JP2001025490A - Bed apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bed apparatus capable of detecting and alarming abnormality of an old person of dementia, especially, in the condition where he is on a bed. SOLUTION: This apparatus is provided with a bed 8, a first to a fourth load detectors 9a-9d to detect a load applied on a sleeping floor part 11 of the bed 8 to generate a load signal, a weight operation means to operate a weight applied on the sleeping floor part 11 based on the load signal, a gravity center position operation means to operate a gravity center position of the weight of a user on the floor part 11 based on the load signal. The apparatus is also provided with a move distance operation means to operate a gravity center position move distance based on a plurality of gravity center positions obtained by operation of the gravity center position operation means, and a display and alarm part to generate an alarm when the weight on the floor part 11 obtained by operation of the weight operation means is lighter than a specified weight, when the gravity center position obtained by operation of the gravity center position operation means is within ranges of the floor part 11 (getting on/off parts 14 and 15), or when total move distance of move distance for the five gravity center position obtained by operation of the move distance means is longer than a specified upper limit distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed apparatus adapted for nursing or nursing a disabled person such as a demented elderly person or a bedridden elderly person.

[0002]

2. Description of the Related Art An example of a conventional bed apparatus will be described with reference to FIG. 8 (see Japanese Patent Publication No. 3-51411). In this couch device, a load detector 3 is provided on each of four legs 2 provided in a bed (couch) 1, and each load detector 3 is electrically connected to a weight measurement and monitoring device 4. . An alarm unit 5 is electrically connected to the weight measuring and monitoring device 4.

According to this bed apparatus, when a user such as a patient is placed on the bed 1, the load detector 3 generates a load signal corresponding to the weight of the user, and the load signal is used as the weight measurement and monitoring device 4. To enter. The weight measuring and monitoring device 4 can calculate the total value of the four load signals and display the weight of the user on a display unit (not shown). As described above, since the weight can be measured while the user is on the bed 6 of the bed 1, the weight of the patient or the elderly with dementia can be easily managed.

[0004] The weight measuring and monitoring device 4 calculates the load such as the weight of the user on the bed 1 at appropriate time intervals, stores the load value in the storage unit, and obtains the load obtained by the previous calculation. A load difference between the value and the load value obtained this time is calculated, and it is determined whether the load difference obtained by this calculation is larger than a predetermined load difference. When it is determined that the load difference calculated this time is larger than a predetermined load difference, a warning signal is sent to the warning unit 5 to turn on a warning lamp and output a warning sound. Thus, when the user is, for example, a demented elderly person, the start of wandering can be notified to a caregiver or a nurse, so that accidents or the like of the demented elderly person can be prevented beforehand.

[0005]

However, the conventional bed apparatus shown in FIG. 8 can notify a caregiver or the like that a user, for example, a demented elderly person, has fallen from the bed 1. However, there is a problem that the abnormality of the user cannot be detected while the user is on the bed 1. In other words, it is difficult for a demented elderly person or a bedridden elderly person to accurately convey his / her desire to seek care to a caregiver. It is strongly demanded that people, etc. be notified accurately. In particular, at night, a small number of caregivers or nurses need to care for a large number of elderly people or sick people, so that abnormalities of elderly people sleeping on the bed 1 can be promptly reported to the caregivers. Doing so is strongly desired to protect the health and safety of the cared elderly and to reduce the caregiver's labor. Therefore,
There is a method of monitoring a user sleeping on the bed 1 with a monitor camera, but this method violates the privacy of the user and it is difficult for a caregiver to continuously monitor one or many monitors. In many cases, monitor cameras cannot be used.

[0006] An abnormality in the state where the user is on the bed 1 is that the user actively moves on the bed 1. If the user is a demented elderly person, the user may erroneously stand on the bed 1 as well as on the futon of his / her home, and move actively on the bed 1 when trying to stand. Since it is very dangerous for a demented elderly to stand on bed 1, the caregiver must go to care for the elderly.

[0007] Anomaly when the user is on the bed 1 can also be mentioned when the user, such as a demented elderly person, is sitting on the edge of the bed 1. When the old man is sitting on the edge of the bed 1, he is awake and trying to get off the bed 1. When the old man wakes up or gets out of bed 1 at night, the caregiver needs to go to the old man's care.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bed apparatus capable of detecting an abnormality in a state of being placed on a bed of a user and providing a bed apparatus capable of reporting the abnormality of the user. I do.

[0009]

According to a first aspect of the present invention, there is provided a bed,
Load detecting means for detecting a load applied to the bed of the bed to generate a load signal, and a center of gravity position calculating means for calculating the center of gravity of the weight of the user on the bed based on the load signal, It is characterized by having. According to a second aspect, in the bed apparatus of the first aspect, the bed apparatus further includes a moving distance calculating means for calculating a moving distance of the center of gravity based on the plurality of center of gravity positions obtained by the calculating by the center of gravity calculating means. It is characterized by the following. The third invention is
The bed apparatus according to a first aspect of the present invention is characterized in that the couch device further comprises a moving speed calculating means for calculating a moving speed of the position of the center of gravity based on the plurality of positions of the center of gravity obtained by the calculating means. is there. According to a fourth aspect, in the bed apparatus of the first aspect, a center-of-gravity position determining unit determines whether a center-of-gravity position obtained by the calculation by the center-of-gravity position calculating unit is within a predetermined area of the bed. Means are provided.

According to a fifth aspect of the present invention, there is provided a bed, load detecting means for detecting a load applied to the bed of the bed and generating a load signal, and detecting a weight of a user on the bed based on the load signal. And a center-of-gravity-position-related information calculating means for calculating information related to the center of gravity. According to a sixth aspect of the present invention, in the bed apparatus of the fifth aspect, the bed apparatus further comprises a moving distance calculating means for calculating a moving distance of the center of gravity based on the information obtained by the calculation by the center of gravity related information calculating means. It is a feature. According to a seventh aspect of the present invention, in the bed apparatus of the fifth aspect, the bed apparatus further comprises a moving speed calculating means for calculating a moving speed of the center of gravity based on the information obtained by the calculation by the center of gravity related information calculating means. It is a feature. According to an eighth aspect, in the bed apparatus according to the fifth aspect, a range in which the position of the center of gravity obtained based on the information obtained by the calculation by the center-of-gravity position-related information calculation means is predetermined in the bed. It is characterized by comprising a center-of-gravity position existence range determining means for determining whether or not it is within the region.

According to a ninth aspect, in the bed apparatus according to the second or sixth aspect, it is determined whether or not the moving distance of the center of gravity obtained by the moving distance calculating means is longer than a predetermined upper limit distance. It is characterized by comprising an upper limit distance determining means for determining whether The tenth invention is the second or sixth invention.
The bed apparatus according to the invention, further comprising a lower limit distance determining unit that determines whether the moving distance of the center of gravity obtained by the moving distance calculating unit is shorter than a predetermined lower limit distance. It is assumed that. The eleventh invention is
The bed apparatus according to the third or seventh aspect of the present invention, further includes a speed determining unit that determines whether the moving speed of the position of the center of gravity obtained by the moving speed calculating unit is higher than a predetermined upper limit speed. It is characterized by doing. In a twelfth aspect, in the bed apparatus according to the fourth aspect, the center-of-gravity position determining unit determines that the center-of-gravity position calculated by the center-of-gravity position calculating unit is within a predetermined area near the edge of the bed or in the vicinity thereof. It is characterized by comprising first alarm means for generating an alarm signal when the judgment is made.

