JP2008264338A - On-bed sensing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-bed sensing method for reliably sensing that a person is on a bed floor part. <P>SOLUTION: The on-bed sensing method includes the load sensing process for sensing loads respectively applied on a plurality of regions mutually spaced out on the bed floor part 21 by a plurality of load sensing means 3 corresponding to each of the regions, the total load value determining process for determining whether the total load value obtained by summing up a plurality of load values output from the plurality of load sensing means 3, the breathing determining process for determining whether breath of a person H is detected from at least a load value out of the plurality of load values output from the plurality of load sensing means 3, and the on-bed determining process for determining that the person H is on the bed floor part 21 when the total load value is determined to be equal to or greater than a first threshold value in the total load value determining process, and the breath of the person H is determined to be detected in the breathing determining process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bed occupancy detection method, an occupancy detection device, and an occupancy monitoring system for detecting that a person is present on a bed sleeping portion.

  As a bed user who can detect whether a sick person, an elderly person, a guest, etc. are present on the bed part of a bed used in medical facilities, elderly facilities, hotels, etc. For example, what is disclosed in Japanese Patent No. 2868658 is known (see Patent Document 1).

The bed disclosed in this publication obtains a difference weight between a weight acting on the leg portion of the bed and a predetermined reference weight, and when the difference weight exceeds a predetermined determination weight, the bed bed portion It is configured to output a human body detection signal indicating that there is a person on the (bed body).
Japanese Patent No. 2868658 (Claim 1)

  Therefore, in the above bed, a human body detection signal is output when the difference weight exceeds the determination weight regardless of whether the person lying on the bed bed is a person or an object. The human body detection signal is output even when an object, not a person, is present on the bed bed.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to detect a bed occupancy, which can reliably detect that a person is on the bed lie, and the detection. An object of the present invention is to provide a bed detection apparatus and a bed bed monitoring system that can be suitably used in a method.

  The present invention provides the following means.

[1] A load detection step of detecting a load applied to each of a plurality of spaced apart portions of the bed bed by a plurality of load detecting means corresponding to each portion;
A total load value determination step of determining whether or not a total load value obtained by summing a plurality of load values output from the plurality of load detection means is equal to or greater than a predetermined first threshold;
A breath determination step of determining whether or not human breathing can be detected based on at least one of the plurality of load values output from the plurality of load detection means;
When it is determined in the total load value determination step that the total load value is greater than or equal to the first threshold value and it is determined in the respiration determination step that human respiration can be detected, a person is present on the bed bed. A presence determination step for determining that the
A bed presence detection method comprising a bed detection step including:

  [2] The bed occupancy detection method according to item 1, wherein the respiration determination step is performed after the total load value is determined to be equal to or greater than a first threshold value in the total load value determination step.

[3] The presence detection step includes
When it is determined in the total load value determination step that the total load value is equal to or greater than the first threshold, the first continuation is performed to determine whether or not the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. Including a time determination process,
In the presence determination step, when it is determined in the first duration determination step that the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more, there is a person on the bed sleeping portion. 3. The bed presence detection method according to item 1 or 2, wherein the bed is determined to be floored.

[4] The presence detection step includes
A variation amount determination step of determining whether or not the variation amount per predetermined time of each load value is equal to or less than a predetermined second threshold value;
In the presence determination step, when it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or less than a second threshold value, a person is present on the bed sleeping portion. The bed presence detection method according to any one of items 1 to 3 described above.

  [5] The bed occupancy detection method according to item 4, wherein the respiration determination step is performed after the variation amount per predetermined time of the load value is determined to be equal to or less than a second threshold value in the variation amount determination step.

[6] The presence detection step includes
When it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value, the state where the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value is a predetermined time. Including a second duration determination step for determining whether or not it is continuing,
When the presence determination step further determines that the state in which the variation amount per predetermined time of each load value is equal to or less than the second threshold is continued for a predetermined time or more in the second duration determination step, 6. The bed presence detection method according to 4 or 5 above, wherein it is determined that a person is present on the bed portion.

[7] The presence detection step includes
Calculating a center of gravity position of a person on the bed bed based on the plurality of load values, and including a center-of-gravity position determination step for determining whether the center of gravity position is in a predetermined sleeping area of the bed bed;
In the above-described bed determination step, when it is determined in the barycentric position determination step that the barycentric position is in the sleeping area of the bed sleeping portion, it is determined that a person is present on the bed sleeping portion. The bed presence detection method according to any one of claims 6 to 6.

  [8] The bed occupancy detection method according to [7], wherein the respiration determination step is performed after it is determined in the gravity center position determination step that the gravity center position is in the sleeping region of the bed sleeping portion.

[9] The presence detection step includes
When it is determined in the center of gravity position determination step that the center of gravity position is in the sleeping area of the bed bed portion, it is determined whether or not the state where the center of gravity position is in the sleeping area of the bed bed portion has continued for a predetermined time or longer. Including a duration determination step,
In the presence determination step, when it is determined in the third duration determination step that the center of gravity is in the sleeping region of the bed bed portion for a predetermined time or longer, a person is placed on the bed bed portion. 9. The bed occupancy detection method according to item 7 or 8 described above, which is determined to be occupying the bed.

[10] The presence detection step includes
The presence of the bed according to any one of the preceding items 1 to 9, which includes a notification step of notifying information to that effect when it is determined in the presence determination step that a person is present on the bed sleeping portion. Floor detection method.

[11] The presence detection step includes
The presence of the bed according to any one of the preceding items 1 to 10, which includes a communication step of transmitting information to that effect when it is determined in the presence determination step that a person is present on the bed sleeping portion. Floor detection method.

  [12] In the above-described bed presence determination step, when it is determined that a person is present on the bed bed portion, the step 1 to start the bed removal information detection step of detecting information related to the person's bed removal on the bed bed portion The bed presence detection method according to any one of 11.

  [13] The bed occupancy detection method according to any one of items 1 to 12, wherein the occupancy detection step is repeated every predetermined time.

[14] A plurality of load detecting means for detecting loads applied to a plurality of mutually separated parts of the bed bed,
Total load value determining means for determining whether or not a total load value obtained by summing a plurality of load values output from the plurality of load detecting means is equal to or greater than a predetermined first threshold;
Respiration determination means for determining whether or not human respiration can be detected based on at least one load value among the plurality of load values output from the plurality of load detection means;
When it is determined by the total load value determining means that the total load value is greater than or equal to the first threshold value and it is determined by the respiration determining means that a person's breathing can be detected, a person is present on the bed sleeping portion. Occupancy determination means for determining that
An in-bed detection device comprising: an in-bed detection means including:

  [15] The respiration determining unit is configured to determine whether or not human respiration can be detected after the total load value determining unit determines that the total load value is equal to or greater than a first threshold value. The bed presence detection device according to the description.

[16] The presence detection means includes
When the total load value is determined to be greater than or equal to the first threshold by the total load value determination means, the first continuation is performed to determine whether or not the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. Including time determination means,
The occupancy determining means further determines that there is a person on the bed sleeping portion when the first duration determining means determines that the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. 16. The bed occupancy detection device according to item 14 or 15 described above, which is determined to be flooring.

[17] The presence detection means includes:
A variation amount determining means for determining whether or not the variation amount per predetermined time of each load value is equal to or less than a predetermined second threshold;
The occupancy determination means further has a person lying on the bed sleeping portion when the fluctuation amount determination means determines that the fluctuation amount of each load value per predetermined time is equal to or less than a second threshold value. The bed presence detection device according to any one of Items 14 to 16, which is determined as follows.

