JP5474471B2 - How to detect bed condition - Google Patents

Description

  The present invention relates to a bed occupancy status detection method and a bed occupancy status detection apparatus for detecting a subject's occupancy status (e.g., back-up operation) on a couch (e.g., a bed couch).

  The following method is known as a method for detecting the bed situation of a subject (e.g., sick, elderly, cared person, infant) who is on the bed (bed bed) of the bed.

  Loads applied to the head-side left leg, the head-side right leg, the foot-side left leg, and the foot-side right leg that support the bed portion of the bed are respectively detected by load detection sensors. Based on the load value detected by these load detection sensors, the center of gravity of the subject on the bed is calculated. And it is the method of detecting the subject's bed situation on a bed part based on this gravity center position (for example, refer patent documents 1 and 2).

  Further, in Patent Documents 3 and 4, when the center of gravity of the subject on the bed portion of the bed is located within a predetermined end region of the bed portion, the subject gets up on the bed portion and the like. Discloses an apparatus configured to notify an alarm.

  Moreover, several apparatuses are known as an apparatus which detects the test subject's getting off from the bed bed part, and the back raising operation | movement as a raising operation | movement (for example, refer patent documents 5-10).

  A caregiver (eg, nurse, subject's family, relatives) who knows that the subject is getting out of bed or raising his back using such devices or methods goes to the place where the bed is installed and Predetermined assistance and processing are performed.

Japanese Patent No. 3098997 Japanese Patent No. 3529332 Japanese Patent No. 3093745 Japanese Patent No. 3322632 JP 2005-152616 A JP 2006-305343 A JP 2007-175208 A JP 2007-330658 A JP 2007-330659 A JP 2008-264338 A

  Thus, in this type of apparatus and method, in order to prevent a problem in which an alarm is issued although the subject on the bed is not raising the back, that is, the alarm is falsely reported, and / or In order to prevent a problem that an alarm is not notified even though the subject is raising his back, it is desirable that the detection performance of the subject's back raising operation is as good as possible.

  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 stagnation state that can improve the detection performance of the subject's bed stagnation operation, particularly for a back raising operation, and the detection. An object of the present invention is to provide an apparatus for detecting the presence of a bed used in the method.

  The present invention provides the following means.

[1] A load detection step of detecting loads applied to the left and right temporal sides of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first and second preset values set in advance are N1 and N2, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
A second determination step for determining whether or not both are satisfied,
When the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied, a notification step of notifying an alarm;
A method for detecting the presence of a bed, comprising:

[2] A load detection step of detecting loads applied to the left and right temporal sides of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. _0, RH _- and then,
When the preset positive first and third to fifth set values are N1 and N3 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
A third determination step for determining whether or not all of the above are satisfied;
Either the first judgment formula (1) is satisfied and the third A judgment formula (3A), the third B judgment formula (3B), and the third C judgment formula (3C) are all satisfied, or the first judgment formula (1 ) And when the 3D determination formula (3D), the 3E determination formula (3E), and the 3F determination formula (3F) are all satisfied, a notification step of notifying an alarm;
A method for detecting the presence of a bed, comprising:

[3] A load detection step of detecting the load applied to the left and right temporal portions of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first to fifth set values set in advance are N1 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
A second determination step for determining whether or not both are satisfied,
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
A third determination step for determining whether or not all of the above are satisfied;
A case where the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied;
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third A judgment formula (3A), the third B judgment formula ( 3B) and the case where all the third C determination formulas (3C) are satisfied,
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third D judgment formula (3D), the third E judgment formula ( 3E) and the case where all the third F determination formulas (3F) are satisfied,
When the first determination formula (1) is satisfied and all of the third A determination formula (3A), the third B determination formula (3B), and the third C determination formula (3C) are satisfied,
If either the first judgment formula (1) is satisfied and the third D judgment formula (3D), the third E judgment formula (3E), and the third F judgment formula (3F) are all satisfied, an alarm An informing process for informing;
A method for detecting the presence of a bed, comprising:

[4] The load detection step further detects the load applied to the left foot side portion and the right foot side portion of the bed as a left foot side load and a right foot side load at a predetermined detection cycle, respectively.
The method for detecting the presence of a bed is as follows:
The current left foot side load, the left foot side load before a predetermined time, the current right foot side load, and the right foot side load before the predetermined time detected in the load detection step are LF ₀ , LF ₋ , RF ₀ and RF ₋ , respectively. age,
When the preset positive sixth set value is N6,
Next fourth judgment formula (4)
(LH ₋ + RH ₋ + LF ₋ + R F ₋ ) − (LH ₀ + RH ₀ + LF ₀ + R F ₀ ) <N6 Equation (4)
Including a fourth determination step of determining whether or not
The method for detecting the presence of a bed according to any one of the preceding items 1 to 3, wherein the notification step further notifies an alarm when the fourth determination formula (4) is satisfied.

  [5] The bed presence state detection method according to any one of items 1 to 4, wherein each set value is set according to the weight of the subject.

[6] Load detecting means for detecting loads applied to the left and right temporal portions of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first and second preset values set in advance are N1 and N2, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
Second determination means for determining whether or not both are satisfied,
Informing means for notifying an alarm when the first judgment formula (1) is satisfied and the second A judgment formula (2A) and the second B judgment formula (2B) are both satisfied,
A bed presence detection device comprising:

[7] Load detection means for detecting loads applied to the left and right temporal sides of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. _0, RH _- and then,
When the preset positive first and third to fifth set values are N1 and N3 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
Third determination means for determining whether or not all of the above are satisfied;
Either the first judgment formula (1) is satisfied and the third A judgment formula (3A), the third B judgment formula (3B), and the third C judgment formula (3C) are all satisfied, or the first judgment formula (1 ) And the third D determination formula (3D), the third E determination formula (3E), and the third F determination formula (3F) are all satisfied, a notification means for reporting a warning,
A bed presence detection device comprising:

