JP3387472B2 - Human body detection device and bed provided with the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting the presence or absence of a person on a bed.

[0002]

2. Description of the Related Art In hospitals, nursing homes, homes with a care recipient, etc., for the safety of the sick person and the care recipient, the sick person and the care recipient on the bed can be used even when the caregiver is not nearby. There is a need for a way to know if there are any abnormalities in the animals and if they are not out of bed. It is possible to use an infrared pyroelectric sensor or a mat sensor for this purpose.

Human body detection using an infrared pyroelectric sensor is shown in FIG. In the figure, a is a bed, b is a pyroelectric sensor attached to the ceiling, and p is a human body lying on the bed. In such a human body detection device, the pyroelectric sensor b receives infrared rays from the human body p lying on the bed to detect the human body.

Human body detection using a mat sensor is shown in FIG. In the figure, a is a bed, d is a mat sensor located on the bed, and p is a human body lying on the bed. In such a human body detection device, the mat sensor d is laid under the lying human body p, and the change in the pressure inside the mat is used, that is, the human body load is used to enclose air or the like in a bag or the like. The human body was detected by measuring the load pressure of the human body.

In another mat sensor, a mechanical sensor is arranged on the mat to detect the human body by detecting the opening and closing of the electrical contact due to the load of the human body.

[0006]

However, since the above-mentioned pyroelectric sensor for detecting infrared rays has a differential output, a moving human body can be detected, but a stationary human body cannot be detected. Further, there is a malfunction such as detecting a small animal such as a pet or a heat source other than the human body. Furthermore, it blocks infrared rays between the human body to be detected and the sensor,
If there is a futon or blanket, it may become undetectable or cause malfunction.

Further, the sensor using the opening and closing of the electrical contact due to the load of the human body has the drawbacks that the contact part is broken due to repeated load and that the threshold load is not easily set.

Further, in the mat sensor for detecting the pressure in which the air bag is filled with air by utilizing the load of the human body, the mat sensor is placed under the sheet under the human body, which makes the person using the bed feel uncomfortable. In addition to making it feel, the mat is a material that is impermeable to air, such as rubber and vinyl, which causes stuffiness, which is a health problem.

The present invention has been made by paying attention to the above-mentioned problems, and an object thereof is to reliably detect a sick person or a person requiring care on a bed, and further, to obtain the sick person or the need for care. It is an object of the present invention to provide a human body detection device that does not cause a person to feel uncomfortable and has no adverse health effects.

[0010]

A human body detecting apparatus according to the present invention has an impulse radar that transmits an impulse-shaped electromagnetic wave and receives a reflected wave from the human body, and detects the human body from the state of the reflected wave. An apparatus for detecting a human body, which is provided in a bed and transmits an electromagnetic wave to a range including all or a part of a region where the human body on the bed can normally exist to detect the human body.

Here, "impulse radar" means, for example, U.S.P. MI disclosed in SPAT 5,457,394
R (Micropower Impulse Rada
(abbreviation of r), etc., and impulse electromagnetic waves transmitted and received by the impulse radar are timber, cloth,
It is permeable to cotton, plastic, resin, etc., but has a property of being easily reflected by those containing a large amount of water such as the human body.

"Bed" means various types of beds including a nursing bed, an adult or child bed, and a bed for general household use, and is mainly composed of a bed housing and a mat placed on the bed housing. .

The "region in which the human body can normally exist" means a position which is supposed to normally exist when a sick person or a person requiring care is lying on the bed.

According to this structure, the human body detecting device can reliably detect the human body by receiving the reflected wave from the human body when the sick person or the care recipient is lying on the bed. . Even if there is a mat or a futon between the human body and the human body detection device, they do not interfere with human body detection because they normally transmit electromagnetic waves. It does not give any discomfort to the sick or care recipient. Electromagnetic waves to be transmitted can have extremely weak power, and the spectrum thereof is spread over a wide range of frequencies, so that the electromagnetic waves to be transmitted have a very small effect on the human body and surrounding medical devices. Preferably, the electromagnetic waves are transmitted so as to include a region where the body portion is usually present rather than the foot or head portion of the human body. Then, the certainty of detection can be increased. It goes without saying that the human body is detected not only when the sick person or the care recipient is lying down, but also when the person is sitting on the bed if there is a part of the human body in the detection area of the impulse radar.