  [18] The respiration determining unit determines whether or not the human respiration can be detected after the variation determining unit determines that the variation per predetermined time of each load value is equal to or less than a second threshold value. 18. The bed occupancy detection device according to item 17 above.

[19] The presence detection means includes:
When the variation amount determining means determines that the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value, the state where the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value is a predetermined time. Including a second duration determination means for determining whether or not it is continuing,
When the presence determination means further determines that the state in which the variation amount per predetermined time of each load value is less than or equal to the second threshold value continues for a predetermined time or longer by the second duration determination means, 19. The bed occupancy detection device according to item 17 or 18, wherein it is determined that a person is present on the bed portion.

[20] The bed detection means includes:
Calculating a center of gravity position of a person on the bed bed based on the plurality of load values, and including a center-of-gravity position determination means for determining whether the center of gravity position is in a predetermined sleeping area of the bed bed section;
The occupancy determining means further determines that a person is present on the bed sleeping portion when the centroid position determining means determines that the centroid position is in the sleeping area of the bed sleeping portion. 20. The bed presence detection apparatus according to any one of items 14 to 19.

  [21] The above item 20, wherein the breath determination unit determines whether or not a person's breath can be detected after the barycentric position determination unit determines that the barycentric position is in the sleeping region of the bed. The bed presence detection device according to the description.

[22] The presence detection means includes
When the center-of-gravity position determination means determines that the center-of-gravity position is in the sleeping area of the bed sleeping portion, it is determined whether or not the state where the gravity center position is in the sleeping area of the bed sleeping portion continues for a predetermined time or more. Including duration determination means,
In the case where the third continuation time determination unit determines that the state where the center of gravity is in the sleeping region of the bed bed portion continues for a predetermined time or longer, the presence determination unit determines whether the person is on the bed bed portion. The bed presence detection device according to the above item 20 or 21, which is determined to be present.

[23] The presence detection means includes
The presence of the bed according to any one of the preceding items 14 to 22, which includes notification means for notifying the information when the presence determination means determines that a person is present on the bed sleeping portion. Floor detector.

[24] The presence detection means includes:
The presence of the bed according to any one of the above items 14 to 23, including communication means for transmitting information to that effect when the presence determination means determines that a person is present on the bed sleeping portion. Floor detector.

  [25] In the case where the presence determination means determines that a person is present on the bed sleeping portion, the processing by the leaving information detection device that detects information related to the person leaving the bed lying on the bed sleeping portion is started. The bed presence detection apparatus according to any one of claims 14 to 24.

  [26] The bed presence detection apparatus according to any one of items 14 to 25, wherein the processing by the presence detection means is repeated every predetermined time.

[27] A plurality of load detection means for detecting loads applied to a plurality of spaced apart portions of the bed bed,
Total load value determining means for determining whether or not a total load value obtained by summing a plurality of load values output from the plurality of load detecting means is equal to or greater than a predetermined first threshold;
Respiration determination means for determining whether or not human respiration can be detected based on at least one load value among the plurality of load values output from the plurality of load detection means;
When it is determined by the total load value determining means that the total load value is greater than or equal to the first threshold value and it is determined by the respiration determining means that a person's breathing can be detected, a person is present on the bed sleeping portion. Occupancy determination means for determining that
When it is determined by the presence determination means that a person is present on the bed sleeping portion, notification means for notifying information to that effect;
A bed occupancy monitoring system comprising occupancy detection means including a bed.

  The present invention has the following effects.

  According to the invention of [1], the total load value determination step determines whether or not the total load value obtained by summing the plurality of load values output from the plurality of load detection means is equal to or greater than a predetermined first threshold value. Therefore, in this total load determination step, whether a person is present on the bed sleeping portion or a relatively light object (eg, luggage) or a small animal (eg, cat, dog) that is not a person and is less than the first threshold value. Etc. can be discriminated.

  The respiration determination step determines whether or not human respiration can be detected based on at least one load value among the plurality of load values output from the plurality of load detection means.

  In the presence determination step, when it is determined in the total load value determination step that the total load value is equal to or greater than the first threshold value, that is, there is no relatively light object or small animal on the bed sleeping portion. If it is determined, and it is determined that the person's breathing can be detected in the breath determination step, it is determined that the person is present on the bed sleeping portion. It is possible to reliably detect that a person is on the bed.

  According to the invention of [2], in the breath determination step, after the total load value is determined to be greater than or equal to the first threshold value in the total load value determination step, that is, a relatively light object or small animal on the bed bed. Therefore, it is possible to more reliably detect that a person is present on the bed sleeping portion.

  According to the invention of [3], in the first duration determination step, when it is determined in the total load value determination step that the total load value is not less than the first threshold value, the total load value is not less than the first threshold value. Is determined whether or not continues for a predetermined time or more.

  In the presence determination step, if it is determined in the first duration determination step that the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or longer, there is a person on the bed sleeping portion. Since it is determined that the person is on the floor, according to the present invention, it is possible to more reliably detect that a person is present on the bed sleeping portion.

  According to the invention of [4], the fluctuation amount determining step determines whether or not the fluctuation amount per predetermined time of each load value is equal to or less than a predetermined second threshold value. It is possible to determine whether a person's body movement per predetermined time on the bed is small or large. Thereby, for example, it is possible to determine whether a person is moving on the bed sleeping portion from the end portion to the sleeping area in the center or has already reached the sleeping area. That is, when a person is present on the bed bed for the purpose of going to bed or the like, the person tries to move from the end of the bed bed to the sleeping area in the center. When the is moving, the human body movement per predetermined time is large, so that the amount of variation per predetermined time of each load value exceeds the second threshold. Then, when the person reaches the sleeping area of the bed sleeping portion, the person's body movement per predetermined time becomes small, so that the amount of variation per predetermined time of each load value becomes equal to or less than the second threshold value. In other words, if it is determined that the amount of fluctuation per load time per predetermined time is less than or equal to the second threshold, it is assumed that the person has reached the sleeping area of the bed bed for the purpose of sleeping or the like Can do.

  In the presence determination step, when it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or less than the second threshold value, that is, when the human body movement per predetermined time is small. If it is determined, since it is determined that a person is present on the bed sleeping portion, according to the present invention, it is further determined that the person is present on the bed sleeping portion for the purpose of sleeping or the like. It can be detected reliably.

  According to the invention of [5], in the breath determination step, after it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or less than the second threshold value, that is, per human predetermined time. Since it is performed after it is determined that the body movement is small, in this breath determination step, the determination is performed more accurately than when it is determined whether or not the person's breath can be detected when the body movement is large. be able to. Therefore, according to the present invention, it is possible to more reliably detect that a person is present on the bed sleeping portion.

  According to the invention of [6], in the second duration determination step, when it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or less than the second threshold value, the predetermined value of each load value is determined. It is determined whether or not the state in which the fluctuation amount per time is equal to or less than the second threshold continues for a predetermined time or more.

  When the presence determination step further determines that the state in which the amount of variation per predetermined time of each load value is equal to or less than the second threshold is continued for a predetermined time or more in the second duration determination step, Since it is determined that a person is present on the bed part, according to the present invention, it is possible to more reliably detect that a person is present on the bed bed part.