[8] Load detecting means for detecting loads applied to the left and right temporal sides of the bed where the subject is present as a left temporal load and a right temporal load, respectively, at a predetermined detection cycle;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first to fifth set values set in advance are N1 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
Second determination means for determining whether or not both are satisfied,
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
Third determination means for determining whether or not all of the above are satisfied;
A case where the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied;
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third A judgment formula (3A), the third B judgment formula ( 3B) and the case where all the third C determination formulas (3C) are satisfied,
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third D judgment formula (3D), the third E judgment formula ( 3E) and the case where all the third F determination formulas (3F) are satisfied,
When the first determination formula (1) is satisfied and all of the third A determination formula (3A), the third B determination formula (3B), and the third C determination formula (3C) are satisfied,
If either the first judgment formula (1) is satisfied and the third D judgment formula (3D), the third E judgment formula (3E), and the third F judgment formula (3F) are all satisfied, an alarm An informing means for informing
A bed presence detection device comprising:

[9] The load detecting means further detects a load applied to the left foot side portion and the right foot side portion of the bed as a left foot side load and a right foot side load at a predetermined detection cycle, respectively.
The bed presence detection device further comprises:
The current left foot side load, the left foot side load before a predetermined time, the current right foot side load before the predetermined time, and the right foot side load before the predetermined time detected by the load detecting means are LF ₀ , LF ₋ , RF ₀ and RF ₋ , respectively. age,
When the preset positive sixth set value is N6,
Next fourth judgment formula (4)
(LH ₋ + RH ₋ + LF ₋ + R F ₋ ) − (LH ₀ + RH ₀ + LF ₀ + R F ₀ ) <N6 Equation (4)
Including fourth determination means for determining whether or not
The bed presence detection device according to any one of the preceding items 6 to 8, wherein the notification means further notifies a warning when the fourth determination formula (4) is satisfied.

  [10] The bed presence detection apparatus according to any one of items 6 to 9, wherein each set value is set according to the weight of the subject.

  The invention [1] has the following effects.

There are various types of back-up motions of the subject, and the basic back-up motion is an operation of raising the back from a state where the subject lies on the bed in parallel with the length direction of the bed. In this operation, the current total head side load LH ₀ + RH _{0 obtained} by adding up the current left head side load LH ₀ and the current right head side load RH ₀ is obtained from the total head side load LH ₋ + RH ₋ before a predetermined time. Also decreases. Therefore, by determining that the first determination formula (1) is satisfied in the first determination step, it is estimated that the subject performed a back-up operation.

  However, even when the test subject performs, for example, an “oblique roll-over operation” as an operation that is not a back-up operation (see FIG. 4A), the first determination formula (1) may be satisfied. Therefore, if an alarm is notified only by the determination result that the first determination formula (1) is satisfied, the alarm is notified even though the subject is not performing a back-up operation, that is, the alarm may be erroneously reported. is there.

Therefore, in order to solve this problem, the detection method of the invention of [1] includes a second determination step in addition to the first determination step. Thereby, it is possible to prevent false alarms when the subject performs the “oblique turning operation”, that is, it is possible to improve the detection performance of the subject's back raising operation.

  The invention [2] has the following effects.

  By determining that the first determination formula (1) is satisfied in the first determination step, it is estimated that the subject performed a back-up operation.

  However, when the test subject performs, for example, “upper body twisting back movement” (see FIG. 5A), the first determination formula may not be satisfied. For this reason, only a determination that the first determination formula (1) is satisfied, there are few detectable back raising operations.

Therefore, in order to increase the detectable back raising operation, the detection method of the invention [2] includes a third determination step in addition to the first determination step. Thereby, when the subject performs “upper body raising operation”, an alarm can be notified, that is, the detection performance of the subject's raising operation can be improved.

  According to the invention [3], since the second determination step and the third determination step are included in addition to the first determination step, the detection performance of the subject's back raising operation can be further improved.

  According to the invention of [4], since the fourth determining step is further included, it is assumed that the back-up motion is detected when the placed object previously placed on the head side portion of the bed is removed from the bed. It is possible to prevent a problem that an alarm is notified. Thereby, the detection performance of a test subject's back raising operation | movement can further be improved.

  According to the invention of [5], the detection performance of the test subject's back raising operation can be further improved by setting each set value according to the weight of the test subject.

  According to the inventions [6] to [10], it is possible to provide a bed occupancy state detecting device suitably used for the inventions [1] to [5].

FIG. 1 is a schematic perspective view of a bed occupancy state detection apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing the overall configuration of the apparatus. FIG. 3A is a schematic plan view of a bed and bed portion showing a first operation example of a subject. FIG. 3B is a graph showing the relationship between the elapsed time and the load reduction amount in the case of the first operation example shown in FIG. 3A. FIG. 4A is a schematic plan view of a bed and bed portion showing a second operation example of a subject. FIG. 4B is a graph showing the relationship between the elapsed time and the load reduction amount in the case of the second operation example shown in FIG. 4A. FIG. 5A is a schematic plan view of a bed and bed portion showing a third operation example of a subject. FIG. 5B is a graph showing the relationship between the elapsed time and the load reduction amount in the case of the third operation example shown in FIG. 5A. FIG. 6A is a schematic plan view of a bed and bed portion showing a fourth operation example of a subject. FIG. 6B is a graph showing the relationship between the elapsed time and the load reduction amount in the case of the fourth operation example shown in FIG. 6A. FIG. 7 is a schematic plan view of the bed and bed portion showing the fifth operation example of the subject.

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

  As shown in FIG. 1, a bed occupancy status detection apparatus 10 according to an embodiment of the present invention detects the occupancy status (leaving, body movement, etc.) of a subject H on a bed couch 31 as a bed. More specifically, in particular, it detects the back-up action of the subject H as the bed situation. The apparatus 10 is used in medical facilities (eg, hospitals), nursing homes, elderly facilities, general households, and the like. In this embodiment, this device 10 is used in a medical facility, for example.

