JPH1176178A - Detecting system for presence or absence of person on bed and monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system capable of detecting the presence or absence of a person on a bed with high reliability at low cost and a monitoring system using the same. SOLUTION: This system includes a load detection means 2 for detecting the value of the load applied to a bed 1, a determining means 3 for determining whether a person is present or absent on the bed according to a signal from the load detection means 2, a transmission means 4 for transmitting the result of the determination, an alarm means 5 for issuing an alarm according to the result of the determination, and an external switch having a releasing function whereby the alarm means 5 can be shut off, the determining means 3 detecting that the load value detected by the load detection means 2 has exceeded a preset threshold and continued for a predetermined time. Thereafter, if the load value detected by the load detection means 2 is below the preset threshold and continued for a predetermined time, the system determines that the person has left the bed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an out-of-bed detection system used to detect whether or not a person is present on a bed, and a monitoring system configured using the out-of-bed detection system. It is about.

[0002]

2. Description of the Related Art Conventionally, in hospitals, nursing homes, hotels, and the like that are used by many people, for example, in a hospital, whether a patient is on a bed installed in each sickroom or not is determined.
That is, a nurse performs a tour of a hospital room or a bed because it is necessary to know whether an inpatient is sleeping on a bed or leaving the bed and wandering. However, since it is impossible to continuously patrol all the beds of the hospitalized patient, as a method of monitoring the sleeping state, as disclosed in Japanese Utility Model Laid-Open Publication No. 4-30504, the bedside and bedside are disclosed. On the other hand, a method has been proposed in which a plurality of pyroelectric infrared sensors and a thermopile are installed horizontally.

[0003]

By the way, it is complicated to install a plurality of pyroelectric infrared sensors and thermopiles next to the bed and horizontally with respect to the bedside to monitor the sleeping state. There is a problem that the cost is increased and the human body is erroneously detected by the warmth of the futon even without the human body.

The present invention, in consideration of the above-mentioned problems of the conventional occupancy control method, provides a highly reliable and low-cost occupancy and wake detection system and a monitoring system using the same. The purpose is to do so.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides one or more load detecting means for detecting a load value applied to a bed; A leaving bed occupancy detection system, comprising: a deciding unit for deciding whether the occupant is out of bed or being in bed, and a transmitting unit that transmits the result of the determination.

[0006] Further, an alarm means for issuing an alarm based on the judgment result is provided on a corridor side of a hospital room or the like or on a centralized control monitor, and furthermore, by having a canceling function, a care worker's response system can be quickly returned. Is what you do.

Further, after the bed user leaves the bed,
The automatic monitoring is facilitated by adding a function of automatically measuring and operating when a load is applied to the bed for a predetermined time or more.

Further, in a hospital or the like, the presence / absence information from a sensor is centrally managed via an Ethernet laid in the hospital, and displayed on a monitor screen for each bed, so that it can be easily and collectively. It is possible to manage the sleeping state of the patient.

By doing so, it is possible to eliminate the drawbacks of the conventional method, and to easily obtain an accurate, reliable, and low-cost out-of-bed detection system and a method using the same.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) An out-of-bed detecting system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a first embodiment of the present invention, which can detect the leaving of a sleeping person in a bed. Load value detecting means 2 capable of detecting the load of the bed is installed on one support of the bed 1.
The load value detecting means 2 is connected to the leaving-bed determining means 3, and is connected to the alarm means 5 via the transmitting means 4.

Now, when a sleeping person enters a bed in an unmanned state and further leaves the bed, the leaving-bed determining means 3 operates according to the load value change amount of the load-value detecting means 2 and sends a signal to the alarm means 4. I do.

FIG. 2 is a view showing a specific installation state, wherein the alarm means 5 is installed outside the bedroom, that is, on the corridor side or the like. The load detecting means 2 has a structure in which a sensor utilizing deformation of a strain resistor, a load cell or a coil spring (spring) is interposed between the caster of the bed support 1a and the floor surface. Functions may be provided. Further, the leaving-bed determining means 3 and the signal transmitting means 4 may be integrated. The connection between the load detecting means 3 and the leaving-of-bed determining means 4 is basically based on an analog line, and the signal form between the signal transmitting means 4 and the alarm means 5 is determined by a contact signal such as a relay or a photocoupler. Is desirable. For example, a latch pulse signal of about 100 msec may be used. In particular, by using a contact signal from a photocoupler or the like, the circuit system of the alarm unit 5 and the circuit system of the leaving-bed judging unit 3 can be separated, and a highly reliable system resistant to noise can be obtained.