  According to the invention of [7], the center-of-gravity position determination step calculates a center-of-gravity position of a person on the bed bed based on a plurality of load values, and whether the calculated position is in a predetermined sleeping area of the bed bed section. Determine whether or not.

  In the bed determination step, if it is determined that the center of gravity position is in the sleeping area of the bed bed portion in the center of gravity position determination step, it is determined that a person is on the bed bed portion. According to the invention, it is possible to more reliably detect that a person is present on the bed sleeping portion.

  According to the invention of [8], since the breath determining step is performed after it is determined in the barycentric position determining step that the barycentric position is in the sleeping area of the bed sleeping portion, a person is present on the bed sleeping portion. It can be detected more reliably.

  According to the invention of [9], in the third continuation time determination step, it is determined whether or not the state where the centroid position is in the sleeping region of the bed bed portion continues for a predetermined time or more in the centroid position determination step.

  Further, in the presence determination step, when it is determined in the third continuation time determination step that the state where the center of gravity is in the sleeping region of the bed sleeping portion has continued for a predetermined time or longer, a person is placed on the bed sleeping portion. Since it determines with being in bed, according to this invention, it can detect still more reliably that the person is on the bed sleeping part.

  According to the invention of [10], information indicating that a person is present on the bed sleeping portion can be notified to the notification target person.

  According to the invention of [11], information indicating that a person is present on the bed sleeping portion can be transmitted.

  According to the invention of [12], the bed leaving information detecting step can be started based on the determination result that the person is surely present on the bed sleeping portion.

  According to the invention of [13], the occupancy detection step can be repeated every predetermined time.

  According to the inventions [14] to [26], it is possible to provide a bed occupancy detection device that can be suitably used in the bed occupancy detection method according to the inventions [1] to [13].

  According to the invention [27], it is possible to monitor that a person is present on the bed sleeping portion.

  Next, an embodiment of the present invention will be described below with reference to the drawings.

  In FIG. 1, (1) is a bed presence detection apparatus according to an embodiment of the present invention, and (20) is a bed.

  The bed (20) is used in medical facilities (eg, hospitals), elderly facilities, nursing homes, nursing homes, hotels, general households, etc., in hospital rooms, examination rooms, examination rooms, guest rooms, bedrooms, etc. It is installed on a bed installation surface (23) consisting of a floor surface. As shown in FIG. 2, the bed (21) of the bed (20) has a rectangular shape in plan view.

  Here, in this specification, as shown in FIG. 2, in the state where the person (bed user) (H) goes to bed in a supine posture on the bed bed (21), the head side of the person (H) The head side of the bed part (21), the foot side of the person (H) is "the foot side of the bed bed part (21)", the right side of the person (H) is "the right side of the bed bed part (21)", and the person The left side of (H) is referred to as “the left side of the bed bed (21)”.

  As shown in FIG. 1, the bed (20) has four legs that horizontally support the bed (21) at a predetermined height, that is, a head-side right leg (22a) and a head-side left leg. It has a portion (22b), a foot side right leg portion (22c), and a foot side left leg portion (22d). Further, a rotatable bed moving caster (23) is provided at the lower end of each leg. In the present invention, the caster (23) is not necessarily provided at the lower end of each leg.

  On this bed sleeping part (21), as a bed user, a sick person, a patient with dementia, an elderly person, a healthy person, an infant, a guest, etc. (H) sleep, rest, recuperation, medical examination, examination, etc. For various reasons.

  In the present invention, the bed (20) is not limited to being a bed for sleeping or resting, but may be an examination table, an examination table, a stretcher, a sofa, or the like.

  As shown in FIG. 1, the bed occupancy detection device (1) according to the present embodiment detects that a person (H) is present on the bed sleeping portion (21), and further to that effect. This information is communicated or notified, and is provided with a presence detection means (2).

  As shown in FIGS. 1 to 3, the occupancy detection means (2) includes first to fourth load detection means (3) (3) (3) (3), a control device (4), and first communication. Means (7), determination device (8), second communication means (15), notification means (16) and the like are included.

  The first to fourth load detection means (3), (3), (3), and (3) are a plurality of parts separated from each other in the bed bed part (21), the right side of the head side of the bed bed part (21), the head The load applied to the left side of the foot, the right side of the foot and the left side of the foot, more specifically, the load applied to the right side of the head of the bed bed (21), the left side of the head, the right side of the foot and the left side of the foot , Each of them is continuously detected every predetermined time.

  The first load detection means (3) is disposed between the caster (23) of the head-side right leg (22a) of the bed bed (21) and the bed installation surface (24). The second load detecting means (3) is disposed between the caster (23) of the head-side left leg (22b) of the bed bed (21) and the bed installation surface (24). The third load detection means (3) is disposed between the caster (23) of the foot side right leg (22c) of the bed bed (21) and the bed installation surface (24). The fourth load detection means (3) is disposed between the caster (23) of the foot side left leg (22d) of the bed bed (21) and the bed installation surface (24).

  Each load detection means (3) is comprised from the commercially available load detector, for example, is comprised from the load cell which has a distortion cage etc.

  The number of load detections per second by each load detection means (3) is preferably set to 2 times / s or more, and more preferably 4 times / s to 100 times / s. However, in the present invention, the number of load detections per second by each load detection means (3) is not limited to the above range.

  In this embodiment, from each load detection means (3), a voltage corresponding to the magnitude of the load applied to each part of the bed bed (21) is output as a load value.

  The control device (4) controls a voltage as a load value output from each load detection means (3), and includes an amplification means (5) and an analog-digital conversion means (A / D conversion means) (6 ). The control device (4) is attached to any one of the first to fourth load detection means (3) (3) (3) (3).

  The amplification means (5) amplifies the voltage as the load value output from each load detection means (3). The analog-digital conversion means (6) converts the voltage amplified by the amplification means (5) from an analog signal to a digital signal.

  The first communication means (7) uses the voltage (digital signal) converted by the analog-digital conversion means (6) as a load value controlled by the control device (4), and converts the voltage (digital signal) into a telephone line network, the Internet, a wired LAN, The data is transmitted to the determination device (8) via a predetermined wired communication network such as a wireless LAN or a wireless communication network, and is attached to the control device (4). This first communication means (7) comprises a modem or the like.

  The determination device (8) determines whether or not the person (H) is present on the bed sleeping portion (21), for example, a place where the person to be notified is present (eg, monitoring room, nurse station). Or installed in a mobile phone (including a PHS machine, the same shall apply hereinafter). In addition, (8a) is a receiving antenna which receives the signal output from the 1st communication means (7).

  As shown in FIG. 3, the determination device (8) includes total load value determination means (9), fluctuation amount determination means (10), center of gravity position determination means (11), duration determination means (12), breath determination Means (13), occupancy determination means (14), storage means (not shown), etc. are provided, and it is constituted by a computer having ROM, RAM and other memories, CPU and the like.

  The storage means includes a program necessary for detecting that a person (H) is present on the bed bed (21), numerical values (first threshold, second threshold, etc.), bed bed (21 ) Is set and stored in advance, and data necessary for the process is stored as needed during the detection process.

  The total load value determining means (9) includes a load of only the bed (20) as a tare from the four load values output from the first to fourth load detecting means (3) (3) (3) (3). A tare subtraction processing unit (not shown) for performing a tare subtraction process for subtracting the value is attached. The total load value determination means (9) determines whether or not the total load value WS obtained by adding up the four load values after the tare processing is performed by the tare processing unit is equal to or greater than a predetermined first threshold value T1. This is a judgment.