  The bed 30 is installed on a bed installation surface 37 composed of a floor surface. The bed portion 31 of the bed 30 has a rectangular shape in plan view that is long in the height direction of the subject H. The subject H usually lies down (bed) in a supine posture (ie, a supine posture) on the bed portion 31 for sleeping.

  In the present embodiment, in the bed portion 31, the head side and the foot side of the subject H in the supine posture are respectively the head side and the foot side of the bed portion 31, and the left side and the right side of the subject H are the left side and the right side of the bed portion 31, respectively. And

  The bed 30 has four legs that horizontally support the bed 31 at a predetermined height, that is, a head-side left leg 32, a head-side right leg 32, a foot-side left leg 32, and a leg-side right leg. A portion 32 is provided. The head side left leg part 32, the head side right leg part 32, the foot side left leg part 32 and the foot side right leg part 32 are respectively the left head side part, right head side part, left foot side part and right foot of the bed part 31. The side portion is supported from below the bed portion 31. A bed moving caster 32 a is attached to the lower end of each leg 32.

  On the bed portion 31 of the bed 30, as a subject H, a sick person, a patient with dementia, an elderly person, a healthy person, an infant, etc. lie down in a supine posture for sleeping, examination, examination, etc. .

  A fence 33 such as a side rail is detachably attached to the bed 31 so as to be detachable from the right and left ends of the head side of the bed 31 and the right edge of the foot. A headboard 34 and a footboard 35 are attached to the bed 31 so as to stand up at the head side edge and the foot side edge, respectively.

  As shown in FIG. 2, the apparatus 10 includes a load detection unit 20, a first determination unit 11, a second determination unit 12, a third determination unit 13, a fourth determination unit 14, a storage unit 17, a notification unit 23, and the like. doing. The first to fourth determination means 11 to 14 and the storage means 17 are mounted on a controller 22 that is separate from the load detection means 20 and the notification means 23.

  The load detection means 20 includes a left head side load detection unit 20a that detects a load applied to the left head side portion of the bed portion 31 as a left head side load, and a load applied to the right head side portion of the bed portion 31 as a right head side load. A right head side load detection unit 20b that detects the load on the left foot side of the bed portion 31, a left foot side load detection unit 20c that detects a load on the left foot side of the bed portion 31, and a load on the right foot side of the bed portion 31 on the right foot side. A right foot side load detector 20d that detects the load. These load detection units 20a to 20d have the same configuration, and are configured to detect a load at a predetermined detection cycle (that is, a sampling cycle). This load detection cycle is set, for example, within a range of 0.005 to 10 s, and specifically, for example, 0.5 s.

  Each load detection part 20a-20d consists of a load cell type load detector, for example, The communication part (not shown) with which each load detection part 20a-20d was equipped with the load which each load detection part 20a-20d detected was equipped. It is comprised so that it may transmit to the controller 22 for every load detection period. In the present embodiment, the communication unit is a wireless communication unit, and transmission to the controller 22 is performed using a wireless signal. In the present invention, the communication unit may be a wired communication unit.

  Each of the load detection units 20a to 20d is equipped with an operation power supply (not shown) for each of the load detection units. The power source is, for example, a battery, and specifically a dry battery (eg, single to single 5 dry battery), a secondary battery, or the like.

  The controller 22 includes a computer having a RAM, a ROM, a CPU, and the like, and a program for performing predetermined calculation, determination, and the like is installed in the computer.

  A power supply cable (not shown) for supplying operating power for the controller 22 from an external power source is connected to the controller 22. And the controller 22 is comprised so that it may operate | move with the electric power supplied from the electric power feeding cable. In the present invention, the controller 22 may be equipped with a battery as its operating power source.

Here, the left head side load, the right head side load, the left foot side load, and the right foot side load detected by each of the load detection units 20a to 20d are LH, RH, LF, and RF, respectively. Furthermore, the current left head side load, right head side load, left foot side load, and right foot side load are LH ₀ , RH ₀ , LF _0, and RF ₀ , respectively. Furthermore, the left head side load, right head side load, left foot side load, and right foot side load before a predetermined time are respectively represented as LH ₋ , RH ₋ , LF _−, and RF ₋ . The predetermined time before is selected from, for example, a range of 3 to 30 seconds before, specifically, 5 seconds before, 10 seconds before, 15 seconds before, or the like. In this embodiment, it is 5 seconds ago.

  Each of these loads is a value obtained by performing a taring process using the bed 31 as a tare. That is, the load applied to each part of the bed 31 that has been detected in advance by the load detectors 20a to 20d when the subject H is not on the bed 31 is the bed 31 itself (ie, tare). When each load is set, LH, RH, and LH, RH, by subtracting each load of the bed part 31 alone from the load detected by the load detection parts 20a to 20d when the subject H is on the bed part 31 LF and RF are calculated. Therefore, when the subject H is not present on the bed 31, LH, RH, LF, and RF are all zero. Such a taring process is performed by the determination means 11 to 14 before a predetermined determination is made.

  Further, the first determination formula is represented by the following formula (1).

(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)

  The second A judgment formula and the second B judgment formula are set as the following formulas (2A) and (2B), respectively.

LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ —RH ₀ > N2 (2B).

  The 3A determination expression, the 3B determination expression, the 3C determination expression, the 3D determination expression, the 3E determination expression, and the 3F determination expression are respectively expressed by the following expressions (3A), (3B), (3C), (3D), (3E) and (3F).

LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Formula (3C).

LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Formula (3F).

  The fourth determination formula is represented by the following formula (4).

(LH ₋ + RH ₋ + LF ₋ + R F ₋ ) − (LH ₀ + RH ₀ + LF ₀ + R F ₀ ) <N6 (4)

  In these determination formulas, N1 to N6 are first to sixth set values, respectively, and all take positive values set in advance (that is, N1 to N6> 0). Further, the symbol “||” in the third C determination formula (3C) and the third F determination formula (3F) means an absolute value.

