JP5204262B2 - Bed presence detection method and bed presence detection device - Google Patents

Description

  The present invention provides, for example, a bed status detection method, a bed status detection device, and a bed status monitoring system for detecting a bed status (e.g., bed leaving, bed presence, body movement) of a subject on a bed sleeping portion. About.

  To detect bed conditions such as getting out of bed, bed (entrance), center of gravity, etc. of subjects (eg: sick, elderly, cared, healthy, infants) who are on the bed part of the bed For example, the following methods are known.

  That is, the first to fourth load detectors are disposed under the head-side right leg, the head-side left leg, the foot-side right leg, and the foot-side left leg, respectively. These four load detectors detect loads applied to the head side right part, head side left part, foot side right part and foot side left part of the bed bed. And the gravity center position of the test subject on a bed bed part is calculated using the output load (load value) from these four load detectors. The coordinates (GX, GY) of the barycentric position are calculated by the following equations (101) (102).

GX = (W1 + W2-W3-W4) × (1 / WT) × (BX / 2) Formula (101)
GY = (W1 + W3-W2-W4) × (1 / WT) × (BY / 2) Equation (102)

However,
W1: Output load from the first load detector (load value)
W2: Output load from the second load detector (load value)
W3: Output load from the third load detector (load value)
W4: Output load from the fourth load detector (load value)
BX: bed leg length direction (ie, X-axis direction) BY: bed leg width direction (ie, Y-axis direction) WT = W1 + W2 + W3 + W4
It is.

  Based on the position of the center of gravity calculated by the center-of-gravity position calculation formulas (101) and (102), the moving distance, the moving speed, etc. on the bed of the subject are calculated, and the presence of the subject is calculated based on the calculation result. It detects (for example, refer patent document 1 and 2).

  By the way, if the value corresponding to the sleeping posture of the subject on the bed sleeping portion can be detected, it is beneficial in the following points. That is, for example, it is possible to predict the subject's getting out of bed, or to know that the subject may fall from the bed sleeping portion. Therefore, it is important to detect the corresponding value of the subject's sleeping posture.

Japanese Patent No. 3322632 Japanese Patent No. 3093745

  However, in the conventional detection method described above, the presence of the subject is detected based on the position of the center of gravity of the subject calculated by the arithmetic expressions (101) and (102) using the output loads from the four load detectors. Thus, depending on the type of sleeping subject, the value corresponding to the sleeping posture may not be detected.

  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 status that can detect values corresponding to various sleeping postures of a subject, and the presence of a bed used in the detection method. It is to provide a floor condition detection apparatus, and a bed occupancy condition monitoring system using the detection apparatus.

  The present invention provides the following means.

[1] A load detection step of detecting 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 by the first to fourth load detection means, respectively.
When the load values output from the first to fourth load detecting means are W1, W2, W3 and W4, respectively.
W1 / W3 ≦ n1 (1)
However, 0 <n1 <1 (n1: preset value)
A first determination step of determining whether or not the first determination formula (1) is satisfied;
W3 / W1 ≦ n2 (2)
However, 0 <n2 <1 (n2: preset value)
A second determination step of determining whether or not the second determination formula (2) is satisfied;
W2 / W4 ≦ n3 (3)
However, 0 <n3 <1 (n3: preset value)
A third determination step for determining whether or not the third determination formula (3) is satisfied;
W4 / W2 ≦ n4 Formula (4)
However, 0 <n4 <1 (n4: preset value)
A fourth determination step for determining whether or not the fourth determination formula (4) is satisfied;
W1 / W2 ≦ n5 (5)
However, 0 <n5 <1 (n5: preset value)
A fifth determination step for determining whether or not the fifth determination formula (5) is satisfied;
W2 / W1 ≦ n6 Formula (6)
However, 0 <n6 <1 (n6: preset value)
A sixth determination step for determining whether or not the sixth determination formula (6) is satisfied;
W3 / W4 ≦ n7 (7)
However, 0 <n7 <1 (n7: preset value)
A seventh determination step for determining whether or not the seventh determination formula (7) is satisfied;
W4 / W3 ≦ n8 (8)
However, 0 <n8 <1 (n8: preset value)
An eighth determination step of determining whether or not the eighth determination formula (8) is satisfied;
When it is determined that the determination result of at least one determination step among the first to eighth determination steps satisfies the determination formula, a first notification step of notifying information on the subject's bed situation;
A bed occupancy status detection method comprising:

  [2] The bed according to item 1 above, further comprising a first communication step of transmitting information related to the presence status of the subject when the determination result of the at least one determination step satisfies the determination formula. A method for detecting the presence of bed.

  [3] The bed occupancy status detection method according to item 1 or 2, wherein the information related to the occupancy status of the subject is information indicating that the subject's occupancy position is in an end region of the bed.

[4] A total load value calculation step of calculating a total load value A obtained by summing the four load values output from the first to fourth load detection means,
A total load value storage step for storing the total load value A calculated in the total load value calculation step;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated in the total load value calculation step is equal to or greater than a predetermined load value for a predetermined time. The presence determination process,
When it is determined in the determination result of the occupancy determination step that the subject is present on the bed bed, the total load value when the predetermined time elapses is the total load value when the subject is present on the bed lie. A floor load value storing step of storing as a floor load value B;
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: preset value)
A ninth determination step for determining whether or not the ninth determination formula (9) is satisfied;
When it is determined that the ninth determination formula is satisfied in the determination result of the ninth determination step,
A <B × m2 Formula (10)
However, 0 <m2 <m1 (m2: preset value)
A tenth determination step for determining whether or not the tenth determination formula (10) is satisfied;
A second notification step of notifying the subject that he / she has left the bed when it is determined that the tenth determination formula is satisfied in the determination result of the tenth determination step;
The bed occupancy status detection method according to any one of the preceding items 1 to 3.

  [5] The method according to item 4, further comprising a second communication step of transmitting information indicating that the subject has left the floor when the determination result of the tenth determination step determines that the tenth determination formula is satisfied. How to detect bed occupancy.

[6] A total load value calculation step of calculating a total load value A obtained by summing the four load values output from the first to fourth load detection means,
A total load value storage step for storing the total load value A calculated in the total load value calculation step;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated in the total load value calculation step is equal to or greater than a predetermined load value for a predetermined time. The presence determination process,
When it is determined in the determination result of the occupancy determination step that the subject is present on the bed bed, the total load value when the predetermined time elapses is the total load value when the subject is present on the bed lie. A floor load value storing step of storing as a floor load value B;
A maximum and minimum total load value calculation step of calculating a maximum total load value Amax and a minimum total load value Amin within a predetermined time of the total load value A calculated in the total load value calculation step;
Amax−Amin ≧ B × q (11)
However, 0 <q (q: a preset value)
An eleventh determination step for determining whether or not the eleventh determination formula (11) is satisfied;
A third notification step of notifying information about the body movement of the subject when it is determined that the eleventh determination formula is satisfied in the determination result of the eleventh determination step;
The bed occupancy status detection method according to any one of the preceding items 1 to 3.

  [7] The bed according to item 6 above, further comprising a third communication step of transmitting information related to the body movement of the subject when it is determined in the determination result of the eleventh determination step that the eleventh determination formula is satisfied. How to detect the presence of a child.

[8] A total load value calculation step of calculating a total load value A obtained by summing the four load values output from the first to fourth load detection means,
A total load value storage step for storing the total load value A calculated in the total load value calculation step;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated in the total load value calculation step is equal to or greater than a predetermined load value for a predetermined time. The presence determination process,
When it is determined in the determination result of the presence determination step that the subject is present on the bed, the load value W1 output from the first load detection unit and the load output from the second load detection unit A head-side load value calculation step of calculating a head-side load value C obtained by summing the values W2;
A head-side load value storage step for storing the head-side load value C calculated in the head-side load value calculation step;
A head side load value decrease amount calculating step of calculating a decrease amount ΔC of the head side load value C calculated in the head side load value calculating step within a predetermined time;
ΔC ≧ A × s (12)
However, 0 <s (s: preset value)
A twelfth determination step for determining whether or not the twelfth determination formula (12) is satisfied;
A fourth notification step for notifying the subject that the subject has raised his / her body when it is determined that the twelfth determination formula is satisfied in the determination result of the twelfth determination step;
The bed occupancy status detection method according to any one of the preceding items 1 to 3.

  [9] The preceding paragraph comprising a fourth communication step of transmitting information indicating that the subject has raised his / her body when it is determined in the determination result of the twelfth determination step that the twelfth determination formula is satisfied. 8. The bed presence state detection method according to 8.

[10] A total load value calculation step of calculating a total load value A obtained by summing the four load values output from the first to fourth load detection means,
A total load value storage step for storing the total load value A calculated in the total load value calculation step;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated in the total load value calculation step is equal to or greater than a predetermined load value for a predetermined time. The presence determination process,
When it is determined in the determination result of the occupancy determination step that the subject is present on the bed bed, the total load value when the predetermined time elapses is the total load value when the subject is present on the bed lie. A floor load value storing step of storing as a floor load value B;
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: preset value)
A ninth determination step for determining whether or not the ninth determination formula is satisfied;
When it is determined that the ninth determination formula is satisfied in the determination result of the ninth determination step,
A <B × m2 Formula (10)
However, 0 <m2 <m1 (m2: preset value)
A tenth determination step for determining whether or not the fifth determination formula (10) is satisfied;
A second notification step of notifying the subject that he / she has left the bed when it is determined that the tenth determination formula is satisfied in the determination result of the tenth determination step;
A maximum and minimum total load value calculation step of calculating a maximum total load value Amax and a minimum total load value Amin within a predetermined time of the total load value A calculated in the total load value calculation step;
Amax−Amin ≧ B × q (11)
However, 0 <q (q: a preset value)
An eleventh determination step for determining whether or not the eleventh determination formula (11) is satisfied;
A third notification step of notifying information about the body movement of the subject when it is determined that the eleventh determination formula is satisfied in the determination result of the eleventh determination step;
When it is determined in the determination result of the presence determination step that the subject is present on the bed, the load value W1 output from the first load detection unit and the load output from the second load detection unit A head-side load value calculation step of calculating a head-side load value C obtained by summing the values W2;
A head-side load value storage step for storing the head-side load value C calculated in the head-side load value calculation step;
A head side load value decrease amount calculating step of calculating a decrease amount ΔC of the head side load value C calculated in the head side load value calculating step within a predetermined time;
ΔC ≧ A × s (12)
However, 0 <s (s: preset value)
A twelfth determination step for determining whether or not the twelfth determination formula (12) is satisfied;
A fourth notification step for notifying the subject that the subject has raised his / her body when it is determined that the twelfth determination formula is satisfied in the determination result of the twelfth determination step;
The bed occupancy status detection method according to any one of the preceding items 1 to 3.