According to a thirteenth aspect, in the bed apparatus according to the eighth aspect, the range in which the center of gravity calculated by the center-of-gravity-position-related information calculating means exists is a predetermined area near the edge of the bed or the vicinity thereof. And a first warning means for generating a warning signal when the center-of-gravity position existence range determining means determines that the position is within the range. According to a fourteenth aspect, in the couch device of the ninth aspect, the moving distance of the center of gravity calculated by the moving distance calculating means or the total moving distance of two or more moving distances is longer than a predetermined upper limit distance. It is characterized by comprising second alarm means for generating an alarm signal when the upper limit distance judging means judges. According to a fifteenth aspect, in the bed apparatus according to the tenth aspect, an alarm is issued when the lower limit distance determining unit determines that the moving distance of the center of gravity calculated by the moving distance calculating unit is shorter than a predetermined lower limit distance. A third alarm means for generating a signal is provided. Sixteenth
According to the tenth aspect of the present invention, in the bed apparatus according to the tenth aspect, when the lower limit distance determining unit determines that the moving distance of the center of gravity position calculated by the moving distance calculating unit is shorter than a predetermined lower limit distance, Timer means for measuring the time until the lower limit distance determination means determines that the movement distance is longer than a predetermined lower limit distance, and whether the time measured by the timer means is longer than a predetermined upper limit time. And a third alarm unit that generates an alarm signal when the time determination unit determines that the time measured by the clock unit is longer than the upper limit time. Things. According to a seventeenth aspect, in the bed apparatus of the eleventh aspect, an alarm signal is issued when the speed determining means determines that the moving speed of the center of gravity position calculated by the moving speed calculating means is faster than a predetermined upper limit speed. And a fourth alarm means for generating

An eighteenth aspect of the present invention provides a bed, load detecting means for detecting a load applied to the bed of the bed and generating a load signal, and detecting a weight of a user on the bed based on the load signal. A center-of-gravity position calculating means for calculating a center-of-gravity position, and an alarm signal is generated when the center-of-gravity position calculated by the center-of-gravity position calculating means is within a predetermined area near the edge of the bed or the vicinity thereof. A first alarming means, a moving distance calculating means for calculating a moving distance of the center of gravity based on a plurality of positions of the center of gravity obtained by the calculating means, and a moving distance calculating means for calculating the moving distance of the center of gravity. Second alarm means for generating an alarm signal when the moving distance of the set center of gravity is longer than a predetermined upper limit distance; and an alarm signal when the moving distance of the center of gravity is shorter than a predetermined lower limit distance. Third alarm hand that generates When, it is characterized in that it comprises. A nineteenth invention is directed to a bed, load detecting means for detecting a load applied to the bed of the bed to generate a load signal, and a center of gravity of a user's weight on the bed based on the load signal. The center of gravity position related information calculation means for calculating information, and the range where the center of gravity position obtained by the calculation by the center of gravity position related information calculation means is located within a predetermined area near the edge of the bed or the vicinity thereof. First alarming means for generating an alarm signal at a certain time, moving distance calculating means for calculating a moving distance of the center of gravity based on information obtained by calculating the center of gravity related information calculating means; Second alarm means for generating an alarm signal when the moving distance of the position of the center of gravity obtained by the calculating means is longer than a predetermined upper limit distance; Alert when shorter than A third alarm means for generating an item, is characterized in that it comprises.

According to a twentieth aspect, in the bed apparatus according to any one of the first to nineteenth aspects, weight calculating means for calculating the weight applied to the bed based on the load signal, and the weight calculating means And a fifth alarm means for generating an alarm signal when the weight on the bed obtained by the calculation is smaller than a predetermined lower limit weight. According to a twenty-first aspect, in the bed apparatus according to any one of the first to twentieth aspects, the load detecting means detects a load applied to the bed at three places. A twenty-second invention is directed to the first and second embodiments.
0 in the bed apparatus according to any one of the aspects of the invention, wherein the load detecting means detects a load applied to the bed at two places.

According to the first aspect, the load detecting means detects a load applied to the bed of the bed, and based on the load signal corresponding to the load applied to the bed, the center-of-gravity position calculating means detects the user on the bed. The position of the center of gravity of the weight can be calculated. According to the second and sixth aspects of the invention, the moving distance calculating means can calculate the moving distance of the position of the center of gravity of the user on the bed. According to the third and seventh inventions, the moving speed calculating means can calculate the moving speed of the center of gravity of the user on the bed. According to the fourth aspect, the center-of-gravity position determining means can determine whether the position of the center of gravity of the user on the bed is within a predetermined area of the bed.

According to the fifth aspect, the load detecting means detects the load applied to the bed of the bed, and based on the load signal corresponding to the load applied to the bed, the center-of-gravity position related information calculating means detects the load on the bed. Information relating to the position of the center of gravity of the weight of the user can be calculated. According to the eighth aspect, the center-of-gravity position existence range determining means can determine whether or not the range where the position of the center of gravity of the user on the bed is present is within a predetermined area of the bed. According to the ninth aspect, the upper limit distance determining unit can determine whether the moving distance of the position of the center of gravity of the user on the bed is longer than a predetermined upper limit distance. According to the tenth aspect, the lower limit distance determination unit can determine whether the moving distance of the position of the center of gravity of the user on the bed is shorter than a predetermined lower limit distance.

According to the eleventh aspect, the speed judging means can judge whether the moving speed of the position of the center of gravity of the user on the bed is faster than a predetermined upper limit speed. First
According to the second or thirteenth aspect, the position of the center of gravity of the user on the bed or the range where the position of the center of gravity exists is within the edge of the bed or a predetermined area near the center of the bed, or the center of gravity determination means or the center of gravity. The first warning means can generate a warning signal when the position presence range determination means makes a determination. According to the fourteenth aspect, when the upper limit distance determining means determines that the moving distance of the center of gravity of the user on the bed or the total moving distance of the two or more moving distances is longer than the predetermined upper limit distance. Two alarm means can generate an alarm signal.

According to the fifteenth aspect, when the moving distance of the position of the center of gravity of the user on the bed is shorter than a predetermined lower limit distance, the third alarm means can generate an alarm signal. According to the sixteenth aspect, the moving distance of the position of the center of gravity is set to the predetermined lower limit distance from the time when the lower limit distance determining unit determines that the moving distance of the center of gravity of the user on the bed is shorter than the predetermined lower limit distance. If it is longer than this, the time measuring means measures the time until the lower limit distance judging means judges, and the time judging means judges whether the time measured by the time measuring means is longer than a predetermined upper limit time. Then, when the time determination means determines that the time measured by the time measurement means is longer than the upper limit time, the third alarm means can generate an alarm signal.

According to the seventeenth aspect, when the moving speed of the position of the center of gravity of the user on the bed is faster than a predetermined upper limit speed, the fourth alarm means can generate an alarm signal. The eighteenth invention is a combination of the twelfth, fourteenth, and fifteenth inventions, and operates equivalently to each invention. The nineteenth invention is a combination of the thirteenth, fourteenth, and fifteenth inventions, and operates equivalently to each invention.
According to the twentieth aspect, the weight on the bed can be calculated by the weight calculating means, and when the weight on the bed obtained by the calculation by the weight calculating means is smaller than a predetermined lower limit weight, Fifth alarm means can generate an alarm signal. According to the twenty-first and twenty-second inventions, the same operations as those of the first to twentieth inventions are performed based on the load signals generated by the load detection means provided at three or two places.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a bed apparatus according to the present invention will be described with reference to the drawings. The bed apparatus of this embodiment can be installed and used in each room of a geriatric health facility or the like in which a demented elderly person resides or stays, for example. As shown in the block diagram of FIG. 2, a large number of bed devices installed in each of these rooms are provided with a display alarm unit 7 provided in a waiting room such as a nurse station where a caregiver or a nurse is waiting. Is electrically connected to
8 shown in each figure is a bed, 9 (9a-9b) is the 1st-4th load detector, 10 is a controller.

As shown in FIG. 1, the bed 8 is a conventionally known bed and has a bed 11 having a rectangular planar shape. The bed 11 is supported by four legs 12 each formed of a caster. These four legs 1
Two are arranged along the longer edge of the bed 11 in parallel with each other, and are provided at four positions corresponding to the vertices of a rectangle in a plane parallel to the bed 11. Further, in the four legs 12, the intersection (0) of the two diagonals of the bed 11 coincides with the intersection (0) of the two diagonals of the four legs 12 when viewed from above. It is arranged as follows. Further, four fences 13 (13a to 13d) are provided along each of the four edges of the bed 11 so that a user on the bed 11 does not fall off the bed 11. However, the two fences 13a and 13b provided on each of the two longer edges parallel to each other are formed to have a length of about の of the longer edge of the bed 11. The user of the bed 8 can get on and off the bed 8 from two opposing entrance / exit sections 14 and 15 on both sides of the bed 11 where the fence 13 is not provided.