Preferably, the detection area of the impulse radar is limited to a predetermined range including all or part of the area where a human body on the bed can normally exist. “Limiting to a predetermined range” means limiting to a predetermined distance range, a predetermined angle range, or a range in which both are combined. For example, the range in which the spring inside the mat, the handrail for falling prevention, the table on the bed, the person or equipment on the bedside exists can be set as the impulse radar dead zone. The impulse radar dead zone can be realized by, for example, not outputting a detection output even if a wave is received if the required time from the transmission of the impulse radar to the reception is within the required time corresponding to the dead zone.

By the way, the mounting position of the impulse radar and its detection area can take various forms depending on the type of bed.

The impulse radar can be provided below the mat in the bed, since in most beds the mat is transparent to electromagnetic waves. In this case, the impulse radar is preferably located under the mat at the center of the bed. Then, the impulse radar can be set at the position closest to the human body to be detected. In addition, since there is a high probability that a human body is usually present in the center of the bed, detection becomes more reliable. Furthermore, the electromagnetic waves of the impulse radar can be made less susceptible to the influence of other electromagnetic wave reflecting objects.

The impulse radar can also be provided above the bed mat. Then, the human body can be detected even if the mat is made of a material that does not transmit electromagnetic waves. In this case, the impulse radar is preferably located on the top plate. It can also be installed at the bedside or near the human foot.

Also in this case, the detection range of the impulse radar is on the bed so that the spring inside the mat, the handrails for fall prevention, the table on the bed, the person on the bedside, the equipment, etc. will not detect the impulse radar. It is preferable to limit the range of the area where the human body can normally exist.

Further, the human body detecting apparatus according to the present invention can generate and transmit a signal indicating the presence or absence of the human body, and thereby the receiving side of the signal can remotely detect the presence or absence of the person on the bed. .

Further, the human body detecting apparatus according to the present invention has a plurality of impulse radars whose detection areas are different from each other, and a signal representing the operating state of the human body based on the state of the reflected wave received by each impulse radar. Can be generated and transmitted so that the receiver of the signal can remotely sense the condition of the person on the bed.

The signal indicating the presence or absence of the human body and the signal indicating the operating state of the human body may be transmitted by wire or wirelessly. The receiving side is assumed to be a remote supervisor or a nurse center in a hospital, and the presence or absence of a person on the bed can be remotely monitored at those locations.

Further, the bed according to the present invention is an impulse radar which transmits an impulse-shaped electromagnetic wave to a range including all or a part of a region where a human body on the bed can normally exist and receives a reflected wave from the human body. And a human body detection device for detecting the human body from the state of the reflected wave.

The human body detection system according to the present invention is
A human body detection device for generating and transmitting a signal indicating the presence or absence of the human body, and a receiving means for receiving a signal indicating the presence or absence of the human body and notifying when the state of the signal satisfies a predetermined condition Is.

The "predetermined condition" is, for example, a condition in which the presence of a person sleeping in a bed is detected, then the person leaves the bed, and does not return after a certain period of time. This fixed period of time is set in consideration of the medical condition of the person to be detected, walking ability, purpose of monitoring, and the like. "Reception means"
Is installed in a place where there is an observer, a nurse center, etc., and when a predetermined condition is satisfied, it gives a notification by voice or display. As a result, it is possible to perform monitoring for the purpose of knowing whether the user of the bed is wandering around, or is not getting down from the bed and falling down.

The human body detection system according to the present invention is
A human body detection device that generates and transmits a signal that represents the operating state of the human body, and a receiving unit that receives the signal that represents the operating state of the human body and that notifies when the signal state satisfies a predetermined condition. It is a thing.

The "predetermined condition" in this case is, for example,
Based on the state of the reflected wave received by the impulse radar, it detects the state of the position and orientation of the person sleeping on the bed, and if there is no change in the state for a certain period of time, it is assumed that something is wrong. Is.

That is, since a normal person performs an operation such as turning over even if he / she is sleeping within a certain fixed time, it is possible to set the fixed time in consideration of an average turning interval. These human body detection systems are for people requiring care,
It can also be used as a life rhythm sensor for the elderly living alone. If an elderly person living alone is not bedridden, the detection may be performed only at night, or the fixed time for notifying that the human body is not detected may be set long, for example, 24 hours.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, a first embodiment of the device of the present invention will be described. FIG. 1 is a partially cutaway perspective view showing a first embodiment of the device of the present invention, and FIG. 2 is an operation explanatory view of the first embodiment of the device of the present invention.