The alarm means 5 may be a continuous or intermittent alarm by a lamp or a sound, but the specific method is not particularly limited. Further, it is preferable to release the alarm state after the caregiver or the like has confirmed the state of the sleeping person. For this purpose, it is effective to provide a release function 6 such as a button for externally releasing the alarm state.

FIG. 3 shows the state when the load value detecting means 2 enters the floor.
This indicates a change in the load value when the user is in the bed or when the user leaves the bed. In view of the change, for example, by setting a determination threshold to the load value A (dotted line), the state of leaving the bed can be accurately determined.

FIG. 4 shows an example of the basic operation of the present system.

1) When the power is turned on, the system automatically starts up. 2) If the load value is equal to or greater than a predetermined value and equal to or greater than a predetermined time (for example, 10 seconds) by the load value detection means 2, measurement of bed leaving detection is started (Step S1,
S2). 3) If the above two conditions are not satisfied, the standby state is maintained (step S1). 4) At this time, a bed entry signal (step S3) may be transmitted to the management side of the system. 5) After the start of leaving-bed detection measurement, the load value detecting means 2
When the load value falls below a predetermined value for a certain time (for example, 10
Seconds) or more, it is determined that the user has left the bed and an alarm signal is transmitted (steps S4 and S5). The individual corridor light blinks and the individual light of the management center blinks by the alarm signal.
Also, an alarm is generated. 6) The alarm is turned off when the external release signal comes (step S5). 7) After the state of the above 5) and when the external release signal is input, the state returns to the state of the above 2) (step S6). 8) The threshold value of the load value used for the leaving-bed determination can be changed externally (step S7).

The functions described above may be performed by a computer for a centralized management system, but a microcomputer may be incorporated in the circuit of the leaving determination means 3 so that the sleeping state of a sleeping person can be detected with high precision and automatically. It can detect and issue an alarm. In this case, it is preferable to change the threshold value using a dip switch or the like.

Next, a specific method of the above-described leaving-bed determination will be further described.

For example, when the weight of the bed is 100 kg, the load applied to one bed of four pillars is
Although it is 25 kg of 1/4, it is not always ideal 1/4 depending on the level of the floor surface, the structure of the bed, and the auxiliary equipment of the bed.
Not necessarily. However, when a person enters the bed, it is assumed that an adult weighs 30 kg or more if it is an adult, and + about (30/4 = 7.5 k) if it is at the center of the bed.
g) is additionally loaded by the load value detecting means 2. Although not always sleeping in the middle,
When the load change is +3 kg or more and is several tens of seconds or longer, the bed is released from the bed, so that the presence of the floor can be detected accurately. As a criterion, a fluctuation value of about 1/8 of the weight of the bed user was used, and it was possible to detect with high accuracy practically.

In the above-described detection of the bed leaving state, the central management system turns on the monitor-TV in accordance with the bed leaving signal, so that the bed state of the care-requiring person or the like can be monitored in a remote state. According to this method, it is not necessary to constantly look at the surveillance camera, and a plurality of persons can be efficiently cared for.

That is, as shown in FIG. 5, the signals from the bed leaving determining means 3 for determining the presence / absence of each bed in each hospital room are received by the corresponding signal transmitting means 4, and the built-in signal processing is performed. The presence / absence information output from the circuit is centrally managed via an Ethernet 10 laid in the hospital via an IFU (interface unit), and displayed at the nurse station 11 for each bed on a monitor screen, for example. Let it. As described above, the load value detecting means 2 and the signal processing circuits 3 and 4 are managed efficiently and centrally via the Ethernet 10, and the centralized control device 1
By displaying the presence / absence information in each bed on 1 and monitoring the information there, it is possible to reduce the size of the device and reduce the cost.

On the other hand, the devices 4, 5 or 6 on each bed side can process and display the presence / absence information in real time, thereby automatically and efficiently managing the sleeping person.

Such a leaving-bed detection system device is very simple in terms of system, and by using this sensor system, highly reliable and accurate human body detection and floor presence determination can be easily performed at low cost. Can provide a comfortable hospital.

Further, by installing an alarming means 12 for issuing an alarm based on the judgment result as an audio speaker or the like in the vicinity of the central control device separately from the monitor screen, quick response can be made possible.

Further, by introducing the third confirmation means such as a monitoring camera, if the safety of the person leaving the bed can be confirmed in the central control room (nurse center), the alarm means 5 and 12 can be shut off in the central control device. By having the release function, care work can be performed efficiently.