Each of the load detectors 9 (9a to 9b) is disk-shaped, and has a shape in which the upper surface at the center is depressed. And FIG.
Is laid under each of the four legs 12, as shown in
The load of the bed 8 is supported via each leg 12. Each of the four load detectors 9 generates a load signal corresponding to a load supported by each of the load detectors 9 and outputs each of the load signals to a controller 10 that is electrically connected to each of the load detectors 9.

Although not shown in the figure, the controller 10
It has a central processing unit (CPU) and a storage unit. The storage unit stores various programs for causing the CPU to perform the arithmetic processing shown in the flowcharts of FIGS. 6 and 7, and various data, and can store desired data and programs. . Controller 10
Is a center of gravity calculating means, a weight calculating means, a moving distance calculating means, an activity level calculating means, a moving speed calculating means (activity speed calculating means), a weight determining means, a fifth
Alarm means, center of gravity position determination means, first alarm means, upper limit distance determination means, second alarm means, lower limit distance determination means, timekeeping means, time determination means, third alarm means, speed determination means, and 4 alarm means.

Also, on the upper surface of the controller 10, FIG.
As shown in the plan view of FIG.
N switch 16 and OFF switch 17, first to fifth function selection switches 18 (18a to 18e), load detector 9
, And a span adjustment switch 20 (20a to 20d) of each load detector 9 is provided. First to fifth function selection switches 18 (18a to 18e)
The corresponding weight determination function (switch 18a) and upper limit distance determination function (switch 18
b) is provided for each of the speed determination function (switch 18c), the center of gravity position determination function (switch 18d), and the lower limit distance determination function (switch 18e), and is a selection switch for operating a desired function among the functions. is there. Four switches 20 for adjusting the span of the load detector 9 are provided for each corresponding load detector 9, and are used to adjust the span of each load detector 9. By adjusting the span of each load detector 9, the center O of the bed 11 shown in FIG.
When the center of gravity of the user is located at the center, the position of the center of gravity of the weight calculated by the center of gravity position calculating means can be made to coincide with the central portion O.

As shown in the side view of FIG. 3B, one side of the controller 10 has four receptacles 21 (21a to 21a-2) to which four load detectors 9 are connected.
1d) is provided. Another one of the controllers 10
As shown in the side view of FIG. 3C, a nurse call receptacle 22 and a receptacle 24 to which a threshold setting device 23 is connected are provided on one side. The nurse call receptacle 22 is connected to the display / alarm unit 7.
The display / alarm unit 7 is installed in, for example, a nurse station (standby room) where a caregiver who cares for or cares for a demented elderly person or the like who uses the bed apparatus is on standby. As shown in FIG. 2, the display / alarm unit 7 is connected to each of the controllers 10 provided in a large number of couch devices. When an alarm signal is input from each of the controllers 10, the couch device that outputs the alarm signal is used. In order to notify the nurse that the user performing the operation is in an abnormal state, the number of the bed apparatus is displayed and an alarm sound is generated. The receptacle 24 is connected to a threshold setting device 23 via an RS232C cable 25. The threshold value setting device 23 is composed of a personal computer and a predetermined program, and determines each of weight determination means, center of gravity position determination means, upper limit distance determination means, lower limit distance determination means, speed determination means, and time determination means. This is an apparatus for setting a reference threshold value. Although the threshold setting device 23 is a device separate from the controller 10, the threshold setting device 23 may be incorporated in the controller 10.

The center-of-gravity position calculating means comprises four load detectors 9
At every predetermined time when the four load signals generated by
This is a means for calculating the position of the center of gravity of the user's weight on the bed 11 based on these four load signals. That is, the center-of-gravity position calculating means calculates the center-of-gravity position of the weight of the user on the bed 11 based on the four load signals input to the CPU via the multiplexer provided in the controller 10. The coordinates of the center of gravity of this weight (X, Y)
(Hereinafter, “center-of-gravity coordinates (X, Y)”) are represented by X, Y orthogonal coordinates shown in FIG. 1 and FIG. The X and Y coordinates are such that the center O on the bed 11 is the origin of the X and Y coordinates, the X axis is parallel to the length of the bed 11, and the Y axis is parallel to the width of the bed 11. ing.

Next, a method of calculating the position of the center of gravity of the weight by the center of gravity calculating means will be described. Four of the first to the load signal the fourth load detector 9 (9a to 9d) is generated is input to the controller 10, the load signal W ₁₀ ~ in a state where the user is not listed in bed section 11 It is corrected zero by the controller 10 as W ₄₀ becomes zero. here,
When the user has placed on the bed portion 11, when the amount of increase in the respective load signal first to fourth load detector 9a~9d by the weight of the user to produce a W ₁ to _W-4, the following (1 ),
By the formula (2), the coordinates of the center of gravity of the user on the bed 11 (X,
Y) can be calculated.

X = (W ₁ + W ₂ −W ₃ −W ₄ ) · (1 / W _T ) · (BX / 2) ·· (1) Y = (W ₁ + W ₃ −W ₂ −W ₄ ) · (1 / W _T ) · (BY / 2) · (2) where X: FIG. 4 (a) with the center O of the bed 11 as the origin 0
4A, the coordinates in the X-axis direction shown in FIG. 4A with the origin set to 0; BX; the distance between the legs 12 of the couch 8 in the X-axis direction BY; Y of the legs 12 of the couch 8 Axial distance W _T ; weight of the user on the bed 11. The weight W _T of the user is given by W _T = W ₁ + W ₂
+ W ₃ + W ₄ , and the weight W _T is calculated by the weight calculating means.

The coordinates of the center of gravity (X, Y) and the weight W _{T of the} user
Is a load signal W _{1 of the first} to fourth load detectors 9a to 9d.
ＷW ₄ is calculated each time it is input to the controller 10. That is, the load signals W _{1 to} W ₄ input to the multiplexer of the controller 10 are sequentially transmitted to the CPU every 0.15 seconds by switching the channels of the multiplexer.
, And the input of the four load signals W _{1 to} W _{4 to} the CPU is completed in 0.15 seconds × 4 = 0.6 seconds. Therefore, the center-of-gravity position calculating means calculates the center-of-gravity coordinates (X, Y) every 0.6 seconds, and the center-of-gravity coordinates (X, Y) obtained by this calculation are:
It is stored in a storage unit (not shown) connected to the CPU. The weight calculation means may calculates the weight W _T of the user, this weight W _T also stored in the storage unit, the controller 1
0 is displayed on the display unit (not shown).

The moving distance calculating means, between the previous center coordinates of the center of gravity position calculating means is obtained by calculating _{(X K-1, Y K} -1) and the current center coordinates (X _K, Y _K) Means for calculating the linear distance (moving distance) D of. Travel distance D is calculated by from the Pythagorean theorem, calculates the _{D = {(X K -X K} -1) 2 + (Y K -Y K-1) 2} 1/2 ··· (3) Can be Where K is 1,
2,... Are numbers assigned to the barycentric coordinates calculated by the moving distance calculating means. The activity level calculating means calculates the latest five moving distances D among the moving distances D obtained by sequentially calculating every 0.6 seconds by the moving distance calculating means.
Means for sequentially calculating the sum AD (total moving distance) of
It is included in the moving distance calculation means. Therefore, AD is updated every 0.6 seconds. This AD is called an activity level. The activity level AD is the sum of the movement of the center of gravity of the weight W _T for 3 seconds, and represents the amount of activity of the user on the bed 11 every 0.6 seconds. However, the activity level calculating means calculates the sum AD of the latest five moving distances D and sets this AD as the activity level.
Instead, the activity level calculating means may calculate the sum AD of the moving distances D other than the latest five, for example, four or six, and set this AD as the activity level. Further, the movement distance D may be set as the activity level AD.

The moving speed calculating means (activity speed calculating means) calculates the moving speed AV of the position of the center of gravity based on the latest two coordinates (X, Y) of the center of gravity obtained by sequentially calculating the center of gravity position calculating means. It is. This moving speed AV
Represents the activity of the user on the bed 11 every 0.6 seconds, and can detect a sudden movement of the user,
It is called activity speed AV. Activity speed A
V is represented by a moving distance D of the center of gravity per 0.6 seconds.
Of course, the speed obtained by calculating the moving distance D / 0.6 seconds may be used as the activity speed.

