JP6455774B2 - Biological information detection system - Google Patents

Description

  The present invention relates to a biological information detection system and a bed that detect a state of a living body.

  In the field of welfare or care, a system for detecting the status of a caregiver or care recipient such as an elderly person or a sick person lying on a bed has been proposed (for example, see Patent Document 1).

  In such a system, using a Doppler sensor, which is a radio wave sensor installed on the ceiling or wall of the room where the bed is placed, the state of breathing or body movement of the cared person in the bed is detected.

JP 2012-5745 A

  However, the above system has a problem that the state of a living body such as a care recipient cannot be detected with high accuracy.

  Therefore, an object of the present invention is to provide a biological information detection system with high detection accuracy.

In order to achieve the above object, one aspect of a biological information detection system according to the present invention is a biological information detection system that detects a state of a biological body, and is attached to a portion of each of a plurality of beds below a mattress. A biological information detection device that transmits radio waves to the upper side of the mattress, receives reflected waves of the radio waves, and detects a state of the living body on the mattress based on the reflected waves ; Each of the biological information detection devices includes a display device that displays the state of the biological body detected by the biological information detection device, and each of the plurality of biological information detection devices indicates the detected biological state. When it is determined whether or not the biological value to be shown is within the common warning range registered by the display device, and is determined to be within the common warning range An alert signal is transmitted to the display device, and the display device communicates with the plurality of biological information detection devices, thereby registering a common range as the common warning range for the plurality of biological information detection devices. When receiving the alert signal, the light output by the image display or audio output, it informed of the reception of the alert signal.

  According to the present invention, it is possible to improve the detection accuracy of the state of a living body.

FIG. 1 is a configuration diagram of a biological information detection system according to an embodiment. FIG. 2 is a diagram illustrating a mounting location of the biological information detection device according to the embodiment. FIG. 3 is a diagram showing a more detailed mounting location of the biological information detecting device in the embodiment. FIG. 4 is a diagram illustrating an example of attachment of the biological information detection device according to the embodiment. FIG. 5 is a diagram illustrating another example of attachment of the biological information detection device according to the embodiment. FIG. 6 is a block diagram illustrating a functional configuration of the biological information detection system according to the embodiment. FIG. 7 is a diagram illustrating the content of warning range information stored in the warning range storage unit according to the embodiment. FIG. 8 is a sequence diagram illustrating processing performed between the biological information detection device and the display device 200 according to the embodiment. FIG. 9 is a flowchart illustrating the processing operation of the biological information detection apparatus according to the embodiment. FIG. 10 is a flowchart illustrating the processing operation of the display device according to the embodiment. FIG. 11A is a diagram illustrating an example of a screen displayed by the display device in the embodiment. FIG. 11B is a diagram illustrating an example of a screen displayed by the display device after transmission of a transmission command in the embodiment. FIG. 12A is a diagram illustrating another example of a screen displayed by the display device in the embodiment. FIG. 12B is a diagram illustrating another example of a screen displayed by the display device after transmission of a transmission command in the embodiment. FIG. 13A is a diagram illustrating another example of a screen displayed by the display device in the embodiment. FIG. 13B is a diagram illustrating another example of a screen including a biological window displayed by the display device according to the embodiment. FIG. 14 is a block diagram illustrating a configuration of the detection unit in the embodiment. FIG. 15 is a block diagram illustrating a configuration of the signal analysis unit in the embodiment. FIG. 16A is a diagram illustrating a scalogram generated by wavelet transform using a Mexican hat function in the embodiment. FIG. 16B is a diagram illustrating a scalogram generated by wavelet transform using a Gabor function in the embodiment. FIG. 17A is a diagram illustrating a positional relationship between the position of the living body and the living body information detection apparatus in the embodiment. FIG. 17B is a diagram illustrating an I signal and a Q signal observed for each position of a living body in the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention will be described as optional constituent elements that constitute a more preferable embodiment.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
FIG. 1 is a configuration diagram of a biological information detection system in the present embodiment.

  The biological information detection system 1 in the present embodiment is a so-called monitoring system installed in a facility where a plurality of beds 300 are placed, such as a hospital or a nursing facility. Specifically, the living body information detection system 1 includes a plurality of living body information detection devices 100 that detect the state of each living body, and a display device 200 that displays the state of the living body detected by these living body information detection devices 100. Prepare. Note that the living body is an elderly person, a sick person, a caregiver, or a care recipient who uses the bed 300 in the facility, but in this embodiment, a care receiver will be described as an example of a living body. The living body state is a movement of the living body, for example, a body movement such as a heartbeat, a pulse, breathing, or turning over. Further, the number of such movements is expressed as a biological value. In the present embodiment, the heartbeat and the pulse will be described as synonymous without being distinguished.

  The biological information detection apparatus 100 is attached to a bed 300 in a facility, and detects the state of a cared person on the bed 300 by transmitting and receiving radio waves such as microwaves. Then, if there is an abnormality or the like in the detected cared person's state, the biological information detection device 100 issues an alarm to the display device 200 by transmitting an alert signal described later. For example, the biological information detection device 100 issues a warning to the display device 200 when a state in which no care recipient has a heartbeat continues for a predetermined period. Furthermore, the biological information detection device 100 transmits biological information indicating the detected state of the care receiver to the display device 200 in response to a command from the display device 200.

  The display device 200 is installed, for example, in a care station of a care facility, and communicates with each of the biological information detection devices 100 via power line carrier communication (hereinafter referred to as PLC: Power Line Communication). Accordingly, when the display device 200 receives the alert signal from the biological information detection device 100 via the PLC, the display device 200 issues an alarm to the care staff. In addition, when the display device 200 instructs the biological information detection device 100 via the PCL and receives the biological information from the biological information detection device 100, the display device 200 displays the state of the care recipient indicated by the biological information.

  FIG. 2 is a diagram illustrating a mounting location of the biological information detection apparatus 100.

  As shown in FIG. 2, the bed 300 includes a bottom 310 on which the mattress 400 is placed, a metal frame 320 that supports the bottom 310, and an adjustment mechanism 330 that adjusts the posture and height of the bottom 310. Prepare. The cared person lies on the mattress 400 of the bed 300 or takes an end-sitting posture.

  The biological information detection apparatus 100 is attached to such a bed 300. That is, the biological information detection apparatus 100 is attached to a portion of the bed 300 below the mattress 400. More specifically, the biological information detection apparatus 100 is attached to a part of the frame 320 below the bottom 310.

  The biological information detection apparatus 100 transmits a radio wave from the portion attached in this way toward the upper side of the mattress 400 and receives a reflected wave of the radio wave. Then, the biological information detection apparatus 100 detects the state of the cared person on the mattress 400 based on the reflected wave.

  FIG. 3 is a diagram showing a more detailed mounting location of the biological information detection apparatus 100. 3A is a view of the bed 300 from which the mattress 400 is removed as viewed from above, and FIG. 3B is a view of the bed 300 as viewed from below.