In addition, an electromagnetic wave transmitter is installed as a transmitting means 4 for transmitting the determination result from the leaving-bed determining means 3 on the frame portion of the bed or the bed body, and a signal from the determining means 3 is transmitted from the transmitting means 4 in a non-contact manner. By transmitting the signal to the electromagnetic wave signal receiving unit provided on the ceiling, wall, or floor of the room, the bed can be installed at any position.

Further, using the determination result from the leaving-bed determining means 3, a bed user's daily leaving-bed pattern is acquired by using a computer (see the leaving-pattern acquiring means 13 in FIG. 1) and the like. If the usage pattern deviates significantly, a computer (the abnormality determination unit 14) may determine that an abnormality has occurred.

(Embodiment 2) An on-bed status detection system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a schematic diagram showing a sleeping person in a bed according to the second embodiment of the present invention. The two bed supports 21 and 22 on the head side of the bed 1 are load detecting means 41 such as a load cell that can detect the load on the bed via the casters 31 and 32.
42. The load detecting means 41, 42
Is connected to the in-bed state determination means 51. A reset signal generating means 52 is also connected to the occupancy state determining means.

Now, the unmanned bed 1 has the load sensor 4
Reset switch 52 when installed on
By operating the unmanned casters 31, 3
The load value applied to 2 is initialized in the sensor signal processing device 51, and is set to B0 and C0, respectively.

The reset signal generating means 52 may be a contact switch provided externally or an electric electronic signal generating circuit inside the circuit.

The values of B0 and C0 differ depending on the equipment mounted on the bed, and also vary depending on the movement of the bed. If a person enters the bed in this state,
The weight is distributed and loaded on the four pillars of the bed. If the values of the respective load value detecting means are B1 and C1, B1 and C1 always vary depending on where they are sleeping.

Therefore, in order to determine the state of being in bed more accurately,

[0034]

## EQU1 ## When B1-B0 = BX, C1-C0 = CX, HW1 = threshold for determining the presence of bed, and HW2 = threshold for determination of leaving the bed.

[0035]

## EQU00002 ## It was found that it is better to leave the bed when BX> HW1 OR CX> HW1 and to leave the bed when BX <HW2 AND CX <HW2.

HW1 is 1/1 of the weight of the bed sleeper.
By setting the HW2 in the range of 8 to 1/4 and the HW2 in the range of 0 to 1/20, it was possible to determine the presence / absence of bed accurately. Furthermore, in order to improve the determination accuracy, when each state continues for a certain period of time T1 or more, it is preferable to estimate the in-bed state and the out-of-bed state. The preferred range of T1 was 1 second to 10 seconds.

The reset signal generation means 52 is not always necessary, and B0 and C0 may be determined in advance by a microcomputer or the like.

The load detecting means 41 and 42 have an advantage that they can be mounted on an existing bed by providing a structure in which a load cell is interposed between a caster of a bed support and a floor surface. However, as a matter of course, this function may be provided in the bed support in advance.

(Embodiment 3) In the same apparatus as that of the second embodiment, when the unmanned bed 1 is set on the load sensors 41 and 42, the reset switch 52 is operated. Casters 31, 32 in state
Are initialized in the sensor signal processing device 51, and are set to B0 and C0, respectively.

As described above, the values of B0 and C0 are
It depends on the equipment mounted on the bed,
It also changes depending on the movement of the bed. When a person enters the bed in this state, the weight is dispersed and loaded on the four pillars of the bed. If the values of the respective load value detecting means are B1 and C1, B1 and C1 are always determined depending on the sleeping position. C1 varies.

Therefore, as a second method for determining the state of being in bed more accurately,

[0042]

## EQU3 ## B1-B0 = BX, C1-C0 = CX, BX +
When CX = DX HW3 = threshold for bed determination and HW4 = threshold for bed release determination

[0043]

## EQU4 ## It was found that it is better to leave the bed when DX> HW3 and to leave the bed when DX <HW4.

HW3 is 1/1 of the weight of the bed sleeper.
By setting the HW4 in the range of 6 to 1/4 and the HW4 in the range of 0 to 1/20, it was possible to determine the presence / absence of bed accurately.

By using the second method, it was possible to detect the bed with high accuracy even if the bed was placed out of balance and slightly inclined.