  The method for determining the first set value N1 is selected from the following three A1 to C1. Note that N1 is preferably an arbitrary value within a range exceeding 0 and ½ times the weight of the subject H.

  A1: N1 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N1. If the predetermined ratio is 1/10, N1 is set to 3 kg when the weight of the subject H is 30 kg.

  B1: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N1. For example, N1 is set to 3 kg when the body weight of the subject H is within the range of 25 to 35 kg, N1 is set to 4 kg when the weight is within the section of 35 to 45 kg, and N1 is set to 5 kg when within the section of 45 to 55 kg.

  C1: N1 is a constant value (fixed value) regardless of the weight of the subject H. For example, N1 is set to 3 kg regardless of the weight of the subject H.

  The method for determining the second set value N2 is selected from the following three A2 to C2. Note that N2 is preferably an arbitrary value in the range of more than 0 and up to 1/4 times the weight of the subject H.

  A2: N2 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N2. If the predetermined ratio is 1/20, N2 is set to 1.5 kg when the weight of the subject H is 30 kg.

  B2: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N2. For example, N2 is set to 1.5 kg when the body weight of the subject H is in the section of 25 to 35 kg, and N2 is set to 2.5 kg when the weight is within the section of 35 to 45 kg.

  C2: N2 is a constant value (fixed value) regardless of the weight of the subject H. For example, N2 is set to 1.5 kg regardless of the weight of the subject H.

  The method for determining the third set value N3 is selected from the following three A3 to C3. Note that N3 is preferably an arbitrary value in a range exceeding 0 and up to 1/4 times the weight of the subject H.

  A3: N3 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N3. If the predetermined ratio is 1/20, N3 is set to 1.5 kg when the weight of the subject H is 30 kg.

  B3: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N3. For example, N3 is set to 1.5 kg when the body weight of the subject H is in the section of 25 to 35 kg, and N3 is set to 2.5 kg when the weight is within the section of 35 to 45 kg.

  C3: N3 is set to a constant value (fixed value) regardless of the weight of the subject H. For example, N3 is set to 1.5 kg regardless of the weight of the subject H.

  The method for determining the fourth set value N4 is selected from the following three A4 to C4. N4 is preferably an arbitrary value in the range of more than 0 and up to 1/6 times the weight of the subject H.

  A4: N4 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N4. If the predetermined ratio is 1/20, N4 is set to 1.5 kg when the weight of the subject H is 30 kg.

  B4: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N4. For example, N4 is set to 1.5 kg when the weight of the subject H is in the section of 25 to 35 kg, and N4 is set to 2.5 kg when the weight is within the section of 35 to 45 kg.

  C4: Regardless of the weight of the subject H, N4 is set to a constant value (fixed value). For example, N4 is set to 1.5 kg regardless of the weight of the subject H.

  The method for determining the fifth set value N5 is selected from the following three A5 to C5. Note that N5 is desirably an arbitrary value within a range exceeding 0 and ½ times the weight of the subject H.

  A5: N5 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N5. If the predetermined ratio is 1/20, N5 is set to 1.5 when the weight of the subject H is 30 kg.

  B5: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N5. For example, N5 is set to 1.5 when the body weight of the subject H is in the section of 25 to 35 kg, and N5 is set to 2.5 when the weight is within the section of 35 to 45 kg, and N5 is set to 2.5 when the weight is within the section of 45 to 55 kg.

  C5: Regardless of the weight of the subject H, N5 is set to a constant value (fixed value). For example, N5 is set to 1.5 regardless of the weight of the subject H.

  The method for determining the sixth set value N6 is selected from the following three A6 to C6. Note that N6 is preferably an arbitrary value within a range exceeding 0 and ½ times the weight of the subject H.

  A6: N6 is set according to the weight of the subject H. For example, a predetermined ratio with respect to the weight of the subject H is N6. When the predetermined ratio is 1/5, N6 is set to 6 kg when the weight of the subject H is 30 kg.

  B6: The body weight of the subject H is divided into predetermined weight sections, and a value assigned in advance for each section is defined as N6. For example, N6 is set to 3 kg when the body weight of the subject H is in the section of 25 to 35 kg, N6 is set to 4 kg when the weight is within the section of 35 to 45 kg, and N6 is set to 5 kg when within the section of 45 to 55 kg.

  C6: N6 is set to a constant value (fixed value) regardless of the weight of the subject H. For example, N6 is set to 3 kg regardless of the weight of the subject H.

  The first determination unit 11 determines whether or not the first determination formula (1) is satisfied.

  The second determination means 12 determines whether or not both the second A determination formula (2A) and the second B determination formula (2B) are satisfied.

  The third determination means 13 determines whether or not all of the 3A determination expression (3A), the 3B determination expression (3B), and the 3C determination expression (3B) are satisfied, or the 3D determination expression (3D), It is determined whether or not all of the third E determination formula (3E) and the third F determination formula (3F) are satisfied.

  The fourth determination means 14 determines whether or not the fourth determination formula (4) is satisfied.

  The determination by each determination means 11-14 is performed with the same period as the load detection period by a load detection part.

  The notification means 23 notifies a warning to a notification target person by sound or light in any of the following five cases 1 to 5.

  Case 1: When the first determination formula (1) is satisfied, both the second A determination formula (2A) and the second B determination formula (2B) are satisfied, and the fourth determination formula (4) is satisfied.

  Case 2: The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third A judgment formula (3A), the third B judgment formula ( 3B) and when the third C determination formula (3C) is satisfied and the fourth determination formula (4) is satisfied.

  Case 3: The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third D judgment formula (3D), the third E judgment formula ( 3E) and the third F determination formula (3F) are all satisfied and the fourth determination formula (4) is satisfied.

  Case 4: Satisfying the first judgment formula (1), satisfying all of the third A judgment formula (3A), the third B judgment formula (3B), and the third C judgment formula (3C) and satisfying the fourth judgment formula (4) If yes.