  The bottom 310 includes a substantially flat plate-like back bottom 311, a waist bottom 312, a knee bottom 313, and a foot bottom 314, respectively. The back bottom 311, the waist bottom 312, the knee bottom 313, and the foot bottom 314 are arranged along the longitudinal direction of the bed 300, and are rotatably connected to the bottoms adjacent to each other.

  As shown in FIG. 3, the biological information detection apparatus 100 is attached to a part of the frame 320 that is below the back bottom 311.

  Here, the frame 320 includes a plurality of beams 321. For example, each of the plurality of beams 321 is arranged in the longitudinal direction along a direction perpendicular to the longitudinal direction of the bed 300 on a plane parallel to the bottom 310. The biological information detection device 100 is attached to the beam 321 that is closest to the chest of the care receiver when the care receiver lies on the bed 300 among the beams 321. More specifically, the biological information detection apparatus 100 is attached to the central portion of the beam 321.

  Further, the adjustment mechanism 330 described above includes, for example, a plurality of arms, and the height of the back bottom 311, the waist bottom 312, the knee bottom 313, and the foot bottom 314 is changed by moving the frame 320 up and down with the plurality of arms. In this case, the positional relationship between the plurality of beams 321 and the bottom facing the beams 321 does not change. That is, even if the height of the back bottom 311 changes, the relative positional relationship between the back bottom 311 and the biological information detection apparatus 100 attached to the beam 321 facing the back bottom 311 does not change.

  FIG. 4 is a diagram illustrating an example of attachment of the biological information detection apparatus 100. FIG. 4 is a view of the bed 300 as viewed from obliquely below.

  The biological information detection apparatus 100 is fixed to the upper surface of the beam 321 of the frame 320 by a fixing tool 329. The fixture 329 is, for example, a metal plate, and the biological information detection apparatus 100 is fixed so that the beam 321 is sandwiched between the fixture 329 and the fixture 329.

  FIG. 5 is a diagram illustrating another example of attachment of the biological information detection apparatus 100.

  In the example illustrated in FIG. 4, the biological information detection apparatus 100 is fixed to the upper surface of the beam 321, but may be fixed so as to be sandwiched between two beams 321 as illustrated in FIG. 5. That is, the biological information detection apparatus 100 is attached on the fixture 328 suspended between the two beams 321.

  As described above, in the biological information detection system 1 in the present embodiment, the biological information detection device 100 is attached to the bed 300. Therefore, even if the bed 300 moves, the relative positional relationship between the bed 300 and the cared person and the biological information detection device 100 does not change, so that a decrease in detection accuracy due to the movement of the bed 300 can be suppressed. For example, in the system of Patent Document 1, since the radio wave sensor is attached to the ceiling, if the bed moves, the relative positional relationship between the bed, the cared person, and the radio wave sensor changes, and the detection accuracy decreases. There are things to do. However, in the present embodiment, as described above, since the positional relationship does not change, a decrease in detection accuracy can be suppressed. Therefore, even in the case of a cared person who needs to move the bed 300 on a daily basis, such as a cared person with dementia, in this embodiment, the state of the cared person can be detected appropriately. it can.

  Furthermore, in the present embodiment, biological information detection device 100 is attached to a portion of bed 300 below mattress 400. Therefore, there is a low possibility that a demented care recipient will move or remove the biological information detection device 100. As a result, it is possible to suppress a sudden decrease in detection accuracy.

  Furthermore, in the present embodiment, biological information detection device 100 is attached to a part of frame 320 below bottom 310. Therefore, it is possible to suppress the biological information detection apparatus 100 from being displaced due to the movement of the care recipient. Furthermore, in this embodiment, when the cared person is on the bed 300, not only the reflected wave from the cared person but also the reflected wave from the bottom 310 is received. Here, the movement of the care recipient is transmitted to the bottom 310, and the bottom 310 may also move. Therefore, in the present embodiment, by receiving each reflected wave described above, it is possible not only to directly detect the movement of the cared person but also indirectly. Further, the bottom 310 may be made of a material such as metal that is difficult to transmit radio waves. In this case, even if the radio wave transmitted from the biological information detection device 100 does not reach the care recipient, the biological information detection device 100 according to the present embodiment receives the reflected wave from the bottom 310, thereby receiving the care recipient. The state of can be detected indirectly. Thereby, the state of the cared person, that is, the movement of the cared person can be accurately detected. In addition, simply detecting the movement of the cared person may cause the reflected wave to be easily attenuated depending on the position or orientation of the cared person, and the reflected wave may not be received appropriately. However, in this embodiment, since the movement of the cared person is also indirectly detected as described above, the movement of the cared person is appropriately determined without being affected by the position or orientation of the cared person. Can be detected. Further, the heights of the back bottom 311, the waist bottom 312, the knee bottom 313, and the foot bottom 314 may be changed for nursing care. Even in this case, in the present embodiment, since the living body detection device 100 is attached to the beam 321 of the frame 320 that moves together with the back bottom 311, a decrease in detection accuracy due to a change in the height thereof can be suppressed. . That is, the relative positional relationship between the back bottom 311 and the living body detection apparatus 100 can be kept constant, and a decrease in detection accuracy due to a change in the positional relationship can be suppressed.

  Furthermore, in this embodiment, since the biological information detection apparatus 100 detects the state of the living body by transmitting and receiving radio waves, it can perform non-contact detection on the living body and depends on the physique (thin and thick) of the care recipient. Without being able to detect the state of the care recipient with high accuracy.

  Moreover, in this Embodiment, as above-mentioned, each biometric information detection apparatus 100 and the display apparatus 200 communicate via PLC. The effect of using this PLC will be described below.

  For communication between each biological information detecting device 100 and the display device 200, it is also possible to use a nurse call signal line laid in a hospital or a nursing facility, or a wired or wireless Internet communication. However, the nurse call signal line and Internet communication have the following problems.

  In the nurse call signal line, there is a problem that information to be transmitted is limited to a data amount of about 1 bit signal (on or off). Further, in Internet communication, a large amount of data can be transmitted, but there is a large burden for constructing the communication environment in the facility, and there is an economic problem.

  Therefore, in the present embodiment, by using the PLC, communication can be easily performed at a low cost without being limited by the amount of data. In addition, the communication environment can be easily expanded and relocated. Therefore, the biological information detection system 1 according to the present embodiment can be used in various facilities and for the care recipient in each state. Specifically, if the care station display device 200 is initially introduced in the facility, the biological information detection device 100 can be easily added or relocated as necessary. This allows the facility to enjoy economic benefits.

  Hereinafter, the functional configuration of the biological information detection system 1 will be described in detail.

  FIG. 6 is a block diagram showing a functional configuration of the biological information detection system 1.

  The biological information detection apparatus 100 includes a detection unit 110, an alert determination unit 130, a warning range storage unit 140, a registration unit 150, a detection control unit 160, a detection communication unit 170, and a detection result storage unit 180.

  The detection communication unit 170 communicates with the display device 200 via the PLC.

  The detection unit 110 transmits a radio wave and receives a reflected wave of the radio wave. Then, the detection unit 110 detects the biological value of the cared person, specifically, the number of pulses, breathing, and body movement per unit time based on the reflected wave. The detection unit 110 notifies the alert determination unit 130 of the detected biological value, and stores the biological value in the detection result storage unit 180 as a detection result.

