JP2010167147A - Discriminating system and method for discriminating that human is separated from bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of a conventional reporting system and method which, on the principle of induction of a frequency of a commercial power source, although capable of discriminating a human body from an article, are incapable of accurately determining separation from a bed because a potential is in a floating state causing instable commercial alternating voltage induced to the human body, and which need electrical setting restricting a place for installation and causing a great deal of inconvenience. <P>SOLUTION: The discriminating system and method include a sensor and a body part. The sensor is provided with a coil element functioning as an LCR oscillation circuit by having an inductance (L) component, a capacitance (C) component, and a resistance (R) component. The body part is composed of an oscillation circuit that oscillates different oscillation frequencies based on a response of the sensor, a comparison part and setting part that compare the oscillation frequency of the oscillation circuit with a predetermined reference value, a controller that outputs a prescribed signal based on a comparison result in the comparison part, and a power source that supplies electric power to the entire discriminating system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an identification device for identifying that a person has left the bed such as a bed and a method for identifying the identification device.

  When caring for a patient at a hospital or a nursing facility, it is necessary to grasp the behavior of the patient for 24 hours. In particular, it is important to ascertain getting out of bed, such as a bed, as an action that should be taken most care of by a nurse. However, since a great burden is imposed on the nurse mentally and physically, various care support devices have been proposed to alleviate these. For example, a bed reporting device is disclosed that can quickly notify a nurse or the like that a patient or the like who needs care has left the bed (see Patent Document 1). In addition, a sensor that detects commercial AC voltage induced by the human body and a bed that detects the bed with respect to the human bedding based on the output from the sensor, in order to improve accuracy and prevent false detection of the patient A bed bed detection system and method including a detection device are disclosed (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 10-94525 JP 2008-62033 A

  The bed reporting device described in Patent Literature 1 detects that the bed user has left the bed and outputs a bed leaving signal, and receives the bed leaving signal from the detection unit and displays an attention signal outside. An external display means is provided, and a pressure sensing mat or the like is used as a detection means. When a patient or the like steps on the mat, it is determined that the patient is away from the bed, and this is displayed externally. However, in this notification device, erroneous detection may occur when a person other than the patient to be detected from bed leaving (for example, a nurse or a caregiver) steps on the mat. That is, since this detection means cannot distinguish between a person and an object, there is a problem that the detection accuracy is inaccurate and there are many malfunctions.

  The bed bed detection system and method described in Patent Document 2 are based on the principle of frequency induction of a commercial power supply, are formed by two upper and lower electrodes sandwiching a dielectric, and are guided by the two electrodes. The electrode is used as a signal. According to this, it is possible to distinguish between a person and an object, but when using a commercial frequency signal by induction, the commercial AC voltage induced to the human body becomes unstable because the potential is in a floating state, There is a problem that it is impossible to judge an accurate bed leaving. In addition, in this method, one of the two electrodes needs to be a ground electrode, so it must be installed electrically, and when used as a product, the installation location is limited, which is very inconvenient. is there.

  The present invention has been made in order to solve the above-described problem, and does not use a commercial frequency, does not require a ground electrode, and can obtain a very stable operation. It is an object of the present invention to provide an identification device and a method for identifying the identification device.

  The identification device of the present invention includes a sensor that reacts when a person or an object approaches or comes into contact (hereinafter referred to as contact or the like), and a main body that outputs a predetermined signal based on the reaction of the sensor. . The sensor includes a coil-shaped element having a capacitance (C) component and a resistance (R) component based on a coil shape and functioning as a CR oscillation circuit, or an inductance (L) component, a capacitance (C) component, and It has a resistance (R) component and has an LCR oscillation circuit, and the capacitance (C) or inductance (L) changes in response to contact of a person or an object. The main body includes an oscillation circuit unit that oscillates different oscillation outputs (E (v) or F (Hz)) based on the response of the sensor, and a reference value set in advance for the oscillation output of the oscillation circuit unit. The comparison setting unit includes a comparison setting unit, a control unit that outputs a predetermined signal based on a comparison result in the comparison setting unit, and a power supply unit that supplies power to the entire identification device.

Ｌ：インダクタンス
Ｃ：キャパシタンス Here, the principle of the identification device of the present invention will be described. As the oscillation circuit unit, a CR oscillation circuit or an LCR oscillation circuit is used. When a person or an object contacts the capacitance (C) or inductance (L) element, the oscillation output of the CR oscillation circuit or the LCR oscillation circuit (hereinafter referred to as an oscillation output) The oscillation frequency) changes. This is because the capacitance (C) or inductance (L) changes due to the influence of a person or an object. In general, the oscillation frequency Fsig is expressed by the following equation.