  Here, the load values output from the first to fourth load detection means (3), (3), (3) and (3) are W1, W2, W3 and W4, respectively, and the first to fourth load detection means (3 ) (3) When the voltages output from (3) and (3) are V1, V2, V3 and V4, respectively, W1, W2, W3 and W4 are calculated by the following equations (a) to (d), respectively. The The total load WS is calculated by the following equation (e).

W1 = a1 × V1 + b1 Formula (a)
W2 = a2 × V2 + b2 Formula (b)
W3 = a3 × V3 + b3 Formula (c)
W4 = a4 × V4 + b4 Formula (d)
WS = W1 + W2 + W3 + W4 Formula (e)

However,
W1: Load value output from the first load detection means (3) W2: Load value output from the second load detection means (3) W3: Load value output from the third load detection means (3) W4: Load value output from the fourth load detection means (3) V1: Voltage output from the first load detection means (3) V2: Voltage output from the second load detection means (3) V3: Third load detection Voltage output from the means (3) V4: Voltage output from the fourth load detection means (3) WS: Total load value

  A1, a2, a3 and a4 are constants other than 0 set in advance. b1, b2, b3 and b4 are preset constants.

  W1 corresponds to the load after the taring process applied to the right side on the head side of the bed bed (21). W2 corresponds to the load after the taring process applied to the left side on the head side of the bed bed (21). W3 corresponds to the load after the taring process applied to the right side of the foot side of the bed bed (21). W4 corresponds to the load after the taring process applied to the left side of the foot side of the bed bed (21).

  In the present embodiment, the total load value determination means (9) determines whether or not the total load value WS is, for example, 20 kgf (196N) or more as the first threshold value T1. The first threshold value T1 is preset and stored in the storage means.

  However, in the present invention, the first threshold value T1 is not limited to 20 kgf (196 N), and can be changed in various ways according to the physical condition, weight, etc. of the person (H), for example, 10 to 50 kgf It is desirable to set in the range of (98 to 490N).

  Moreover, in this invention, as a load value output from the 1st-4th load detection means (3) (3) (3) (3), 1st-4th detection means (3) (3) (3) ( You may use the voltage (namely, V1, V2, V3, and V4) after the taring process output from 3).

  Further, in the present invention, the tare subtraction processing unit does not necessarily need to be attached to the total load value determination means (9), and is provided separately from the total load value determination means (9), for example. Also good.

  The fluctuation amount determination means (10) determines whether or not the fluctuation amount ΔW per predetermined time of each load value output from each load detection means (3) is equal to or less than a predetermined second threshold value T2. is there. More specifically, when the total load value WS is determined to be greater than or equal to the first threshold value T1 by the total load value determination unit (9), the fluctuation amount determination unit (10) varies the load value per predetermined time. It is determined whether or not the amount ΔW is less than or equal to a predetermined second threshold T2.

  In the present embodiment, whether or not the variation amount ΔW per second of each load value is 200 gf (1.96 N) or less as the second threshold value T2 is determined by the variation amount determination means (10). The second threshold value T2 is set and stored in advance in the storage means.

  However, in the present invention, the second threshold value T2 is not limited to 200 gf (1.96 N), and can be variously changed according to the physical state, weight, etc. of the person (H). It is desirable to set in the range of ˜2000 gf (0.98 to 19.6 N). Further, in the present invention, the fluctuation amount ΔW is not limited to the fluctuation amount per second of the load value, and can be variously changed according to the physical state, weight, etc. of the person (H). It is desirable that the fluctuation amount per hour is in the range of ˜300 s.

  The center-of-gravity position determination means (11) is a person on the bed bed (21) based on the four load values output from the first to fourth load detection means (3) (3) (3) (3) ( H) is calculated, and it is determined whether or not the center of gravity position G is in a predetermined sleeping area (21a) on the bed bed (21). More specifically, the center-of-gravity position determination means (11) has four loads when the fluctuation amount determination means (10) determines that the fluctuation amount ΔW per predetermined time of each load value is equal to or less than the second threshold value T2. Based on the value, the center-of-gravity position G of the person (H) on the bed-bed part (21) is calculated, and it is determined whether the center-of-gravity position G is in the predetermined sleeping area (21a) of the bed-bed part (21). To do.

  In the center-of-gravity position determination means (11), when the coordinates of the center-of-gravity position G of the person (H) on the bed bed (21) are (GX, GY), the coordinates (GX, GY) are expressed by, for example, the following formula (f ) And (g).

GX = (W1 + W2-W3-W4) × (1 / WS) × (BX / 2) Formula (f)
GX = (W1 + W3-W2-W4) × (1 / WS) × (BY / 2) Expression (g)

However,
BX: Leg spacing in the length direction of the bed (20) BY: Leg spacing in the width direction (that is, left-right direction) of the bed (20)

  In addition, the sleeping area (21a) of the bed bed (21) is the central part of the bed bed (21). Specifically, when the length of the bed bed portion (21) is 1900 mm and the width of the bed bed portion (21) is 830 mm, the sleeping area (21a) of the bed bed portion (21) is, for example, a bed bed It is set in a region that is 300 mm or more away from each edge in the length direction of the portion (21) to the center side and 100 mm or more away from each edge in the width direction of the bed bed portion (21) to the center portion side. Note that programs, numerical values (BX, BY), a sleeping area (21a), and the like necessary for calculating the center-of-gravity position G are preset and stored in the storage means.

  However, in the present invention, the sleeping area (21a) of the bed sleeping section (21) is not limited to the above-described area, but the size of the bed sleeping section (21) and the physical state of the person (H). Various changes are made according to height, etc.

  The duration determination unit (12) functions as a first duration determination unit, a second duration determination unit, and a third duration determination unit described below.

  When the total load value WS is determined to be greater than or equal to the first threshold value T1 by the total load value determination unit (9), the first duration determination unit determines that the total load value WS is equal to or greater than the first threshold value T1. It is determined whether it has continued for more than an hour.

  The second duration determination means, when the fluctuation amount determination means (10) determines that the fluctuation amount ΔW per predetermined time of each load value is equal to or less than the second threshold T2, the fluctuation of each load value per predetermined time. It is determined whether or not the state where the amount ΔW is equal to or less than the second threshold value T2 continues for a predetermined time or more.

  The third continuation time determining means determines that the gravity center position G is in the sleeping area (21a) of the bed sleeping portion (21) when the gravity center position determining means (11) determines that the gravity center position G is in the sleeping area (21a). It is determined whether or not the state in the sleeping area (21a) continues for a predetermined time or more.

  The duration determination means (12) functions as the above three duration determination means.

  The configuration of the duration determination means (12) in the present embodiment will be described in detail as follows.

  That is, the duration determination means (12) has a duration measurement unit (not shown) that measures the time during which the predetermined state continues. The duration determination means (12) determines that the total load value WS is greater than or equal to the first threshold T1 by the total load value determination means (9), and each load value by the variation amount determination means (10). Is determined to be less than or equal to the second threshold value T2, and the center-of-gravity position determination means (11) determines that the center-of-gravity position G is in the sleeping region (21a) of the bed bed (21). In the case of being performed, as a predetermined state, while the state where the center of gravity position G is in the sleeping region (21a) of the bed bed portion (21) continues, the duration measuring unit measures the time and the duration measuring unit It is determined whether or not the measured measurement time continues for a predetermined time or more.