  As described above, the detection result storage unit 180 is a recording medium for storing the biological value detected by the detection unit 110. For example, the detection result storage unit 180 can store biological values for a predetermined period such as several hours or several days.

  The warning range storage unit 140 is a recording medium for storing information indicating the warning range of the biological value of the care recipient (hereinafter referred to as warning range information).

  The alert determination unit 130 determines whether or not the biological value detected by the detection unit 110 is within the warning range. If the alert determination unit 130 determines that the biological value is within the warning range, the alert determination unit 130 displays an alert signal via the detection communication unit 170. Send to. Note that the alert determination unit 130 may directly acquire the biological value detected by the detection unit 110 by a notification from the detection unit 110, and by reading the biological value stored in the detection result storage unit 180, You may acquire the detected biological value indirectly. The alert determination unit 130 may include a buffer. That is, when the alert determination unit 130 directly acquires the detected biometric value based on the notification from the detection unit 110, the alert determination unit 130 temporarily stores the acquired biometric value in the above-described buffer. Thereby, the alert determination part 130 can determine whether not only the latest detected value detected but the biometric value detected in the past is in a warning range. Furthermore, the alert determination part 130 can determine whether the biometric value detected at any time continues within a warning range for a predetermined period.

  The registration unit 150 receives registration information from the display device 200 via the detection communication unit 170. Then, the registration unit 150 stores the registration information in the warning range storage unit 140 as the warning range information described above. This registration information is information generated by the display device 200 and indicating the warning range of the care receiver's biometric value.

  When receiving a transmission command from the display device 200 via the detection communication unit 170, the detection control unit 160 transmits biological information indicating the biological value detected by the detection unit 110 to the display device 200 via the detection communication unit 170. To do. Specifically, the detection control unit 160 reads the biometric value detected by the detection unit 110 from the detection result storage unit 180, and generates and transmits biometric information indicating the biometric value. The biometric value indicated in the biometric information may be the current biometric value, the past biometric value (for example, the biometric value of yesterday), or the current and past biometric value. . Note that the detection control unit 160 directly acquires the biological value detected by the detection unit 110 from the detection unit 110 without using the detection result storage unit 180, and transmits the biological information indicating the biological value to the display device 200. May be.

  The display device 200 includes a display unit 210, a display control unit 220, a care database 240, a display communication unit 250, and an input unit 260.

  The display communication unit 250 communicates with the plurality of biological information detection devices 100 via the PLC.

  The display unit 210 is, for example, a liquid crystal display or an organic EL (Organic Electro-Luminescence) display.

  The input unit 260 is, for example, a keyboard or mouse that receives an operation from a nursing staff, or a microphone that receives a voice input from the nursing staff. Further, the input unit 260 may be incorporated in the display unit 210. In this case, the display unit 210 is configured as a touch display that receives a touch operation from a nursing staff.

  The care database 240 stores, for example, care data indicating a floor map of a facility, each room number, an identification number of each bed 300, a name of a caregiver assigned to each bed 300, and the like.

  The display control unit 220 transmits registration information indicating a warning range common to each biological information detection device 100 to each biological information detection device 100 via the display communication unit 250. Further, the display control unit 220 causes the display unit 210 to display a screen corresponding to the care data stored in the care database 240. The display control unit 220 receives the alert signal from the biological information detection apparatus 100 via the display communication unit 250 or when an operation by the care staff is accepted by the input unit 260, the alert signal or the care staff's Perform processing according to the operation. Then, the display control unit 220 causes the display unit 210 to display the result.

  FIG. 7 is a diagram showing the contents of warning range information stored in the warning range storage unit 140.

  The warning range information 140d includes a biometric value range (first warning range shown in FIG. 7) in which the state of the cared person is disturbed and the state of the cared person being abnormal, that is, getting out of bed. The range of the biometric value (second warning range shown in FIG. 7) is shown.

  The first warning range indicates a range where the pulse is 80 times / minute or more, a range where the breathing is 10 times / minute or less, and a range where the body movement is 5 times / minute or more.

  The second warning range indicates a range where the pulse is 10 times / minute or less, a range where the breath is 3 times / minute or less, and a range where the body movement is 0 times / minute. The second warning range also indicates a temporal condition. That is, the second warning range is that the biological value in the above range continues for 30 seconds or more for the pulse, the biological value in the above range continues for one minute or more for breathing, and the body movement is in the above range. The condition is that the biological value continues for 10 minutes or more. In the example illustrated in FIG. 7, only the second warning range indicates a temporal condition, but the first warning range may also indicate a temporal condition in the same manner as the second warning range. Good. In this case, the temporal condition of the first warning range may be different from the temporal condition of the second warning range.

  The alert determination unit 130 reads the warning range information 140d as described above from the warning range storage unit 140. When the alert determination unit 130 determines that the detected biological value of the cared person is within the first warning range, a first alert signal corresponding to the first warning range (hereinafter, a disturbing alert signal). Send). Furthermore, when the alert determination unit 130 determines that the biological value of the care recipient is within the second warning range, the alert determination unit 130 generates a second alert signal (hereinafter referred to as an abnormal alert signal) corresponding to the second warning range. Send.

  When the display control unit 220 of the display device 200 receives the disturbing alert signal from the biological information detecting device 100 via the display communication unit 250, the display control unit 220 notifies the first mode that the disturbing alert signal has been received. In addition, when the display control unit 220 receives an abnormality alert signal from the biological information detection apparatus 100 via the display communication unit 250, the display control unit 220 notifies that the abnormality alert signal has been received in a second mode different from the first mode. To do. Specifically, the display control unit 220 displays a yellow image on the display unit 210 when informing in the first mode, and displays a red image in the display unit when informing in the second mode. 210 is displayed. These specific display methods will be described later.

  As described above, in the present embodiment, by using the first and second warning ranges, it is possible to appropriately determine the state of the care recipient on the bed 300 from the detected pulse, respiration, and body movement. Can do. That is, the cared person on the bed 300 is in a normal state, in a disturbing state (for example, in a state where the pulse is low, in a state where the breathing is rough, or in a state where there is a lot of body movement), or in a state where he / she is getting out of bed Can be appropriately determined.

  FIG. 8 is a sequence diagram illustrating processing performed between the biological information detection device 100 and the display device 200.

  First, the display device 200 registers a first warning range, that is, a threshold value for defining restlessness, and a second warning range, that is, a threshold value for defining abnormality, in the biological information detection device 100 (step). S11). This registration is performed when the display device 200 transmits the above-described registration information to the biological information detection device 100. Next, when the biological information detection device 100 determines that the detected biological value is within the first warning range or the second warning range, the biological information detection device 100 transmits an alert signal that informs the display device 200 of an unrest or abnormality (step). S12).

  Next, the display device 200 transmits a transmission command for urging transmission of biological information to the biological information detecting device 100 in response to an operation by the care staff (step S13). When receiving the transmission command, the biological information detection device 100 transmits the biological information to the display device 200 (step S14).