[11] A first communication step of transmitting information related to a subject's occupancy when it is determined that the determination result of the at least one determination step among the first to eighth determination steps satisfies a determination formula. When,
When it is determined that the tenth determination formula is satisfied in the determination result of the tenth determination step, a second communication step that transmits information indicating that the subject has left the bed;
A third communication step of transmitting information on the body movement of the subject when it is determined that the eleventh determination formula is satisfied in the determination result of the eleventh determination step;
A fourth communication step of transmitting information that the subject has raised his / her upper body when it is determined that the twelfth determination formula is satisfied in the determination result of the twelfth determination step;
The bed occupancy status detection method according to item 10 above, comprising:

[12] First to fourth load detecting means for detecting the load 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, respectively;
When the load values output from the first to fourth load detecting means are W1, W2, W3 and W4, respectively.
W1 / W3 ≦ n1 (1)
However, 0 <n1 <1 (n1: preset value)
First determination means for determining whether or not the first determination formula (1) is satisfied;
W3 / W1 ≦ n2 (2)
However, 0 <n2 <1 (n2: preset value)
Second determination means for determining whether or not the second determination formula (2) is satisfied;
W2 / W4 ≦ n3 (3)
However, 0 <n3 <1 (n3: preset value)
Third determination means for determining whether or not the third determination formula (3) is satisfied;
W4 / W2 ≦ n4 Formula (4)
However, 0 <n4 <1 (n4: preset value)
Fourth determination means for determining whether or not the fourth determination formula (4) is satisfied;
W1 / W2 ≦ n5 (5)
However, 0 <n5 <1 (n5: preset value)
Fifth determination means for determining whether or not the fifth determination formula (5) is satisfied;
W2 / W1 ≦ n6 Formula (6)
However, 0 <n6 <1 (n6: preset value)
Sixth determination means for determining whether or not the sixth determination formula (6) is satisfied;
W3 / W4 ≦ n7 (7)
However, 0 <n7 <1 (n7: preset value)
Seventh determination means for determining whether or not the seventh determination formula (7) is satisfied;
W4 / W3 ≦ n8 (8)
However, 0 <n8 <1 (n8: preset value)
Eighth determination means for determining whether or not the eighth determination formula (8) is satisfied;
A first notifying unit for notifying information on a subject's occupancy status when it is determined that the determination result of at least one of the first to eighth determining units satisfies a determination formula;
A bed presence detection device comprising a bed.

  [13] The bed according to [12], further including first communication means for transmitting information related to a subject's occupancy status when the determination result of the at least one determination means determines that the determination formula is satisfied. A presence detection device.

  [14] The bed occupancy status detection apparatus according to item 12 or 13, wherein the information related to the subject's occupancy status is information indicating that the subject's occupancy position is in an end region of the bed.

[15] Total load value calculating means for calculating a total load value A obtained by summing the four load values output from the first to fourth load detecting means;
Total load value storage means for storing the total load value A calculated by the total load value calculation means;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated by the total load value calculation means is equal to or greater than a predetermined load value for a predetermined time. Presence determination means,
When it is determined in the determination result of the bed deciding means that the subject is on the bed sleeping portion, the total load value at the time when the predetermined time elapses is the total load value when the subject is on the bed sleeping portion. Floor load value storage means for storing the floor load value B;
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: preset value)
Ninth determination means for determining whether or not the ninth determination expression (9) is satisfied;
If it is determined in the determination result of the ninth determination means that the ninth determination formula is satisfied,
A <B × m2 Formula (10)
However, 0 <m2 <m1 (m2: preset value)
Tenth determination means for determining whether or not the tenth determination formula (10) is satisfied;
A second notifying means for notifying the subject that the subject has left the bed when it is determined that the tenth determination formula is satisfied in the determination result of the tenth determining means;
15. The bed occupancy status detection device according to any one of items 12 to 14 above.

  [16] The method according to item 15, further comprising: a second communication unit that transmits information indicating that the subject has left the bed when the determination result of the tenth determination unit determines that the tenth determination formula is satisfied. Bed presence detection device.

[17] Total load value calculating means for calculating a total load value A obtained by summing the four load values output from the first to fourth load detecting means;
Total load value storage means for storing the total load value A calculated by the total load value calculation means;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated by the total load value calculation means is equal to or greater than a predetermined load value for a predetermined time. Presence determination means,
When it is determined in the determination result of the bed deciding means that the subject is on the bed sleeping portion, the total load value at the time when the predetermined time elapses is the total load value when the subject is on the bed sleeping portion. Floor load value storage means for storing the floor load value B;
Maximum and minimum total load value calculation means for calculating a maximum total load value Amax and a minimum total load value Amin within a predetermined time of the total load value A calculated by the total load value calculation means;
Amax−Amin ≧ B × q (11)
However, 0 <q (q: a preset value)
Eleventh determination means for determining whether or not the eleventh determination formula (11) is satisfied;
Third informing means for informing information related to body movement of the subject when it is determined that the eleventh judging expression is satisfied in the judgment result of the eleventh judging means;
15. The bed occupancy status detection device according to any one of items 12 to 14 above.

  [18] The bed according to item 17 above, comprising third communication means for transmitting information relating to the body movement of the subject when it is determined in the determination result of the eleventh determination means that the eleventh determination formula is satisfied. Bed presence detection device.

[19] Total load value calculating means for calculating a total load value A obtained by summing the four load values output from the first to fourth load detecting means,
Total load value storage means for storing the total load value A calculated by the total load value calculation means;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated by the total load value calculation means is equal to or greater than a predetermined load value for a predetermined time. Presence determination means,
When it is determined in the determination result of the occupancy determining means that the subject is present on the bed, the load value W1 output from the first load detecting means and the load output from the second load detecting means A head-side load value calculating means for calculating a head-side load value C obtained by summing the values W2;
Head-side load value storage means for storing the head-side load value C calculated by the head-side load value calculation means;
A head-side load value decrease amount calculating means for calculating a decrease amount ΔC within a predetermined time of the head-side load value C calculated by the head-side load value calculating means;
ΔC ≧ A × s (12)
However, 0 <s (s: preset value)
Twelfth determination means for determining whether or not the twelfth determination formula (12) is satisfied;
Fourth informing means for informing information that the subject has raised his / her body when it is determined in the determination result of the twelfth determining means that the twelfth determination formula is satisfied;
15. The bed occupancy status detection device according to any one of items 12 to 14 above.

  [20] The preceding paragraph comprising fourth communication means for transmitting information indicating that the subject has raised his / her body when it is determined in the determination result of the twelfth determination means that the twelfth determination formula is satisfied. 19. The bed presence detection device according to 19.

[21] Total load value calculation means for calculating a total load value A obtained by summing the four load values output from the first to fourth load detection means,
Total load value storage means for storing the total load value A calculated by the total load value calculation means;
It is determined whether or not the subject is present on the bed bed according to whether or not the total load value A calculated by the total load value calculation means is equal to or greater than a predetermined load value for a predetermined time. Presence determination means,
When it is determined in the determination result of the bed deciding means that the subject is on the bed sleeping portion, the total load value at the time when the predetermined time elapses is the total load value when the subject is on the bed sleeping portion. Floor load value storage means for storing the floor load value B;
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: preset value)
Ninth determination means for determining whether or not the ninth determination formula is satisfied;
If it is determined in the determination result of the ninth determination means that the ninth determination formula is satisfied,
A <B × m2 Formula (10)
However, 0 <m2 <m1 (m2: preset value)
Tenth determination means for determining whether or not the tenth determination formula (10) is satisfied;
A second notifying unit for notifying the subject that the subject has left the bed when it is determined that the fifth determination formula is satisfied in the determination result of the tenth determining unit;
Maximum and minimum total load value calculation means for calculating a maximum total load value Amax and a minimum total load value Amin within a predetermined time of the total load value A calculated by the total load value calculation means;
Amax−Amin ≧ B × q (11)
However, 0 <q (q: a preset value)
Eleventh determination means for determining whether or not the eleventh determination formula (11) is satisfied;
Third informing means for informing information related to body movement of the subject when it is determined that the eleventh judging expression is satisfied in the judgment result of the eleventh judging means;
When it is determined in the determination result of the occupancy determining means that the subject is present on the bed, the load value W1 output from the first load detecting means and the load output from the second load detecting means A head-side load value calculating means for calculating a head-side load value C obtained by summing the values W2;
Head-side load value storage means for storing the head-side load value C calculated by the head-side load value calculation means;
A head-side load value decrease amount calculating means for calculating a decrease amount ΔC within a predetermined time of the head-side load value C calculated by the head-side load value calculating means;
ΔC ≧ A × s (12)
However, 0 <s (s: preset value)
Twelfth determination means for determining whether or not the twelfth determination formula (12) is satisfied;
Fourth informing means for informing information that the subject has raised his / her body when it is determined in the determination result of the twelfth determining means that the twelfth determination formula is satisfied;
15. The bed occupancy status detection device according to any one of items 12 to 14 above.