Further, in order to improve the judgment accuracy, when each state continues for a certain period of time T1 or more, it is preferable to estimate the state of being in bed and the state of leaving bed. Preferred T1
Ranged from 1 second to 10 seconds. (Embodiment 4) FIG. 7 shows a fourth embodiment of the present invention. The load detecting means 41 and 42 are installed on the two bed posts on the head side of the bed. Load detection means 4
Reference numerals 1 and 42 are connected to the in-bed state determination means 51. The monitoring system is further provided with a transmission unit 53 for transmitting the determination result and an alarm unit 61 for issuing an alarm based on the determination result. Moreover, the release function 6 is provided as an external control signal.
2 is effective. The configuration operation after the determination in the monitoring system of the fourth embodiment can be configured in the same manner as the fixed operation configuration in the first embodiment, and a detailed description thereof will be omitted.

Incidentally, a nurse call system is generally introduced in hospitals and facilities. In these nurse call systems, a "call button" or an "emergency call button" is installed at the bedside. These buttons are normally turned on by pressing the button.
It is a system that can notify the caregiver. Therefore, the signals from the signal transmission means 4 and 53 for determining whether each bed is in bed or leaving the bed are input as contact signals to the above-mentioned respective "calling button" lines of the existing nurse call system. Thus, both systems can be used in common, and the leaving information of each bed can be easily and automatically grasped, and the monitoring effort by the caregiver can be greatly reduced.

Further, the load detecting means of the present invention may include one or two
The number is not limited to three, and may be three or more.

The present invention is applicable not only to hospitals but also to other buildings such as hotels.

[0050]

As is apparent from the above description, according to the present invention, the presence / absence information of a sleeping person in a bed of a hospital or the like can be easily and accurately obtained with high reliability by using the leaving-bed detection system. be able to.

Further, an alarm means for issuing an alarm based on the judgment result is provided on the corridor side of a hospital room or the like or on a centralized control monitor, and a reset function is added so that the caregiver's response system can be quickly returned. It is assumed that.

Further, after the bed user leaves the bed,
The automatic monitoring is simplified by adding a function of automatically measuring and operating when a load is applied to the bed for a certain period of time or more.

Further, by centrally managing sensors and signal processing circuits via Ethernet, and displaying and monitoring the presence / absence information in each bed on a centralized control device, the device can be made compact and the cost can be reduced. Can also be lower.

As described above, the system for detecting the presence of a person in bed and the monitoring system according to the present invention are very simple in terms of system, and by using this sensor system, accurate human body detection can be easily performed at low cost. This can greatly contribute to efficient bed detection.

Therefore, by using the present invention, it is possible to easily, highly accurately and highly reliably detect the occupancy of the bed, which can greatly contribute to making the hospital intelligent.

[Brief description of the drawings]

FIG. 1 is a block diagram of an out-of-bed detection system according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the leaving-bed-in-bed detection system according to the first embodiment of the present invention.

FIG. 3 is an output characteristic graph of a load detecting unit according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the leaving-bed-in-bed detecting system according to the first embodiment of the present invention.

FIG. 5 is a connection state diagram of the monitoring system according to the first embodiment of the present invention.

FIG. 6 is a perspective view of an out-of-bed occupancy detection system according to a second embodiment of the present invention.

FIG. 7 is a block diagram of a monitoring system according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Bed 2, 41, 42 Load detection means 3 (Getting out of bed) judgment means 4, 53 Signal transmission means 5, 61 Warning means 6, 62 Release function 13 Bed leaving pattern acquisition means 14 Abnormality judgment means 21, 22, 1a Bed support 31, 32 casters 51 occupancy determination means 52 reset signal generation means

Claims (24)