  FIG. 9 is a flowchart showing the processing operation of the biological information detection apparatus 100.

  First, when receiving the registration information from the display device 200, the biological information detection apparatus 100 stores the registration information in the warning range storage unit 140 as warning range information 140d, thereby the first and second information indicated by the registration information. The warning range is registered (step S101). Next, the biological information detection apparatus 100 detects the biological value of the care recipient (step S103), and determines whether or not the biological value is within the first or second warning range (step S105). Here, if it determines with it being in any warning range (Y of step S105), the biometric information detection apparatus 100 will transmit an alert signal to the display apparatus 200 (step S107).

  Next, the biological information detection apparatus 100 determines whether or not a biological information transmission command has been received (step S109). If it is determined that a transmission command has been received (Y in step S109), the biological information detection device 100 transmits biological information indicating the detected biological value to the display device 200 (step S111).

  FIG. 10 is a flowchart showing the processing operation of the display device 200.

  First, the display device 200 transmits registration information indicating a warning range (specifically, first and second warning ranges) common to each biological information detection device 100 to each biological information detection device 100. That is, the display control unit 220 registers a common range as a warning range for the plurality of biological information detection devices 100 by communicating with the plurality of biological information detection devices 100 via the display communication unit 250.

  Next, the display device 200 displays a screen based on the care data stored in the care database 240 (step S203).

  Next, the display device 200 determines whether an alert signal has been received from any of the biological information detection devices 100 (step S205). When the display device 200 determines that the alert signal has been received (Y in step S205), the alert signal is received by presenting the identification number of the bed 300 or the name of the care recipient corresponding to the alert signal. This is notified (step S207). At this time, the display device 200 may notify that the alert signal has been received by, for example, light output by an LED (Light Emitting Diode) or the like, image display, or sound output.

  Next, the display device 200 determines whether or not an instruction to display a biological value has been received by the care staff operating the input unit 260 (step S209). Here, when it is determined that it has been accepted (Y in step S209), the display device 200 transmits a biometric information transmission command to the biometric information detection device 100 (step S211), and from the biometric information detection device 100 according to the transmission command. The transmitted biological information is received (step S213). And the display apparatus 200 displays the biometric value shown by the biometric information (step S215).

  As described above, in the biological information detection system 1 in the present embodiment, a common warning range is registered in each biological information detection device 100 by the display device 200. Therefore, the convenience of the nursing staff in the facility can be improved. That is, the warning range can be registered uniformly in the entire facility, and the troublesomeness of registering the warning range of each care recipient can be reduced.

  Furthermore, in the present embodiment, when the transmission command is transmitted from the display device 200 to the biological information detection device 100 without always transmitting the biological information from each biological information detection device 100, the transmission command is received. The biological information is transmitted only from the biological information detecting apparatus 100. Therefore, it is possible to suppress the data amount or traffic of the overall information transmitted from each biological information detection device 100 to the display device 200 in the facility. As a result, communication control is simplified and the data communication speed and accuracy can be improved. Furthermore, since the data amount of information to be processed is reduced in the display device 200 and devices necessary for the PLC, the configuration of the display device 200 and the devices can be simplified, and the cost can be reduced. it can.

  FIG. 11A is a diagram illustrating an example of a screen displayed by the display device 200.

  The display device 200 displays a rectangular image a1 schematically showing each of the plurality of beds 300 or the plurality of rooms based on the care data. For example, when one bed 300 is installed in each room in the facility and the biological information detecting device 100 is attached to each bed 300, the rectangular image a1 schematically shows the room. In this case, the rectangular image a1 shows the identification number of the room corresponding to the rectangular image a1 and the surname of the cared person assigned to the room. The rectangular image a1 may schematically show the bed 300. In this case, the rectangular image a1 shows the identification number of the bed 300 corresponding to the rectangular image a1 and the surname of the care recipient assigned to the bed 300.

  When the display device 200 receives the alert signal, the display device 200 changes the color of the rectangular image a1 corresponding to the room or bed 300 where the biological information detection device 100 that has transmitted the alert signal is different from the color of the other rectangular image a1. Informing that the alert signal has been received. For example, when the display device 200 receives an alert signal from the biological information detecting device 100 of the bed 300 having the identification number “204” and the last name “Mr. Sato”, the color of the rectangular image a1 to which the identification number “204” is attached. From blue to yellow or red. In other words, the display control unit 220 of the display device 200 displays, for example, a blue rectangular image a1 on the display unit 210 when no alert signal is received. Here, when the display control unit 220 receives the disturb alert signal, the display control unit 220 changes the color of the displayed rectangular image a1 to yellow. Further, when receiving the abnormality alert signal, the display control unit 220 changes the color of the displayed rectangular image a1 to red. It is notified that the alert signal has been received by such a color change.

  Here, when such notification is performed, the care staff selects the rectangular image a1 assigned with the identification number “204” by operating the input unit 260. Thereby, the biological information detection apparatus 100 attached to the bed 300 with the identification number “204” is designated. When the display device 200 receives the designation, the display device 200 transmits a biological information transmission command to the biological information detection device 100.

  FIG. 11B is a diagram illustrating an example of a screen displayed by the display device 200 after transmission of a transmission command.

  When receiving the latest biological information from the biological information detecting device 100 as a result of transmitting the transmission command as described above, the display device 200 displays a biological window a10 indicating the state of the biological body as shown in FIG. 11B. The display device 200 displays a biological window a10 below the list of rectangular images a1 in distinction from the list.

  Here, the biological information indicates biological values such as the heart rate per minute, the respiratory rate, and the number of body movements as the state of the living body. The display device 200 displays the heart rate and respiratory rate per minute indicated in the biological information in the biological window a10. In addition, the display device 200 does not display the number of body movements per minute indicated in the biological information as a number, and the state of body movements, that is, the number of body movements per minute is normal or disturbing. Or abnormal. In the example of FIG. 11B, the heart-shaped mark a11 indicates that the numerical value on the right side of the mark a11 is a heart rate, and the round mark a12 indicates the numerical value on the right side of the mark a12 is a respiration rate. It shows that. The humanoid mark a13 indicates that “normal”, “restless” or “abnormal” on the right side of the mark a13 is a state of body movement. Further, the display device 200 displays a button a14 described as “view yesterday's data” in the biological window a10. When the button a14 is selected, the display device 200 displays yesterday's biological value or state detected by the biological information detecting device 100 attached to the bed 300 having the identification number “204”.

  Thus, in this embodiment, as shown in FIG. 11B, since the biological window a10 is displayed separately from the list of the rectangular images a1, the current state of the cared person indicated by the biological information is indicated to the care staff. It can be presented in an easy-to-understand manner.

  FIG. 12A is a diagram illustrating another example of a screen displayed by the display device 200. FIG.

  The display device 200 may display a map for each floor of the facility based on the care data instead of the screen shown in FIG. 12A. For example, the display device 200 displays the floor selection part a2 at the upper left corner of the screen, and when any floor (for example, the second floor) displayed in the selection part a2 is selected, the floor of the floor of that floor is selected. Display the map. In this map, the room number is assigned to each room. For example, when one bed 300 is installed for each room in the facility, the biological information detection device 100 attached to each bed 300 is identified by the room number.