L: Inductance C: Capacitance

  The change in the oscillation frequency Fsig differs depending on an object that contacts the capacitance (C) or the inductance (L). For example, the oscillation frequency Fsig is clearly different between a case where shoes (including slippers) are brought into contact with the element and a human foot (including feet wearing socks). This sensor uses this. That is, when a person or an object is not in contact with the sensor, the oscillation frequency is F1 = 1,000 Hz. When a person is in contact with the sensor, the oscillation frequency is F2 = 400 Hz, and the object is in contact with the sensor. In this case, the oscillation frequency is F3 = 700 Hz. When the oscillation frequency of the oscillation circuit section is monitored, it is possible to identify whether a shoe or a person's foot is in contact with the sensor, so that the sensor can identify a person or an object. The signal of the oscillation frequency Fsig of the oscillation circuit unit is supplied to the comparison unit. On the other hand, in the setting unit, for example, the reference value is set by dividing the band of the oscillation frequency into three stages, and these are supplied to the comparison unit as the setting value Fref (E (v) or F (Hz)). The comparison unit compares the set value Fref with the oscillation frequency Fsig.

  According to this identification device, a person and an object can be easily identified. In addition, since a commercial frequency is not used and a ground electrode is unnecessary, it can be easily installed around the bed or in any place in the room. Further, the identification accuracy can be improved by a very stable operation.

  In the identification device of the present invention, the sensor is placed on the lower skin so as to cover the sheet-like lower skin, the coiled element of the metal foil formed on the lower skin, and the entire coiled element of the metal foil. It consists of an upper skin. In this case, the metal foil has a capacitance (C) component and a resistance (R) component based on the coil shape and functions as a CR oscillation circuit, or an inductance (L) component based on the coil shape, capacitance ( C) Since it has a component and a resistance (R) component and functions as an LCR oscillation circuit, when a person or an object comes into contact with the sensor, it is easily identified that the person or an object comes into contact due to a difference in oscillation frequency. Can do.

  In the identification device of the present invention, the main body section includes three output terminals that output different digital signals based on oscillation frequencies different between the person and the object when the person or the object comes into contact with each other. It is characterized by having. Thereby, when a person or an object comes into contact with the sensor, it is possible to easily know that the person has left the bed or the like by monitoring the digital signal output from the output terminal.

  In the identification device according to the present invention, the main body unit determines that an abnormality occurs when the bed leaving detection state continues continuously for a predetermined time or more based on an output from the sensor, and provides a notification means provided separately. It is characterized by notifying abnormality. This is to set the time for issuing an operation signal (alarm) from the control unit when a person or a person wearing socks touches the sensor. For example, when the time setting is set to 1 second, the person or socks is worn. When a person touches the sensor for more than 1 second, an operation signal is output from the control unit. According to this, since the operation signal when a person or a person wearing socks instantaneously touches the sensor for some reason can be prevented, malfunctions can be reduced.

  In the identification device according to the present invention, the main body unit compares the oscillation frequency from the sensor with a reference value to distinguish between bed leaving / bed-in, and the reference value oscillates when a person is wearing bare feet or socks. It is set so that the frequency and the oscillation frequency oscillated when wearing shoes or slippers can be identified. Thereby, when a person or an object contacts the sensor, it can be easily identified that the person or the object has contacted due to a difference in oscillation frequency.

In the identification method of the present invention, the sensor reacts when a person or an object touches, the oscillation circuit unit oscillates different oscillation frequencies based on the response of the sensor, and the oscillation frequency oscillated from the oscillation circuit unit Is compared with a reference value preset by the comparison setting unit, and a different digital signal is output from the control unit based on the comparison result of the comparison setting unit.
Thereby, a person and an object can be easily identified. In addition, since a commercial frequency is not used and a ground electrode is not required, it can be easily installed around the bed or in any place in the room. Further, the identification accuracy can be improved by a very stable operation.

  ADVANTAGE OF THE INVENTION According to this invention, the detection accuracy of the bed removal from a nursing person's bedding can be improved. Further, since it becomes possible to distinguish between barefoot and slippers, etc., it is possible to prevent erroneous detection caused by a nurse or an outpatient stepping on a sensor. Moreover, it can be conveniently installed on the floor around the bed or at any position in the room.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an identification device according to the present invention, FIG. 2 shows a sensor of the present invention, (a) is a plan view, and (b) is an XX of (a). It is line sectional drawing. FIG. 3 shows a coil-shaped element of the sensor of the present invention. (A) is a rectangular spiral shape, (b) is a strip shape, and (c) is a circular spiral shape. FIG. 4 shows an oscillation circuit according to the present invention, where (a) is a CR oscillation circuit and (b) is an LCR oscillation circuit. FIG. 5 shows the oscillation frequency of the present invention, where (a) is a state where nothing is in contact with the sensor, (b) is a state where a person is in contact, etc. (c) is a state where a shoe is in contact, etc. FIG. FIG. 6 is a diagram showing a digital output signal of the present invention. FIG. 7 is a block diagram showing an embodiment of the present invention.