  In this embodiment, it is determined by the continuation time determination means (12) whether or not the state where the center of gravity position G is in the sleeping region (21a) of the bed bed (21) continues for 30 seconds or more.

  However, in the present invention, the predetermined time applied at the time of determination by the continuation time determination means (12) is not limited to 30 s, but can be variously changed according to the body condition, weight, etc. of the person (H). For example, it is desirable that the time be in the range of 5 to 300 s.

  The breath determination means (13) is configured to breathe a person (H) based on at least one of the load values output from the first to fourth load detection means (3), (3), (3), and (3). Whether or not can be detected is determined.

  More specifically, the breath determination means (13) is after the total load value WS is determined to be greater than or equal to the first threshold T1 by the total load value determination means (9), and the fluctuation amount determination means (10 ) To determine that the variation amount ΔW per predetermined time of each load value is equal to or less than the second threshold value T2, and the gravity center position determination means (11) sets the gravity center position G to the bed bed portion (21). After it is determined that the person is in the sleeping area (21a), it is determined whether or not the respiration of the person (H) can be detected.

  The configuration of the breath determination means (13) in the present embodiment will be described in detail as follows.

  That is, the breath determination means (13) is a temporal variation of at least one of the four load values output from the first to fourth load detection means (3) (3) (3) (3). Depending on whether the pattern matches the temporal variation pattern of the load value that varies according to the breathing of the person (H) (hereinafter referred to as “breathing pattern”), the person (H) It is determined whether or not respiration can be detected. That is, when the fluctuation pattern matches the breathing pattern, it is determined that the breathing of the person (H) can be detected. On the other hand, when the fluctuation pattern does not match the breathing pattern (for example, temporal variation of the load value) In the case where there is not, the person (H) is determined not to be able to detect respiration. The breathing pattern is preset and stored in the storage means.

  In the present embodiment, whether or not the breath determination means (13) can detect the breath of the person (H) depending on whether or not the temporal variation patterns of all four load values match the breath pattern. It is supposed to judge.

  The presence determination means (14) determines that a person (H) is present on the bed sleeping portion (21).

  More specifically, the presence determination means (14) is determined by the total load value determination means (9) that the total load value WS is greater than or equal to the first threshold value T1, and the variation amount determination means (10) It is determined that the fluctuation amount ΔW per predetermined time of the load value is equal to or less than the second threshold value T2, and the center of gravity position G is in the sleeping region (21a) of the bed bed portion (21) by the center of gravity position determining means (11). It is determined by the duration determination means (12) that the predetermined state has continued for a predetermined time or more, and it is determined by the breath determination means (13) that the respiration of the person (H) can be detected. In this case, it is determined that the person (H) is present in the bed sleeping portion (21).

  When the second communication means (15) determines that the person (H) is present on the bed bed (21) by the bed determination means (14), that fact (that is, the bed bed ( 21) Information on the fact that a person (H) is on the floor) is transmitted to a remote location etc. via a predetermined wired communication network such as a telephone line network, the Internet, a wired LAN, a wireless LAN, or a wireless communication network. The information is transmitted to a predetermined place or transmitted to a notification means (16) disposed at a remote place or the like. The second communication means (15) is constituted by a modem or the like.

  The notifying means (16) determines that the person (H) is present on the bed sleeping part (21) by the presence determination means (14), and the second communication means (15) provides information to that effect. Is transmitted to a notification target person such as a nurse, a caregiver, or a monitor.

  This notification means (16) has a notification speaker, a notification lamp, a display means, and the like. The notification speaker notifies the notification target person of predetermined information with sounds such as voice and buzzer sound. The notification lamp notifies the notification target person of predetermined information by lighting or blinking the lamp. The display means notifies predetermined information to the notification target person by displaying characters, figures, and the like, and is configured by a liquid crystal display, a CRT, or the like.

  This notification means (16) is, for example, installed in a place where a person to be notified is present (for example, a monitoring room, a nurse station, a place where caregivers are packed) or mounted on a mobile phone.

  Next, a bed occupancy detection method using the bed occupancy detection device (1) of the present embodiment will be described below based on the flowchart shown in FIG.

  As shown in FIG. 4, in step S <b> 1, first to fourth load detections are performed on loads applied to the head side right part, the head side left part, the foot side right part, and the foot side left part of the bed bed part (21), respectively. Means (3), (3), (3), and (3) are continuously detected every predetermined time. This process is referred to as “load detection process (S1)”.

  This step S1 will be described in detail as follows. As described above, from each load detection means (3), a voltage corresponding to the magnitude of the load applied to each part of the bed bed (21) is continuously output as a load value every predetermined time. These voltages are transmitted to the control device (4) at once. Each transmitted voltage is amplified by the amplifying means (5), then converted from an analog signal to a digital signal by the analog-digital converting means (6), and then a predetermined wireless communication network by the first communication means (7). Or it transmits continuously to the total load value determination means (9) of a determination apparatus (8) for every predetermined time via a wired communication network.

  In step S2, the total load value WS obtained by adding the four load values W1, W2, W3, and W4 output from the first to fourth load detection means (3) (3) (3) (3) is the first threshold value. It is determined by total load value determination means (9) whether T1 is 20 kgf (196 N) or more. This process is referred to as “total load value determination process (S2)”. If it is determined that the total load value WS is equal to or greater than 20 kgf (196N) (that is, when WS ≧ 20 kgf), the process proceeds to step S4 as “YES”. On the other hand, if it is determined that the total load value WS is not equal to or greater than 20 kgf (196 N) (that is, if WS <20 kgf), the process proceeds to step S3 as “NO”.

  In this step S2, the four load values used for the determination by the total load value determination means (9) are all values that have been previously tared by the tare processing section of the total load value determination means (9). It is. Therefore, in this step S2, if no person (H) or an object is present on the bed bed (21), the load values W1, W2, W3 output from the load detecting means (3) and W4 is set to 0 kgf (0N) in all cases, that is, the total load value WS is set to 0 kgf (0N).

  In step S3, the measurement of the duration performed by the duration measurement unit of the duration determination means (12) is reset. Next, the process returns to step S2. In step S3, if the measurement time measurement unit does not measure the duration time, this step S3 is ignored (that is, this step S3 is not performed), and the process returns to step S2.

  In step S4, the fluctuation amount determination means (10) determines whether or not the fluctuation amount ΔW per second of each load value is 200 gf (1.96 N) or less as the second threshold value T2. This step is referred to as “variation amount determination step (S4)”. If it is determined that the fluctuation amount ΔW is equal to or less than 200 gf (1.96 N) (ie, ΔW ≦ 200 gf), the process proceeds to step S5 as “YES”. On the other hand, if it is determined that the fluctuation amount ΔW is not 200 gf (1.96 N) or less (that is, ΔW> 200 gf), the process returns to step S3.

  In step S5, the gravity center position G of the person (H) on the bed bed portion (21) is calculated according to the above formulas (f) and (g) based on the four load values, and the gravity center position G is calculated from the bed bed portion ( It is determined by the center-of-gravity position determination means (11) whether or not it is in the sleeping region (21a) of 21). This process is referred to as a “centroid position determination process (S5)”. And when it determines with the gravity center position G being in the sleeping area | region (21a) of a bed bed part (21), it progresses to step S6 as "YES". On the other hand, if it is determined that the center-of-gravity position G is not in the sleeping region (21a) of the bed sleeping portion (21), “NO” is returned to step S3.

