JP5204263B2 - Bed presence detection method and bed presence detection device - Google Patents

Description

  The present invention relates to a bed occupancy status detection method for detecting the occupancy status of a subject on the bed part of the bed, such as getting out of bed, entering the floor, and the position of the center of gravity.

  As a method for detecting bed conditions such as getting out of bed, landing (landing), center of gravity of subjects such as sick people, elderly people, care recipients, infants, etc. who are on the bed part of the bed, Something like that is known.

  That is, the load applied to the four legs of the bed is detected by the load detector as the load applied to the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed. And based on the output load of these load detectors, the center-of-gravity position of the subject on the bed bed is detected. Then, based on the center of gravity position, the movement distance, movement speed, number of movements, etc. of the subject on the bed and the number of movements are calculated, and the presence of the subject is detected based on the calculation result (for example, patent) Reference 1 and 2).

  Japanese Patent Application Laid-Open No. 2000-105884 discloses a method for detecting the entrance or leaving of a subject based on a load detection output voltage from a load detector that detects a load applied to each leg of the bed. (See Patent Document 3).

Japanese Patent No. 3098997 Japanese Patent No. 3529332 JP 2000-105884 A

  By the way, informing a caregiver that the subject on the bed has left the bed is important for nursing the subject. Moreover, in order to perform the care quickly when the subject leaves the bed, it is necessary to detect the bed leaving behavior of the subject as quickly as possible.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to detect a bed occupancy state that can quickly detect a subject's bed leaving behavior, and a bed occupancy state detection device used in the detection method. And a bed occupancy monitoring system using the detection device.

  The present invention provides the following means.

[1] Load detection for detecting loads applied to the head side left end, head side right end, foot side left end and foot side right end of the bed bed by four load detection means corresponding to the respective ends. Process,
A center-of-gravity position calculation step of calculating the center-of-gravity position of the subject on the bed bed based on the output loads of the four load detection means;
A center-of-gravity position storing step for storing the center-of-gravity position calculated in the center-of-gravity position calculating step;
When the center-of-gravity position calculated in the center-of-gravity position calculating step is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed sleeping part to the bed-covering area at the center of the bed sleeping part, A gate whose center of gravity crosses among a plurality of gates set between the plurality of boarding / alighting areas in the bed portion and the floor area is stored as an entrance gate where the center of gravity crosses when the subject enters the floor. An entrance gate storage process to perform,
When the barycentric position calculated in the barycentric position calculating step moves from the floor area in the bed sleeping portion to any one of the boarding / alighting areas, the barycentric position of the plurality of gates is The crossing gate is compared with the entrance gate stored in the entrance gate storage process as the exit gate where the center of gravity crosses when the subject leaves the floor, and it is determined whether the exit gate is the same as the entrance gate. A gate determination step to perform,
A bed in-situ state detection method comprising: a notifying step of notifying information related to getting out of the subject based on a determination result of the gate determining step.

  [2] The bed occupancy state detection method according to item 1 above, which includes a communication step of transmitting information related to getting out of the subject.

