed changeover switch 56 for switching the notification speed, a temperature sensor 57 for measuring the ambient temperature to correct the pressure value of the air mat 10, and a notification stop. The pause switch 58 is connected. The output of the CPU 54 includes a serial output circuit 59 for outputting biological information such as a heart rate, a respiratory rate and an estimated weight as numerical data, an alarm output circuit 60 for outputting a wake-up / wake-up notification signal, and an air pressure for displaying the air pressure of the air mat 10. It is connected to the display 61.

  As shown in FIG. 3A, the signal processing device 50 includes a mode changeover switch 55 for switching between a wake-up / wake-up notification mode, a notification speed changeover switch 56 for switching a notification speed (early / slower), a pause switch 58, and an air pressure. The display 61 is mounted, and the mode changeover switch 55 can be used to switch between sending out an alarm in a rising state and sending out an alarm in a leaving state. The time from when the wake-up state or the wake-up state is detected by the notification speed switch 56 to when the notification output is actually output can be switched. Since the air pressure of the air mat 10 fluctuates at the ambient temperature, the pressure value of the air mat 10 can be corrected by measuring the temperature. The air pressure indicator 61 allows the user to determine whether the air pressure of the air mat 10 is appropriate. For example, as shown in FIG. 3B, five LEDs for display are arranged, and the pressure increases as going to the right. The leftmost LED L1 indicates an abnormal state in which the pressure is decreasing, and is bright red to call attention. The rightmost LEDL5 is similarly bright red in order to warn that the air pressure is too high and the mat may be damaged. The middle three LEDs L2, L3, L4 are green with reduced brightness with LEDs of appropriate pressure that do not prevent sleep. In the case of a failure of the device, all the LEDs are displayed and blinked to indicate that the device is not operating normally.

  Next, the operation of the biological monitoring device of the present invention will be described with reference to the data flow diagram of the CPU shown in FIG. When the AC adapter 70 that supplies power to the signal processing device 50 is disconnected from the outlet (see FIG. 1), the power supply is detected, the device is determined to be faulty, an abnormal signal is output, and the LED is controlled to control the air pressure indicator 61. All LEDs are displayed and blinked to notify the administrator of the abnormality. The signal processing device 50 includes a large-capacity capacitor and a built-in battery so that the device can operate even after the power is turned off for at least a time (for example, about 1 to 3 seconds) at which the notification signal is output. Biological analysis is performed by a condenser microphone as a minute differential pressure sensor that detects a biological signal such as a heart rate and a respiratory rate from the air pressure fluctuation of the air mat 10 and outputs a biological signal such as a heart rate and a respiratory rate. Further, the pressure difference between the atmospheric pressure and the air pressure of the air mat 10 is measured by the air pressure sensor from the fluctuation of the air pressure of the air mat 10. At the time of manufacture, an output level (voltage value) of 1 atm is written in a flash memory inside the CPU in order to reduce variations due to individual differences of the atmospheric pressure sensors. Since the air pressure of the air mat 10 varies depending on the ambient temperature, the ambient temperature is measured by a temperature sensor to correct the pressure value of the air mat 10. If no signal is input to the condenser microphone even though the value of the atmospheric pressure sensor fluctuates, it is determined that the condenser microphone has failed (device failure determination), and the pressure measurement value of the atmospheric pressure sensor 53 is zero (atmospheric pressure and air mat). When the air pressure of the air mat 10 is equal to or less than a predetermined value (for example, 1 kPa or less), it is determined that the air mat 10 is not connected or air is leaking (equipment failure determination), an abnormal signal is output, and the air pressure is displayed. All the LEDs of the device 61 are displayed and blinked to notify the administrator of the abnormality. When the bed sheet is exchanged, when the temporary stop switch 58 is pressed, the notification stop control is activated. For example, the notification output is stopped for three minutes after the switch is pressed.

  Next, the operation of the biological monitoring device at the time of landing will be described. FIG. 5 is a signal waveform at the time of landing, showing the air pressure of the air mat measured by the air pressure sensor and the minute air pressure change (biological signal) observed by the condenser microphone. When the pressure value p0 of the atmospheric pressure sensor 53 rises at a certain value p1 or more (for example, 2 kPa or more) at time t1, it is determined that a person or a luggage has got on the air mat 10, and a large biological signal is observed from time t1 to t2. It is determined that a person is moving on the air mat. After time t2, the biological signal is periodically observed, and a signal having a constant amplitude a1 or more is made valid to suppress the influence of noise. At the time t3 when the air pressure rises by a certain value p1 or more and a biological signal having a certain amplitude a1 or more is observed for a certain time or more (for example, five seconds or more), it is determined that the vehicle is in the landing state. This prevents erroneous determinations such as when luggage is placed on the air mat.

  Next, the operation of the living body monitor device when waking up will be described. In FIG. 4, when a change in air pressure of the air mat is measured using a biological analysis signal measured by a condenser microphone and a pressure conversion signal measured by an air pressure sensor, a wake-up / wake-up analysis process is used to determine wake-up, and In the wake-up / wake-up notification control processing, a wake-up alarm is output and data is output as biological information and the like. The signal waveform at the time of getting up and leaving the bed shown in FIG. 6 shows the air pressure of the air mat measured by the air pressure sensor and the minute air pressure change (biological signal) observed by the condenser microphone. At time t1 from the landing state, the body is moved on the air mat to enter the preparation for getting up, so that a biological signal having a large amplitude is observed. Since the body was raised at time t2, the air pressure decreased by a certain value p2 or more, and when the state passed for a certain period of time and passed time t4, it was determined that the body had separated (was up) from the air mat 10 and a wakeup alarm was output. .