  When the display device 200 receives the alert signal, the display device 200 changes the color of the room of the bed 300 to which the biological information detecting device 100 that transmitted the alert signal is attached to a color different from that of the other rooms on the map. Notify that the alert signal has been received. For example, when receiving an alert signal from the biological information detecting apparatus 100 of the room with the room number “205”, the display device 200 changes the color of the room with the room number “205” on the map.

  Here, when such notification is performed, the care staff operates the input unit 260 to select a room on the map to which the room number “205” is attached. Thereby, the biological information detection apparatus 100 attached to the bed 300 of the room with the room number “205” is designated. When the display device 200 receives the designation, the display device 200 transmits a biological information transmission command to the biological information detection device 100.

  FIG. 12B is a diagram illustrating another example of a screen displayed by the display device 200 after transmission of a transmission command.

  When the display apparatus 200 receives the biological information from the biological information detection apparatus 100 as a result of transmitting the transmission command as described above, the display apparatus 200 displays a biological window a20 indicating the state of the biological body as shown in FIG. 12B. The display device 200 superimposes the biological window 20 on the floor map at the center of the screen. The display device 200 displays the same content as the biological window 10 shown in FIG. 11B on the biological window 20, and also displays the biological value and state detected yesterday.

  Thus, in the example shown in FIG. 12A and FIG. 12B, since the map of the floor is displayed for each floor, the position of the room where the bed 300 to which the biological information detecting device 100 is attached is placed on the care staff. It is possible to notify clearly.

  Moreover, in this Embodiment, as shown to FIG. 11A and FIG. 12A, it is displayed on the display apparatus 200 whether a cared person's state is unrest or abnormality, or other states (henceforth calmness). It is notified by the color of the image of the caregiver's bed 300 or room. Thereby, it is possible to inform the care staff of the state of the care recipient in an easy-to-understand manner.

  Furthermore, in the present embodiment, when a rectangular image a1 or a room on the map is designated, the content of biological information transmitted from the biological information detecting device 100 corresponding to the rectangular image a1 or the room is displayed on the display device 200. Is done. Thereby, the nursing staff can observe the biological information of each cared person in each room at a nursing station or the like.

  In addition, each biological information detection apparatus 100 may transmit biological information regularly irrespective of reception of a transmission command. In this case, the display device 200 displays the state of the living body detected by each living body information detection device 100 as needed.

  FIG. 13A is a diagram illustrating another example of a screen displayed by the display device 200.

  The display device 200 displays a rectangular image a3 schematically showing each of the plurality of beds 300 or the plurality of rooms based on the care data. For example, when one bed 300 is installed in each room in the facility and the biological information detecting device 100 is attached to each bed 300, the rectangular image a3 schematically shows the room. In this case, the rectangular image a3 shows the identification number of the room corresponding to the rectangular image a1. The rectangular image a1 may schematically show the bed 300. In this case, the rectangular image a1 indicates the identification number of the bed 300 corresponding to the rectangular image a1.

  Further, in this rectangular image a3, the current state of the cared person detected by the biological information detecting device 100 in the bed 300 or the room corresponding to the rectangular image a3 is shown. Furthermore, the display device 200 displays the current date and time a4 on the upper left corner of the screen. Thereby, it is possible to easily grasp when the status of the cared person being displayed is. Further, the display device 200 displays a notification window a30. In this notification window a30, the status of the cared person is displayed for each cared person who is regarded as disturbing or abnormal.

  In addition, the display device 200 displays a rectangular image a3 (for example, rectangular images a3 having identification numbers “301”, “401”, and “406”) in which the biometric value within the first warning range is displayed in yellow. To do. In addition, the display device 200 displays a rectangular image a3 (for example, a rectangular image a3 with an identification number “205”) showing a biometric value within the second warning range in red. In addition, the display device 200 displays a rectangular image a3 (for example, a rectangular image a3 with the identification number “101”) in which the biological value not included in any of the first and second warning ranges is displayed in blue. . Thereby, even if unrest or abnormality is detected at a time by the plurality of biological information detection devices 100, the care staff can easily know their detailed states.

  In the example shown in FIG. 13A, the care staff recognizes at a glance the statuses such as the pulse rate and respiration rate of the care receiver detected by all the biological information detection devices 100 without individually specifying the rectangular images a3. Can be made. Further, since the status such as the identification number of the room or bed 300 and the pulse rate of each of the care recipients detected as not being calm is displayed in the notification window a30, attention is given to which care recipient. It can inform the nursing staff of the necessity. Moreover, in this notification window a30, the status of the cared person may be displayed in order from the cared person with the highest degree of urgency. Thereby, it is possible to easily inform the care staff of the care recipient who has a high degree of urgency. Moreover, in this notification window a30, those states may be displayed from the oldest when the disturbing state or abnormal state is detected.

  Here, the care staff operates the input unit 260 to select the rectangular image a3 to which the identification number “205” is attached. As a result, the biological information detection apparatus 100 in the bed 300 or room with the identification number “205” is designated. When receiving the designation, the display device 200 displays the biological window a20.

  FIG. 13B is a diagram showing another example of a screen including a biological window a20 displayed by the display device 200.

  The display device 200 displays the living body window 20 indicating the state of the living body detected by the living body information detecting device 100 attached to the bed 300 having the identification number “205” designated by the care staff. At this time, as described above, the display device 200 displays the currently detected biological value and state, and also displays the biological value and state detected yesterday on the biological window 20.

  Next, the detection unit 110 of the biological information detection apparatus 100 in the present embodiment will be described in detail.

  FIG. 14 is a block diagram illustrating a configuration of the detection unit 110 in the present embodiment.

  The detection unit 110 includes a transmission antenna 111t, a reception antenna 111r, amplifiers 112t and 112r, a local oscillator 113, a mixer 114, an AGC (Automatic Gain Control) circuit 115, a bandpass filter 116, an A / D converter 117, a signal analysis unit 118, And an output unit 119.

  The local oscillator 113 outputs an electrical signal having a predetermined frequency. Hereinafter, the frequency is referred to as a transmission frequency, and the electrical signal is referred to as a transmission signal. The amplifier 112t amplifies the transmission signal from the local oscillator 113. The transmission antenna 111t is, for example, a patch antenna, and transmits a radio wave such as a microwave having a transmission frequency as a transmission wave to the living body via the mattress 400 based on the amplified transmission signal. The transmitted wave is applied to the living body and reflected. Due to this reflection, a reflected wave is transmitted toward the receiving antenna 111r. The frequency of the reflected wave is equal to the transmission frequency if there is no movement in the living body, and the frequency according to the movement if there is movement in the living body. Hereinafter, the frequency of the reflected wave is referred to as a reflected frequency.