  Case 5: Satisfying the first judgment formula (1), satisfying all of the third D judgment formula (3D), the third E judgment formula (3E), and the third F judgment formula (3F) and satisfying the fourth judgment formula (4) If yes.

  This notification means 23 has an alarm speaker (not shown), an alarm lamp (not shown), and the like. The notification target person is a monitor who is monitoring the subject H, a caregiver who cares for the subject H (including assistance) (eg, a nurse, the family of the subject H, a relative). In the present embodiment, the notification target person is a caregiver. This notification means 23 is installed at a place where a caregiver is present (eg, a nurse station, a place where caregivers are packed) or mounted on a mobile phone. In this embodiment, the alerting | reporting means 23 is installed in the nurse station, for example. Further, the notification means 23 is also used as the notification means previously installed in the nurse call device.

  When the alarm is notified to the caregiver (notification subject) by the notification means 23, the caregiver determines that the subject H is currently going to get out of bed, goes to the place where the bed 30 is installed, and the subject H Perform predetermined assistance and processing according to the purpose of getting out of bed. For example, when the purpose of getting out of bed is for the subject H to defecate or urinate, the caregiver guides the subject H to toilet as assistance to the subject H.

  The storage unit 17 stores data (eg, loads detected by the load detection units 20a to 20d) and numerical values (eg, first to sixth set values N1 to N6) necessary for predetermined determination and calculation. It has a storage medium (eg, SD memory card), an input unit (not shown) for inputting and setting the first to sixth setting values N1 to N6, and the like.

  Next, based on some operation examples (first to sixth operation examples) of the subject H on the bed bed 31, a detection method using the apparatus 10 of the above embodiment will be described with reference to FIGS. This will be described below.

  It should be noted that the detection methods based on these operation examples shown below all include a first determination step in which the first determination unit 11 determines whether or not the first determination formula (1) is satisfied, and a second A determination. A second determination step by which the second determination means 12 determines whether or not both the expression (2A) and the second B determination expression (2B) are satisfied; a third A determination expression (3A); a third B determination expression (3B); Whether the third C determination formula (3C) is all satisfied, or whether the third D determination formula (3D), the third E determination formula (3E), and the third F determination formula (3F) are all satisfied. 3rd determination process determined by the 3 determination means 13, the 4th determination process determined by the 4th determination means 14 whether the 4th determination formula (4) is satisfy | filled, and the cases 1-5 A notification step of notifying the alarm by the notification means 23. There. Furthermore, the first to sixth set values N1 to N6 are all constant values (fixed values) regardless of the weight of the subject H. Specifically, N1 = 3 kg, N2 = 1.5 kg, N3 = 1.5 kg, N4 = 1.5 kg, N5 = 1.5 and N6 = 3 kg.

<First operation example>
3A and 3B are diagrams illustrating a first operation example of the subject H. FIG.

  As shown in FIG. 3A, in the first operation example, the subject H performs a back-up operation from a state in which the subject H lies in a supine posture parallel to the length direction of the bed portion 31 at the center portion on the bed portion 31. Is shown. This operation is referred to as “basic back raising operation” for convenience of explanation. In FIG. 3B, the subject H starts the “basic back raising operation” when the elapsed time is about 9 seconds.

In this operation, the current total head-side load LH ₀ + RH ₀ is smaller than the total head-side load LH ₋ + RH ₋ before a predetermined time (see FIG. 3B). In the first determination step, when the amount of decrease is equal to or greater than the first set value N1, the first determination unit 11 determines that the first determination formula (1) is satisfied. Thus, when satisfy | filling the 1st determination formula (1), it is estimated that the test subject H performed the back raising operation | movement.

Further, in the case of this operation, the current left temporal load LH ₀ is smaller than the left temporal load LH ₋ before the predetermined time, and the current right temporal load RH ₀ is the right temporal load RH before the predetermined time. _- (See FIG. 3B). In the second determination step, when each decrease amount exceeds the second set value N2, the second determination means 12 satisfies both the second A determination formula (2A) and the second B determination formula (2B). Is determined.

Furthermore, in the case of this operation, the current total load LH ₀ + RH ₀ + LF ₀ + R F ₀ is substantially equal to the total load LH ₋ + RH ₋ + LF ₋ + R F ₋ before a predetermined time. Therefore, in the fourth determination step, the fourth determination unit 14 determines that the fourth determination formula (4) is satisfied.

  Therefore, the first operation example corresponds to case 1. Therefore, the notification means 23 notifies the alarm that the subject H's back-up motion is detected.

  In FIG. 3B, the back-up operation is detected when the elapsed time is about 11 seconds. K in the figure indicates the detection time of the back raising operation.

<Second operation example>
4A and 4B are diagrams illustrating a second operation example of the subject H. FIG.

  As shown in FIG. 4A, in the second operation example, the subject H lies down to the left diagonal foot from a state where the subject H lies on the bed 31 in a supine posture obliquely with respect to the length direction of the bed 31. This shows the case of operation. This operation is referred to as “obliquely turning operation” for convenience of explanation. In FIG. 4B, the subject H starts the “oblique turning operation” when the elapsed time is about 2 seconds.

In this operation, the current total head-side load LH ₀ + RH ₀ is smaller than the total head-side load LH ₋ + RH ₋ before a predetermined time (see FIG. 4B). In the first determination step, when the amount of decrease is equal to or greater than the first set value N1, the first determination unit 11 determines that the first determination formula (1) is satisfied. Thus, when satisfy | filling the 1st determination formula (1), it is estimated that the test subject H performed the back raising operation | movement.

Further, in the case of this operation, the current right temporal load RH ₀ is smaller than the right temporal load RH ₋ before the predetermined time (see FIG. 3B). On the other hand, the current left occipital load LH ₀ increases from the left occipital load LH _{− a} predetermined time ago. Therefore, in the second determination step, at least the second A determination expression (2A) is not satisfied among the second A determination expression (2A) and the second B determination expression (2B). Therefore, the second determination means 12 determines that the second A determination formula (2A) is not satisfied.