The weight determining means determines whether or not the weight W _T of the user obtained by the weight calculating means, ie, whether the weight on the bed 11 is smaller than a predetermined lower limit w _1. It is means for determining. Lower weight w ₁ that is the previously set is set as shown in Table 1, as the threshold of 30kg. When the weight of the bed portion 11 is light the weight determining means than the lower weight w ₁ is determined, the user is bed section 1
It can be determined that the vehicle has descended from 1. When this determination is made, the fifth warning means generates a warning signal, and the display / warning section 7 installed in the room where the caregiver is waiting is activated. Operate. The caregiver recognizes the leaving of the user by the display of the display / alarm unit 7 and the alarm sound, and can go to the user. This makes it possible to prevent wandering when the user is an elderly with dementia.

[0033]

[Table 1]

The center-of-gravity position determining means calculates the center-of-gravity coordinates (X, Y) obtained by the center-of-gravity position calculating means in the predetermined area R near the edge of the bed 11 shown in FIG.
A means for determining whether the _one or in the range of R _2. As shown in Table 1, the regions R ₁ and R ₂ have an initial set value of 20 cm <X <70 cm and | Y |> 20c
m. The barycentric coordinates (X, Y) are in the region R
Within the range of ₁ or R ₂ (getting on and off parts 14 and 15 of bed 11)
When the center-of-gravity position determination means determines that the user is in the vehicle, the user wakes up and can determine that the user is in a state before sitting on the edge of the bed portion 11 and leaving the bed, for example. The first alarm means generates an alarm signal,
The display / alarm unit 7 operates. The caregiver recognizes the behavior of the user based on the display and the alarm sound of the display / alarm unit 7, and can go to the user to assist the user in leaving the bed. Conversely, even when the user intends to implantation, the center of gravity coordinates (X, Y) is within the range of the region R ₁ or R _2, caregivers use to the assistance of implantation of the user Can go to the person.

In the upper limit distance determining means, the activity level (moving distance) AD obtained by the calculation by the activity level calculating means is higher (longer) than a preset upper limit level (upper limit distance) ad ₁ = 100 cm. This is a means for determining whether or not the above is true. When the upper limit distance determining means determines that the activity level (moving distance) AD exceeds ad ₁ = 100 cm, it is determined that the user is actively moving on the bed 11 and taking an abnormal action. When this determination is made, the second alarm means generates an alarm signal and the display / alarm unit 7 operates. This allows the caregiver to go to the user.

The lower limit distance judging means, the timing means, the time judging means, and the third alarm means prevent the user of the bed apparatus from staying on the bed 11 for a long time to prevent the floor from rubbing. It is for. The lower limit distance determining means, the moving distance D of the centroid position obtained by calculating the moving distance calculating means is a means for determining shorter or not than the lower limit distance d ₂ which is set in advance. Moving distance D of the center of gravity
If the lower limit distance determining means determines that the user is shorter than the preset lower limit distance d _2, it is assumed that the user does not move on the bed 11 and the time during which the user does not move is counted by the timer means. Can be.

The time measuring means calculates the moving distance D of the position of the center of gravity calculated by the moving distance calculating means as a predetermined lower limit distance d.
Shorter than ₂ from the time when the lower limit distance determination means determines a means for measuring the time until the moving distance D of the center of gravity position is determined is long and the lower limit distance determining means than the lower distance d _2. The time determining means is means for determining whether the time measured by the time measuring means is longer than a preset upper limit time h ₁ = 2h (time). Since the time the user does not stuck on the bed portion 11 is able to bedsores exceeds the upper limit time h _1, when counting the time measuring unit is long when the time determining means than the upper limit time h ₁ is determined And the third
The alarm means generates an alarm signal and the display alarm section 7 operates. Thus, the caregiver can go to the user and turn the user over to prevent floor rubbing.

The speed judging means calculates the moving speed (activity speed) AV at the center of gravity obtained by the moving speed calculating means as a preset upper limit speed av ₁ = 25.
This is a means for determining whether or not it is faster than cm / 0.6 seconds. It is very dangerous if the user suddenly takes an action such as standing up on the bed 11, for example. Therefore, if the moving speed AV of the position of the center of gravity is higher than the upper limit speed av ₁ , the speed determining means When the determination is made, the fourth alarm means generates an alarm signal and the display / alarm unit 7 operates. This allows the caregiver to go to and care for the user.

Next, the operation of the bed apparatus configured as described above will be described with reference to the flowcharts shown in FIGS. First, the power ON switch 16 is operated. Then, a function required according to the caregiver user is selected from a weight determination function, an upper limit distance determination function, a speed determination function, a center of gravity position determination function, and a lower limit distance determination function,
In order to operate the selected function, the corresponding switches from the first to fifth function selection switches 18a to 18e are set to O.
N is set (S100). Then, when the zero point correction switch 19 is turned on in a state where the user is not on the bed 11 (S102), the CPU of the controller 10 causes the CPU of the controller 10 to perform the first operation.
To zero correction of the fourth load detector 9 (S104). Thereafter, when measuring the weight of the user, when the user is placed on the bed 11, the CPU operates the multiplexer to switch the channel to which the first to fourth load detectors 9 are connected. It is allowed to sequentially measure the load signal W ₁ to _W-4 for each load detector 9 generates (S106). CPU
Determines whether the number n of the input load signals is four or more (S108), and when the number n of the input load signals is four or more and determines YES, the weight W _{T of the} user is determined.
(Weight on the bed 11), the coordinates of the center of gravity (X, Y), the activity level AD, and the activity speed AV are calculated (S110). However, activity level A
D is obtained after being obtained by calculating data of five moving distances D. The weight W _T of the user is determined by the controller 10
Is displayed on a display unit (not shown).

Next, a first function for selecting a weight determination function
It is determined whether or not the selection switch 18a is ON (S1).
12) If it is ON and determined to be YES, calculate
Obtained weight W_TThat is, the weight W on the bed 11_TBut
Set lower limit weight w ₁Determine if it is lighter than
(S114), the weight W on the bed 11_TIs the lower limit weight w
₁If the determination is lighter than YES, the fifth alarm means
Generates an alarm signal and installs it in the room where the caregiver is waiting
The displayed alarm unit 7 is activated (S220). this
As a result, the user got off the bed 11 and the bed
The device can be reported to a caregiver.

However, in step S112, the first
When the function select switch 18a of is determined to be NO is OFF, and in step S114, the weight W _T of the bed portion 11 has a lower limit weight w ₁ or more user bed section 1
When it is determined that the second function selection switch 18b is on the upper side, it is determined whether the next second function selection switch 18b is ON (S1).
16). Step S114 is a weight determination unit.

Next, it is determined whether or not the second function selection switch 18b for selecting the upper limit distance determination function is ON (S116). If it is ON and YES, it is obtained by calculation. activity level AD is determined whether longer than the upper limit distance ad ₁ which is set in advance (S
200), the activity level AD is the upper limit distance ad ₁
If the determination is longer than YES, the second warning means generates a warning signal and the display / warning section 7 operates (S22).
0). Thus, it is possible to notify the caregiver that the user is actively moving on the bed 11 and the bed apparatus.

However, in step S116, the second
When the function selecting switch 18b in is determined to be NO is OFF, and in step S200, when the activity level AD by the user at the upper limit distance ad ₁ less length is determined to be resting on the bed 11 Then, it is determined whether or not the next third function selection switch 18c is ON (S202). Step S200 is the upper limit distance determination means.

Next, it is determined whether or not the third function selection switch 18c for selecting the speed determination function is ON (S2).
02), when it is determined that an ON YES, it is determined whether the fast or not than the upper limit speed av ₁ the activity rate AV obtained by the operation is set in advance (S20
4), when the activity rate AV is determined to YES faster than the upper limit speed av ₁ includes a fourth display alarm unit 7 alarm means generates an alarm signal is activated (S220). Thus, it is possible to notify the caregiver that the user is performing a sudden action such as standing up on the bed 11 and the bed apparatus.

However, in step S202, the third
When the function select switch 18c of is determined to be NO is OFF, and in step S204, the activity rate AV is the maximum speed av ₁ less speed, determines that the user is at rest on the bed portion 11 At this time, it is determined whether or not the next fourth function selection switch 18d is ON (S206). Step S204 is the speed determination means.