[22] First communication means for transmitting information relating to the presence of the subject when the determination result of the at least one determination means among the first to eighth determination means determines that the determination formula is satisfied. When,
A second communication unit that transmits information indicating that the subject has left the bed when it is determined that the tenth determination formula is satisfied in the determination result of the tenth determination unit;
A third communication means for transmitting information on the body movement of the subject when it is determined that the eleventh determination formula is satisfied in the determination result of the eleventh determination means;
A fourth communication means for transmitting information indicating that the subject has raised his / her body when it is determined that the twelfth determination formula is satisfied in the determination result of the twelfth determination means;
The bed occupancy status detection device according to the preceding item 21 comprising:

[23] First to fourth load detecting means for detecting 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,
When the load values output from the first to fourth load detecting means are W1, W2, W3 and W4, respectively.
W1 / W3 ≦ n1 (1)
However, 0 <n1 <1 (n1: preset value)
First determination means for determining whether or not the first determination formula (1) is satisfied;
W3 / W1 ≦ n2 (2)
However, 0 <n2 <1 (n2: preset value)
Second determination means for determining whether or not the second determination formula (2) is satisfied;
W2 / W4 ≦ n3 (3)
However, 0 <n3 <1 (n3: preset value)
Third determination means for determining whether or not the third determination formula (3) is satisfied;
W4 / W2 ≦ n4 Formula (4)
However, 0 <n4 <1 (n4: preset value)
Fourth determination means for determining whether or not the fourth determination formula (4) is satisfied;
W1 / W2 ≦ n5 (5)
However, 0 <n5 <1 (n5: preset value)
Fifth determination means for determining whether or not the fifth determination formula (5) is satisfied;
W2 / W1 ≦ n6 Formula (6)
However, 0 <n6 <1 (n6: preset value)
Sixth determination means for determining whether or not the sixth determination formula (6) is satisfied;
W3 / W4 ≦ n7 (7)
However, 0 <n7 <1 (n7: preset value)
Seventh determination means for determining whether or not the seventh determination formula (7) is satisfied;
W4 / W3 ≦ n8 (8)
However, 0 <n8 <1 (n8: preset value)
Eighth determination means for determining whether or not the eighth determination formula (8) is satisfied;
When it is determined that the determination result of at least one determination means among the first to eighth determination means satisfies the determination formula, notification means for notifying information on the subject's occupancy status;
A bed occupancy status monitoring system characterized by comprising:

  The present invention has the following effects.

  In the invention of [1], since the first to eighth determination steps are provided, values corresponding to various sleeping postures of the subject can be detected.

  Furthermore, since the judgment formulas of the respective judgment steps do not include the length dimension and the width dimension of the bed bed portion, they do not depend on the length dimension and width dimension of the bed bed portion, that is, depending on the size of the bed bed portion. The determination can be made without. Therefore, for example, when detecting the presence state of the subject, it is not necessary to set in advance dimensions relating to the size (that is, the length and width) of the bed sleeping portion. Accordingly, it is possible to easily detect the presence of the subject on the bed of various sizes.

  Furthermore, since the 1st alerting | reporting process is provided, the information regarding a subject's occupancy status can be alert | reported with respect to a nurse, a caregiver, a supervisor, etc. as an alerting | reporting person.

  In the invention of [2], it is possible to transmit information related to the subject's bed situation.

  In the invention of [3], it is possible to notify or transmit information indicating that the subject's occupying position is the end region of the bed sleeping portion.

  In the invention of [4], since the ninth determination step and the tenth determination step are provided, it is possible to determine whether or not the subject has left the floor as information on the subject's presence status.

  Furthermore, since the 2nd alerting | reporting process is provided, the information to the effect that the test subject left bed can be alert | reported with respect to a nurse, a caregiver, a supervisor, etc.

  In the invention of [5], information indicating that the subject has left bed can be transmitted.

  In the invention of [6], since the eleventh determination step is provided, it is possible to determine whether or not there is a body movement of the subject as information on the subject's presence status.

  Furthermore, since the detection method includes the third notification step, information on the body movement of the subject can be notified to a nurse, a caregiver, a monitor, and the like.

  In the invention of [7], information related to the body movement of the subject can be transmitted.

  In the invention of [8], since the twelfth determination step is provided, it is possible to determine whether or not the subject has raised his / her upper body as information regarding the subject's presence status.

  Furthermore, since the 4th alerting | reporting process is provided, the information to the effect that the test subject raised the upper body can be alert | reported with respect to a nurse, a caregiver, a supervisor, etc.

  In the invention of [9], information indicating that the subject has raised his / her upper body can be transmitted.

  The invention [10] produces the effects of the inventions [1], [4], [6] and [8].

  The invention [11] has the effects of the inventions [2], [5], [7] and [9].

  In the inventions of [12] to [22], a bed occupancy status detection apparatus suitably used in the bed occupancy status detection method according to the inventions of [1] to [11] can be provided.

  In the invention of [23], it is possible to reliably monitor the presence of the subject.

It is the schematic of the bed presence condition detection apparatus which concerns on one Embodiment of this invention. It is a schematic plan view of the bed part of a bed. It is a block diagram which shows the structure of the same detection apparatus. It is a flowchart of the presence status detection method using the same detection apparatus. FIG. 5 is a flowchart continued from FIG. 4. FIG. 5 is a flowchart continued from FIG. 4. FIG. 5 is a flowchart continued from FIG. 4. FIG. 5 is a flowchart continued from FIG. 4. It is a top view of the bed bed part which shows the coordinate of a bed bed part. It is a top view of the bed bed part which shows the subject's sleeping figure in the example 1 of verification. It is a top view of the bed bed part which shows the test subject's sleeping figure in the verification example 2. FIG. It is a top view of the bed bed part which shows the test subject's sleeping figure in the example 3 of a verification.

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

  In FIG. 1, (20) is a bed occupancy status detection apparatus according to an embodiment of the present invention, and (60) is a bed.

  The bed (60) is used in medical facilities (eg, hospitals), elderly facilities, nursing homes, nursing homes, general homes, and the like. The bed (61) of the bed (60) is formed in a rectangular shape in plan view as shown in FIG. As shown in FIG. 1, the bed (60) is installed on a bed installation surface (64) comprising a floor surface in a hospital room, examination room, examination room, bedroom or the like.

  Here, in this specification, for convenience of explanation, as shown in FIGS. 1 and 2, in the state where the subject (H) goes to bed in the supine posture (that is, the supine posture) on the bed bed portion (61), the subject (H ) The head side of the bed bed (61), the foot side of the subject (H) is the foot side of the bed bed (61), and the right side of the subject (H) is the bed bed (61 ) ”And the left side of the subject (H) are referred to as“ the left side of the bed bed portion (61) ”.

  As shown in FIG. 1, the bed (60) has four legs for supporting the bed (61) at a predetermined height in a substantially horizontal manner, that is, the head-side right leg (62a) and the head-side left. It has a leg part (62b), a foot side right leg part (62c), and a leg side left leg part (62d). Furthermore, a rotatable bed moving caster (63) is provided at the lower end of each leg (62a) (62b) (62c) (62d). In the present invention, the caster (63) is not necessarily provided at the lower end of each leg (62a) (62b) (62c) (62d).

  On this bed sleeping part (61), as subjects (H), for example, sick people, dementia patients, elderly people, healthy people, infants, etc. can be in various postures for sleep, rest, medical treatment, examination, examination, etc. Stay in bed (eg: supine posture, lateral posture, prone posture).

  In the present invention, the bed (60) is not limited to being a sleeping or resting bed, but may be, for example, an examination table, an examination table, a stretcher, a sofa, or the like. .

  The bed occupancy status detection device (20) of the present embodiment has a value corresponding to a sleeping state, a bed, a bed (entrance), as the occupancy status of the subject (H) on the bed cot (61), The presence / absence of body movement and whether or not the subject (H) has raised his / her upper body are detected.

  As shown in FIGS. 1 and 3, the detection device (20) includes first to fourth load detection means (21a) (21b) (21c) (21d), a control device (22), and a first communication. The apparatus (23), the arithmetic unit (30), the 2nd communication apparatus (40), and the alerting | reporting apparatus (50) are provided.

  The first load detecting means (21a) continuously detects the load applied to the right side of the bed (61) (in detail, the right end of the head side) in time (ie, every predetermined time). is there. The first load detecting means (21a) is interposed between the caster (63) of the head-side right leg (62a) of the bed (60) and the bed installation surface (64).

  The second load detection means (21b) detects the load applied to the head side left part (specifically, the head side left end part) of the bed bed part (61) continuously in time. The second load detection means (21b) is interposed between the caster (63) of the head-side left leg (62b) of the bed (60) and the bed installation surface (64).

  The third load detecting means (21c) detects the load applied to the right side of the bed (61) (in detail, the right end of the foot side) continuously in time. The third load detection means (21c) is disposed between the caster (63) of the foot-side right leg (62c) and the bed installation surface (64) of the bed (60).

  The fourth load detection means (21d) detects the load applied to the left side of the bed (61) (in detail, the left end of the foot side) continuously in time. The fourth load detection means (21d) is disposed between the caster (63) of the foot side left leg (62d) of the bed (60) and the bed installation surface (64).

  Each load detection means (21a) (21b) (21c) (21d) consists of a commercially available load detector, for example, a load cell having a strain gauge.

  The number of load detections per second by each of the load detection means (21a) (21b) (21c) (21d) is preferably set to 2 times / second or more, particularly 4 times / second or more and 100 times / second. It is desirable to set as follows. However, in the present invention, the number of load detections per second by each load detection means (21a) (21b) (21c) (21d) is not limited to being within the above range.