In addition, since the current left occipital load LH ₀ is greater than the left occipital load LH ₋ before a predetermined time, at least the third A determination expression (3A) among the third A to third C determination expressions (3A to 3C) is satisfied. Do not meet.

On the other hand, among the 3D to 3F determination expressions (3D to 3F), the 3D determination expression (3A) and the 3E determination expression (3E) may be satisfied. Since the subject H was rolled over operation rather than a back lifting operation, the absolute value of the reduction amount of Hidariatama side load | LH - _{-LH 0} | reduction RH of the right head side load against - _{magnification-RH 0} is Is relatively small. Therefore, in the third F determination formula (3F), the third F determination formula (3F) can be prevented from being satisfied by appropriately setting the fifth set value N5. In this way, by setting N5 so as not to satisfy the third F determination formula (3F), in the third determination step, the third determination means 13 includes the third A to third C determination expressions (3A to 3C). It is determined that at least the third A determination formula (3A) is not satisfied and at least the third F determination formula (3F) among the third D to third F determination formulas (3D to 3F) is not satisfied.

Furthermore, in the case of this operation, the current total load LH ₀ + RH ₀ + LF ₀ + R F ₀ is substantially equal to the total load LH ₋ + RH ₋ + LF ₋ + R F ₋ before a predetermined time. Therefore, in the fourth determination step, the fourth determination unit 14 determines that the fourth determination formula (4) is satisfied.

  Therefore, in the case of the second operation example, none of the cases 1 to 5 is applicable. Therefore, the notification means 23 does not notify a warning.

  In addition, when this “oblique turning operation” is performed in the opposite direction, it does not correspond to any of cases 1 to 5 for the same reason as described above. Therefore, the notification unit 23 does not notify the alarm.

<Third operation example>
5A and 5B are diagrams illustrating a third operation example of the subject H. FIG.

  As shown in FIG. 5A, in the third operation example, the subject H twists his upper body to the left side from a state where the subject H lies in a supine posture in a central portion on the bed portion 31 in parallel with the length direction of the bed portion 31. The case where the hand is put on the fence 33 and the back is raised is shown. This operation is frequently performed when the subject H is a weak elderly person. This operation is referred to as “upper body twisting back operation” for convenience of explanation. In FIG. 5A, the subject H starts the “upper body twisting back raising operation” when the elapsed time is about 10 seconds.

In this operation, the current total head-side load LH ₀ + RH ₀ is smaller than the total head-side load LH ₋ + RH ₋ before a predetermined time (see FIG. 4B). In the first determination step, when the amount of decrease is equal to or greater than the first set value N1, the first determination unit 11 determines that the first determination formula (1) is satisfied. Thus, when satisfy | filling the 1st determination formula (1), it is estimated that the test subject H performed the back raising operation | movement.

Further, in the case of this operation, the current right temporal load RH ₀ is smaller than the right temporal load RH ₋ before the predetermined time (see FIG. 3B). On the other hand, the current left occipital load LH ₀ increases from the left occipital load LH _{− a} predetermined time ago. Therefore, in the second determination step, at least the second A determination expression (2A) is not satisfied among the second A determination expression (2A) and the second B determination expression (2B). Therefore, the second determination means 12 determines that the second A determination formula (2A) is not satisfied.

In addition, since the current left occipital load LH ₀ is larger than the left occipital load LH ₋ before a predetermined time, at least the third A determination expression (3A) of the third A to 3C determination expressions (3A to 3C) is Do not meet.

On the other hand, among the 3D to 3F determination expressions (3D to 3F), the 3D determination expression (3D) and the 3E determination expression (3E) may be satisfied. Since the subject H was a back lifting operation rather than a turn operation, the absolute value of the reduction amount of Hidariatama side load | LH - _{-LH 0} | reduction RH of the right head side load against - _{magnification-RH 0} is Is relatively large. Therefore, in the third F determination formula (3F), the third F determination formula (3F) can be satisfied by appropriately setting the fifth set value N5. Thus, by setting N5 so as to satisfy the third F determination formula (3F), in the third determination step, the third determination means 13 satisfies all of the third D to third F determination expressions (3D to 3F). It is determined that

Furthermore, in the case of this operation, the current total load LH ₀ + RH ₀ + LF ₀ + R F ₀ is substantially equal to the total load LH ₋ + RH ₋ + LF ₋ + R F ₋ before a predetermined time. Therefore, in the fourth determination step, the fourth determination unit 14 determines that the fourth determination formula (4) is satisfied.

  Therefore, the third operation example corresponds to case 3 or 5. Therefore, the notification means 23 notifies the alarm that the subject H's back-up motion is detected.

  In FIG. 5B, the back raising operation is detected when the elapsed time is about 15 seconds. K in the figure indicates the detection time of the back raising operation.

  It should be noted that the case where the “upper body twisting back raising operation” is performed in the left-right direction corresponds to Case 2 or 4 for the same reason as described above. Therefore, the notification means 23 also notifies an alarm.

<Fourth operation example>
6A and 6B are diagrams illustrating a fourth operation example of the subject H. FIG.

  As shown in FIG. 6A, in the fourth operation example, the subject H turns over to the right side from the state where the subject H lies in a supine posture in the center on the bed portion 31 in parallel with the length direction of the bed portion 31. Shows the case. This operation is referred to as “side-down operation” for convenience of explanation. In FIG. 6B, the subject H starts the “side-down operation” when the elapsed time is about 12 seconds.

In this operation, the current total head-side load LH ₀ + RH ₀ is substantially equal to the total head-side load LH ₋ + RH ₋ a predetermined time before. Therefore, in the first determination step, the first determination unit 11 determines that the first determination formula (1) is not satisfied.

  Therefore, in the case of the fourth operation example, none of the cases 1 to 5 is applicable. Therefore, the notification means 23 does not notify a warning.

  Note that when this “side-down operation” is performed in the opposite direction, it does not fall under any of cases 1 to 5 for the same reason as described above. Therefore, the notification unit 23 does not notify the alarm.