As shown in FIG. 1, this first embodiment is applied to a bed 1 in which an impulse radar 4 is arranged on the back surface of the bed. The bed housing 1a is made of metal or wood. The mat 1b is located on the bed housing 1a, and the impulse radar 4 is arranged on the bed housing 1a which is the back surface thereof. The mat 1b is covered with a fiber that allows a pulsed electromagnetic wave to easily pass through, and a spring is provided inside.

In this example, the bed casing 1a is framed by a metal plate or wood, and the impulse radar 4 is arranged so that the upper surface of the impulse radar 4 coincides with the central portion of the upper surface of the bed casing 1a on which the mat 1b is placed. It is attached. The mounting bracket 5 is a bracket for fixing the impulse radar 4 to the bed housing 1b. The other part of the human body detection device may be provided integrally with the impulse radar 4, or may be provided separately from the impulse radar 4 on the side surface of the bed that is easily operated from the outside, for example.

By mounting the impulse radar 4 in this manner, the care-requiring person and the sick person do not see the eyes, so that the feelings of those persons being monitored can be alleviated. The state of the impulse-like electromagnetic wave emitted from the impulse radar 4 behind the mat 1b is schematically shown in FIG.

As is apparent from the figure, the electromagnetic wave emitted from the impulse radar 4 passes through the mat 1b, the mattress 6 and the sheets, and is radiated toward the human body p existing there. Similarly, the electromagnetic wave reflected by the human body p passes through the sheet, the mattress 6 and the mat 1b and returns to the impulse radar 4.

As shown schematically in FIG. 2, the directivity angle of the electromagnetic wave emitted from the impulse radar 4 is sufficiently wide that it can be accurately detected even if the human body p moves to a wide range of positions on the mat 1b. , The detection area of the impulse radar 4 is set.

Next, a second embodiment of the device of the present invention will be described. FIG. 3 is a partially broken perspective view showing a second embodiment of the device of the present invention, and FIG. 4 is an operation explanatory view of the second embodiment of the device of the present invention.

As shown in FIG. 3, this second embodiment is applied to the bed 2 in which the impulse radar 4 is arranged on the bed top 2c. This type is a case where the mat 2b is a bed of a material covered with a metal or the like that does not transmit the pulsed electromagnetic waves of the impulse radar 4.

In this example, the bed housing 2b is framed with metal or wood, and the top plate portion 2c is wood. The human head is directed toward the top plate 2c. The impulse radar 4 is located inside the center of the top plate 2c and is attached toward the human head.

With such a bed 2, if the impulse radar 4 is mounted in this way, it will not be seen by the care recipient or the sick person, so that the feelings of those persons being monitored can be alleviated. it can.

The state of pulsed electromagnetic waves emitted from the impulse radar 4 which is hidden inside the top plate 2c is shown in FIG.
Is schematically shown.

As is apparent from the figure, the electromagnetic wave emitted from the impulse radar 4 passes through the top plate surface 2d and is irradiated toward the human body p existing on the bed. The electromagnetic wave reflected by the human body p similarly passes through the top plate surface 2d and returns to the impulse radar 4.

As shown schematically in FIG. 4, the directivity angle of the electromagnetic wave emitted from the impulse radar 4 is sufficiently wide that it can be accurately detected even if the human body p moves to a wide range of positions on the mat 1b. , The detection area of the impulse radar 4 is set.

Pillows 7 and upper futons are present on the mat 2b, but since a material through which electromagnetic waves emitted from the impulse radar 4 are transmitted is used, it does not participate in human body detection.

Next, a third embodiment of the device of the present invention will be described. FIG. 5 is a side view of the bed showing the third embodiment of the device of the present invention, and FIG. 6 is a plan view of the bed showing the third embodiment of the device of the present invention.

As shown in FIG. 5, this third embodiment is applied to the bed 3 of the mat 3b through which the impulse-shaped electromagnetic wave is transmitted. The mat 3b is provided with three impulse radars 4a, 4b, 4c on its back surface. The material of the mat 3b is covered with a fiber or the like that easily transmits pulsed electromagnetic waves, and a spring is provided inside.