  In step S6, it is determined by the continuation time determination means (12) whether or not the time during which the center of gravity position G is in the sleeping region (21a) of the bed bed (21) continues is zero. If the time is 0, "YES" is determined and the process proceeds to step S7. On the other hand, if the time is not 0, “NO” and the process proceeds to step S8.

  In step S7, the measurement by the duration measurement unit of the duration determination means (12) is started for the time during which the center of gravity position G is in the sleeping region (21a) of the bed bed (21). Next, the process proceeds to step S8.

  In step S8, whether or not the state where the center of gravity position G is in the sleeping region (21a) of the bed bed portion (21) continues for 30 seconds or longer, that is, the measurement by the duration measurement unit of the duration determination means (12). Whether or not 30 seconds or more have elapsed since the start is determined by the duration determination means (12). This process is referred to as “continuation time determination process (S8)”. If it is determined that the state where the center of gravity G is in the sleeping region (21a) of the bed bed (21) continues for 30 seconds or longer, that is, the measurement by the duration measurement unit of the duration determination means (12). If it is determined that 30 s or more have elapsed since the start of “NO”, the process proceeds to step S9 as “YES”. On the other hand, if not, the process returns to step S2 as “NO”, and steps S2 to S8 are performed for 30 seconds after the measurement by the duration measuring unit of the duration judging means (12) is started in the duration judging step (S8). It repeats until it determines with having passed above.

  In step S9, the time measurement by the duration measurement unit of the duration determination means (12) is reset. Next, the process proceeds to step S10.

  In step S10, the respiration determining means (13) uses the breath determination means (13) based on at least one of the four load values output from the first to fourth load detection means (3) (3) (3) (3). Detecting (H) respiration. Next, the process proceeds to step S11.

  In step S11, the temporal variation pattern of at least one of the four load values output from the first to fourth load detection means (3), (3), (3), and (3) is the same as the respiratory pattern. Whether or not the breathing of the person (H) can be detected is determined by the respiration determining means (13) according to whether or not he / she is doing. This process is referred to as “respiration determination process (S11)”. Then, if it is determined that the fluctuation pattern matches the breathing pattern and the breathing of the person (H) can be detected, the process proceeds to step S12 as “YES”. On the other hand, if it is determined that the fluctuation pattern does not match the breathing pattern and the breathing of the person (H) cannot be detected, the process proceeds to step S13 as “NO”.

  In step S12, the presence determination means (14) determines that a person (H) is present on the bed sleeping portion (21). This process is referred to as “bed presence determination process (S12)”. Next, the process proceeds to step S14.

  In step S13, the presence determination means (14) determines that an object (eg, a heavy object) is present on the bed bed (21) instead of a person (H).

  In step S14, information indicating that the person (H) is present on the bed bed (21) is notified by the second communication means (15) via the predetermined wireless communication network or wired communication network (16). ). This step S14 is referred to as “second communication step (S14)”. Next, the process proceeds to step S15.

  In step S15, information indicating that the person (H) is present on the bed sleeping portion (21) is notified to the notification subject by the notification means (16). This step S15 is referred to as “notification process (S15)”. Thereby, the notification subject can know that the person (H) is present on the bed sleeping portion (21).

  In the present embodiment, the steps from the load detection step (S1) to the notification step (S15) are referred to as “bed presence detection steps (S1 to S15)” in the bed bed detection method of the present embodiment.

  Further, in the present embodiment, the presence detection process (S1 to S15) is repeated a plurality of times every predetermined time, so that a person (H) is present on the bed sleeping portion (21) every predetermined time. Detect whether or not. In this case, the predetermined time is desirably set in a range of 1 to 60 minutes, for example. However, in the present invention, the predetermined time is not limited to the above range, and can be variously changed.

  Further, when the occupancy detection step (S1 to S15) is repeated a plurality of times as described above, the load value output from the first to fourth load detection means (3) (3) (3) (3) is tared. When the pulling process has already been performed once, the tare pulling process does not necessarily have to be performed every time the occupancy detection process (S1 to S15) is repeated.

  Thus, the bed presence detection method of the present embodiment has the following advantages.

  In the total load value determination step (S2), the total load value WS obtained by adding the four load values output from the four load detection means (3) (3) (3) (3) is 20 kgf ( 196N) or not, in this total load determination step (S2), whether the person (H) is present on the bed bed (21) or not the person (H). It is possible to determine whether there is a relatively light object (eg, luggage) or a small animal (eg, cat, dog) or the like that is less than one threshold T1.

  In the breath determination step (S11), the person (H) breaths based on at least one of the four load values output from the four load detection means (3) (3) (3) (3). It is determined whether it can be detected.

  The occupancy determination step (S12) is relatively light when the total load value WS is determined to be greater than or equal to the first threshold T1 in the total load value determination step (S2), that is, on the bed bed portion (21). When it is determined that there is no object or small animal, and when it is determined that the respiration of the person (H) can be detected in the respiration determination step (S11), the bed on the bed (21) Therefore, according to the present invention, it can be reliably detected that the person (21) is present on the bed sleeping portion (21).

  The breath determination step (S11) is relatively light after the total load value WS is determined to be equal to or greater than the first threshold T1 in the total load value determination step (S2), that is, on the bed bed (21). Since it is performed after it is determined that there is no object or small animal, according to the present embodiment, it is more reliably detected that a person (H) is present on the bed sleeping portion (21). can do.

  Further, the fluctuation amount determination step (S4) determines whether or not the fluctuation amount ΔW per second of each load value is equal to or less than 200 gf (1.96N) as the second threshold value T2. In (S4), it is possible to determine whether the body movement per second of the person (1) on the bed bed (21) is small or large. Thereby, for example, it is determined whether the person (H) is moving on the bed bed (21) from its end to the center sleeping area (21a) or has already reached the sleeping area (21a). can do. That is, when a person (H) is present on the bed sleeping part (21) for the purpose of sleeping or the like, the person (H) sleeps on the bed sleeping part (21) from the end to the central part. When trying to move to the region (21a), when the person (H) is moving, the body movement of the person (H) per second is large, so the amount of change per second of each load value. ΔW exceeds the second threshold T2. Then, when the person (H) reaches the sleeping area (21a) of the bed bed (21), the body movement of the person (H) per second becomes small, and thus the amount of variation ΔW per second of each load value. Is less than or equal to the second threshold T2. In other words, when it is determined that the amount of variation ΔW per second of each load value is equal to or less than the second threshold T2, the person (H) goes to bed of the bed bed (21) for the purpose of going to bed or the like. It can be estimated that the region (21a) has been reached.

  In the presence determination step (S12), when it is determined in the variation determination step (S4) that the variation ΔW per second of each load value is equal to or less than the second threshold T2, that is, the person (H ), When it is determined that the body movement per second is small, since it is determined that the person (H) is present on the bed bed portion (21), according to the present embodiment, the bed bed portion ( 21) It is possible to more reliably detect that the person (H) is on the floor for the purpose of sleeping or the like.

  The breath determination step (S11) is performed after it is determined in the variation amount determination step (S4) that the variation amount ΔW per second of each load value is equal to or less than the second threshold value T2, that is, the person (H). Since it is performed after it is determined that the body movement per second is small, in this breath determination step (S11), it is determined whether or not the breath of the person (H) can be detected when the body movement of the person (H) is large. Compared to the case of determination, the determination can be performed accurately. Therefore, according to the present embodiment, it is possible to more reliably detect that a person (H) is present on the bed sleeping portion (21).