Next, it is determined whether or not the fourth function selection switch 18d for selecting the center-of-gravity position determination function is ON (S206). When it is ON and YES, it is obtained by calculation. barycentric coordinates (X, Y) it is determined whether there is a pre have been set region R ₁ or R within ₂ (S20
8), the center coordinates (X, Y) is when it is determined that YES is within the region R ₁ or R _2, a first alarm means is display alarm unit 7 generates an alarm signal is activated (S220). Thereby, it is possible to notify the caregiver that the user has moved to the getting on / off section 14 or 15 of the bed section 11 and is, for example, sitting down or getting out of the bed section 11 and the bed apparatus.

However, in step S206, the fourth
When the function selecting switch 18d in is determined to be NO is OFF, and in step S208, when the center coordinates (X, Y) is determined to be outside the region R ₁ or R _2, following the fifth feature of It is determined whether or not the selection switch 18e is ON (S210). Step S208 is the center of gravity position determination means.

Next, it is determined whether or not the fifth function selection switch 18e for selecting the lower limit distance determination function is ON (S210). When it is ON and YES, it is obtained by calculation. moving distance D of the center of gravity, to determine longer or than the lower distance d ₂ which is set in advance (S21
2), when the moving distance D of the center-of-gravity position is determined to lower the distance d ₂ less in length NO, the time the user is not the to motionless regarded as not stuck on the bed portion 11 H The time is measured by the timer (S216). This timing means measures the time H during which the user does not move on the bed 11 until the moving distance D of the position of the center of gravity is longer than the lower limit distance d ₂ in step S212 and the determination is YES. when the answer is YES longer than the lower distance d ₂ is timed from zero original time H. And step S
218, the user determines whether shorter or not than the upper limit time h ₁ time not stuck on the bed portion 11 H has been set in advance, whether or upper limit time period H is equal to the upper limit time h ₁ when it is determined that longer NO than h _1, the display alarm unit 7 fourth warning means generates an alarm signal is activated (S220). Thus, the caregiver can go to the user and turn the user over to prevent floor rubbing. Then, in step S218, the time H
Is shorter than the upper limit time h ₁ , and when the determination is YES, the time keeping means continues to measure the time H and at step S10
4 and the calculation process is repeated in the same manner as described above.

As described above, according to the bed apparatus of the above embodiment, the user receiving the care does not need to notify the caregiver himself when he / she needs the care, and automatically detects the situation of the user. Thus, it is possible to specifically and automatically notify the caregiver of the situation of the user, for example, that the user is about to get off the bed 11 or the floor is about to be rubbed. As a result, it is possible to improve the service for the person receiving the care, and to reduce the labor of the caregiver for monitoring the person receiving the care.

This bed apparatus can be constructed by laying the first to fourth load detectors 9 under the respective legs 12 of the conventional bed 8, for example. Available and economical. In addition, the display alarm unit 7
For example, the display alarm unit 7 installed in a nurse's station (nurse station) in a hospital can be used. The display alarm unit 7 is connected to a nurse call switch provided for each bed in each room, and when a patient operates any of the nurse call switches, a display indicating the room and the bed is displayed. And an alarm sound can be generated. The nurse call receptacle 22 of the controller 10 of this embodiment is connected to a signal line to which the nurse call switch is connected together with a nurse call switch.

Further, the threshold value setting device 23 includes a table 1 and a table which are criteria for each of the weight determining means, the center of gravity position determining means, the upper limit distance determining means, the lower limit distance determining means, the speed determining means, and the time determining means. 6 and the threshold values w ₁ , (x ₁ , x ₂ , y ₁ ), ad ₁ ,
d ₂ , av ₁ , and h ₁ can be freely set according to the weight and medical condition of the user, the shape and structure of the bed 8, and the like.

However, in the above embodiment, the center of gravity calculating means, the moving distance calculating means, the moving speed calculating means, the weight determining means, the center of gravity determining means, the upper limit distance determining means, the lower limit distance determining means, the speed determining means, and the time The determining means includes first to first
Each calculation and determination was performed every 0.6 seconds required to complete the input of the load signal of the fourth load detector 9, but instead of this, 0.6 seconds × 2 = 1.2 seconds , Or 0.6 seconds × 3 = 1.8 seconds,..., Or a predetermined time, such as an irregular time, and the respective calculations and determinations may be performed. In the above embodiment, the weight determination function (weight determination means), the upper limit distance determination function (upper limit distance determination means), the speed determination function (speed determination means), the center of gravity position determination function (center of gravity position determination means), and the lower limit distance Although the configuration is provided with the five functions of the determination function (lower limit distance determination means and time determination means), a configuration in which desired functions among the five functions are combined may be employed.

In the above embodiment, as shown in FIG. 1, the load detectors 9a to 9d are respectively attached to the four legs 12.
However, the load detectors 9a to 9c are provided on any three of the four legs 12, and the three load signals generated by the three load detectors 9a to 9c are provided. Based on the above, a configuration having five weight determination functions, an upper limit distance determination function, a speed determination function, a center-of-gravity position determination function, and a lower limit distance determination function substantially equivalent to those of the above-described embodiment can be adopted. In this case, since the weight of the user on the bed 11 cannot be accurately measured, the weight of the user is input to the controller 10 in advance. However, in the case where the weight of the user is not input to the controller 10 in advance, the weight calculating means includes three load detectors 9a to 9c.
The total weight W _T of 9c load signal generated by calculating for each predetermined time, the weight determining means sets the amount of change in a decrease in the total weight W _T of the weight calculation section is obtained by calculating for each predetermined time in advance The fifth alarming means generates an alarming signal when the value becomes equal to or higher than _wx % (for example, 70%).

Next, the first to third load detectors 9a to 9c
The method by which the center-of-gravity position calculating means calculates the position of the center-of-gravity coordinates (X, Y) based on the load signal generated by the above will be described.
Here, when the user placed on the bed portion 11, when the amount of increase in the respective load signal first to third load detector 9a~9c by the weight of the user to produce a W ₁ to _W-3, The coordinates (X, Y) of the center of gravity of the user on the bed 11 can be calculated by the following equations (4) and (5).

X = (W ₁ + W ₂ ) · (1 / W _T ) · BX (4) Y = (W ₁ + W ₃ ) · (1 / W _T ) · BY (5) , X; coordinates in the X-axis direction with the origin O as the fourth leg 12 where the load detector 9 is not provided as shown in FIG. 4 (b). Y; FIG. 4 (b) with the origin as O. Coordinates in the Y-axis direction BX shown: distance between the legs 12 of the bed 8 in the X-axis direction BY: distance between the legs 12 of the bed 8 in the Y-axis direction. When the weight of the user is measured by the first to third load detectors 9a to 9c, the user is required to measure the bed 1 so that the weight is generated as (W ₁ + W ₂ + W ₃ ).
The weight may be applied to a predetermined edge or corner on the upper part 1. At this time, the weight calculating means can calculate the weight W _T = W ₁ + W ₂ + W ₃ to measure the weight. Alternatively, the weight of the user may be measured in advance by another weight scale, and the weight W _T may be set in the controller 10 by operating a setting unit (not shown).

As described above, by reducing the number of the load detectors 9 from four to three, the cost of the load detector 9 can be reduced correspondingly. The time required for the controller 10 to input the load signals generated by the first to third load detectors 9a to 9c is 0.15 seconds ×
3 = 0.45 seconds, and the first to fourth load detectors 9a to 9a to
Time to input 9d load signal 0.15 sec x 4 = 0.6
This is 3/4 of a second, and the moving speed calculating means can calculate a fast movement of the user on the bed 11. Thereby, danger to the user can be more reliably prevented than the bed apparatus of the above embodiment.

Further, in the above embodiment, the center-of-gravity position calculating means calculates the user's center-of-gravity coordinates (X,
Y), and the moving distance calculating means calculates the barycentric coordinates (X,
Y) is used to calculate the moving distance D of the user on the bed 11 according to the equation (3). Instead, the center-of-gravity position-related information calculation means uses the following formulas (12) and (13). Information P (X), P (Y) relating to the position of the center of gravity of the user by the formula
And the moving distance calculating means calculates the information P (X), P
(Y) may be used to calculate the moving distance D of the position of the center of gravity of the user on the bed 11 by the following equation (16). With this configuration, the moving distance D of the user on the bed 11 can be calculated by the first to third load detection without performing the calculation for obtaining the barycentric coordinates (X, Y) as in the above embodiment. vessel load signal W ₁ of 9a~9c, W _2, W ₃ barycentric location-related information including a P (X), it can be determined using the P (Y).