On the mat 3b, the mattress 6 is provided, and further, the human body p such as a care recipient or a sick person is present thereon. In such a bed 3, the impulse radars 4a, 4b, 4c for detecting the presence / absence of the human body p are hidden behind the mat 3b so as not to be seen by those people. By mounting the impulse radars 4a, 4b, and 4c in this manner, the care-requiring person and the sick person do not see the eyes, and it is possible to alleviate their feelings of being monitored.

Impulse radar 4 behind the mat 3b
The state of pulsed electromagnetic waves emitted from a, 4b, and 4c is schematically shown in FIG.

As is clear from the figure, the electromagnetic waves emitted from the impulse radars 4a, 4b and 4c are the mat 3b.
Through the mattress 6 and is irradiated toward the human body p existing there. The electromagnetic waves reflected by the human body p similarly pass through the mattress 6 and the mat 3b and return to the impulse radars 4a, 4b and 4c.

As shown schematically in FIG. 5, the directivity angle of the electromagnetic waves emitted from the impulse radars 4a, 4b and 4c is sufficiently wide, and even if the human body p moves to a wide range of positions on the mat 3b. The detection areas of the impulse radars 4a, 4b, 4c are set so that they can be accurately detected.

Since the directivity angle of the impulse radar can be adjusted to a specific angle, the mat 3
The detection range of the human body can be limited by calculating the thickness of b.

Next, as shown in FIG. 6, the three impulse radars 4a, 4b and 4c are arranged on the mat at substantially equal intervals. Impulse radar 4
a is a shoulder, impulse radar 4b is a waist, and impulse radar 4c is a foot. Furthermore, the detection range of each impulse radar is 4a1, 4b1, 4c1,
It covers almost the entire area of the mat 3b.

As described above, by disposing a plurality of impulse radars, almost the entire area of the mat 3b is covered, and it is possible to detect where the human body moves on the mat. Further, the human body is not only in a recumbent state but also in various postures such as turning over, curling, and slanting. Therefore, it is for detecting even in such a state. A detailed description will be given later of the operation of detecting a change in the state of the human body, which takes advantage of the feature of arranging a plurality of impulse radars.

Next, an impulse radar that can be used in the first to third embodiments will be described. “Impulse radar” means, for example, U.S.P. SPAT 5,457,394
(Impulse Rader Studfinde
r), in which a pulsed electromagnetic wave is transmitted to the inspection target and the reflected wave is received, and the electromagnetic wave is transmitted by the transmitting / receiving means, and then the reflected wave is received. The radar device has a distance measuring unit that measures the distance to the inspection target based on the time until the inspection.

Impulse radar has the following advantages as compared with the conventional CW (continuous wave) type and pulse type radars. Since it does not require a modulation / demodulation circuit, it has a simple structure, is small and lightweight, consumes less power, and is inexpensive.

Since the transmission electromagnetic wave is pulsed, the transmission is completed in an extremely short time. Therefore, even if the inspection target exists at a short distance of 1 m or less and the reflected wave from it is immediately returned, Can be separated and extracted. That is, it is possible to detect a very short distance. The entire electrical hardware configuration of the impulse radar is schematically shown in FIG. As shown in the figure, in the impulse radar 100, the transmitter 10 that transmits a pulse of an electromagnetic wave having a frequency of 1 GHz or higher and the receiver 11 that receives a reflected wave of the electromagnetic wave are controlled by the transmitter 10. It includes a control unit 12 that measures the time and the amplitude and phase of each time that is the shape of the reflected wave itself until the reflected wave from the inspection target object is received after the pulsed electromagnetic wave is transmitted.

The details of the transmission / reception section and the control section of the impulse radar are shown in FIG. As shown in the figure,
The transmitter 10 and the receiver 11 are high-frequency circuits.

The transmitting section 10 includes a pulse generating section 10a for generating a pulse having a steep rising edge and a pulse generating section 10a.
And a transmitting antenna 10b that generates a pulsed electromagnetic wave based on the pulse output by the antenna.