  Next, the operation of the biological monitoring device when leaving the bed will be described. In FIG. 4, when a change in the air pressure of the air mat is measured by a condenser microphone and a pressure conversion signal measured by a barometric pressure sensor is used to determine the leaving of the bed in the wake-up / leaving-out analysis processing, In the wake-up / wake-up notification control processing, a wake-up alarm is output and data is also output as biological information. In the signal waveform at the time of getting up and leaving the bed shown in FIG. 6, a biological signal having an amplitude b or more is observed even when the pressure becomes p2 or less because the body is awake from time t2 to t3 but is still on the bed. Have been. At time t3, the biological signal becomes equal to or less than the amplitude b, and becomes a level that can hardly be detected from the condenser microphone. Output.

  Whether to output the wake-up alarm in the wake-up state or to output the wake-up alarm in the wake-up state can be switched by a mode changeover switch 55 provided in the signal processing device 50. In addition, in order to reduce the influence of a short-time operation such as turning over, etc., the determination of the wake-up state and the wake-up state is actually performed. I'm going later. The times t4 and t5 can be set by the notification speed switch 56.

  Since the air pressure of the air mat 10 changes in proportion to the load on the mat, when the value of the air pressure sensor 53 increases by a predetermined value p1 or more, the value p0 of the air pressure sensor 53 at the time of landing (see FIG. 5). ), The load on the mat can be determined, and from this value, the weight of the sleeping person sleeping on the bed can be estimated and notified to the outside.

  In addition to the notification signal, biological information including heart rate, respiratory rate, estimated weight, etc. as numerical data, frequency and number of times of turning over, number and time of snoring, conditions such as landing, getting up and getting out of bed, and failure contents were included. The status and the like of the system components can be transmitted as serial data from the serial output circuit 59 to the outside through wired communication such as a USB interface or wireless communication such as a wireless LAN or Bluetooth.

  As described above, a thin air mat is laid on the bed, and a condenser microphone that can detect minute air pressure fluctuations detects biological signals (respiration, heartbeat, snoring) and detects the difference between atmospheric pressure and air pressure inside the mat. The air pressure sensor detects whether an appropriate amount of air is in the air mat and whether the air mat is under a load, thereby reducing the effects of noise such as building vibration, human footsteps, and door opening and closing sounds. Without receiving it, it is possible to quickly and accurately perform the leaving-bed detection and the weight estimation.

DESCRIPTION OF SYMBOLS 10 Air mat 20 Bed 30 Sleeping person 40 Air tube 50 Signal processing device 51 Branch connector 52 Micro differential pressure sensor (condenser microphone)
53 barometric pressure sensor 54 CPU
55 Mode changeover switch 56 Notification speed changeover switch 57 Temperature sensor 58 Temporary stop switch 59 Serial output circuit 60 Alarm output circuit 61 Air pressure indicator

Claims (4)

An air mat for transmitting the load of a sleeper who is sleeping on a bed by air pressure fluctuation, a hollow air tube for transmitting air pressure fluctuation of the air mat to a signal processing device, and the air tube in the signal processing device. A branch connector, a minute differential pressure sensor connected to one air tube branched from the branch connector to detect a biological signal, and a pressure difference between atmospheric pressure and the air pressure of the air mat connected to the other air tube. And a signal processing device, wherein the signal processing device is in a landing state when the value of the pressure sensor increases by a predetermined value or more, and when the biological signal is detected from the slight differential pressure sensor. A living body monitor device which determines that the user is in the wake-up state and issues a wake-up alarm when the value of the pressure sensor decreases by a certain value or more from the landing state . An air mat for transmitting the load of a sleeper who is sleeping on a bed by air pressure fluctuation, a hollow air tube for transmitting air pressure fluctuation of the air mat to a signal processing device, and the air tube in the signal processing device. A branch connector, a minute differential pressure sensor connected to one air tube branched from the branch connector to detect a biological signal, and a pressure difference between atmospheric pressure and the air pressure of the air mat connected to the other air tube. And a signal processing device, wherein the signal processing device is in a landing state when the value of the pressure sensor increases by a predetermined value or more, and when the biological signal is detected from the slight differential pressure sensor. It is determined that the value of the barometric pressure sensor has decreased from a landing state by a certain value or more, and a biological signal is detected from the minute differential pressure sensor for a certain time or more after the value of the barometric pressure sensor has decreased. Biological monitoring apparatus characterized by issuing a lifting alarm is determined that the lifting state when the non. The biological monitoring device according to claim 1, wherein the signal processing device outputs an abnormal signal when the value of the air pressure sensor becomes equal to or less than a predetermined value, determining that the air mat is leaking. . The signal processing device measures the weight of a sleeping person who is sleeping on the bed by measuring a change in air pressure from the value of the pressure sensor at the time of landing when the value of the pressure sensor rises by a predetermined value or more. biological monitoring apparatus of claims 1 to 3, wherein the estimating the Tell to the outside.

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