  The receiving antenna 111r is, for example, a patch antenna, receives the above-described reflected wave, and outputs an electrical signal corresponding to the reflected wave (hereinafter referred to as a received signal). The amplifier 112r amplifies the reception signal from the reception antenna 111r and outputs the amplified signal to the mixer 114. The mixer 114 mixes the reception signal and the transmission signal. That is, the mixer 114 generates a Doppler signal corresponding to the state of the living body by extracting a signal having a frequency difference between the transmission frequency and the reception frequency. Further, the mixer 114 outputs an in-phase component (hereinafter referred to as I signal) of the Doppler signal and a quadrature component (hereinafter referred to as Q signal) of the Doppler signal.

  In the present embodiment, a unit including transmission antenna 111t, reception antenna 111r, amplifiers 112t and 112r, local oscillator 113, and mixer 114 implements signal generation unit 120. That is, the signal generation unit 120 transmits a radio wave to a living body, receives a reflected wave of the radio wave, and extracts a signal having a frequency difference between the frequency of the transmitted radio wave and the frequency of the received reflected wave, A Doppler signal corresponding to the state of the living body is generated.

  The AGC circuit 115 automatically adjusts the gains of the I signal and Q signal output from the mixer 114. Specifically, the AGC circuit 115 adjusts the gains of the I and Q signals with a time constant of, for example, several seconds so that the signal levels of the generated I and Q signals are adjusted to a predetermined signal level. Control.

  The band pass filter 116 limits the frequency band of each of the I signal and the Q signal output from the AGC circuit 115 to a predetermined band.

  The A / D converter 117 samples the band-limited I signal and Q signal at a sampling rate that is twice or more the frequency of those signals, thereby converting each digital signal of the I signal and Q signal to an I digital signal. And Q as a digital signal.

  The signal analysis unit 118 performs a time-frequency analysis by continuous wavelet transform on the I digital signal and the Q digital signal, thereby generating a scalogram showing the frequency and intensity corresponding to the movement of the living body over time.

  In the scalogram generated by the signal analysis unit 118, the output unit 119 displays information based on the interval between the time point and the immediately preceding time point at each time point where the common characteristic frequency and intensity appear. Is output as biometric information. This interval is, for example, the time taken for one breath or the time taken for one heartbeat. That is, the output unit 119 outputs, for example, the respiration rate per minute or the heart rate per minute as biological information based on the interval.

  FIG. 15 is a block diagram showing a configuration of the signal analysis unit 118 in the present embodiment.

  The signal analysis unit 118 includes wavelet transform units 121i and 121q, square operation units 122i and 122q, and an adder 123.

  The wavelet transform unit 121i performs continuous wavelet transform on the I digital signal. The square calculation unit 122i outputs the square value of each converted value by squaring each converted value obtained by the continuous wavelet transform. Similarly, the wavelet transform unit 121q performs continuous wavelet transform on the Q digital signal. The square calculator 122q outputs the square value of each converted value by squaring each converted value obtained by the continuous wavelet transform.

  The continuous wavelet transform performed by the wavelet transform units 121i and 121q on the input waveform f (x) of the I digital signal or the Q digital signal is defined by the following (Equation 1).

  Here, x is time, a is a scale, and b is a translation (amount of translation). Further, φ (x) is a mother wavelet, for example, a Mexican hat function defined by (Equation 2) below.

  The adder 123 generates the above-described scalogram by adding the square value output from the square calculation unit 122i and the square value output from the square calculation unit 122q.

  FIG. 16A is a diagram illustrating a scalogram generated by continuous wavelet transform using a Mexican hat function.

  In this scalogram, the vertical axis indicates the frequency [Hz], the horizontal axis indicates time [seconds], and the shading indicates the power of the signal component. A portion having a high power in a frequency band of 0.8 Hz to 2.5 Hz corresponds to “sucking” or “voking” of breathing of the living body.

  In this scalogram, the output unit 119 specifies the time interval between the peak and the next peak, which is a strong portion of the above-described band, as the time taken for one action of respiration. And the output part 119 calculates the respiration rate per minute when the above-mentioned next peak appears based on this time interval.

  Note that the scalogram output in this way varies depending on the position of the biological information detecting apparatus 100 and the living body. The scalogram shown in FIG. 16A is obtained when the biological information detection apparatus 100 is at the position e shown in FIG. 17A and the center of the cared person's chest is at the position d. The position e is 90 cm away from the upper end in the length direction of the bed 300 toward the lower end side, and is at the center in the width direction of the bed 300. The position d is at a position 15 cm away from the living body information detection apparatus 100 on the right side.

  Here, instead of the Mexican hat function, a Gabor function may be used for the mother wavelet of the continuous wavelet transform.

  FIG. 16B is a diagram illustrating a scalogram generated by continuous wavelet transform using a Gabor function.

  Also in this scalogram, the vertical axis indicates the frequency [Hz], the horizontal axis indicates the time [second], and the shading indicates the power of the signal component. A portion having a high power in a frequency band of 0.8 Hz to 2.5 Hz corresponds to “sucking” or “voking” of breathing of the living body. Further, the strong part in the high frequency band corresponds to the heartbeat.

  In this scalogram, the output unit 119 sets the time interval between the peak, which is a strong part of the power in the high frequency band, and the next peak (that is, the interval between the R wave of the heartbeat and the next R wave) once for the heartbeat. Identifies the time taken for the action Then, the output unit 119 calculates the heart rate per minute when the above-described next peak appears based on this time interval. The output unit 119 may calculate the heartbeat as a pulse.

  As described above, in the biological information detection apparatus 100 according to the present embodiment, information based on the interval between the peak and the immediately preceding peak is output as biological information at each time point when the peak appears. Information can be obtained in real time.

  Moreover, the biological information detection apparatus 100 in the present embodiment is attached under the bottom 310 as described above. Further, when the cared person on the bottom 310 moves, the movement is transmitted to the bottom 310, and the bottom 310 also moves. Further, the bottom 310 reflects at least a part of the radio wave from the biological information detection apparatus 100. Therefore, the biological information detection apparatus 100 according to the present embodiment detects not only the movement of the cared person who is the living body but also the movement of the bottom 310. In other words, the biological information detection apparatus 100 according to the present embodiment not only directly detects the movement of the living body but also indirectly detects it.

  As a result, in the present embodiment, the movement of the living body, that is, respiration, heartbeat, and body movement can be detected with higher accuracy in real time. Thus, in this Embodiment, since the space | interval of respiration is detected in real time, based on the detection result, it can be judged that a care receiver has sleep apnea syndrome, for example. Alternatively, since the heartbeat interval (that is, the interval between the R wave and the R wave) is detected in real time, it can be determined that the cared person has an arrhythmia based on the detection result. In this way, the physical condition of the care recipient can be appropriately managed.

  Moreover, in biological information detection apparatus 100 in the present embodiment, the phase difference between the I signal and the Q signal is not detected. When the movement of a living body is directly detected, it can be determined whether the movement is approaching or separating from the phase difference between the I signal and the Q signal. That is, when the phase of the I signal is 90 degrees ahead of the phase of the Q signal, it can be determined that the living body is approaching, and the phase of the I signal is 90 degrees behind the phase of the Q signal. If it is, it can be determined that the living body is separated. However, as described above, the living body information detection apparatus 100 according to the present embodiment indirectly detects the movement of the living body, and thus uses the relationship between the phase difference between the I signal and the Q signal as described above. I can't. Therefore, the biological information detection apparatus 100 according to the present embodiment performs the above-described continuous wavelet transform and square operation on the digital signals of the I signal and the Q signal without using the above-described phase difference relationship. ing.