The receiving unit 11 samples the sampling pulse generating unit 11a for generating sampling pulses and the sampling pulse level supplied from the sampling pulse generating unit 11a for sampling the level of the reflected wave received by the receiving antenna 11c. And a portion 11b.

The control unit 12 generates a clock having a frequency of 2 MHz and outputs it to the pulse generation unit 10a and the sampling pulse generation unit 11a.
It also includes a clock generation circuit 12a that generates a clock having a frequency of 0 Hz and outputs it to the sampling pulse generation unit 11a. The control unit 12 also includes the sampling unit 11
It includes a reception signal processing unit 12c that receives and holds the sample value supplied from b.

Next, the operation of transmitting and receiving electromagnetic waves will be described. The pulse generator 10a generates a pulse with a sharp rising edge in synchronization with the clock output from the clock generator 12a. The sharp falling pulse can be generated by turning on or off a transistor as a built-in switching element at high speed. Transmitting antenna 10b
When an impulse having a sharp fall is supplied from the pulse generator 10a, the pulse-shaped electromagnetic wave is transmitted in synchronization with the timing of the sharp fall. The transmitted pulsed electromagnetic wave is reflected by the electromagnetic wave reflecting object (reflection occurs when there is a discontinuity in the dielectric constant) 13, is received by the receiving antenna 11c, and the received signal is the sampling unit 11b.
Entered in.

Therefore, as shown in FIG.
When the transmitted wave (transmitted wave) is transmitted at the cycle of the reciprocal of the frequency of MHz, the reflected wave is received with a slight delay. Now, focusing only on this reflected wave (received wave), FIG. 9 (B)
The reflected wave as shown in is input to the sampling unit 11b.

The sampling pulse generator 11a generates a sampling pulse synchronized with the clock of 2 MHz frequency supplied from the clock generator 12a.
The phase of this sampling pulse is slightly shifted based on the frequency clock of 40 Hz supplied from the clock generation circuit 12b. As a result, as shown in FIG. 9B, it becomes possible to sample the levels at different positions of the received wave at the sampling timings (tA to tE).

Electromagnetic wave reflecting object 13 that reflects electromagnetic waves
Is considered to have not moved substantially within a short time, the waveform of the reflection (received wave) received at the reciprocal period of the frequency of 2 MHz shown in FIG. 9B is substantially the same. Conceivable. Therefore, by sampling these received waves while slightly changing the phase at the cycle of the reciprocal of the frequency of approximately 2 MHz, the level of one received wave that changes momentarily can be obtained.
It becomes possible to expand the time axis (in the low frequency region) and perform sampling.

In order to simply receive this one reflected wave and sample the value of the level that changes with time, a sampling clock having a frequency sufficiently higher than the frequency of 2 MHz is required. Such high frequency circuits are cumbersome to handle and costly. Therefore, by slightly shifting the phase of the sampling clock having a frequency of approximately 2 MHz in this way, in the example of 9 (B), the received wave is received at the timing from time tA to time tE without using a special high-frequency circuit. Will be sampled.

Therefore, the sampling pulse generator 11
a, 2M, as shown schematically in FIG.
A clock having a frequency of Hz is compared with the level of a clock having a frequency of 40 Hz, and a sampling pulse is generated at the timing when both are at the same level.

More specifically, the sampling pulse generator is, as shown in FIG. 11, a clock generator 12a.
A clock with a frequency of 2 MHz ((Fig. 1
1) (A)) and a clock of a sawtooth wave having a frequency of 40 Hz supplied from the clock generation circuit 12b (FIG. 11).
(See (B)) and are synthesized to generate a synthesized wave (see FIG. 11C).
To generate. The sampling pulse generator 11a compares this composite wave with a predetermined threshold value LT that is set in advance.

FIG. 12 shows a state in which the edge of the composite wave shown in FIG. 11C is enlarged. That is, 2 MH
The clock edge of z has a predetermined slope by combining with the clock of the frequency of 40 Hz. As a result, in the vicinity of the start point of the sawtooth wave, as shown in FIG. 11A, the rising edge of the rising edge of the clock of 2 MHz is used as the reference point, and the level of the edge is the threshold value LT.
Assuming that the time to reach T1 is T1, the time T2 from the reference point to the sampling point is the time T shown in FIG. 11A near the end point of the sawtooth wave, as shown in FIG. 11B.
It becomes longer than 1. Therefore, in the region between the start point of the sawtooth wave and the end point of the sawtooth wave, a sampling point occurs at a time between time T1 and time T2.