  In this embodiment, each load detection means (21a) (21b) (21c) (21d) outputs a voltage corresponding to the magnitude of the load applied to each part of the bed bed (61) as a load value. The

  As shown in FIG. 3, the control device (22) has an amplification means (22a) and an analog-digital conversion means (A / D conversion means) (22b). This control device (22) is attached to any one load detection means (21b) among the first to fourth load detection means (21a) (21b) (21c) (21d), for example.

  The amplification means (22a) amplifies the voltage as the load value output from each load detection means (21a) (21b) (21c) (21d). The analog-digital conversion means (22b) converts the voltage amplified by the amplification means (22a) from an analog signal to a digital signal.

  The first communication device (23) transmits the voltage (digital signal) converted by the analog-digital conversion means (22b) via a wired communication network such as a telephone line network, the Internet, a wired LAN, or a wireless LAN, or a wireless communication network. To the arithmetic unit (30). In the present embodiment, the first communication device (23) is configured to transmit to the arithmetic device (30) via a wireless communication network. In FIG. 1, (30a) is a receiving antenna unit of the arithmetic unit (30) that receives a signal transmitted from the first communication device (23).

  The calculation device (30) includes a calculation unit (31), a storage unit (32), and a determination unit (33). The arithmetic unit (30) is constituted by a computer having a ROM, a RAM, other memory, a CPU, and the like. This computing device (30) is installed, for example, in a room in which a bed (60) is installed, installed in a monitoring room, a nurse station, a caregiver's station, etc., or includes a mobile phone (including PHS). )).

  The calculation unit (31) includes a load value calculation means (31a), a total load value calculation means (31c), a maximum and minimum load value calculation means (31d), a head side load value calculation means (31e), Side load value decrease amount calculation means (31f).

  The storage unit (32) includes a total load value storage means (32a), a bed load value storage means (32b), a head load value storage means (32c), and a set value storage means (32d). ing. Furthermore, the storage unit (32) includes a storage unit (not shown) that stores a program necessary for detecting the presence of the subject (H) and a predetermined determination formula.

  The determination unit (33) includes first to twelfth determination means (33a) (33b) (33c) (33d) (33e) (33f) (33g) (33h) (33i) (33j) (33k) (331). And occupancy determination means (33h).

  The load value calculation means (31a) is a load applied to each part of the bed bed (61) based on the voltage (digital signal) output from each load detection means (21a) (21b) (21c) (21d). Is calculated continuously as a load value output from each load detecting means (21a) (21b) (21c) (21d). Further, the load value calculating means (31a) subtracts the load of the bed (61) in a state where the subject (H) is not present on the bed bed (61), that is, the load of only the bed (61). It is configured to be able to perform a tare process.

  Here, the load values output from the first to fourth load detection means (21a) (21b) (21c) (21d) are respectively W1 to W4, and the first to fourth load detection means (21a) (21b). (21c) Let the voltages output from (21d) be V1 to V4, respectively. At this time, W1, W2, W3, and W4 are calculated by the following equations (i) to (iv), respectively.

W1 = a1 × V1 + b1 Formula (i)
W2 = a2 × V2 + b2 Formula (ii)
W3 = a3 × V3 + b3 Formula (iii)
W4 = a4 × V4 + b4 Formula (iv)

However,
W1: Load value output from the first load detection means (21a) W2: Load value output from the second load detection means (21b) W3: Load value output from the third load detection means (21c) W4: Load value output from the fourth load detection means (21d) V1: Voltage output from the first load detection means (21a) V2: Voltage output from the second load detection means (21b) V3: Third load detection Voltage output from the means (21c) V4: Voltage output from the fourth load detection means (21d)

  Further, a1, a2, a3, and a4 are all preset constants, and a1 ≠ 0, a2 ≠ 0, a3 ≠ 0, and a4 ≠ 0. Also, b1, b2, b3, and b4 are all preset constants.

  W1 to W4 are values obtained by subtracting the load of only the bed (51), that is, values after taring. However, in the present invention, W1 to W4 may each be a value before the tare process, that is, a value including the load of the bed (60) as a tare.

  W1 corresponds to the load after the tare process applied to the right side on the head side of the bed bed portion (61). W2 corresponds to the load after the tare process applied to the head side left portion of the bed bed portion (61). W3 corresponds to the load after the tare process applied to the right side of the foot side of the bed bed (61). W4 corresponds to the load after the tare process applied to the left side of the bed bed portion (61).

  However, in the present invention, as the load value output from the first to fourth load detection means (21a) (21b) (21c) (21d), for example, the first to fourth load detection means (21a), for example, respectively. (21b) The voltages V1, V2, V3, and V4 output from the tare process or before the tare process output from (21d) may be used. In this case, the relationships of the above formulas (i) to (iv) are established between V1, V2, V3, and V4 and W1, W2, W3, and W4, respectively.

  The number of calculations per second by the load value calculation means (31a) is set to be the same as the number of loads detected per second by the load detection means (21a) (21b) (21c) (21d), for example.

  The total load value calculation means (31c) temporally calculates the total load value A obtained by adding the four load values output from the first to fourth load detection means (21a) (21b) (21c) (21d). It calculates continuously. That is, the total load value A is calculated by the following equation (v).

  A = W1 + W2 + W3 + W4 Formula (v)

  The number of calculations per second by the total load value calculation means (31c) is set to be the same as the number of loads detected per second by each load detection means (21a) (21b) (21c) (21d), for example. The

  The total load value storage means (32a) stores the total load value A calculated by the total load value calculation means (31c) continuously in time.

  The number of times of storage per second by the total load value storage means (32a) is set to be the same as the number of calculations per second by the total load value calculation means (31c), for example.

  Depending on whether or not the total load value A calculated by the total load value calculation means (31c) is equal to or greater than the predetermined load value for a predetermined time, the occupancy determination means (33m) It is determined whether or not the user is on the bed sleeping portion (61). More specifically, this occupancy determination means (33m) determines that the subject (H) is present on the bed berth (61) when the total load value A is equal to or greater than the predetermined load value for a predetermined time. On the other hand, if this is not the case, it is determined that the subject (H) is not present on the bed sleeping portion (61).

  In the presence determination means (33m), for example, a range of 5 to 300 seconds is used as the predetermined time. Moreover, as a predetermined load value or more, for example, 1/2 or more, preferably 3/4 or more of the weight of the subject (H) is used. Note that the upper limit of the predetermined load value is not limited, and the predetermined load value is set to be equal to or less than the weight of the subject (H), for example. However, in the present invention, the predetermined time and the predetermined load value are not limited to being within the above-mentioned range, but the subject's (H) body condition, weight, height, or the facility where the detection device (20) is used. Various settings can be changed accordingly.

  Note that 1 kgf = 9.80665 N, and approximately 1 kgf = 9.8 N.

  When the occupancy load value storage means (32b) determines that the subject (H) is present on the bed-bed part (61) in the determination result of the occupancy determination means (33m), the occupancy load determination means (33m) ) Is stored as a load value in a state where the subject (H) is on the bed (61), that is, the bed load value B.

  The head-side load value calculating means (31e), when it is determined that the subject (H) is present on the bed sleeping portion (61) in the determination result of the presence determination means (33m), the first load detection means ( 21. The load value W1 output from 21a) and the load value W2 output from the second load detection means (21b) are summed up in time as the head-side load value C. is there. That is, the head side load value C is calculated by the following equation (vi).

  C = W1 + W2 Formula (vi)

  The number of calculations per second by the head-side load value calculating means (31e) is set to be the same as the number of calculations per second by the load value calculating means (31a), for example.

  The head-side load value storage means (32c) stores the head-side load value C calculated by the head-side load value calculation means (31e) continuously in time.

  Note that the number of times of storage per second by the head-side load value storage means (32c) is set to be the same as the number of times of calculation per second by the head-side load value calculation means (31e), for example.

  The head-side load value decrease amount calculating means (31f) continuously calculates a decrease amount ΔC within a predetermined time of the head-side load value C calculated by the head-side load value calculating means (31e). is there. As the predetermined time, for example, a range of 3 to 180 seconds is used. However, in the present invention, the predetermined time is not limited to being within the above-mentioned range, and may vary depending on the physical condition, weight, height, etc. of the subject (H) and the facility where the detection device (20) is used. Settings can be changed.

When the current head-side load value C is C _(t0) and the head-side load value C T seconds before the present is C _(t0-T) , ΔC is calculated by the following equation (vii).

ΔC = C _(t0−T) −C _(t0) Equation (vii)

  Note that the number of calculations per second by the head-side load value decrease amount calculating means (31f) is set to be the same as the number of calculations per second by the head-side load value calculating means (31e), for example.

  The maximum and minimum load value calculating means (31d) continuously continues the maximum total load value Amax and the minimum total load value Amin within a predetermined time of the total load value A calculated by the total load value calculating means (31c). To calculate. As the predetermined time, for example, a range of 3 to 180 seconds is used. However, in the present invention, the predetermined time is not limited to being within the above-mentioned range, and may vary depending on the physical condition, weight, height, etc. of the subject (H) and the facility where the detection device (20) is used. Settings can be changed.

  The number of calculations per second by the maximum and minimum load value calculating means (31d) is set to be the same as the number of calculations per second by the load value calculating means (31a), for example.

  Based on the load value W1 output from the first load detection means (21a) and the load value W3 output from the third load detection means (21c), the first determination means (33a) It is determined whether or not the determination formula (1) is satisfied.

  W1 / W3 ≦ n1 (1)

  However, n1 is a preset value (first threshold), and 0 <n1 <1. More specifically, for example, 0 <n1 <0.35.

  Based on the load value W1 output from the first load detection means (21a) and the load value W3 output from the third load detection means (21c), the second determination means (33b) It is determined whether or not the determination formula (2) is satisfied.