  The center-of-gravity position determination step (S5) calculates the center-of-gravity position G of the person (H) on the bed bed portion (21) based on the four load values, and the calculation position G is the bed bed portion (21). It is determined whether it is in the sleeping area (21a).

  Then, in the bed determination step (S12), if it is determined in the barycentric position determination step (S5) that the barycentric position G is in the sleeping area (21a) of the bed sleeping part (21), the bed sleeping part (21 ) Since it is determined that the person (H) is present on the floor, according to the present embodiment, it is more reliably detected that the person (H) is present on the bed sleeping portion (21). be able to.

  In addition, the breath determination step (S11) is performed after it is determined in the gravity center position determination step (S5) that the gravity center position G is in the sleeping region (21a) of the bed bed portion (21). ) It is possible to more reliably detect that the person (H) is on the floor.

  In the duration determination step (S8), it is determined in the total load value determination step (S2) that the total load value WS is greater than or equal to the first threshold value T1, and each load value is determined in the variation amount determination step (S4). It is determined that the fluctuation amount ΔW per second is equal to or less than the second threshold value T2, and it is determined in the gravity center position determination step (S5) that the gravity center position G is in the sleeping area (21a) of the bed bed portion (21). In this case, it is determined whether or not the time during which the center of gravity position G is in the sleeping region (21a) of the bed sleeping portion (21) continues for 30 seconds or longer.

  In the presence determination step (S12), it is further determined in the duration determination step (S8) that the state where the center of gravity position G is in the sleeping region (21a) of the bed bed (21) continues for 30 seconds or more. In this case, since it is determined that the person (H) is present on the bed sleeping portion (21), according to the present embodiment, the person (H) is present on the bed sleeping portion (21). It can be detected more reliably.

  In the second communication step (S14), information indicating that the person (H) is present on the bed sleeping portion (21) is transmitted to the notification means (16). (16) can be reliably transmitted.

  Moreover, since the notification step (S15) notifies information indicating that the person (H) is present on the bed / bed portion (21), such information is provided to nurses, caregivers, monitors, and the like. It is possible to notify the notification target person.

  Moreover, in this embodiment, since a bed detection process (S1-S15) is repeated for every predetermined time, it detects whether the person (H) is on the bed bed part (21) for every predetermined time. can do.

  Thus, in the present embodiment, as shown by the dotted line in the flowchart of FIG. 4, in the bed presence detection method (S12), a person (H) is present on the bed bed portion (21). When it is determined that the person is on the floor, information on the person (H) leaving the bed (21) (for example, information indicating that the person (H) has left the bed (21)) is detected. The bed leaving information detecting step may be started. That is, when it is determined in the presence determination step (S12) that the person (H) is present on the bed bed portion (21), this determination result is used as a trigger for starting the bed leaving information detection step. May be transmitted to the bed leaving information detecting apparatus. In this case, the bed leaving information detection step can be started based on the determination result that the person (H) is definitely present on the bed sleeping portion (21).

  In the present embodiment, the bed presence detection device (1) determines that the person (H) is present on the bed sleeping portion (21) by the bed determination means (14). You may be made to start the process by the bed leaving information detection apparatus which detects the information regarding the bed leaving of the person (H) on the bed part (21). That is, when it is determined by the presence determination means (14) that the person (H) is present on the bed sleeping portion (21), this determination result is used as a trigger for starting the processing by the bed leaving information detection device. This may be transmitted to the bed information detecting device.

  In these cases, a known detection process and a detection device can be employed as the bed information detection process and the bed information detection apparatus used therefor, respectively.

  Moreover, the bed presence detection apparatus (1) of this embodiment has the same advantages as the above detection method.

  The bed occupancy monitoring system (30) according to one embodiment of the present invention includes the bed occupancy detection device (1) of the present embodiment. Therefore, according to this monitoring system (30), it is possible to monitor at a remote place or the like that a person (H) is present on the bed sleeping portion (21).

  Although one embodiment of the present invention has been described above, the present invention is not limited to that shown in the above embodiment, and various modifications can be made.

  For example, in the above-described embodiment, the total load value determination step (S2), the variation amount determination step (S4), and the gravity center position determination step (S5) are performed in this order. In the present invention, these three steps are performed. The execution order is not limited to the order of the total load value determination step (S2), the variation amount determination step (S4), and the gravity center position determination step (S5), and can be variously changed. The order of the total load value determining step (S2), the center-of-gravity position determining step (S5), and the variation amount determining means (S4) may be used, the variation amount determining step (S4), the total load value determining step (S2), and The order of the center-of-gravity position determination step (S5) may be used, or any other order may be used. In this case, the taring process is performed before the first of these three steps.

  Further, the bed occupancy detection device according to the present invention may be configured to be able to measure the biological information (eg, respiratory rate, heart rate) of the person (H) on the bed bed (21). It may be configured in combination with a device that measures the biological information of a person (H).

  In the above embodiment, the number of load detecting means (3) is four. However, in the present invention, for example, two or three may be used, or four or more.

  INDUSTRIAL APPLICABILITY The present invention can be used in a bed occupancy detection method, an occupancy detection device, and an occupancy monitoring system that detect that a person is present on the bed sleeping portion.

FIG. 1 is a schematic diagram of a bed occupancy detection apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of the bed portion of the bed. FIG. 3 is a block diagram showing the configuration of the detection apparatus. FIG. 4 is a flowchart of a bed detection method using the detection device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bed presence detection apparatus 2 ... Floor detection means 3 ... Load detection means 4 ... Control apparatus 8 ... Determination apparatus 9 ... Total load value determination means 10 ... Variation amount determination means 11 ... Gravity center position determination means 12 ... Duration time Determination means (first to third duration determination means)
13 ... Respiration determination means 14 ... In-bed determination means 15 ... Second communication means 16 ... Informing means 20 ... Bed 21 ... Bed sleeping portion 21a ... Sleeping area 30 ... Bed in-bed monitoring system H ... Human

Claims (27)