The sampling pulse generator 11a generates a sampling pulse at the timing of this sampling point and outputs it to the sampling unit 11b. The sampling unit 11b samples the reflection in synchronization with this sampling pulse and outputs the sampling value to the reception signal processing unit.

The operation of the received signal processor 12c is shown in the flowchart of FIG. The reception signal processing unit 12c calculates the distance to the target human body based on the difference in transmission / reception time of pulsed electromagnetic waves by executing the distance measurement processing (step 1301). That is, this distance measurement processing (step 13
In 01), the received waveform is low-frequency converted and detected based on the sample value arriving from the sampling unit 11b, and this is compared with the low-frequency waveform corresponding to the transmitted wave to obtain the distance data L corresponding to the transmission / reception time difference. To generate.

Next, the distance data L corresponding to the distance to the target object is set to the threshold values Lmin and Lmax corresponding to the near limit distance and the far limit distance of the detection area by executing the distance determination process (step 1302). When it is out of the range, the detection output is turned off.
When it falls within the range of Lmin and Lmax, the detection output is turned on.

Therefore, in the case of the first embodiment as shown in FIG. 2, for example, the upper surface of the mat is set to be closer to the near limit Lmin and the distance covering the assumed human body position is set to the far limit Lmax. If it is set so that malfunctions due to those noise components can be prevented.
Similarly, in the case of the third embodiment as well, by appropriately setting the near limit Lmin and the far limit Lmax, the detection reliability can be improved through the distance discriminating action.

Continuing on, if the second embodiment as shown in FIG. 3 is targeted, the distance from the top plate surface to the human head is assumed to be several cm, and this distance is set to be closer than the near limit Lmin. If the far limit Lmax that should cover approximately 50 cm to 80 cm is set in consideration of the movement of the human body, malfunction due to those noise components can be prevented.

As a typical application example of the detection devices of the first to third embodiments, in a hospital, a nursing home for the elderly, a home with a care recipient, etc., in order to ensure the safety of the sick person and the care recipient,
Even when there are no caregivers around, it is possible to know whether there are any abnormalities in the sick person on the bed or the care recipient, and whether or not the people are away from the bed. Examples include loitering monitoring that detects the presence of a sick person on the bed and the need for care, and sends a notification to the place where the watcher is, a nurse center, etc., and a notification device that notifies the watcher when sleeping for a certain time or longer. . An example of such a notification device will be described with reference to FIGS. 14 and 15.

As shown in FIG. 14, this notification device includes an impulse radar 100 mounted on a nursing bed and an impulse radar 1 as in the first to third embodiments.
A microcomputer 20 for executing state information processing of the human body based on the output of 00, a relay 23 driven by a transistor 22 at the output of a transmitter signal 20b,
It includes a transmitter antenna 27 and a power supply 25 which is supplied to a transmitter 26 via a contact 24 of a relay 23.

The microcomputer 20 has a processing unit 20a for executing the state information processing of the human body based on the output of the impulse radar 100, a transmitter signal unit 20b for outputting the presence / absence of the human body from the processing result, and a processing unit 20a. State signal generator 2 for generating and outputting a state signal from the processing result of
0c.

Next, the radio wave emitted from the transmitter antenna is reported to the nurse center as an example, and is centrally monitored by the receiving terminal.

The contents of the human body monitoring process are shown in FIG. In this example, it is determined that the human body is present on the care bed first, and then the human body is no longer present, and a notification is given and a transmitter output is performed.

That is, when the processing is started, transmission and reception are performed from the impulse radar, and it is repeatedly determined whether or not a human body is present (steps 1501 and 1502). In this state, when it is determined that the human body changes from being present to being absent (step 1502).
YES), the transmitter output is turned on. In this way, the human body is monitored.

Further, in the case of the third embodiment, it is not the information indicating the presence / absence of the human body, but several pieces of information such as status information, position information, and ON / OFF information of a plurality of impulse radars, and therefore transmission. The status signal section 21c is output in synchronization with the machine signal section 21b.

This status signal is sent to the transmitter as data having a plurality of information and is sent to the nurse center as data communication. In this way, the condition of the human body is monitored.