Next, the moving distance D is calculated and obtained (1
6) An explanation will be given to derive the equation. In FIG. 4A, the fourth load detector 9d is placed at the origin of the X and Y coordinates. The new origin O is obtained by moving the origin O shown in FIG. 4A in the minus direction of the X and Y axes by BX / 2 and BY / 2, respectively (see FIG. 4B). , (1),
X and Y in the formula (2) are respectively (X−BX / 2),
When (Y-BY / 2) and placed, (1) from _{equation, X = {(W 1 +} W 2 -W 3 -W 4) · (1 / W T) · (BX / 2)} + BX / 2 = _{(W 1 + W 2 -W 3} -W 4 + W 1 + W 2 + W 3 + W 4) · (1 / W T) · (BX / 2) = 2 (W 1 + W 2) · (1 / W T) · ( BX / 2) = (W ₁ + W ₂ ) · (1 / W _T ) · BX (6) Similarly, from equation (2), Y = (W ₁ + W ₃ ) · (1 / W _T ) · BY (7)

Here, the first to fourth load detectors 9a to 9 are calculated using the coordinates (X, Y) of the center of gravity of the weight W _T of the user.
Denoting a load signal _{W 1, W 2, W 3} , W 4 generating the _{d, W 1 = (X /} BX) · (Y / BY) · W T ··· (8) W 2 = (X / _{BX) · {(BY-Y} ) / BY} · W T ··· (9) W 3 = {(BX-X) / BX} · (Y / BY) · W T ·· (10) W 4 = a {(BX-X) / BX } · {(BY-Y) / BY} · W T ·· (11). P (X) = W ₁ + W ₂ , P (Y) = W ₁ + W ₃
In other words, P (X) = W ₁ + W ₂ = {(X · Y + X · BY−XY ·) / (BX · BY)} · W _T = (X / BX) · W _T (12) ) P (Y) = W ₁ + W ₃ = {(XY · Y · BY−XY ·) / (BX · BY)} · W _T = (Y / BY) · W _T (13) . X and Y are calculated from the equations (12) and (13) as follows: X = P (X) · (1 / W _T ) · BX (14) Y = P (Y) · (1 / W _T ) · BY (15) is derived. Here, X _K , Y _K , X in the equation (3)
The _{K-1, Y K-1} (14), (15) expressed using a _{formula, X K = P (X K} ) · (1 / W T) · BX Y K = P (Y K) · (1 / W _T ) ・ BY X _K-1 = P (X _K-1 ) ・ (1 / W _T ) ・ BX Y _K-1 = P (Y _K-1 ) ・ (1 / W _T ) ・ BY Becomes Substituting these into equation _{(3), D = (1 / W T} ) · _{^{[BX 2 · {P (X K}} ) -P (X K-1)} 2 + BY 2 · {P (Y K) - P (Y _K-1 )｝ ² ] ^1/2 (16)

As described above, the moving distance D of the user on the bed 11 between the two time points is P at the time point K-1.
(X), P (X _K-1 ), P (Y)
(Y _{K -1} ) and P (X _K ) and P (Y _K ) which are the values of P (X) and P (Y) at the time point K are obtained by substituting into equation (16). Can be. This (12), (1
The information P (X) and P (Y) relating to the position of the center of gravity of the user on the bed 11 is calculated by the equation 3) by the center of gravity position related information calculating means. The movement distance calculating means calculates the movement distance D of the position of the center of gravity of the user on the bed 11 by the expression (16) using the expression (16).
The moving speed calculating means can obtain the moving speed AV by dividing the moving distance D calculated by the moving distance calculating means by the time interval at which the moving distance D is measured. Although not described in detail, the activity level AD can be obtained using the moving distance D and the time interval at which the moving distance D is measured, as in the above-described embodiment. It is possible to perform predetermined determinations and measurement of time by distance determination means and the like.

Next, in the above embodiment, the center-of-gravity position calculating means calculates the center-of-gravity coordinates (X,
Y), and the center-of-gravity position determining means calculates the center-of-gravity coordinates (X,
User using Y) is has been the determining configure whether within the region R ₁ or R ₂ is previously set to the vicinity of the edge of the bed portion 11 shown in FIG. 5, Instead of this, the center-of-gravity position related information calculating means calculates the information P (X), P
(Y) calculates the center of gravity existing range judging means this information P (X), the user uses the P (Y) is within substantially the same range as region R ₁ or R ₂ shown in FIG. 5 It may be configured to determine whether or not. With this configuration, the determination user on the bed section 11 of whether or not within the range of about equal to the area R ₁ or R _2, the center of gravity coordinates as in the above embodiment (X, Y) Without performing the calculation for
Load signal W ₁ of the load detector 9a~9c, W _2, W barycentric location-related information P including the ₃ (X), may be performed using the P (Y).

Next, the center-of-gravity position existence range determining means will be described. The weight of the user W _T and the constant A (a value for allowing a margin in the criterion) are set as thresholds, and when P (Y) = W ₁ + W ₃ > W _T −A holds, the bed is set. When the part 11 is viewed from above, it can be determined that the user is approaching a line connecting the first load detector 9a and the third load detector 9c on the bed 11. When the user is on this line,
Total body weight the first and third load detector 9a, takes the 9c, the _{P (Y) = W 1 +} W 3 = W T. Also, P
(Y) When <A is satisfied, the user places a line on the bed 11 on the line connecting the second load detector 9b and the fourth load detector 9d when the bed 11 is viewed from above. It can be determined that they are approaching. When the user is located on this line, the total weight is the second and fourth load detectors 9b, 9
With respect to d, P (Y) = W ₁ + W ₃ = 0. Similarly, a constant B (a value for allowing a margin in the criterion) is set as a threshold value, and when P (X) = W ₁ + W ₂ > W _T -B holds, the bed 11 is moved upward. It can be determined that the user is approaching the line connecting the first load detector 9a and the second load detector 9b on the bed 11 as viewed from above. When the user is on this line,
Total body weight the first and second load detectors 9a, takes in 9b, the _{P (X) = W 1 +} W 2 = W T. Also, P
When (X) <B is satisfied, the user places a line on the bed 11 on the line connecting the third load detector 9c and the fourth load detector 9d when the bed 11 is viewed from above. It can be determined that they are approaching. When the user is positioned on this line, the total weight is equal to the third and fourth load detectors 9c, 9c.
In relation to d, P (X) = W ₁ + W ₂ = 0. Accordingly, the center-of-gravity position existence range determining means is a _{P (X)> W T -B} , and when it is determined that the P (Y)> W _T -A, the user on the bed section 11 in FIG. 5 it can be determined that in the region R ₂ and substantially equal range indicated (<and X,, Y> 20cm represented by XY coordinates described in the above embodiment 20cm in the range of). Then, the center-of-gravity position existence range determining means satisfies P (X)> W _T -B and P (Y) <A
When the user on the bed 11 is determined to be
Within area R ₁ and substantially equal as shown in (20 cm expressed in XY coordinates described in the above embodiment <X and,, Y <-2
0 cm). In this case, the user on the bed 11 is 20 cm <X and | Y |> 20 represented by the XY coordinates described in the above embodiment.
When in the range of cm, the center of gravity position existence range determining means is a _{P (X)> W T -B} , and P (Y)> W _T -
A or P (X)> W _T -B and P (Y) <A
Constants A and B are determined so as to determine

In the above embodiment, as shown in FIG.
As described above, the load detectors 9a to 9
d, but instead of this, four legs 1
A load detector (e.g.,
9a, 9c) may be provided. Center of gravity position performance
The calculating means generates the two load detectors 9a and 9c.
Two load signals W₁, W_ThreeBased on the center of gravity of the user
(X, Y) is calculated. And five of the above embodiments
Weight judgment function, upper limit distance judgment function, speed judgment function, center of gravity
The position judgment function and the lower limit distance judgment function
The corresponding processing can be performed using (X, Y).
You. However, the weight calculation means includes two load detectors 9a,
Total weight W of load signal generated by 9c_TEvery predetermined time
And the weight determining means determines that the weight calculating means
And the total weight W calculated by _TIs expected to change
Set w_x% (For example, 70%) or more
Then, the fifth alarm means generates an alarm signal.
In this case, in the above embodiment, the center-of-gravity position calculating means is
The coordinates (X, Y) of the center of gravity of the user are calculated by the equations (1) and (2).
The calculation is performed in place of this.
The step is the coordinates of the center of gravity of the user according to the equations (19) and (20).
(X, Y) is calculated. In this way, load detection
By reducing the number of instruments 9 from four to two,
The cost of the dispenser 9 can be reduced by that much,
The moving speed calculation means calculates the fast movement of the user on the bed 11.
Can be calculated.