  FIG. 17A is a diagram illustrating a positional relationship between the position of the living body and the biological information detecting apparatus 100.

  The position of the biological information detection device 100 is a position that is 90 cm away from the upper end in the length direction of the bed 300 toward the lower end side, as shown as the sensor position (position e) in FIG. In the center of the direction. The length direction of the bed 300 is a direction along the longitudinal direction of the bed 300. The upper end is one end in the length direction of the bed 300 (for example, the end on the head side of the cared person), and the lower end is the other end in the length direction (for example, the end on the foot side of the cared person). . Further, the width direction of the bed 300 is a direction perpendicular to the longitudinal direction of the bed 300.

  Here, even if the biological information detection apparatus 100 is at the sensor position described above, if the position of the center of the breast of the care recipient who is a living body is different, the I signal is different and the Q signal is different. For example, in each of the positions a to i shown in FIG. 17A, the I signal is different and the Q signal is also different.

  Note that the position a is at a position 45 cm away from the upper end in the longitudinal direction and 15 cm to the right in the width direction when viewed from the sensor position. The position b is located at a position 45 cm away from the upper end in the longitudinal direction and at the same position in the width direction as the sensor position. The position c is at a position 45 cm away from the upper end in the lengthwise lower side, and 15 cm to the left in the width direction when viewed from the sensor position. Further, the position d is at a position 90 cm away from the upper end in the lengthwise lower side and 15 cm to the right in the width direction when viewed from the sensor position. The position e is at a position 90 cm away from the upper end in the lengthwise lower side, and is at the same position in the width direction as the sensor position. That is, the position e is the same position as the sensor position in both the length direction and the width direction. The position f is 90 cm away from the upper end in the lengthwise lower side, and 15 cm to the left in the width direction when viewed from the sensor position. The position g is at a position 45 cm away from the lower end in the lengthwise upper side, and 15 cm to the right in the width direction when viewed from the sensor position. The position h is at a position 45 cm away from the lower end in the lengthwise upper side, and is at the same position in the width direction as the sensor position. The position i is at a position 45 cm away from the lower end in the lengthwise upper side and 15 cm to the left in the width direction when viewed from the sensor position.

  FIG. 17B is a diagram illustrating an I signal and a Q signal observed for each position of a living body. Specifically, the graphs shown in (a) to (i) of FIG. 17B indicate that the cared person goes to sleep such that the center of his / her chest coincides with each of the positions a to i shown in FIG. 17A. An example of each waveform of the I signal and the Q signal is shown. The I signal and the Q signal differ depending on various factors such as the posture, orientation, and weight of the cared person, but also vary depending on the position of the cared person as shown in FIG. 17B. Specifically, the I signal differs depending on which of the living body, that is, the position of the center of the cared person's chest is in the positions a to i, and the Q signal is also the position of the center of the cared person's breast. It differs depending on which of the positions a to i. Accordingly, the magnitude relationship and the phase relationship between the I signal and the Q signal change not only according to the above-described posture, orientation, and weight of the cared person, but also depending on the position of the cared person when sleeping. In addition, since the I signal and the Q signal are obtained indirectly, the movement of the living body cannot be determined based on the phase difference between the I signal and the Q signal. For example, at the positions a, b, and h, the phases of the I signal and the Q signal are substantially the same. At positions b and f, the amplitude of either the I signal or the Q signal is small. However, in biological information detection apparatus 100 in the present embodiment, the gains of the I signal and the Q signal are adjusted by AGC circuit 115, and the wavelet transform and the square operation are performed on these digital signals as described above. . Therefore, it is possible to accurately detect the state of the cared person without being affected by the position of the cared person as described above.

  As described above, the biological information detection system 1 according to the present embodiment is a system that detects the state of the care recipient, and includes the biological information detection device 100 and the display device 200. The biological information detection device 100 is attached to a portion of the bed 300 below the mattress 400, transmits a radio wave toward the upper side of the mattress 400, receives a reflected wave of the radio wave, and receives the reflected wave on the mattress 400. The state of the caregiver is detected based on the reflected wave. The display device 200 displays the status of the cared person detected by the biological information detection device 100.

  Thereby, since the biological information detection apparatus 100 is attached to the bed 300, even if the bed 300 is moved, the relative positional relationship between the biological information detection apparatus 100 and the care receiver on the bed 300 does not change. . Therefore, even if the bed 300 is moved, the state of the cared person can be accurately detected. Moreover, since the biological information detection apparatus 100 is attached to a portion of the bed 300 below the mattress 400, it is possible to prevent the care receiver from improperly moving the biological information detection apparatus 100. . As a result, it is possible to prevent the status of the care recipient from being suddenly no longer detected due to the movement of the biological information detection device 100.

  The bed 300 includes a bottom 310 on which the mattress 400 is placed and a frame 320 that supports the bottom 310. The biological information detection apparatus 100 is attached to a part of the frame 320 below the bottom 310.

  Thereby, even if it is a case where the mattress 400 shifts | deviates, the position shift of the biometric information detection apparatus 100 can be suppressed. As a result, the state of the care recipient can be detected more accurately. Moreover, it can further suppress that a care receiver moves the biological information detection apparatus 100 inappropriately.

  The biological information detection apparatus 100 receives the reflected wave of the above-described radio wave including the reflected wave from the bottom 310.

  Thereby, even if the bottom 310 is a material that is difficult to transmit radio waves, the movement of the cared person is transmitted to the bottom 310, and the reflected wave from the bottom 310 is received. It is possible to detect, and the detection accuracy can be improved.

  In addition, the biological information detection device 100 determines whether or not the detected biological value indicating the state of the cared person is within the warning range, and when determining that it is within the warning range, displays the alert signal on the display device 200. Send to. When the display device 200 receives the alert signal, the display device 200 notifies that the alert signal has been received by optical output, image display, or audio output.

  Thereby, since the alarm is issued when the biological value of the cared person is within the warning range, the burden of monitoring the cared person by the care staff can be reduced.

  The biological information detection system 1 includes a plurality of biological information detection devices 100. The display device 200 registers a common range as a warning range for the plurality of biological information detection devices 100 by communicating with the plurality of biological information detection devices 100. In this case, the plurality of biological information detection devices 100 determine whether or not there is a biological value within the common warning range registered by the display device 200.

  Thereby, it is not necessary to individually register a warning range for each biological information detection apparatus 100, and the burden on the care staff can be reduced.

  The warning range is composed of a first warning range and a second warning range. Therefore, when the biological information detection apparatus 100 determines that the biological value is within the first warning range, the biological information detection apparatus 100 transmits a first alert signal corresponding to the first warning range, and the biological value is within the second warning range. If it is determined that it is within the range, a second alert signal corresponding to the second warning range is transmitted. When the display device 200 receives the first alert signal, the display device 200 informs that the first alert signal has been received in the first mode, and receives the second alert signal that the second alert signal has been received. Are reported in a second mode different from the first mode.