Operation state detection will be described as an application example of human body detection in the detection apparatus of the third embodiment. FIG. 16 shows an operation explanatory diagram for detecting a change in the state of the human body by taking advantage of the feature of disposing a plurality of impulse radars.

FIG. 16 (A) shows the posture of the human body p lying on the bed in the operating state.
Corresponding to the received waveforms of 4b and 4c respectively (A) 4a
The reflected wave of (A) 4b and the reflected wave of (A) 4c are shown. The vertical axis represents the voltage value of the waveform of these reflected waves, and the horizontal axis represents the passage of time.

Next, FIG. 16 (B) shows the posture in the operating state in which the human body p lying on the bed is about to get up.
The received waveforms of b and 4c are shown as a reflected wave of (B) 4a, a reflected wave of (B) 4b, and a reflected wave of (B) 4c, respectively. The vertical axis represents the voltage value of the waveform of these reflected waves, the horizontal axis represents the passage of time, the voltage of the reflected wave of (B) 4a is V1a, the reflected wave of (B) 4b is V2b, and the reflected wave of (B) 4b.
The reflected wave of c is V3b.

When the lying human body p is about to wake up, the waveform of the reflected wave of the impulse radar 4c is the same as the reflected wave of (A) 4c and (B) 4c because there is no change in the legs. The reflected waves of are the same. Impulse radar 4
Since the waveform of the reflected wave of b changes that the waist is lifted, the reflected wave of (A) 4b and the reflected wave of (B) 4b are V2
b becomes lower than V1b and changes with a time delay T3 to the peak value of the waveform.

Since the waveform of the reflected wave of the impulse radar 4a has a large rising portion of the head, the reflected wave of (A) 4a and the reflected wave of (B) 4a are considerably lower in V2a than V1a, There is a time delay T4 to the peak value of the waveform, which causes a large change.

That is, this change in time changes as the distance between each part of the human body from the impulse radar increases, the time for transmitting and receiving increases, and the time for the head increases for more time than the waist, resulting in a change in state. I understand.

As described above, by arranging a plurality of impulse radars, it was possible to detect the rising state. Although I explained the upright state above, it covers the whole area of the bed and moves not only when the human body is on the mat, but also when lying down, rolling over, curling, leaning, getting up, etc. The state can be detected by the same idea.

As the above-described application examples, for example, loitering monitoring that detects the presence and state of a person sleeping in a bed and sends a notification to a viewer or a nurse call when leaving the bed, or a change in the state for a certain period of time or more. If there is no such thing, a caregiver in bed or a life rhythm sensor that notifies the viewer that something is wrong with the sick person is included.

[0088]

As is apparent from the above description, the human body detecting apparatus of the present invention and the bed equipped with the human body detecting apparatus can surely detect the sick person and the care recipient on the bed, and further, the sick person and the care recipient. It is possible to provide a human body detection device that does not cause a person to feel uncomfortable and has no adverse health effects.

Further, the bed human body detecting apparatus of the present invention is
It can detect a human body containing a lot of water selectively and is less sensitive to objects other than the human body such as pillows, duvets, blankets and small items on the bed, so it can detect the human body more reliably and prevent false detections. it can. Furthermore, since the bed human body detection device of the present invention can arbitrarily set the detection distance range,
It is possible to set the optimum detection target range according to the installation location of the impulse radar.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a device of the present invention.

FIG. 2 is an operation explanatory view of the first embodiment of the device of the present invention.

FIG. 3 is a partially cutaway perspective view showing a second embodiment of the device of the present invention.

FIG. 4 is an operation explanatory view of the second embodiment of the device of the present invention.

FIG. 5 is a side view of a bed showing a third embodiment of the device of the present invention.

FIG. 6 is a plan view of a bed showing a third embodiment of the device of the present invention.

FIG. 7 is a block diagram schematically showing the entire impulse radar.

FIG. 8 is a detailed block diagram of a transmission / reception unit and a control unit of the impulse radar.

FIG. 9 is a waveform diagram showing a transmission / reception waveform of an impulse radar.

FIG. 10 is a waveform diagram for explaining sampling pulse generation processing.

FIG. 11 is a waveform diagram for explaining a reference waveform generation process for frequency conversion.