Next, the center-of-gravity position calculating means calculates the center-of-gravity coordinates (X,
An explanation will be given for deriving the equations (19) and (20) obtained by calculating Y). Here, Q (X) = W ₁ / (W ₁ +
W ₃ ), from the equations (8) and (10), Q (X) = W ₁ / (W ₁ + W ₃ ) = X / BX. Therefore, X = Q (X) .BX (17) Similarly, if Q (Y) = W ₁ / (W ₁ + W ₂ ), then from the equations (8) and (10), Q (Y) = W ₁ / (W ₁ + W ₂ ) = Y / BY Become. Therefore, Y = Q (Y) .BY (18) Here, the expressions (15) and (17) are as follows: Y = P (Y) · (1 / W _T ) · BY = (W ₁ + W ₃ ) · (1 / W _T ) · BY (19) X = Q (X) · BX = {W ₁ / (W ₁ + W ₃ )} · BX (20) Therefore, the center-of-gravity position calculating means calculates (19),
Substituting the load signals W ₁ and W ₃ into the equation (20), the bed 11
The coordinates (X, Y) of the center of gravity of the user can be obtained. In this case, the weight W _T of the user may be measured in advance by another weight scale and stored in the storage unit,
By multiplying the load detectors 9a and 9c by the weight of the user, W _T = W
₁ + W ₃ may be stored in the storage unit determined by calculating the.

The center-of-gravity position calculating means calculates the center-of-gravity coordinates (X, Y) of the user on the bed 11 using the load signals W ₁ and W ₃ generated by the two load detectors 9 a and 9 c. Instead, the two load detectors 9a, 9
Bed 11 using load signals W ₁ and W ₂ generated by b
The coordinates of the center of gravity (X, Y) of the above user can be calculated and obtained. That is, the expressions (14) and (18) are as follows: X = P (X) · (1 / W _T ) · BX = (W ₁ + W ₂ ) · (1 / W _T ) · BX (21) Y = Q (Y) · BY = {W ₁ / (W ₁ + W ₂ )} · BY (22) Therefore, the center-of-gravity position calculating means calculates (21),
Substituting the load signals W ₁ and W ₂ into equation (22), the bed 11
The coordinates (X, Y) of the center of gravity of the user can be obtained. Although not shown in the drawings in the above embodiment,
A weight setting device, a display device for setting data and weight or a weight for each load sensor, a measured weight input key, and a storage key may be provided.

[0066]

According to the first aspect of the present invention, the center-of-gravity position calculating means can calculate the position of the center of gravity of the weight of the user on the bed, so that the position of the user on the bed is recognized. be able to. When the position on the bed of the user can be recognized, it is possible to determine whether or not the user is awake, and to predict the next action such as whether or not the user is going down from the bed. . Further, according to the fifth aspect, the center-of-gravity position-related information calculating means can calculate information relating to the center of gravity of the weight of the user on the bed, so that the user can determine the range of the position on the bed. Can be recognized. Therefore, by making it possible to recognize the position of the user who needs care on the bed at a place away from the bed apparatus, the caregiver can go to the user when care is needed. You can take care of yourself, and when you do not need care, you can do something other than care. As a result, the needs of the user who needs nursing care can be surely satisfied each time, and the caregiver does not need to be close to the user, thereby reducing the labor of the caregiver.

According to the second and sixth aspects of the invention, the moving distance calculating means can calculate the moving distance of the position of the center of gravity of the user on the bed, so that the distance the user has moved on the bed can be calculated. Can be recognized. If the user has moved a relatively long distance, it can be predicted that the user is awake, is about to leave the bed, or is about to stand on the bed, etc. ,
The caregiver can go to the user and care. In addition, when the distance the user has moved is relatively short, or when the user has not moved for a long time, it can be predicted that there is a danger of floor rubbing, and in this case, the caregiver goes to the user. It is possible to change the user's posture and turn over. In other words, it is difficult for the caregiver to immediately judge whether it is necessary to turn over just by looking at the caregiver, but since the caregiver can recognize the distance that the user has moved, It is possible to reliably determine whether or not it is necessary for the user to turn over, and the user who needs to turn over can be turned over. This prevents a user who does not need to be turned over from turning over, so that sleep is not hindered, and the caregiver's labor for turning over can be reduced.

According to the third and seventh aspects of the present invention, the moving speed calculating means can calculate the moving speed of the center of gravity of the user on the bed, so that the moving speed of the user on the bed can be calculated. Can be recognized. When the user's moving speed is relatively fast, the caregiver can predict that the user is awake, that he is trying to get up on the bed, or that he is moving away from the bed, etc. In this case, the caregiver can go to the user and care for him, thereby preventing the user from danger.

According to the fourth invention, the center-of-gravity position judging means, and according to the eighth invention, the center-of-gravity position existence range judging means, wherein the center of gravity position of the user on the bed is a predetermined area of the bed. Because it can be determined whether or not
For example, in a bed provided with a fence other than the boarding section for getting on and off the bed section, by setting the boarding section of the bed section to a predetermined area, the user can get off or try to get on the bed. The caregiver can surely recognize that there is.

According to the ninth aspect, the upper limit distance determination means automatically determines whether or not the moving distance of the center of gravity of the user on the bed is longer than a predetermined upper limit distance. Does not need to determine whether or not it is necessary to care for the user based on the moving distance, and can provide appropriate care. In other words, for example, when caring for a large number of elderly people, the degree of movement on the bed differs for each elderly person, so setting the upper limit distance according to the degree of movement of each elderly person makes it extremely effective for many elderly people. Can be cared for.

According to the tenth aspect, the lower limit distance determining means automatically determines whether or not the moving distance of the center of gravity of the user on the bed is shorter than a predetermined lower limit distance.
There is no need for the caregiver to determine whether or not the user needs to turn over based on the travel distance, and the caregiver can turn over appropriately. According to the eleventh aspect, the speed determination means automatically determines whether or not the moving speed of the position of the center of gravity of the user on the bed is higher than a predetermined upper limit speed. It is not necessary to judge whether or not the user needs to be cared based on the information, and the car can be properly cared for.

According to the twelfth and thirteenth aspects, when the position of the center of gravity of the user on the bed is in the predetermined area near the edge of the bed or in the vicinity thereof, the first alarm means issues the alarm signal. According to the fourteenth aspect, the second alarm means is provided when the moving distance of the center of gravity of the user on the bed or the total moving distance of two or more moving distances is longer than a predetermined upper limit distance. Generates an alarm signal. According to the fifteenth aspect, when the moving distance of the center of gravity of the user on the bed is shorter than a predetermined lower limit distance, the third alarm means generates an alarm signal. Then, when the moving speed of the position of the center of gravity of the user on the bed is higher than a predetermined upper limit speed, the fourth alarm means generates an alarm signal. This eliminates the need for the caregiver to continuously monitor the position of the center of gravity of the user on the bed, and can reduce the labor of the caregiver. Therefore, in a hospital, a facility, or a nursing home that uses a large number of bed devices, a relatively small number of caregivers can efficiently provide care for a large number of elderly or other users.

According to the sixteenth aspect, since the lower limit distance determining means determines that the user on the bed has moved only a shorter distance than the predetermined lower limit, the user is longer than the predetermined lower limit. The time counting means measures the time until it is determined that the distance has been moved, and when the time determining means determines that the time counted by the timer is longer than the upper limit time,
Alarm means generates an alarm signal. This makes it possible to monitor whether or not the user on the bed has moved so as not to rub the floor based on both the moving distance and the time.