  W3 / W1 ≦ n2 (2)

  However, n2 is a preset value (second threshold), and 0 <n2 <1. More specifically, for example, 0 <n2 <0.35.

  Based on the load value W2 output from the second load detection means (21b) and the load value W4 output from the fourth load detection means (21d), the third determination means (33c) It is determined whether or not the determination formula (3) is satisfied.

  W2 / W4 ≦ n3 (3)

  However, n3 is a preset value (third threshold value), and 0 <n3 <1. More specifically, for example, 0 <n3 <0.35.

  Based on the load value W2 output from the second load detection means (21b) and the load value W4 output from the fourth load detection means (21d), the fourth determination means (33d) It is determined whether or not the determination formula (4) is satisfied.

  W4 / W2 ≦ n4 Formula (4)

  However, n4 is a preset value (fourth threshold value), and 0 <n4 <1. More specifically, for example, 0 <n4 <0.35.

  Based on the load value W1 output from the first load detection means (21a) and the load value W2 output from the second load detection means (21b), the fifth determination means (33e) It is determined whether or not the determination formula (5) is satisfied.

  W1 / W2 ≦ n5 (5)

  However, n5 is a preset value (fifth threshold value), and 0 <n5 <1. More specifically, for example, 0 <n5 <0.35.

  Based on the load value W1 output from the first load detection means (21a) and the load value W2 output from the second load detection means (21b), the sixth determination means (33f) It is determined whether or not the determination formula (6) is satisfied.

  W2 / W1 ≦ n6 Formula (6)

  However, n6 is a preset value (sixth threshold value), and 0 <n6 <1. More specifically, for example, 0 <n6 <0.35.

  Based on the load value W3 output from the third load detection means (21c) and the load value W4 output from the fourth load detection means (21d), the seventh determination means (33g) It is determined whether or not the determination formula (7) is satisfied.

  W3 / W4 ≦ n7 (7)

  However, n7 is a preset value (seventh threshold value), and 0 <n7 <1. More specifically, for example, 0 <n7 <0.35.

  Based on the load value W3 output from the third load detection means (21c) and the load value W4 output from the fourth load detection means (21d), the eighth determination means (33h) It is determined whether or not the determination formula (8) is satisfied.

  W4 / W3 ≦ n8 (8)

  However, n8 is a preset value (eighth threshold), and 0 <n8 <1. More specifically, for example, 0 <n8 <0.35.

  In the present invention, n1, n2, n3, n4, n5, n6, n7, and n8 are not limited to the above ranges, and the physical condition, weight, height, etc. of the subject (H) Various settings can be changed according to the size of the bed (61) and the facility where the detection device (20) is used.

  The ninth determination means (33i) is based on the total load value A calculated by the total load value calculation means (31c) and the bed load value B stored in the bed load value storage means (32b). It is determined whether or not the following ninth determination formula (9) is satisfied.

  A ≦ B × m1 Formula (9)

  However, m1 is a preset value and 0 <m1 <1. More specifically, for example, 0.5 <m1 <0.9.

  The tenth determining means (33j) is based on the total load value A calculated by the total load value calculating means (31c) and the bed load value B stored in the bed load value storage means (32b). It is determined whether or not the following tenth determination formula (10) is satisfied.

  A <B × m2 Formula (10)

  However, m2 is a preset value and 0 <m2 <m1. More specifically, for example, 0 <m2 ≦ 0.5.

  In the present invention, m1 and m2 are not limited to being within the above-mentioned range, and the physical condition, weight, height, the size of the bed bed (61), the detection device, etc. of the subject (H) Various settings can be changed according to the facility used in (20).

  The eleventh determination means (33k) includes the maximum load value Amax and the minimum load value Amin calculated by the maximum and minimum load value calculation means (31d), and the bed load stored in the bed load value storage means (32b). Based on the value B, it is determined whether or not the following eleventh determination formula (11) is satisfied.

  Amax−Amin ≧ B × q (11)

  However, q is a preset value and 0 <q. More specifically, for example, 0.05 <q <0.2.

  In the present invention, q is not limited to be within the above range, and the physical condition, weight, height of the subject (H), the size of the bed bed (61), the detection device (20 ) Can be changed in various ways according to the facility used.

  The twelfth determination means (331) includes the total load value A calculated by the total load value calculation means (31c) and the decrease amount ΔC of the head load value calculated by the head load value decrease calculation means (31f). Based on the above, it is determined whether or not the following twelfth determination formula (12) is satisfied.

  ΔC ≧ A × s (12)

  However, s is a preset value and 0 <s. More specifically, for example, 0.05 <s <0.2.

  In the present invention, s is not limited to be within the above range, and the physical condition, weight, height of the subject (H), the size of the bed bed (61), the detection device (20 ) Can be changed in various ways according to the facility used.

  Further, the number of determinations per second by each determination unit (33a to 33l) is set to be the same as the number of calculations per second by the load value calculation unit (31a), for example.

  The set value storage means (32d) sets and stores predetermined values such as n1 to n8, m1, m2, q, s, a1 to a4, and b1 to b4 in advance. Further, the arithmetic unit (30) has an input means for inputting a predetermined value in order to store the predetermined value in the set value storage means (32d).

  The notification device (50) includes first to fourth notification means (50a) (50b) (50c) (50d). This notification device (50) is, for example, installed in a monitoring room, a nurse station, a caregiver's stuffing station, etc., or mounted on a mobile phone (including PHS).

  The first notification means (50a) is a determination result of at least one of the first to eighth determination means (33a) (33b) (33c) (33d) (33e) (33f) (33g) (33h). When it is determined that the determination formula is satisfied, information regarding the presence status of the subject (H) is notified to a nurse, a caregiver, a supervisor, or the like as a notification target person. In the present embodiment, the first notification means (50a) indicates that the bed position of the subject (H) is the end area of the bed bed portion (61) as information related to the bed state of the subject (H). Broadcast information.

  In addition, as an edge part area | region of a bed bed part (61), there exist a right edge part area | region, a left edge part area | region, a head side edge part area | region, and a leg side edge part area | region of a bed bed part (61), for example. Moreover, the right end part area | region of a bed bed part (61) is set to the width area of 100-250 mm from the right edge of a bed bed part (61), for example, The left end part area | region of a bed bed part (61) is, for example, It is set to a width region of 100 to 250 mm from the left edge of the bed bed portion (61). Moreover, the head side edge part area | region of a bed bed part (61) is set to the width area of 100-500 mm from the head side edge of a bed bed part (61), for example, and the foot side edge of a bed bed part (61) The partial region is set to a width region of 100 to 500 mm from the foot side edge of the bed bed (61), for example. However, in the present invention, the end region of the bed bed portion (61) is not limited to the above-described region, but the subject's (H) body condition, weight, height, the bed bed portion (61) Various settings can be changed depending on the size and the facility where the detection device (20) is used.

  When it is determined that the second determination means (50b) satisfies the tenth determination formula (10) in the determination result of the tenth determination means (33j), the information indicating that the subject (H) has left the bed, As a notification target person, notification is given to a monitor, a nurse, a caregiver, and the like.

  A 3rd alerting | reporting means (50c) alert | reports the information regarding a subject's (H) body movement, when it determines with satisfy | filling the 11th determination formula (11) in the determination result of the 11th determination means (33k). The target person is notified to nurses, caregivers, supervisors and the like. In this embodiment, a 3rd alerting | reporting means (50c) alert | reports the information to the effect of a test subject's (H) body motion as information regarding a test subject's (H) body motion.

  The fourth notification means (50d) indicates that the subject (H) has raised his / her body when it is determined that the determination result of the twelfth determination means (331) satisfies the twelfth determination formula (12). Information is notified to a nurse, a caregiver, a supervisor, etc. as a notification target person.

  Each of the notification means (50a) (50b) (50c) (50d) 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 is constituted by a liquid crystal display, a CRT, or the like, and notifies predetermined information to a notification target person by displaying characters, figures, and the like.

  The second communication device (40) includes first to fourth communication means (40a) (40b) (40c) (40d). The second communication device (40) is attached to the arithmetic device (30), for example.

  The first communication unit (40a) is configured to determine at least one of the first to eighth determination units (33a) (33b) (33c) (33d) (33e) (33f) (33g) (33h). If it is determined that the determination formula is satisfied in the result, information on the subject's (H) occupancy status is obtained via a wireless communication network such as a telephone line network, the Internet, a wired LAN, a wireless LAN, or a wired communication network. It transmits to a 1st alerting | reporting means (50a). In this embodiment, the 1st communication means (40a) is information that the subject's (H) occupancy position is the end region of the bed sleeping portion (61) as information on the occupancy status of the subject (H). Send.

  When the second communication means (40b) determines that the tenth determination formula (10) is satisfied in the determination result of the tenth determination means (33j), the information indicating that the subject (H) has left the floor is obtained. It transmits to a 2nd alerting | reporting means (50b) via a wireless communication network or a wired communication network.

  If the third communication means (40c) determines that the eleventh determination formula (11) is satisfied in the determination result of the eleventh determination means (33k), the third communication means (40c) wirelessly transmits information on the body movement of the subject (H). It transmits to a 3rd alerting | reporting means (50c) via a communication network or a wired communication network. In this embodiment, a 3rd communication means (40c) transmits the information to the effect of a test subject's (H) body motion as information regarding a test subject's (H) body motion.

  When it is determined that the fourth communication means (40d) satisfies the twelfth determination formula (12) in the determination result of the twelfth determination means (331), the subject (H) has raised his / her upper body. The information is transmitted to the fourth notification means (50d) via a wireless communication network or a wired communication network.

  In each communication means (40a), (40b), (40c) and (40d), as a telephone line network, a mobile telephone (including PHS) line network, a fixed telephone line network, or the like is used.