A load detection step of detecting a load applied to each of a plurality of spaced apart portions of the bed bed portion by a plurality of load detecting means corresponding to each portion;
A total load value determination step of determining whether a total load value obtained by summing a plurality of load values output from the plurality of load detection means is equal to or greater than a predetermined first threshold;
A breath determination step of determining whether or not human breathing can be detected based on at least one of the plurality of load values output from the plurality of load detection means;
When it is determined in the total load value determination step that the total load value is greater than or equal to the first threshold value and it is determined in the respiration determination step that human respiration can be detected, a person is present on the bed bed. A presence determination step for determining that the
A bed presence detection method comprising a bed detection step including:   The bed occupancy detection method according to claim 1, wherein the respiration determination step is performed after it is determined in the total load value determination step that the total load value is equal to or greater than a first threshold value. The presence detection step includes
When it is determined in the total load value determination step that the total load value is equal to or greater than the first threshold, the first continuation is performed to determine whether or not the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. Including a time determination process,
In the presence determination step, when it is determined in the first duration determination step that the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more, there is a person on the bed sleeping portion. The bed presence detection method according to claim 1, wherein the bed is determined to be floored. The presence detection step includes
A variation amount determination step of determining whether or not the variation amount per predetermined time of each load value is equal to or less than a predetermined second threshold value;
In the presence determination step, when it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or less than a second threshold value, a person is present on the bed sleeping portion. The bed presence detection method according to any one of claims 1 to 3.   The bed occupancy detection method according to claim 4, wherein the respiration determination step is performed after it is determined in the variation amount determination step that a variation amount per predetermined time of each load value is equal to or less than a second threshold value. The presence detection step includes
When it is determined in the variation amount determination step that the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value, the state where the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value is a predetermined time. Including a second duration determination step for determining whether or not it is continuing,
When the presence determination step further determines that the state in which the variation amount per predetermined time of each load value is equal to or less than the second threshold is continued for a predetermined time or more in the second duration determination step, The bed presence detection method according to claim 4 or 5, wherein it is determined that a person is present on the bed portion. The presence detection step includes
Calculating a center of gravity position of a person on the bed bed based on the plurality of load values, and including a center-of-gravity position determination step for determining whether the center of gravity position is in a predetermined sleeping area of the bed bed;
The said bed determining step further determines that a person is present on the bed sleeping portion when it is determined in the barycentric position determining step that the center of gravity position is in the sleeping area of the bed sleeping portion. The bed presence detection method in any one of -6.   The bed occupancy detection method according to claim 7, wherein the respiration determination step is performed after it is determined in the gravity center position determination step that the gravity center position is in the sleeping region of the bed sleeping portion. The presence detection step includes
When it is determined in the center of gravity position determination step that the center of gravity position is in the sleeping area of the bed bed portion, it is determined whether or not the state where the center of gravity position is in the sleeping area of the bed bed portion has continued for a predetermined time or longer. Including a duration determination step,
In the presence determination step, when it is determined in the third duration determination step that the center of gravity is in the sleeping region of the bed bed portion for a predetermined time or longer, a person is placed on the bed bed portion. The bed occupancy detection method according to claim 7 or 8, wherein it is determined that the person is occupying the bed. The presence detection step includes
The bed according to any one of claims 1 to 9, further comprising a notifying step of notifying information to that effect when it is determined that a person is present on the bed sleeping portion in the bed presence determining step. How to detect bed presence. The presence detection step includes
The bed according to any one of claims 1 to 10, further comprising a communication step of transmitting information to that effect when it is determined that a person is present on the bed in the bed determination step. How to detect bed presence.   The bed leaving information detection step of detecting information related to the bed leaving of the person on the bed sleeping portion is started when it is determined that the person is present on the bed sleeping portion in the bed lying determination step. The bed presence detection method according to any one of the above.   The bed presence detection method according to any one of claims 1 to 12, wherein the bed detection step is repeated every predetermined time. A plurality of load detecting means for detecting a load applied to each of a plurality of spaced apart portions of the bed bed portion;
Total load value determining means for determining whether or not a total load value obtained by summing a plurality of load values output from the plurality of load detecting means is equal to or greater than a predetermined first threshold;
Respiration determination means for determining whether or not human respiration can be detected based on at least one load value among the plurality of load values output from the plurality of load detection means;
When it is determined by the total load value determining means that the total load value is greater than or equal to the first threshold value and it is determined by the respiration determining means that a person's breathing can be detected, a person is present on the bed sleeping portion. Occupancy determination means for determining that
An in-bed detection device comprising: an in-bed detection means including:   The respiration determination means determines whether or not human respiration can be detected after the total load value determination means determines that the total load value is greater than or equal to a first threshold value. Bed bed detection device. The presence detection means includes
When the total load value is determined to be greater than or equal to the first threshold by the total load value determination means, the first continuation is performed to determine whether or not the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. Including time determination means,
The occupancy determining means further determines that there is a person on the bed sleeping portion when the first duration determining means determines that the state where the total load value is equal to or greater than the first threshold continues for a predetermined time or more. The bed presence detection apparatus according to claim 14 or 15, wherein it is determined that the person is flooring. The presence detection means includes
A variation amount determining means for determining whether or not the variation amount per predetermined time of each load value is equal to or less than a predetermined second threshold;
The occupancy determination means further has a person lying on the bed sleeping portion when the fluctuation amount determination means determines that the fluctuation amount of each load value per predetermined time is equal to or less than a second threshold value. The bed presence detection device according to any one of claims 14 to 16, wherein the bed presence detection device is determined.   The respiration determining means determines whether or not a person's respiration can be detected after the fluctuation amount determining means determines that the fluctuation amount per predetermined time of each load value is equal to or less than a second threshold value. The bed presence detection apparatus according to claim 17. The presence detection means includes
When the variation amount determining means determines that the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value, the state where the variation amount per predetermined time of each load value is equal to or smaller than the second threshold value is a predetermined time. Including a second duration determination means for determining whether or not it is continuing,
When the presence determination means further determines that the state in which the variation amount per predetermined time of each load value is less than or equal to the second threshold value continues for a predetermined time or longer by the second duration determination means, The bed presence detection apparatus according to claim 17 or 18, wherein it is determined that a person is present on the bed portion. The presence detection means includes
Calculating a center of gravity position of a person on the bed bed based on the plurality of load values, and including a center-of-gravity position determination means for determining whether the center of gravity position is in a predetermined sleeping area of the bed bed section;
The occupancy determining means further determines that a person is present on the bed sleeping portion when the centroid position determining means determines that the centroid position is in the sleeping area of the bed sleeping portion. The bed presence detection apparatus in any one of Claims 14-19.   21. The breath determining unit is configured to determine whether or not a person's breath can be detected after the barycentric position determining unit determines that the barycentric position is in the sleeping region of the bed. Bed bed detection device. The presence detection means includes
When the center-of-gravity position determination means determines that the center-of-gravity position is in the sleeping area of the bed sleeping portion, it is determined whether or not the state where the gravity center position is in the sleeping area of the bed sleeping portion continues for a predetermined time or more. Including duration determination means,
In the case where the third continuation time determination unit determines that the state where the center of gravity is in the sleeping region of the bed bed portion continues for a predetermined time or longer, the presence determination unit determines whether the person is on the bed bed portion. The bed presence detection device according to claim 20 or 21, wherein the bed presence detection device is determined to be present. The presence detection means includes
The bed according to any one of claims 14 to 22, further comprising notification means for notifying the information when the presence determination means determines that a person is present on the bed sleeping portion. Bed detection device. The presence detection means includes
The bed according to any one of claims 14 to 23, further comprising communication means for transmitting information to that effect when it is determined by the presence determination means that a person is present on the bed sleeping portion. Bed detection device.   When it is determined that the person is present on the bed sleeping portion by the bed determining means, the processing by the bed leaving information detecting device that detects information related to the bed leaving of the person on the bed sleeping portion is started. The bed presence detection apparatus according to any one of claims 14 to 24.   The bed presence detection apparatus according to any one of claims 14 to 25, wherein the processing by the presence detection means is repeated every predetermined time. A plurality of load detecting means for detecting a load applied to each of a plurality of spaced apart portions of the bed bed portion;
Total load value determining means for determining whether or not a total load value obtained by summing a plurality of load values output from the plurality of load detecting means is equal to or greater than a predetermined first threshold;
Respiration determination means for determining whether or not human respiration can be detected based on at least one load value among the plurality of load values output from the plurality of load detection means;
When it is determined by the total load value determining means that the total load value is greater than or equal to the first threshold value and it is determined by the respiration determining means that a person's breathing can be detected, a person is present on the bed sleeping portion. Occupancy determination means for determining that
When it is determined by the presence determination means that a person is present on the bed sleeping portion, notification means for notifying information to that effect;
A bed occupancy monitoring system comprising occupancy detection means including a bed.

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