<Fifth operation example>
FIG. 7 is a diagram illustrating a fifth operation example of the subject H.

  As shown in FIG. 7, in the fifth operation example, the subject H is not operating at all, but a load such as a luggage, a biometric device, or the like previously placed on the central portion of the head side portion of the bed portion 31 is placed. The case where the figurine 39 was removed from the bed part 31 is shown.

In this case, the current total head-side load LH ₀ + RH ₀ is smaller than the total head-side load LH ₋ + RH ₋ before a predetermined time. In the first determination step, when the amount of decrease is equal to or greater than the first set value N1, the first determination unit 11 determines that the first determination formula (1) is satisfied. Thus, when satisfy | filling the 1st determination formula (1), it is estimated that the test subject H performed the back raising operation | movement.

Further, in this case, the current left temporal load LH ₀ is smaller than the left temporal load LH ₋ before the predetermined time, and the current right temporal load RH ₀ is more than the right temporal load RH ₋ before the predetermined time. Also decreases. In the second determination step, when each of the reduction amounts is larger than the second set value N2, the second determination means 12 satisfies both the second A determination formula (2A) and the second B determination formula (2B). judge.

However, the current total load LH ₀ + RH ₀ + LF ₀ + R F ₀ is smaller than the total load LH ₋ + RH ₋ + LF ₋ + R F ₋ before the predetermined time. Here, the fourth determination formula (4) can be prevented from being satisfied by appropriately setting the sixth set value N6. Thus, by setting N6 so as not to satisfy the fourth determination formula (4), in the fourth determination step, the fourth determination unit 14 determines that the fourth determination formula (4) is not satisfied.

  Therefore, in the case of the fifth operation example, none of the cases 1 to 5 is applicable. Therefore, the notification means 23 does not notify a warning.

  As can be seen from the above operation examples, the detection method of the present embodiment has the following advantages.

  By determining by the first determination means 11 that the first determination formula (1) is satisfied in the first determination step, it is estimated that the subject H has performed a back-up operation.

  Further, the second determination unit 12 determines that both the second A determination formula (2A) and the second B determination formula (2B) are satisfied in the second determination step, and thereby the “oblique rollover operation” illustrated in FIG. 4A. Misinformation can be prevented.

  Further, in the third determination step, if all of the 3A to 3C determination expressions (3A to 3C) are satisfied, or if all of the 3D to 3F determination expressions (3D to 3F) are satisfied, the third determination means. By the determination based on 13, it is possible to detect the “upper body twisting and raising operation” shown in FIG. 5A.

  Furthermore, by determining by the fourth determination means 14 that the fourth determination formula (4) is not satisfied in the fourth determination step, it is possible to prevent erroneous reporting due to removal of the mounted article 39 as shown in FIG. .

  Therefore, the detection method of this embodiment can remarkably improve the detection performance of the subject H's back raising operation.

  Furthermore, the first to sixth set values N1 to N6 are all constant values (fixed values) regardless of the weight of the subject H. Thereby, the preparatory operation and structure of the apparatus 10 can be simplified. However, in the present invention, N1 to N6 may be set according to the weight of the subject H. By doing so, the detection sensitivity of the back raising operation can be set according to the weight of the subject H, and thereby the detection performance of the back raising operation of the subject H can be further improved.

  Furthermore, it is not necessary to calculate the position of the center of gravity of the subject H on the bed 31 or to input the width or length of the bed 31 for calculating the position of the center of gravity. Compared with the devices disclosed in Patent Documents 3 and 4 above, the structure of the device 10 can be simplified, and can be easily applied to the bed portion 31 of various sizes.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

  In the present invention, the bed is not limited to the bed part of the bed, and may be another bed.

  INDUSTRIAL APPLICABILITY The present invention can be used for a bed occupancy status detection method and a bed occupancy status detection device for detecting a subject's occupancy status (eg, back-up motion) on a couch (eg, a bed couch). .

10: Bed presence detection device 11: First determination means 12: Second determination means 13: Third determination means 14: Fourth determination means 20: Load detection means 22: Controller 23: Notification means 30: Bed 31: Bed part (bed)
39: Mounted object H: Subject

Claims (10)