  In FIG. 1, an identification device 1 is for identifying and detecting that a nursing person lying on a bed installed in a hospital or welfare facility has left the bed. It is configured. The sensor 2 and the main body 3 are connected by a cable 4. The sensor 2 reacts when a person or an object touches, and the capacitance (C) or inductance (L) of the sensor 2 changes. The main body 3 includes an oscillation circuit unit 31 that oscillates different frequencies based on the response of the sensor 2, and a comparison unit 32 and a setting unit 33 that compare the oscillation frequency of the oscillation circuit unit 31 with a preset reference value. The control unit 34 outputs a predetermined digital signal based on the comparison result from the comparison unit 32, and the power supply unit 35 supplies power to the identification device 1. In the present invention, the power supply unit 35 is a battery (dry battery, rechargeable storage battery, etc.), but a commercial power supply, a secondary battery, or the like can also be used. In addition, by attaching the main body 3 to the peripheral portion of the sensor 2, it can be easily installed around the bed or in an arbitrary place in the room.

  In FIG. 2, the sensor 2 has a sheet-like lower surface skin 21, a metal foil coil-shaped element 23 formed on the lower surface skin 21, and a lower surface skin 21 so as to cover the entire coil-shaped element 23 of the metal foil. It is composed of a top skin 22 that is covered. The lower surface skin 21 and the upper surface skin 22 are made of a synthetic resin sheet such as polyester, epoxy, polyimide, PVC, or PET, and a metal made of Al, Cu—Ni alloy, Ni—Cr alloy or the like on the upper surface of the lower surface skin 21. A foil coil-like element 23 is formed by pasting, laminating or printing. In order to take out a change in the capacitance (C) or inductance (L) of the sensor 2, oscillation frequency extraction openings 25 a and 25 b are provided at both ends (starting end and termination) of the coiled element 23, respectively. Oscillation frequency extraction cables 24a and 24b are connected to 25a and 25b.

  As shown in FIG. 3, the coil-like elements 23a, 23b, 23c of the metal foil can be formed by cutting with a cutter or the like, press punching, etc., (a) is a rectangular spiral, b) is a strip shape, and (c) is a circular spiral shape. Thereby, an inductor or a capacitor can be arbitrarily formed. The coil-like elements 23a, 23b, and 23c are not limited to this shape, and may have any shape as long as an inductor or a capacitor can be formed.

  FIG. 4A shows an example of a CR oscillation circuit. C1 and C2 are capacitors, R1, R2, R3 and R4 are resistors, and AMP is an amplifier. The frequency F (Hz) of the oscillation circuit is determined by the capacitance of the capacitor. FIG. 4B shows an example of the LCR oscillation circuit. C1 and C2 are capacitors, R1, R2, R3, and R4 are resistors, L is an inductor, and AMP is an amplifier. In the LCR oscillation circuit, the capacitor and the resistance are fixed, and the frequency F (Hz) of the oscillation circuit is determined by the value of the inductor.

  5 and 6, the oscillation frequency F1 when nothing is in contact with the sensor is 1,000 Hz, the oscillation frequency F2 is 400 Hz when a human foot is contacted, and the shoe is contacted. The oscillation frequency F3 is set to 700 Hz. On the other hand, the setting unit 33 shown in FIG. 1 sets the reference value 1 to 900 to 1,100 Hz, the reference value 2 to 300 to 500 Hz, and the reference value 3 to 600 to 800 Hz. Now, since the oscillation frequency when nothing touches the sensor 2 is F1 = 1,000 Hz and the reference value 1 = 900 to 1,100, the oscillation frequency F1 is included in the reference value 1. The digital signal 1 is output to the output a of the control unit 34. In this case, since the output frequency does not correspond to output B and output C, the digital signal is 0.

  In addition, since the oscillation frequency when a person's foot is brought into contact is F2 = 400 Hz and the reference value 2 = 300 to 500, the oscillation frequency F2 is included in the reference value 2, and therefore the output frequency of the control unit 34 is low. In addition, a digital signal 1 is output. In this case, since the output frequency does not correspond to output a and output c, it is a digital signal 0. Further, since the oscillation frequency when the shoe is brought into contact is F3 = 700 Hz and the reference value 3 = 600 to 800, the oscillation frequency F3 is included in the reference value 3. A digital signal 1 is output. In this case, since the output frequency does not correspond to output a and output b, the digital signal is 0. In this way, by monitoring the outputs a, b, and c, it is possible to identify what is in contact with the sensor 2 (whether a person has touched or an object has touched).