FIG. 12 is a waveform diagram for explaining sampling timing generation processing.

FIG. 13 is a flowchart showing the operation of a received signal processing section.

FIG. 14 is a block diagram showing the configuration of a human body monitoring device.

FIG. 15 is a flowchart of a human body monitoring process.

FIG. 16 is an explanatory diagram of the action of detecting a change in the state of the human body.

FIG. 17 is a schematic diagram showing conventional human body detection using a pyroelectric sensor.

FIG. 18 is a schematic diagram showing conventional human body detection using a mat sensor.

[Explanation of symbols]

1 nursing bed 1a bed housing 1b mat 2a bed housing 2b mat 2c bed top 2d bed top plate 3 nursing beds 3b mat 4 impulse radar 4a, 4b, 4c impulse radar 4a1 Impulse radar 4a detection range 4b1 Impulse radar 4b detection range 4c1 Impulse radar 4c detection range 5 Mounting bracket 6 mattress 7 pillows 10 Transmitter 11 Receiver 11a Sampling pulse generator 11b Sampling unit 11c receiving antenna 12a, 12b Clock generator 12c Received signal processing unit 13 Electromagnetic wave reflector 20 microcomputer 20a processing unit 21a Transmitter signal section 21b Status signal generator 22 transistor 23 Relay 24 contacts 25 power 26 transmitter 27 antenna 28 Nurse Center p human body tA to tE sampling timing L distance data LT threshold Time to reach T1 threshold L Time from T2 reference point to sampling point Time delay of reflected wave from T3 impulse radar 4b Time delay of reflected wave from T4 impulse radar 4a Lmin near limit Lmax far limit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Nishi, Omron Co., Ltd., 10 No.10, Hakuen Tudodo-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture (56) Reference JP-A-9-66077 (JP, A) JP-A-8 -47486 (JP, A) Japanese Patent Laid-Open No. 11-151209 (JP, A) Actual Development 4-30504 (JP, U) International Publication 99/4285 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61G 7/043 A61G 12/00 G01V 3/12 G08B 21/22

Claims (9)

(57) [Claims] [Claim 1] and transmits an impulse-like electromagnetic wave having an impulse radar that receives a reflected wave from the human body, a human body detecting device for detecting a human body from the state of the reflected wave, the
The impulse radar is a human body detection device that is provided below the mat of the bed and transmits electromagnetic waves to a range including all or part of a region where the human body on the bed may normally exist. 2. A human body that transmits impulse-shaped electromagnetic waves
It has an impulse radar that receives reflected waves from
A human body detection device for detecting a human body from the above condition, wherein the impulse radar is hidden above the mat of the bed.
Provided by蔽, it transmits electromagnetic waves to range comprising all or part of a region where the human body on the bed may be normally present, human body detecting device. 3. The detection area of the impulse radar is the whole or a part of an area where a human body on a bed can normally exist.
The human body detection device according to claim 1, which is limited to a predetermined range including the human body detection device. 4. A signal representing the presence or absence of a human body is generated and transmitted.
The person on the bed at the receiving end of the signal
The human body detection device according to claim 3 , wherein the presence or absence of the object can be remotely detected . 5. A plurality of detection areas having different ranges from each other
Each impulse radar has a
Based on the state of the reflected wave to generate a signal representative of the human operation state and transmit to, thereby to the condition of a person on the bed on the receiving side of the signal to be remote sensing, according to claim 1 or 2 Human body detection device. 6. An area of a bed where a human body may normally be present.
Impulse-shaped electromagnetic wave is sent to the range including all or part
And an impulse radar that receives the reflected waves from the human body
And the impulse radar is below the bed mat.
Hidden in the area above or above the bed mat
Provided Te, with a human body detecting device, it detect the human body from the state of the reflected wave bed. 7. The bevel according to claim 6, wherein a detection area of the impulse radar is limited to a predetermined range including all or a part of an area where a human body on a bed can normally exist. Dead. 8. The human body detection device according to claim 4,
Receives a signal that indicates the presence or absence of the human body, and determines the state of that signal
And a receiving means for notifying when the condition of
Human body detection system . 9. A human body comprising: the human body detection device according to claim 5; and a receiving unit that receives a signal indicating an operating state of the human body and notifies when the state of the signal satisfies a predetermined condition. Detection system.