[3] Load detection for detecting loads applied to the head side left end, head side right end, foot side left end and foot side right end of the bed bed by four load detection means corresponding to the respective ends. Process,
A center-of-gravity position calculation step of calculating the center-of-gravity position of the subject on the bed bed based on the output loads of the four load detection means;
A center-of-gravity position storing step for storing the center-of-gravity position calculated in the center-of-gravity position calculating step;
When the center-of-gravity position calculated in the center-of-gravity position calculating step is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed sleeping part to the bed-covering area at the center of the bed sleeping part, A gate whose center of gravity crosses among a plurality of gates set between the plurality of boarding / alighting areas in the bed portion and the floor area is stored as an entrance gate where the center of gravity crosses when the subject enters the floor. An entrance gate storage process to perform,
When the center of gravity position calculated in the center of gravity position calculation step is within the bed area of the bed sleeping portion, whether or not the movement range of the center of gravity position within a predetermined time is within a circular area of a predetermined radius, An in-bed determination step of determining whether the subject is in bed,
When it is determined that the subject is present in the determination result of the presence determination step, the total output load of the four load detection means is stored as a load in a state where the subject is present on the bed sleeping portion. Bed load storage process;
When it is determined that the subject is present in the determination result of the presence determination process, the load applied to the left end of the bed and the right end of the head of the bed bed is detected among the four load detection means. A load change calculating step of calculating a time change of the total output load of the two load detecting means;
A first determination step of determining whether a time change in the total output load calculated in the load change calculation step is equal to or less than a predetermined threshold;
When it is determined in the determination result of the first determination step that the time change of the total output load is equal to or less than the threshold value, the center of gravity position calculated in the center of gravity position calculation step is within the bed area of the bed lying portion. A second determination step of determining whether or not there is,
When it is determined in the determination result of the second determination step that the center of gravity position is not in the floor area, the center of gravity position calculated in the center of gravity position calculation step is the plurality of the center of gravity positions from the floor area in the bed lying portion. The gate where the center of gravity crosses among the plurality of gates when moving to any one of the boarding / alighting regions of the plurality of gates as the exit gate where the center of gravity crosses when the subject leaves the floor. Compared with the entrance gate stored in the storage step, a gate determination step for determining whether the exit gate is the same as the entrance gate,
A bed in-situ state detection method comprising: a notifying step of notifying information related to getting out of the subject based on a determination result of the gate determining step.

  [4] When it is determined in the determination result of the gate determination step that the getting-off gate is the same as the entering gate, it is determined in the notification step that the subject has started getting-off behavior as information regarding the getting-off of the subject. 6. The bed occupancy status detection method according to item 5 described above.

[5] When it is determined in the determination result of the gate determination step that the leaving gate is different from the entrance gate, the current total output load of the four load detecting means is stored in the siding load storing step. A third determination step of determining whether or not the floor load is equal to or less than a predetermined ratio,
When it is determined in the determination result of the third determination step that the bed load is equal to or less than the predetermined ratio, it is reported in the notification step that the subject is in the behavior of leaving the floor as information on the subject's bed leaving. 5. The bed presence state detection method according to 3 or 4 above.

  [6] The bed occupancy state detection method according to any one of items 3 to 5, further comprising a communication step of transmitting information related to getting out of the subject.

[7] Load detection for detecting loads applied to the head side left end portion, head side right end portion, foot side left end portion and foot side right end portion of the bed bed portion by four load detecting means corresponding to the respective end portions. Process,
A center-of-gravity position calculation step of calculating the center-of-gravity position of the subject on the bed bed based on the output loads of the four load detection means;
A center-of-gravity position storing step for storing the center-of-gravity position calculated in the center-of-gravity position calculating step;
When the center-of-gravity position calculated in the center-of-gravity position calculating step is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed sleeping part to the bed-covering area at the center of the bed sleeping part, A gate whose center of gravity crosses among a plurality of gates set between the plurality of boarding / alighting areas in the bed portion and the floor area is stored as an entrance gate where the center of gravity crosses when the subject enters the floor. An entrance gate storage process to perform,
When the center of gravity position calculated in the center of gravity position calculation step is within the bed area of the bed sleeping portion, whether or not the movement range of the center of gravity position within a predetermined time is within a circular area of a predetermined radius, An in-bed determination step of determining whether the subject is in bed,
When it is determined that the subject is present in the determination result of the presence determination step, the total output load of the four load detection means is stored as a load in a state where the subject is present on the bed sleeping portion. Bed load storage process;
When it is determined in the determination result of the occupancy determination step that the subject is present, it is determined whether or not the centroid position calculated in the centroid position calculation step is within the occupancy region of the bed sleeping portion. A first determination step;
When it is determined in the determination result of the first determination step that the center of gravity position is not in the floor area, the center of gravity position calculated in the center of gravity position calculation step is the plurality of the center of gravity positions from the floor area in the bed sleeping portion. The gate where the center of gravity crosses among the plurality of gates when moving to any one of the boarding / alighting regions of the plurality of gates as the exit gate where the center of gravity crosses when the subject leaves the floor. Compared with the entrance gate stored in the storage step, a gate determination step for determining whether the exit gate is the same as the entrance gate,
A bed in-situ state detection method comprising: a notifying step of notifying information related to getting out of the subject based on a determination result of the gate determining step.