The eighteenth invention is directed to the twelfth, fourteenth and first aspects.
The nineteenth invention is a combination of the five inventions, and the nineteenth invention is a combination of the thirteenth, fourteenth, and fifteenth inventions. According to the twentieth aspect, the weight on the bed portion, for example, the weight of the user can be calculated by the weight calculation means, so that the weight can be managed while the user is on the bed portion. The burden of measuring the weight of the caregiver and the caregiver can be reduced. Then, when the weight on the bed is lower than a predetermined lower limit weight, the fifth alarming means generates an alarm signal to notify the caregiver that the user has got off the bed. . This makes it possible to prevent the user, for example, the elderly with dementia, from wandering. Further, the load detecting means can be used for both the care of the user and the weight measurement, which is economical.

According to the twenty-first aspect, the center-of-gravity position calculating means or the center-of-gravity position-related information calculating means calculates the center of gravity of the weight of the user on the bed based on the load signals generated by the load detecting means provided at three places. Since the position or the center-of-gravity position-related information is calculated, the load signal can be read in a reading time of 3/4 as compared with a case where the load detecting means is provided on each of the four legs of the bed, for example. Thus, the movement of the position of the center of gravity of the user on the bed can be precisely measured, and the possibility of avoiding an unexpected situation can be increased. In addition, since the number of measurement circuits can be reduced by reducing the number of load detectors, the manufacturing cost can be reduced. According to the twenty-second aspect, the center-of-gravity position calculating means or the center-of-gravity position-related information calculating means calculates the center of gravity or the center of gravity of the weight of the user on the bed based on the load signals generated by the load detecting means provided at two places. Since the position-related information is calculated, the load signal can be read in 2/4 reading time, as compared with a case where load detecting means is provided on each of the four legs of the bed, for example. The movement of the position of the center of gravity of the user on the bed can be precisely measured, and the possibility of avoiding an unexpected situation can be increased. In addition, since the number of measurement circuits can be reduced by reducing the number of load detectors, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bed apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit of the bed apparatus according to the embodiment.

FIG. 3 shows a controller of the bed apparatus according to the embodiment, wherein (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 4A shows X, Y coordinates on the bed of the bed apparatus according to the embodiment, and FIG. 4B shows X, Y coordinates on the bed of the bed apparatus according to another embodiment. FIG.

FIG. 5 is a perspective view showing an area where the first alarm means generates an alarm signal on the bed of the bed apparatus according to the embodiment;

FIG. 6 is a flowchart showing an operation procedure of the bed apparatus according to the embodiment.

FIG. 7 is a flowchart showing an operation procedure of the bed apparatus according to the embodiment.

FIG. 8 is a perspective view showing a conventional bed apparatus.

[Explanation of symbols]

7 display alarm section 8 bed 9 (9a to 9d) load detector 10 the controller 11 bed unit 23 threshold value setting device R _1, the region of R ₂ landing section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motoyuki Adachi 5-2-22, Tea Garden, Akashi-shi, Hyogo Daiwa Seizo Co., Ltd. (72) Inventor Tohru Takahashi 5-22, Tea Garden, Akashi, Hyogo No. Daiwa Seizo Co., Ltd.

Claims (19)

[Claims] 1. A bed and three load detecting means for detecting a load applied to a bed of the bed to generate a load signal,
A bed position calculating means for calculating a position of a center of gravity of a user's weight on the bed based on the load signals generated by the three load detecting means. 2. A bed and two load detecting means for detecting a load applied to the bed of the bed and generating a load signal,
A bed position calculating means for calculating a position of the center of gravity of the weight of the user on the bed based on the load signals generated by the two load detecting means. 3. The bed apparatus according to claim 1, wherein the center of gravity calculated by the center-of-gravity position calculating means is located in a predetermined area of the bed. A bed apparatus comprising a position determining unit. 4. A bed, load detecting means for detecting a load applied to the bed of the bed and generating a load signal, and calculating a center of gravity of a user's weight on the bed based on the load signal. A coordinate value X, Y of the center-of-gravity position coordinates X, Y obtained by the calculation by the center-of-gravity position calculating means. A bed apparatus comprising: a center-of-gravity position determining unit that determines whether the threshold value is within a threshold value; and a threshold value setting device for setting an appropriate threshold value. 5. A bed, load detecting means for detecting a load applied to a bed of the bed and generating a load signal, and a center of gravity of a user's weight on the bed based on the load signal. A center-of-gravity position-related information calculating means for obtaining information by calculation, wherein the information related to the center of gravity position is obtained by adding the load signal, and the coordinates of the center of gravity position X and Y
A bed function, wherein the center-of-gravity position-related information calculating means obtains the center-of-gravity position-related information by calculation at predetermined time intervals. 6. The bed apparatus according to claim 5, further comprising a moving distance calculating means for calculating a moving distance of the center of gravity based on information obtained by the calculation by the center of gravity related information calculating means. A bed apparatus characterized by the following. 7. The bed apparatus according to claim 5, further comprising a moving speed calculating means for calculating a moving speed of the center of gravity based on the information obtained by the calculation by the center of gravity related information calculating means. A bed apparatus characterized by the following. 8. The bed apparatus according to claim 5, wherein the range of the center of gravity obtained based on the information calculated by the center-of-gravity-position-related information calculating means is a predetermined range of the bed. A bed apparatus comprising: a center-of-gravity position existence range determining unit that determines whether or not the subject is in an area. 9. The couch device according to claim 6, wherein the moving distance of the position of the center of gravity calculated by the moving distance calculating means is determined to be longer than a predetermined upper limit distance. A bed apparatus comprising a determination unit. 10. The bed apparatus according to claim 6, wherein
A bed apparatus comprising lower limit distance determining means for determining whether the moving distance of the position of the center of gravity obtained by the moving distance calculating means is shorter than a predetermined lower limit distance. 11. The bed apparatus according to claim 7, wherein
A bed apparatus comprising speed determination means for determining whether or not the movement speed of the position of the center of gravity obtained by the movement speed calculation means is higher than a predetermined upper limit speed. 12. The bed apparatus according to claim 3, wherein the center-of-gravity position calculated by the center-of-gravity position calculating means is in a predetermined area near an edge of the bed or in the vicinity thereof. A bed apparatus comprising first alarm means for generating an alarm signal when the means determines. 13. The bed apparatus according to claim 8, wherein
An alarm signal is issued when the center-of-gravity position existence range determining means determines that the range in which the center-of-gravity position calculated by the center-of-gravity position-related information calculating means exists is within a predetermined area near the edge of the bed or in the vicinity thereof. A first alarm means for generating a bed. 14. The bed apparatus according to claim 9, wherein
Generating an alarm signal when the upper limit distance determining means determines that the moving distance of the center of gravity position calculated by the moving distance calculating means or the total moving distance of two or more moving distances is longer than a predetermined upper limit distance. A bed apparatus comprising the second alarm means. 15. The bed apparatus according to claim 10, wherein when the lower limit distance determining means determines that the moving distance of the position of the center of gravity calculated by the moving distance calculating means is shorter than a predetermined lower limit distance. A bed apparatus comprising a third alarm unit for generating a signal. 16. The bed apparatus according to claim 10, wherein the lower limit distance determining means determines that the moving distance of the position of the center of gravity calculated by the moving distance calculating means is shorter than a predetermined lower limit distance. Timer means for measuring the time until the lower limit distance determination means determines that the movement distance of the center of gravity is longer than a predetermined lower limit distance, and whether the time measured by the timer means is longer than a predetermined upper limit time And a third alarming means for generating an alarm signal when the time determining means determines that the time measured by the time measuring means is longer than the upper limit time. Bed device. 17. The bed apparatus according to claim 11, wherein the speed determining means determines that the moving speed of the position of the center of gravity calculated by the moving speed calculating means is higher than a predetermined upper limit speed. A bed apparatus comprising: a fourth alarm unit that generates a signal. 18. The bed apparatus according to any one of claims 1 to 17, wherein the weight calculating means calculates a weight applied on the bed based on the load signal, and the weight calculating means comprises: A bed apparatus comprising: a fifth alarm unit that generates an alarm signal when the weight on the bed obtained by calculation is smaller than a predetermined lower limit weight. 19. The bed apparatus according to any one of claims 4 to 18, wherein the load detecting means comprises:
A bed apparatus, wherein a load applied to the bed is detected at three or two places.