[Claims] 1. A load detecting means for detecting a load value applied to a bed, a determining means for determining whether a person leaves the bed or staying in bed based on a signal from the load detecting means, and a transmitting means for transmitting the determination result. An out-of-bed detection system characterized by comprising: 2. The wakeup detection system according to claim 1, further comprising an alarm unit for issuing an alarm based on the determination result. 3. The wake-up detection system according to claim 2, further comprising an external switch having a release function capable of shutting off the alarm means. 4. When the load value detected by the load detection means exceeds a preset threshold value and the load value continues for a predetermined time, it is determined that a person is on the bed. 3. The method according to claim 1, wherein the determination is performed.
Or the leaving-bed-in-bed detection system according to 3. 5. When the load value detected by the load detecting means is equal to or less than a preset threshold value and the load value has continued for a predetermined time, the determining means determines that a person has left the bed. The method according to claim 1,
4. The leaving bed detection system according to 2 or 3. 6. The determining means detects that the load value detected by the load detecting means has exceeded a preset threshold value and has continued for a predetermined time, and thereafter,
When the load value detected by the load detection unit is equal to or less than a predetermined threshold value and the load value is continued for a predetermined time, the unit determines that a person has left the bed. The leaving-bed-in-bed detection system according to claim 1, 2, or 3. 7. The determination means determines the presence or absence of the bed using a threshold value equal to or more than 1/8 of the weight of the bed user, and determines the determination of the state of leaving the bed as one of the weight of the bed user. The leaving-bed occupancy detection system according to any one of claims 1 to 6, wherein the occupancy is less than / 8. 8. The load detecting means is provided between two support frame portions on the head side of the bed or between the support frame portion and the floor, and based on two detection results of the two load detect means. 4. The system for detecting the presence of a person in bed as claimed in claim 1, wherein the determination means determines whether the person is getting out of bed or staying in bed. 9. When the sum of the detected load values of the two load detecting means reaches a certain value or more for a certain time or more, the determining means determines that the vehicle is in the floor or the sum is equal to or more than a certain time. 9. The leaving-bed-existing-in-bed detection system according to claim 8, wherein it is determined that the user has exited from the bed when the value falls below a predetermined value during the period. 10. The determining means determines that the vehicle is in bed when one of the detected load values of the two load detecting means has reached a certain value or more for a certain time or more. 9. The bed leaving detection system according to claim 8, wherein when the detected load value of the load detecting means becomes equal to or smaller than a predetermined value for a predetermined time or more, it is determined that the user has left the bed. 11. A load signal when a person is absent is taken as an initial value by means of a reset signal generating means provided, and said judging means judges leaving or occupying the floor using the initial value. The wakeup detection system according to claim 9 or 10, 12. The apparatus according to claim 1, wherein the load detecting means is provided between any one of the support frame portions or the frame portion of the bed having four support frame portions and the floor surface. 8. The leaving-bed occupancy detection system according to any one of claims 7 to 7. 13. The monitoring camera according to claim 1, further comprising a monitoring camera for monitoring a bed user, wherein the monitoring camera is activated when the leaving unit is determined by the determination unit. Bed detection system. 14. The system according to claim 1, wherein the presence / absence information output from said transmitting means is centrally managed via an Ethernet installed in the building. Floor detection system. 15. The bed warning device according to claim 2, wherein said warning means is provided outside each room of the bed user.
The wakeup detection system according to any one of the above. 16. The leaving-bed detection system according to claim 14, wherein the alarming means is installed in or near a device for centralized management. 17. The leaving-bed detection system according to claim 14, wherein the central control device has a release function that can automatically shut off the alarm unit. 18. The leaving bed according to any one of claims 1 to 17, wherein the signal indicating the state of being in bed or leaving the bed transmitted from the signal transmitting means is a contact signal by a relay, a photocoupler or the like. Floor presence detection system. 19. An electromagnetic wave transmitter is provided as a transmitting means on a frame portion or a bed body of a bed, and a signal from the determining means is provided on a ceiling, wall or floor in a room without contact from the electromagnetic wave transmitter. 20. The leaving-bed occupancy detection system according to any one of claims 1 to 19, wherein the detection signal is transmitted to an electromagnetic wave signal receiving unit. 20. A bed occupancy pattern acquisition means for acquiring and storing a daily bed wakeup pattern based on the determination result of the person in bed by the determination means, and a bed user using an output from the wakeup pattern acquisition means. 2. The apparatus according to claim 1, further comprising abnormality determination means for determining an abnormal state of the vehicle.
20. The out-of-bed detection system according to any one of to 19, 21. An out-of-bed detection system according to any one of claims 1 to 20, and an out-of-bed detection system output by the system.
A monitoring system, comprising: a centralized management system such as a nurse call system for inputting an out-of-bed signal. 22. The centralized management system, wherein the main power supply is O
22. The apparatus according to claim 21, wherein monitoring of a person's monitor or the like is automatically started from a point in time when the determination means recognizes that the person is occupied by a signal from the load detection means.
The described monitoring system. 23. The monitoring system according to claim 21, wherein an individual corridor light or an individual alarm lamp of the centralized management system blinks or an alarm is issued based on the leaving information output from the transmission unit. 24. The monitoring system according to claim 23, wherein the release and measurement are automatically restarted by an individual corridor light or a release button of the centralized management system.