[8] When it is determined in the determination result of the gate determination step that the getting-off gate is the same as the entry gate, the head-side left end portion and the head-side right end portion of the bed bed portion among the four load detecting means. A load change calculating step for calculating a time change of the total output load of the two load detecting means for detecting the load applied to each of the load,
A second determination step of determining whether a time change of the total output load calculated in the load change calculation step is equal to or less than a predetermined threshold value,
When it is determined in the determination result of the second determination step that the time change of the total output load is equal to or less than the threshold value, the subject starts the bed leaving action as information on the subject's bed leaving in the notification step. 8. The bed occupancy status detection method according to item 7 described above.

[9] When it is determined in the determination result of the gate determination step that the leaving gate is different from the entrance gate, the current total output load of the four load detecting means is stored in the siding load storing step. A third determination step of determining whether or not the floor load is equal to or less than a predetermined ratio,
When it is determined in the determination result of the third determination step that the bed load is equal to or less than the predetermined ratio, it is reported in the notification step that the subject is in the behavior of leaving the floor as information on the subject's bed leaving. 9. The bed presence state detection method according to 7 or 8 above.

  [10] The bed occupancy status detection method according to any one of items 7 to 9, further comprising a communication step of transmitting information related to getting out of the subject.

[11] Four load detection means for detecting loads applied to the head side left end, the head side right end, the foot side left end, and the foot side right end of the bed bed,
A center-of-gravity position calculating means for calculating the center-of-gravity position of the subject on the bed bed based on output loads of the four load detecting means;
Centroid position storage means for storing the centroid position calculated by the centroid position calculation means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed-bed part to the floor area at the center of the bed-bed part, A gate whose center of gravity crosses among the plurality of gates set between the plurality of boarding / alighting areas and the floor area in the bed is stored as an acquisition gate whose center of gravity crosses when the subject enters the floor. Entry gate storage means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means moves from the floor area in the bed sleeping portion to any one of the plurality of boarding / alighting areas, the center-of-gravity position of the plurality of gates is The crossing gate is compared with the entrance gate stored in the entrance gate storage means as the exit gate with the center of gravity traversed when the subject leaves, and it is determined whether the exit gate is the same as the entrance gate. Gate determination means to perform,
A bed occupancy status detection apparatus, comprising: a notification unit configured to notify information related to getting out of a subject based on a determination result of the gate determination unit.

  [12] The bed occupancy status detection apparatus according to the above item 11, which includes communication means for transmitting information related to getting out of the subject.