A load detection step of detecting a load applied to the left temporal side and the right temporal side of the bed where the subject is present at a predetermined detection cycle as a left temporal load and a right temporal load, respectively;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first and second preset values set in advance are N1 and N2, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
A second determination step for determining whether or not both are satisfied,
When the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied, a notification step of notifying an alarm;
A method for detecting the presence of a bed, comprising: A load detection step of detecting a load applied to the left temporal side and the right temporal side of the bed where the subject is present at a predetermined detection cycle as a left temporal load and a right temporal load, respectively;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. _0, RH _- and then,
When the preset positive first and third to fifth set values are N1 and N3 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
A third determination step for determining whether or not all of the above are satisfied;
Either the first judgment formula (1) is satisfied and the third A judgment formula (3A), the third B judgment formula (3B), and the third C judgment formula (3C) are all satisfied, or the first judgment formula (1 ) And when the 3D determination formula (3D), the 3E determination formula (3E), and the 3F determination formula (3F) are all satisfied, a notification step of notifying an alarm;
A method for detecting the presence of a bed, comprising: A load detection step of detecting a load applied to the left temporal side and the right temporal side of the bed where the subject is present at a predetermined detection cycle as a left temporal load and a right temporal load, respectively;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before the predetermined time detected in the load detection step are respectively expressed as LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first to fifth set values set in advance are N1 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
A first determination step for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
A second determination step for determining whether or not both are satisfied,
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
A third determination step for determining whether or not all of the above are satisfied;
A case where the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied;
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third A judgment formula (3A), the third B judgment formula ( 3B) and the case where all the third C determination formulas (3C) are satisfied,
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third D judgment formula (3D), the third E judgment formula ( 3E) and the case where all the third F determination formulas (3F) are satisfied,
When the first determination formula (1) is satisfied and all of the third A determination formula (3A), the third B determination formula (3B), and the third C determination formula (3C) are satisfied,
If either the first judgment formula (1) is satisfied and the third D judgment formula (3D), the third E judgment formula (3E), and the third F judgment formula (3F) are all satisfied, an alarm An informing process for informing;
A method for detecting the presence of a bed, comprising: The load detection step further detects a load applied to the left foot side portion and the right foot side portion of the bed at a predetermined detection cycle as a left foot side load and a right foot side load, respectively.
The method for detecting the presence of a bed is as follows:
The current left foot side load, the left foot side load before a predetermined time, the current right foot side load, and the right foot side load before the predetermined time detected in the load detection step are LF ₀ , LF ₋ , RF ₀ and RF ₋ , respectively. age,
When the preset positive sixth set value is N6,
Next fourth judgment formula (4)
(LH ₋ + RH ₋ + LF ₋ + R F ₋ ) − (LH ₀ + RH ₀ + LF ₀ + R F ₀ ) <N6 Equation (4)
Including a fourth determination step of determining whether or not
The method for detecting the presence of a bed according to any one of claims 1 to 3, wherein the notification step further notifies an alarm when the fourth determination formula (4) is satisfied.   The method of detecting a bed stagnation state according to any one of claims 1 to 4, wherein each set value is set according to the weight of the subject. A load detecting means for detecting the load applied to the left temporal side and the right temporal side of the bed where the subject is present as a left temporal load and a right temporal load, respectively, with a predetermined detection period;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first and second preset values set in advance are N1 and N2, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
Second determination means for determining whether or not both are satisfied,
Informing means for notifying an alarm when the first judgment formula (1) is satisfied and the second A judgment formula (2A) and the second B judgment formula (2B) are both satisfied,
A bed presence detection device comprising: A load detecting means for detecting the load applied to the left temporal side and the right temporal side of the bed where the subject is present as a left temporal load and a right temporal load, respectively, with a predetermined detection period;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. _0, RH _- and then,
When the preset positive first and third to fifth set values are N1 and N3 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
Third determination means for determining whether or not all of the above are satisfied;
Either the first judgment formula (1) is satisfied and the third A judgment formula (3A), the third B judgment formula (3B), and the third C judgment formula (3C) are all satisfied, or the first judgment formula (1 ) And the third D determination formula (3D), the third E determination formula (3E), and the third F determination formula (3F) are all satisfied, a notification means for reporting a warning,
A bed presence detection device comprising: A load detecting means for detecting the load applied to the left temporal side and the right temporal side of the bed where the subject is present as a left temporal load and a right temporal load, respectively, with a predetermined detection period;
The current left occipital load, the left occipital load before a predetermined time, the current occipital load before the predetermined time, and the right occipital load before a predetermined time detected by the load detecting means are respectively LH ₀ , LH ₋ , RH. ₀ and RH _- and then,
When the positive first to fifth set values set in advance are N1 to N5, respectively,
The following first judgment formula (1)
(LH ₋ + RH ₋ ) − (LH ₀ + RH ₀ ) ≧ N1 (1)
First determination means for determining whether or not
Next 2A judgment formula (2A) and 2B judgment formula (2B)
LH ₋ −LH ₀ > N2 Formula (2A)
RH ₋ −RH ₀ > N2 Formula (2B)
Second determination means for determining whether or not both are satisfied,
Next 3A judgment formula (3A), 3B judgment formula (3B) and 3C judgment formula (3C)
LH ₋ −LH ₀ > N3 Formula (3A)
RH _- -RH ₀ <N4 ... formula (3B)
LH ₋ −LH ₀ > N5 × | RH ₋ −RH ₀ | Expression (3C)
Or the following 3D determination formula (3D), 3E determination formula (3E) and 3F determination formula (3F)
LH ₋ −LH ₀ <N4 Formula (3D)
RH ₋ —RH ₀ > N3 Formula (3E)
RH ₋ −RH ₀ > N5 × | LH ₋ −LH ₀ | Expression (3F)
Third determination means for determining whether or not all of the above are satisfied;
A case where the first determination formula (1) is satisfied and both the second A determination formula (2A) and the second B determination formula (2B) are satisfied;
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third A judgment formula (3A), the third B judgment formula ( 3B) and the case where all the third C determination formulas (3C) are satisfied,
The first judgment formula (1) is satisfied and at least one of the second A judgment formula (2A) and the second B judgment formula (2B) is not met, and the third D judgment formula (3D), the third E judgment formula ( 3E) and the case where all the third F determination formulas (3F) are satisfied,
When the first determination formula (1) is satisfied and all of the third A determination formula (3A), the third B determination formula (3B), and the third C determination formula (3C) are satisfied,
If either the first judgment formula (1) is satisfied and the third D judgment formula (3D), the third E judgment formula (3E), and the third F judgment formula (3F) are all satisfied, an alarm An informing means for informing
A bed presence detection device comprising: The load detecting means further detects a load applied to the left foot side portion and the right foot side portion of the bed at a predetermined detection cycle as a left foot side load and a right foot side load, respectively.
The bed presence detection device further comprises:
The current left foot side load, the left foot side load before a predetermined time, the current right foot side load before the predetermined time, and the right foot side load before the predetermined time detected by the load detecting means are LF ₀ , LF ₋ , RF ₀ and RF ₋ , respectively. age,
When the preset positive sixth set value is N6,
Next fourth judgment formula (4)
(LH ₋ + RH ₋ + LF ₋ + R F ₋ ) − (LH ₀ + RH ₀ + LF ₀ + R F ₀ ) <N6 Equation (4)
Including fourth determination means for determining whether or not
The bed presence detection apparatus according to any one of claims 6 to 8, wherein the notification means further notifies a warning when the fourth determination formula (4) is satisfied. The bed setting occupancy status detection device according to any one of claims 6 to 9, wherein each set value is set according to a weight of a subject.

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