  Next, a bed occupancy state detection method using the detection device (20) will be described below based on the flowcharts shown in FIGS.

  As shown in FIG. 4, in step S <b> 1, first to fourth load detections are respectively 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 (61). Detecting by means (21a) (21b) (21c) (21d) [load detection step]. At this time, the load values output from the first to fourth load detection means (21a) (21b) (21c) (21d) are tared. Thereby, as a load value applied to each part of the bed bed portion (61) when the subject (H) is not present on the bed bed portion (61), the first to fourth load detection means (21a) ( 21b) Load values W1, W2, W3, and W4 output from (21c) and (21d) are all set to 0 kgf.

  In step S1, a voltage corresponding to the magnitude of the load applied to each part of the bed bed (61) is output from each load detection means (21a) (21b) (21c) (21d). This voltage is then transmitted to the control device (22). The transmitted voltage is amplified by the amplifying means (22a) of the control device (22), then converted from an analog signal to a digital signal by the analog-digital converting means (22b), and then converted by the first communication device (23). It is transmitted to the computing means (30) via the wireless communication network (or wired communication network). Based on the transmitted voltage, load values W1, W2, W3, and W4 applied to each part of the bed bed portion (61) are calculated by the load value calculation means (31a) of the calculation means (30). In addition, the relationship of said Formula (i)-(iv) is materialized between a voltage and a load value. Next, the process proceeds to step S2.

  In step S2, the total load value A obtained by totaling the four load values W1, W2, W3 and W4 output from the first to fourth load detection means (21a) (21b) (21c) (21d), The total load value calculation means (31c) continuously calculates in time (that is, every predetermined time) [total load value calculation step]. The total load value A is calculated by the above formula (v). And it is determined by the predetermined determination means (not shown) with which the determination part (33) of the arithmetic unit (30) was provided whether the total load value A is 20 kgf or more as a predetermined load value, for example. If it is determined that the total load value A is 20 kgf or more (that is, A ≧ 20 kgf) (in the case of “YES”), the process proceeds to step S3. On the other hand, when it is determined that the total load value A is less than 20 kgf (that is, A <20 kgf) (in the case of “NO”), the process returns to step S2.

  In the present invention, the predetermined load value in step S2 is not limited to 20 kgf. As the predetermined load value or more, for example, 1/2 or more, preferably 3/4 or more of the weight of the subject (H) is used. Note that the upper limit of the predetermined load value is not limited, and the predetermined load value is set to be equal to or less than the weight of the subject (H), for example. However, in the present invention, the predetermined load value is not limited to being within the above range, and can be variously changed according to, for example, the body condition, weight, etc. of the subject (H).

  In step S3, it starts to store the total load value A in the total load value storage means (32a) continuously in time [total load value storage step]. Next, the process proceeds to step S4.

  In step S4, it is determined by the presence determination means (33m) whether or not the total load value A is equal to or greater than the predetermined load value for a predetermined time [in-situ determination step]. In the present embodiment, for example, 30 seconds is used as the predetermined time, and 20 kgf is used as the predetermined load value. If it is determined that the total load value A is equal to or greater than the predetermined load value (ie, 20 kgf) for a predetermined time (ie, 30 seconds) (“YES”), the process proceeds to step S5. On the other hand, if it is determined that this is not the case ("NO"), the process returns to step S4. In the present invention, the predetermined time is not limited to 30 seconds. For example, the setting can be changed variously according to the physical condition, weight, etc. of the subject (H), and the predetermined load value is 20 kgf. For example, the setting can be changed variously according to the physical condition, weight, etc. of the subject (H).

  In step S5, the total load value A at the elapse of a predetermined time (ie, 30 seconds) in the presence determination process in step S4 is the load value in a state where the subject (H) is present on the bed sleeping portion (61), That is, it is stored in the bed load value storage means (32b) as the bed load value B [bed load value storage step]. In the present embodiment, the total load value A after 30 seconds is stored as the bed load value B. Next, the process proceeds to step S6.

  In step S6, it is determined that the subject (H) is present on the bed sleeping portion (61). Next, the process proceeds to step S7.

  In step S7, the load value W1 output from the first load detection means (21a) and the load value W2 output from the second load detection means (21b) are summed as a head load value C. The head side load value calculation means (31e) calculates continuously in time [head side load value calculation step]. The head side load value C is calculated by the above formula (vi). Then, the head-side load value C calculated by the head-side load value calculation means (31e) is started to be stored in the head-side load value storage means (32c) continuously in time [head-side load value storage. Process]. Subsequently, it progresses to step S11, S31, S41, and S51, respectively.

  As shown in FIG. 5, in step S11, it is determined by the first determination means (33a) whether or not the first determination formula (1) is satisfied [first determination step]. In this determination result, if it is determined that the first determination formula (1) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the first determination formula (1) is not satisfied (in the case of “NO”), the process proceeds to step S11.

  In step S12, it is determined by the second determination means (33b) whether or not the second determination formula (2) is satisfied [second determination step]. In this determination result, if it is determined that the second determination formula (2) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the second determination formula (2) is not satisfied (in the case of “NO”), the process proceeds to step S13.

  In step S13, it is determined by the third determination means (33c) whether or not the third determination formula (3) is satisfied [third determination step]. In this determination result, if it is determined that the third determination formula (3) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the third determination formula (3) is not satisfied (in the case of “NO”), the process proceeds to step S14.

  In step S14, it is determined by the fourth determination means (33d) whether or not the fourth determination formula (4) is satisfied [fourth determination step]. In this determination result, if it is determined that the fourth determination formula (4) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the fourth determination formula (4) is not satisfied (in the case of “NO”), the process proceeds to step S15.

  In step S15, it is determined by the fifth determination means (33e) whether or not the fifth determination formula (5) is satisfied [fifth determination step]. In this determination result, if it is determined that the fifth determination formula (5) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the fifth determination formula (5) is not satisfied (in the case of “NO”), the process proceeds to step S16.

  In step S16, it is determined by the sixth determination means (33f) whether or not the sixth determination formula (6) is satisfied [sixth determination step]. In this determination result, if it is determined that the sixth determination formula (6) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the sixth determination formula (6) is not satisfied (in the case of “NO”), the process proceeds to step S17.

  In step S17, it is determined by the seventh determination means (33g) whether or not the seventh determination formula (7) is satisfied [seventh determination step]. In this determination result, if it is determined that the seventh determination formula (7) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the seventh determination formula (7) is not satisfied (in the case of “NO”), the process proceeds to step S18.

  In step S18, it is determined by the eighth determination means (33h) whether or not the eighth determination formula (8) is satisfied [eighth determination step]. If it is determined in this determination result that the eighth determination formula (8) is satisfied (in the case of “YES”), the process proceeds to step S19. On the other hand, if it is determined that the eighth determination formula (8) is not satisfied (in the case of “NO”), the process returns to step S11.

  In step S19, it is determined that the occupancy position of the subject (H) is in the end region of the bed sleeping portion (61) as information on the occupancy status of the subject (H). Next, the process proceeds to step S20.

  In step S20, the information indicating that the subject's (H) occupancy position is the end region of the bed sleeping portion (61) is obtained by the first communication means (40a) as information regarding the subject's (H) occupancy status. It transmits to a 1st alerting | reporting means (50a) via a wireless communication network or a wired communication network [1st communication process]. Next, the process proceeds to step S21.

  In step S21, information indicating that the subject's (H) occupancy position is in the end region of the bed sleeping portion (61) is provided by the first notification means (50a) as information relating to the subject's (H) occupancy status. Informing the nurse, caregiver, supervisor, etc. [first notification step]. Thereby, the nurse or the like can know the information that the subject (H) is in the bed area in the end region of the bed sleeping portion (61). A nurse or the like who knows this information can take necessary measures for the subject (H), for example. The treatment to be performed on the subject (H) includes, for example, a fall prevention treatment from the bed (61) of the subject (H) or the care (help) of the subject (H) trying to get out of bed.

  As shown in FIG. 6, in step S31, it is determined by the ninth determination means (33i) whether or not the ninth determination formula (9) is satisfied [9th determination step]. In this determination result, if it is determined that the ninth determination formula (9) is satisfied (in the case of “YES”), the process proceeds to step S32. On the other hand, if it is determined that the ninth determination formula (9) is not satisfied (in the case of “NO”), the process returns to step S31.

  In step S32, it is determined by the tenth determination means (33j) whether or not the tenth determination formula (10) is satisfied [tenth determination step]. In this determination result, if it is determined that the tenth determination formula (10) is satisfied (in the case of “YES”), the process proceeds to step S33. On the other hand, if it is determined that the tenth determination formula (10) is not satisfied (in the case of “NO”), the process proceeds to step S34.

  In step S33, it is determined that the subject (H) has left the bed. Next, the process proceeds to step S35.

  In step S34, it is determined that the total load value A (total load) has decreased. In step S34, for example, it is determined that the posture of the subject (H) is in the end sitting position or other postures.

  In step S35, information indicating that the subject (H) has left the floor or information indicating that the total load value A has decreased is transmitted to the second notification means via the wireless communication network or the wired communication network by the second communication means (40b). (2nd communication process) which transmits to (50b). Next, the process proceeds to step S36.

  In step S36, information indicating that the subject (H) has left the floor or information indicating that the total load value A has decreased is notified to a nurse, a caregiver, a monitor, or the like by the second notification means (50b). [Second notification step]. Thereby, the nurse or the like can know the information that the subject (H) has left the floor or the information that the total load value A has decreased. A nurse or the like who knows this information can take necessary measures for the subject (H). The treatment to be performed on the subject (H) includes, for example, the care (help) of the subject (H) who has left the bed.