  In FIG. 7, the notification means 5 is connected to the main body 3 of the identification device by wire or wirelessly. The notification means 5 can be a nurse call system, a chime or a lamp. If an output signal is output from the main body 3 only when a person's foot or a person's foot wearing socks is placed on the sensor 2, a notification can be made by a chime or a lamp. In addition, if connected to a nurse call system, it can be notified by a nurse call. When there is nothing in the sensor 2 and when shoes or slippers come into contact, no output signal is output from the main body 3, so that the notification means 5 is not notified. In this way, it is possible to identify and notify a person or person wearing socks. When a person wears shoes, only the shoes are detected, and when a person wears slippers, only the slippers are detected.

  The present invention mainly relates to an identification apparatus and an identification method for identifying that a person has left the bed such as a bed. By using this function, it can be installed and used in an appropriate place in the facility for identifying a person and an object in a hospital, a welfare facility or a care facility.

It is the block diagram which showed the structure of the identification device based on this invention. The sensor of this invention is shown, (a) is a top view, (b) is XX sectional drawing of (a). The coil-shaped element of the sensor of this invention is shown, (a) is a rectangular spiral shape, (b) is a strip shape, (c) is a circular spiral shape. 1 shows an oscillation circuit of the present invention, in which (a) is a CR oscillation circuit and (b) is an LCR oscillation circuit. The oscillation frequency of this invention is shown, (a) is a state in which nothing is contacting the sensor, (b) is a state in which a person is in contact, (c) is a diagram showing a state in which a shoe is in contact, etc. It is. It is the figure which showed the digital output signal of this invention. It is the block diagram which showed the Example of this invention.

DESCRIPTION OF SYMBOLS 1 Identification apparatus 2 Sensor 3 Body part 4 Cable 5 Notification means 21 Lower surface skin 22 Upper surface skin 23, 23a, 23b, 23c Coiled element 24a, 24b Extraction cable 25a, 25b Exit 31 Oscillation circuit part 32 Comparison part 33 Setting part 34 Control unit 35 Power supply unit AMP amplifier C1, C2 Capacitor L Inductor R1, R2, R3, R4 Resistance

Claims (6)

A sensor that reacts when a person or an object approaches or touches, and a main body that identifies that the person has left the bed based on the response of the sensor,
The sensor has a coil-shaped element having a capacitance (C) component and a resistance (R) component based on a coil shape and functions as a CR oscillation circuit, or an inductance (L) component, a capacitance (C) component, and a resistance (R) A coil-shaped element having a component and functioning as an LCR resonance circuit;
The main body includes an oscillation circuit unit that oscillates different oscillation frequencies based on a response of the sensor, a comparison unit and a setting unit that compare the oscillation frequency of the oscillation circuit unit with a preset reference value, and the comparison An identification device for identifying that a person has left the bed, comprising: a control unit that outputs a predetermined signal based on a comparison result in the unit; and a power supply unit that supplies power to the entire identification device.   The sensor is composed of a sheet-like lower surface skin, a metal foil coil-shaped element formed on the lower surface skin, and an upper surface skin that covers the lower surface skin so as to cover the entire coil-shaped element of the metal foil. The identification device for identifying that a person has left the bed according to claim 1.   The said main-body part is provided with the output terminal according to an output signal which identifies and outputs a different digital signal, when a person or an object is detected with the said sensor. 3. An identification device for identifying that a person has left the bedding according to 2.   The main body is determined to be abnormal when the bed leaving detection state continues continuously for a predetermined time or more based on an output from the sensor, and notifies the abnormality to a separately provided notification means. An identification device for identifying that a person has left the bedding according to any one of claims 1 to 3.   The main unit compares the oscillation frequency from the sensor with a reference value to distinguish between getting out of bed / being in bed, and the reference value is an oscillation frequency oscillated when a person wears bare feet or socks and wears shoes or slippers. The identification device for identifying that a person has left the bed according to any one of claims 1 to 4, wherein the identification device is set so as to be distinguished from an oscillation frequency that is sometimes oscillated.   The sensor reacts when a person or an object approaches or comes into contact, and the oscillation circuit unit transmits different oscillation frequencies based on the response of the sensor, and the oscillation frequency oscillated from the oscillation circuit unit is compared with the comparison unit and the setting unit. An identification for identifying that a person has left the bedclothes, wherein a predetermined signal is output from the control unit by a person or an object based on a comparison result of the comparison unit and the control unit outputs a predetermined signal based on the comparison result of the comparison unit Method.

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