  Thereby, since the alarm according to the condition of the care recipient is issued, the care staff can easily grasp the condition.

  In addition, the first warning range is a range of biological values in which the state of the living body is disturbed, and the second warning range is a range of biological values in which the living body is assumed to be getting out of bed.

  Thereby, the care staff can easily grasp whether the care recipient is in a state of rest or whether the care recipient is getting out of bed.

  Further, the display device 200 transmits a transmission command that prompts the biological information detection device 100 to transmit biological information. When receiving the transmission command, the biological information detection device 100 transmits biological information indicating the detected biological state to the display device 200.

  Thereby, since biometric information is transmitted according to a transmission command, compared with the case where biometric information is repeatedly transmitted with the short period from the biometric information detection apparatus 100, the data amount of the information transmitted can be suppressed. That is, traffic between the biological information detection device 100 and the display device 200 can be reduced.

  In addition, the biological information detection apparatus 100 detects at least one of the number of pulses, the number of breaths, and the number of body movements of the cared person as the cared person's state.

  Thereby, the nursing staff can grasp | ascertain a care receiver quantitatively.

  In addition, the biological information detection device 100 communicates with the display device 200 via the PCL. Thereby, the communication environment between the biological information detection device 100 and the display device 200 can be easily constructed.

  The biological information detection apparatus 100 according to the present embodiment is an apparatus that detects a state of a living body, and includes a signal generation unit 120, an A / D converter 117, a signal analysis unit 118, and an output unit 119. . The signal generator 120 transmits a radio wave to a care recipient, receives a reflected wave of the radio wave, and extracts a signal having a frequency difference between the frequency of the transmitted radio wave and the frequency of the received reflected wave, A Doppler signal corresponding to the condition of the care recipient is generated. The A / D converter 117 is a sampling unit that generates a digital signal by sampling the Doppler signal at a sampling rate that is twice or more the frequency of the Doppler signal. The signal analysis unit 118 performs a continuous wavelet transform on the digital signal, thereby generating a scalogram showing the frequency and intensity corresponding to the movement of the care recipient over time. In the generated scalogram, the output unit 119 displays information based on the interval between the time point and the immediately preceding time point at each time point where the common characteristic frequency and intensity appear, that is, when each peak appears. Output as biometric information.

  Thereby, since the biological information at that time is output when each peak in the scalogram appears, accurate biological information can be obtained in real time. As a result, the state of the care recipient can be accurately detected.

  The biological information detection apparatus 100 further includes an AGC circuit 115 that controls the gain of the Doppler signal so that the signal level of the generated Doppler signal is adjusted to a predetermined signal level. The A / D converter 117 samples the Doppler signal adjusted to the predetermined signal level.

  Thereby, even if it is a case where the intensity | strength of a reflected wave is weak, a cared person's state can be detected accurately. In other words, it is possible to accurately detect the position of the care receiver at any position on the bed 300.

  Further, the signal analysis unit 118 performs wavelet transform on the digital signals of the in-phase component and the quadrature component of the Doppler signal, and generates a scalogram by synthesizing two signals generated by the wavelet transform.

  As a result, the state of the cared person can be detected regardless of the phases of the I signal and the Q signal, so that the condition is not only based on the direct reflected wave from the living body but also on the indirectly reflected wave. The state of the caregiver can be detected. As a result, the state of the care recipient can be detected more accurately.

  The bed 300 in the present embodiment may include a bottom 310, a frame 320, and the biological information detection device 100.

  The biological information detection apparatus, biological information detection system, and bed according to the present invention have been described based on the embodiments. However, the present invention is not limited to the embodiments. Without departing from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and other forms constructed by arbitrarily combining some components in the embodiments and modifications are also possible. Are included within the scope of the present invention.

  For example, in the above embodiment, the wavelet transform units 121i and 121q perform continuous wavelet transform, but may perform discrete wavelet transform. Also in this case, the same effect as the above embodiment can be obtained. In the above embodiment, the biological information detection apparatus 100 is attached to the frame 320, but may be attached to the bottom 310. Also in this case, the same effect as the above embodiment can be obtained.

  In addition, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Biological information detection system 100 Biological information detection apparatus 115 AGC circuit (amplification part)
117 A / D converter (sampling unit)
118 Signal Analysis Unit 119 Output Unit 120 Signal Generation Unit 200 Display Device 300 Bed 310 Bottom 320 Frame

Claims (8)

A biological information detection system for detecting a biological state,
Each of the plurality of beds is attached to a portion below the mattress, transmits a radio wave toward the upper side of the mattress, receives a reflected wave of the radio wave, and indicates the state of the living body on the mattress. A biological information detection device for detecting based on the reflected wave;
For each of a plurality of the living body information detection apparatus includes a display device and which displays the state of the living body is detected by the living body information detection apparatus,
Each of the plurality of biological information detection devices includes:
It is determined whether or not the detected biological value indicating the state of the living body is within the common warning range registered by the display device. When it is determined that the biological value is within the common warning range, an alert signal is output. Transmitted to the display device,
The display device
Registering a common range as the common warning range for the plurality of biological information detection devices by communicating with the plurality of biological information detection devices,
When the alert signal is received, the alert signal is notified by light output, image display or audio output,
Biological information detection system. Each of the plurality of beds includes a bottom on which the mattress is placed, and a frame that supports the bottom,
The biological information detection system according to claim 1, wherein each of the plurality of biological information detection devices is attached to a part of the frame below the bottom. The biological information detection system according to claim 2, wherein each of the plurality of biological information detection devices receives a reflected wave of the radio wave including a reflected wave from the bottom. The common warning range includes a first warning range and a second warning range,
Each of the plurality of biological information detection devices transmits a first alert signal corresponding to the first warning range when it is determined that the biological value is within the first warning range, and the biological value Is determined to be within the second warning range, a second alert signal corresponding to the second warning range is transmitted,
When the display device receives the first alert signal, the display device informs that the first alert signal has been received in the first mode, and receives the second alert signal, the second alert signal is received. The biological information detection system according to any one of claims 1 to 3 , wherein the second information is notified in a second aspect different from the first aspect. The first warning range is a range of biological values in which the state of the biological body is disturbed,
The biological information detection system according to claim 4 , wherein the second warning range is a biological value range in which the living body is assumed to be getting out of bed. The display device transmits a transmission command for urging transmission of biological information to the plurality of biological information detection devices,
Each of the plurality of the biological information detection apparatus, the transmission when an instruction has been received, the described the biological information indicating the state of said detected biometric to any one of claim 1 to 5 for transmitting to said display device Biological information detection system. Each of the plurality of the living body information detection apparatus, the number of the pulse of the living body, any one of claims 1 to 6 for detecting the number of breaths, and at least one of the number of body movement as the state of the living body 1 The biological information detection system according to item. Biological information detecting system according to any one of claim 1 to 7, respectively, for communicating with the display device via the power line communication of the plurality of living body information detection apparatus.