  As shown in FIG. 7, in step S41, the maximum total load value Amax and the minimum total load value Amin within a predetermined time (for example, 3 seconds) of the total load value A calculated by the total load value calculation means (31c) The maximum and minimum total load value calculation means (31d) calculates continuously in time [maximum and minimum load value calculation step]. Next, the process proceeds to step S42.

  In step S42, it is determined by the eleventh determination means (33k) whether or not the eleventh determination formula (11) is satisfied [11th determination step]. In this determination result, if it is determined that the eleventh determination formula (11) is satisfied (in the case of “YES”), the process proceeds to step S43. On the other hand, if it is determined that the eleventh determination formula (11) is not satisfied (in the case of “NO”), the process returns to step S41.

  In step S43, it is determined that there is body movement of the subject (H). Next, the process proceeds to step S44.

  In step S44, as information related to the body movement of the subject (H), information indicating that the body movement of the subject (H) is present is notified by the third communication means (40c) via the wireless communication network or the wired communication network. Transmitting to the means (50c) [third communication step]. Next, the process proceeds to step S45.

  In step S45, information indicating that there is body movement of the subject (H) as information about the body movement of the subject (H) is notified to the nurse, caregiver, monitor, etc. by the third notification means (50c). [Third notification step].

  As shown in FIG. 8, in step S51, the amount of decrease ΔC within a predetermined time (for example, 3 seconds) of the head side load value C calculated by the head side load value calculating means (31e) is used as the head side load value decrease amount. The time is continuously calculated by the calculation means (21f) [head load value decrease amount calculation step]. Next, the process proceeds to step S52.

  In step S52, it is determined by the twelfth determination means (331) whether or not the twelfth determination formula (12) is satisfied [a twelfth determination step]. In this determination result, if it is determined that the twelfth determination formula (12) is satisfied (in the case of “YES”), the process proceeds to step S53. On the other hand, if it is determined that the twelfth determination formula (12) is not satisfied (in the case of “NO”), the process returns to step S51.

  In step S53, it is determined that the subject (H) has raised his / her upper body. Next, the process proceeds to step S54.

  In step S54, information indicating that the subject (H) has raised his / her upper body is transmitted by the fourth communication means (40d) to the fourth notification means (50d) via the wireless communication network or the wired communication network [fourth]. Communication process]. Next, the process proceeds to step S55.

  In step S55, information indicating that the subject (H) has raised his / her upper body is notified to the nurse, caregiver, supervisor, etc. by the fourth notification means (50d) [fourth notification step]. Thereby, nurses etc. can know that the subject (H) raised his upper body.

  Thus, the bed occupancy status detection method of this embodiment has the following advantages.

  Since the bed occupancy status detection method of the present embodiment includes the first to eighth determination steps, values corresponding to various sleeping postures of the subject (H) can be detected (Verification Examples 1 to 3 described later). reference).

  Furthermore, since the judgment formulas (1 to 12) of each judgment step do not include the length dimension and the width dimension of the bed bed portion (61), they do not depend on the length dimension and the width dimension of the bed bed portion (61). In other words, the determination can be made without depending on the size of the bed bed (61). Therefore, for example, when detecting the presence state of the subject (H), it is not necessary to set in advance dimensions relating to the size (that is, length, width, etc.) of the bed bed portion (61). Therefore, it is possible to easily detect the presence of the subject (H) on the bed (60) of various sizes.

  Furthermore, since this detection method includes the first notification step, it is possible to notify a nurse, a caregiver, a monitor, and the like of information related to the presence status of the subject (H).

  Furthermore, since this detection method includes the first communication step, it is possible to transmit information related to the presence status of the subject (H).

  Moreover, in this detection method, since the information regarding the bed presence state of the subject (H) is information indicating that the bed position of the subject (H) is the end region of the bed bed portion (61), the subject (H ) Can be notified or transmitted of information indicating that the bed position is the end area of the bed sleeping portion (61).

  Furthermore, since this detection method includes the ninth determination step and the tenth determination step, it can be determined whether or not the subject (H) has left the floor as information on the presence of the subject (H).

  Furthermore, since this detection method includes a second notification step, information indicating that the subject (H) has left the floor can be notified to nurses, caregivers, monitors, and the like.

  Furthermore, since this detection method includes the second communication step, information indicating that the subject (H) has left the floor can be transmitted.

  Furthermore, since this detection method includes the eleventh determination step, it is possible to determine whether or not there is any body movement of the subject (H) as information related to the presence status of the subject (H).

  Furthermore, since this detection method includes a third notification step, information regarding the body movement of the subject (H) can be notified to a nurse, a caregiver, a monitor, and the like.

  Furthermore, since this detection method includes the third communication step, it is possible to transmit information related to the body movement of the subject (H).

  Furthermore, since this detection method includes the twelfth determination step, it is possible to determine whether or not the subject (H) has raised his / her upper body as information regarding the presence of the subject (H).

  Furthermore, since this detection method includes a fourth notification step, information indicating that the subject (H) has raised his / her upper body can be notified to a nurse, a caregiver, a monitor, and the like.

  Furthermore, since this detection method includes the fourth communication step, information indicating that the subject (H) has raised his / her upper body can be transmitted.

  The bed occupancy status detection device (20) of this embodiment has the same advantages as the detection method.

  A bed occupancy status monitoring system (70) according to an embodiment of the present invention includes the detection device (20) of the present embodiment. Therefore, this monitoring system (70) can reliably monitor the presence of the subject (H).

  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 setting changes can be made.

  For example, the bed occupancy status detection device according to the present invention is capable of measuring not only the occupancy status of the subject (H) but also the biological information (eg, respiratory rate, heart rate) of the subject (H). It may be configured in combination with a device that measures the biological information of the subject (H).

  In the above embodiment, W1, W2, W3, and W4 are values after taring, but in the present invention, W1, W2, W3, and W4 are values before taring, that is, a bed (60 as a tare). ) May be included.

  Next, specific verification examples of the present invention will be shown below.

  As shown in FIG. 9, the bed (60) has a leg length BX in the length direction of the bed bed portion (61) of 2000 mm and a leg width in the width direction of the bed bed portion (61) of 800 mm. I prepared something. In addition, let the length direction of the bed bed part (61) be an X-axis direction, and let the width direction of the bed bed part (62) be a Y-axis direction. The subject (H) has a body weight of 100 kgf.

  Further, an area that is 1/4 with respect to the BY from the right edge of the bed bed portion (61) toward the center in the width direction of the bed bed portion (61) is defined as the right edge region of the bed bed portion (61). The area of 1/4 with respect to the BY from the left edge of the bed bed part (61) toward the center in the width direction of the bed bed part (61) is defined as the left end area of the bed bed part (61). Here, since BY is 800 mm, the right end region of the bed bed portion (61) is 200 mm from the right edge of the bed bed portion (61) toward the widthwise central portion of the bed bed portion (61). This is a width region, and the left end region of the bed bed portion (61) is a width region of 200 mm from the left side edge of the bed bed portion (61) toward the center in the width direction of the bed bed portion (61). However, in this invention, the edge part area | region of a bed bed part (61) is not limited to said area | region.

  Moreover, in the verification examples 1-3 shown below, n1-n8 used in the case of determination is as follows.

First determination formula (1): n1 = 0.25
Second judgment formula (2): n2 = 0.25
Third determination formula (3): n3 = 0.25
Fourth determination formula (4): n4 = 0.25
Fifth determination formula (5): n5 = 0.25
Sixth determination formula (6): n6 = 0.25
Seventh determination formula (7): n7 = 0.25
Eighth determination formula (8): n8 = 0.25

<Verification Example 1>
As shown in FIG. 10, when the subject (H) is lying in a supine posture along the length direction of the bed bed portion (61) at the center in the width direction of the bed bed portion (61), W1, W2, W3 and W4 were as follows.

W1 = 28kgf
W2 = 29kgf
W3 = 20kgf
W4 = 23kgf

  In the above case, the coordinates (GX, GY) of the gravity center position (G) of the subject (H) were calculated by the conventional detection method. That is, the coordinates of the gravity center position (G) were calculated by the above formulas (101) and (102). The results are as follows.

GX = 140mm
GY = -16mm

  Therefore, the center of gravity (G) of the subject (H) is in the substantially central region of the bed bed (61).

  On the other hand, in the above case, it was determined whether or not each determination formula (1-8) was satisfied. As a result, none of the determination formulas are satisfied.

<Verification Example 2>
As shown in FIG. 11, when the subject (H) is in a supine posture along the length direction of the bed bed (61) at the right end of the bed bed (61), W1, W2, W3 and W4 were as follows.

W1 = 46kgf
W2 = 9kgf
W3 = 37kgf
W4 = 8kgf

  In the above case, the coordinates (GX, GY) of the gravity center position (G) of the subject (H) were calculated by the conventional detection method. The results are as follows.

GX = 100mm
GY = 264mm

  Therefore, the center of gravity (G) of the subject (H) is in the right end region of the bed bed (61).

  On the other hand, in the above case, it was determined whether or not each determination formula (1-8) was satisfied. As a result, the sixth judgment formula (6) and the eighth judgment formula (8) are satisfied.

  Therefore, the subject (H) moves in the width direction of the bed bed portion (61) in parallel with the length direction of the bed bed portion (61) as shown in FIG. In this case, it is possible to detect that the bed position of the subject (H) has reached the end region of the bed bed (61) by any of the conventional detection method and the detection method of the present invention.

<Verification Example 3>
As shown in FIG. 12, the subject (H) placed his head at the left end of the bed bed (61), and placed his foot at the substantially center in the width direction of the bed bed (61). W1, W2, W3, and W4 were as follows when lying in a side-by-side posture. In this sleeping figure, a part of the head of the subject (H) protrudes outside the left end of the bed sleeping part (61). Therefore, there is a possibility that the subject (H) falls from the bed bed (61). In addition, when the subject (H) tries to get out of bed, he often becomes this sleeping figure.

W1 = 10kgf
W2 = 42kgf
W3 = 36kgf
W4 = 12kgf

  In the above case, the coordinates (GX, GY) of the gravity center position (G) of the subject (H) were calculated by the conventional detection method. The results are as follows.

GX = 40mm
GY = -32mm

  Therefore, the center of gravity (G) of the subject (H) is in the substantially central region of the bed bed (61).

  On the other hand, in the above case, it was determined whether or not each determination formula (1-8) was satisfied. As a result, the fifth determination formula (5) is satisfied.

  Therefore, when the sleeping posture of the subject (H) is in the state shown in FIG. 12, the conventional detection method determines that the bed position of the subject (H) is in the end region of the bed sleeping portion (61). Although it cannot, it can be determined by the detection method of the present invention.

  That is, when the sleeping posture of the subject (H) changes from the state shown in FIG. 10 to the state shown in FIG. 12, the conventional detection method cannot detect a change in the sleeping posture of the subject (H). In the detection method of the present invention, a change in the sleeping posture of the subject (H) can be detected. Therefore, according to the detection method of the present invention, a value corresponding to the sleeping posture of the subject that could not be detected by the conventional detection method can be detected, that is, a value corresponding to various sleeping postures of the subject can be detected.

The present invention relates to, for example, a bed occupancy state detection method for detecting a bed occupancy state of a subject on a bed lie (eg, a value corresponding to the sleeping state of the subject, bed leaving, bed occupancy, body movement), It can be used for a detection device and a bed-status monitoring system.

DESCRIPTION OF SYMBOLS 20 ... Bed presence state detection apparatus 21a ... 1st load detection means 21b ... 2nd load detection means 21c ... 3rd load detection means 21d ... 4th load detection means 22 ... Control apparatus 30 ... Calculation apparatus 31 ... Calculation part 31a ... load value calculation means 31c ... total load value calculation means 31d ... maximum and minimum load value calculation means 31e ... head side load value calculation means 31f ... head side load value decrease amount calculation means 32 ... storage unit 32a ... total load value storage means 32b ... Floor load value storage means 32c ... Head load value storage means 32d ... Setting value storage means 33 ... Determination unit 33a ... First determination means 33b ... Second determination means 33c ... Third determination means 33d ... Fourth determination means 33e ... fifth determination means 33f ... sixth determination means 33g ... seventh determination means 33h ... eighth determination means 33i ... ninth determination means 33j ... tenth determination means 33k ... eleventh determination means 3 l ... 12th determination means 33m ... In-bed determination means 40 ... 2nd communication apparatus 40a ... 1st communication means 40b ... 2nd communication means 40c ... 3rd communication means 40d ... 4th communication means 50 ... Notification apparatus 50a ... 1st Informing means 50b ... second informing means 50c ... third informing means 50d ... fourth informing means 60 ... bed 61 ... bed bed 70 ... bed occupancy status monitoring system H ... subject

Claims (2)

The first load detecting means (21a) applies the load applied to the right side of the bed bed (61) where the subject (H) is present to the first left side of the bed bed (61). The load applied to the right side of the bed bed (61) by the two load detection means (21b) is applied to the right side of the bed bed (61) by the third load detection means (21c). A load detection step of detecting the load by the fourth load detection means (21d);
The load value output from the first load detection means (21a) is W1, the load value output from the second load detection means (21b) is W2, and the load output from the third load detection means (21c). When the value is W3 and the load value output from the fourth load detection means (21d) is W4,
W1 / W3 ≦ n1 (1)
However, 0 <n1 <1 (n1: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
A first determination step (S11) for determining whether or not the first determination formula (1) is satisfied;
W3 / W1 ≦ n2 (2)
However, 0 <n2 <1 (n2: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
A second determination step (S12) for determining whether or not the second determination formula (2) is satisfied;
W2 / W4 ≦ n3 (3)
However, 0 <n3 <1 (n3: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
A third determination step (S13) for determining whether or not the third determination formula (3) is satisfied;
W4 / W2 ≦ n4 Formula (4)
However, 0 <n4 <1 (n4: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
A fourth determination step (S14) for determining whether or not the fourth determination formula (4) is satisfied;
W1 / W2 ≦ n5 (5)
However, 0 <n5 <1 (n5: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
A fifth determination step (S15) for determining whether or not the fifth determination formula (5) is satisfied;
W2 / W1 ≦ n6 Formula (6)
However, 0 <n6 <1 (n6: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
A sixth determination step (S16) for determining whether or not the sixth determination formula (6) is satisfied;
W3 / W4 ≦ n7 (7)
However, 0 <n7 <1 (n7: a preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
A seventh determination step (S17) for determining whether or not the seventh determination formula (7) is satisfied;
W4 / W3 ≦ n8 (8)
However, 0 <n8 <1 (n8: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
An eighth determination step (S18) for determining whether or not the eighth determination formula (8) is satisfied;
When it is determined that the determination result of at least one determination step among the first to eighth determination steps (S11 to S18) satisfies the determination formula, the bed position of the subject (H) is the bed sleeping portion ( 61) a first notification step (S21) of notifying the notification target person of information indicating that it is in the end region;
A total load value calculating step (S2) for calculating a total load value A obtained by summing the four load values (W1 to W4) output from the first to fourth load detecting means (21a to 21d);
A total load value storage step (S3) for storing the total load value A calculated in the total load value calculation step (S2);
When the total load value A calculated in the total load value calculation step (S2) is equal to or greater than a predetermined load value for a predetermined time, it is determined that the subject (H) is present on the bed sleeping portion (61). If not, the presence determination step (S4) for determining that the subject (H) is not present on the bed sleeping portion (61),
When it is determined in the determination result of the presence determination step (S4) that the subject (H) is present on the bed laying portion (61), the total load value when the predetermined time elapses is determined as the subject (H). A bed load value storage step (S5) for storing as a bed load value B in a state where the bed is on the bed bed portion (61),
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: a preset value for determining whether or not the posture of the subject (H) is the end sitting position)
A ninth determination step (S31) for determining whether or not the ninth determination formula (9) is satisfied;
With
When it is determined that the ninth determination formula (9) is satisfied in the determination result of the ninth determination step (S31), it is determined that the posture of the subject (H) is the end sitting position. How to detect bed occupancy. First load detecting means (21a) for detecting a load applied to the right head side of the bed bed portion (61) where the subject (H) is present, and a load applied to the left head portion of the bed bed portion (61). Second load detecting means (21b) for detecting, third load detecting means (21c) for detecting a load applied to the right side of the bed bed (61), and left side of the bed bed (61) A fourth load detecting means (21d) for detecting a load applied to
The load value output from the first load detection means (21a) is W1, the load value output from the second load detection means (21b) is W2, and the load output from the third load detection means (21c). When the value is W3 and the load value output from the fourth load detection means (21d) is W4,
W1 / W3 ≦ n1 (1)
However, 0 <n1 <1 (n1: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
First determination means (33a) for determining whether or not the first determination formula (1) is satisfied;
W3 / W1 ≦ n2 (2)
However, 0 <n2 <1 (n2: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
Second determination means (33b) for determining whether or not the second determination formula (2) is satisfied;
W2 / W4 ≦ n3 (3)
However, 0 <n3 <1 (n3: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
Third determination means (33c) for determining whether or not the third determination formula (3) is satisfied;
W4 / W2 ≦ n4 Formula (4)
However, 0 <n4 <1 (n4: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
A fourth determination means (33d) for determining whether or not the fourth determination formula (4) is satisfied;
W1 / W2 ≦ n5 (5)
However, 0 <n5 <1 (n5: a preset value for determining whether or not the subject's (H) occupancy position is in the end region of the bed sleeping portion (61))
Fifth determination means (33e) for determining whether or not the fifth determination formula (5) is satisfied;
W2 / W1 ≦ n6 Formula (6)
However, 0 <n6 <1 (n6: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
Sixth determination means (33f) for determining whether or not the sixth determination formula (6) is satisfied;
W3 / W4 ≦ n7 (7)
However, 0 <n7 <1 (n7: a preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
Seventh determination means (33g) for determining whether or not the seventh determination formula (7) is satisfied;
W4 / W3 ≦ n8 (8)
However, 0 <n8 <1 (n8: preset value for determining whether or not the subject (H) is in the bed area (61) in the end region)
An eighth determination means (33h) for determining whether or not the eighth determination formula (8) is satisfied;
When it is determined that the determination result of at least one determination means among the first to eighth determination means (33a to 33h) satisfies the determination formula, the bed position of the subject (H) is the bed bed ( 61) first notification means (50a) for notifying the notification target person that the information is in the end region;
A total load value calculating means (31c) for calculating a total load value A obtained by adding up the four load values (W1 to W4) output from the first to fourth load detecting means (21a to 21d);
Total load value storage means (32a) for storing the total load value A calculated by the total load value calculation means (31c);
When the total load value A calculated by the total load value calculation means (31c) is equal to or greater than the predetermined load value for a predetermined time, it is determined that the subject (H) is present on the bed sleeping portion (61). If not, the subject determination (H) determines that the subject (H) is not present on the bed (61),
When it is determined that the subject (H) is present on the bed and the bed (61) in the determination result of the presence determination means (33m), the total load value when the predetermined time elapses is determined as the subject (H). A bed load value storage means (32b) for storing as a bed load value B in a state where the bed is on the bed bed (61);
A ≦ B × m1 Formula (9)
However, 0 <m1 <1 (m1: a preset value for determining whether or not the posture of the subject (H) is the end sitting position)
Ninth determination means (33i) for determining whether or not the ninth determination expression (9) is satisfied;
With
When it is determined in the determination result of the ninth determination means (33i) that the ninth determination formula (9) is satisfied, it is determined that the posture of the subject (H) is the end sitting position. Bed presence detection device.

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