[13] Four load detection means for detecting loads applied to the head side left end, the head side right end, the foot side left end, and the foot side right end of the bed bed,
A center-of-gravity position calculating means for calculating the center-of-gravity position of the subject on the bed bed based on output loads of the four load detecting means;
Centroid position storage means for storing the centroid position calculated by the centroid position calculation means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed-bed part to the floor area at the center of the bed-bed part, A gate whose center of gravity crosses among a plurality of gates set between the plurality of boarding / alighting areas in the bed portion and the floor area is stored as an entrance gate where the center of gravity crosses when the subject enters the floor. An entry gate storage means to perform,
When the center of gravity position calculated by the center of gravity position calculating means is within the bed area of the bed sleeping portion, whether or not the movement range of the center of gravity position within a predetermined time is within a circular area of a predetermined radius, Occupancy determination means for determining whether or not the subject is occupying the bed;
When it is determined that the subject is present in the determination result of the presence determination means, the total output load of the four load detection means is stored as a load in a state where the subject is present on the bed sleeping portion. Bed load storage means;
When it is determined that the subject is present in the determination result of the presence determination means, the load applied to the head left end and the head right end of the bed bed is detected among the four load detection means. Load change calculating means for calculating the time change of the total output load of the two load detecting means;
First determination means for determining whether a time change of the total output load calculated by the load change calculation means is equal to or less than a predetermined threshold;
When it is determined in the determination result of the first determination means that the time change of the total output load is equal to or less than the threshold value, the gravity center position calculated by the gravity center position calculation means is within the bed area of the bed bed portion. Second determination means for determining whether there is,
When it is determined in the determination result of the second determination means that the center of gravity position is not in the floor area, the center of gravity position calculated by the center of gravity position calculation means is the plurality of the center positions from the floor area in the bed lying portion. The gate where the center of gravity crosses among the plurality of gates when moving to any one of the boarding / alighting regions of the plurality of gates as the exit gate where the center of gravity crosses when the subject leaves the floor. Compared with the entrance gate stored in the storage means, the gate determination means for determining whether the leaving gate is the same as the entrance gate;
A bed occupancy status detection apparatus, comprising: a notification unit configured to notify information related to getting out of a subject based on a determination result of the gate determination unit.

  [14] When it is determined in the determination result of the gate determining means that the leaving gate is the same as the entering gate, it is determined by the notifying means that the subject has started leaving action as information regarding the subject's getting out of bed. 14. The bed occupancy status detection device according to item 13 configured to notify.

[15] When it is determined in the determination result of the gate determination means that the getting-off gate is different from the entrance gate, the current total output load of the four load detection means is stored in the floor load storage means. Provided with a third determination means for determining whether or not the ratio is equal to or less than a predetermined ratio with respect to the bed load,
If it is determined in the determination result of the third determination means that the bed load is equal to or less than the predetermined ratio, the notification means notifies the fact that the test subject is moving out as information on the test subject's bed leaving. 15. The bed occupancy status detection device according to item 13 or 14 described above.

  [16] The bed occupancy state detection device according to any one of items 13 to 15 above, comprising communication means for transmitting information related to getting out of the subject.

[17] Four load detection means for detecting loads applied to the head side left end, the head side right end, the foot side left end, and the foot side right end of the bed bed,
A center-of-gravity position calculating means for calculating the center-of-gravity position of the subject on the bed bed based on output loads of the four load detecting means;
Centroid position storage means for storing the centroid position calculated by the centroid position calculation means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed-bed part to the floor area at the center of the bed-bed part, A gate whose center of gravity crosses among a plurality of gates set between the plurality of boarding / alighting areas in the bed portion and the floor area is stored as an entrance gate where the center of gravity crosses when the subject enters the floor. An entry gate storage means to perform,
When the center of gravity position calculated by the center of gravity position calculating means is within the bed area of the bed sleeping portion, whether or not the movement range of the center of gravity position within a predetermined time is within a circular area of a predetermined radius, Occupancy determination means for determining whether or not the subject is occupying the bed;
When it is determined that the subject is present in the determination result of the presence determination means, the total output load of the four load detection means is stored as a load in a state where the subject is present on the bed sleeping portion. Bed load storage means;
When it is determined in the determination result of the occupancy determining means that the subject is present, it is determined whether or not the centroid position calculated by the centroid position calculating means is within the occupying area of the bed lying portion. First determination means;
When it is determined in the determination result of the first determination means that the center of gravity position is not within the floor area, the center of gravity position calculated by the center of gravity position calculation means is the plurality of the center positions from the floor area in the bed sleeping portion. The gate where the center of gravity crosses among the plurality of gates when moving to any one of the boarding / alighting regions of the plurality of gates as the exit gate where the center of gravity crosses when the subject leaves the floor. Compared with the entrance gate stored in the storage means, the gate determination means for determining whether the leaving gate is the same as the entrance gate;
A bed occupancy status detection apparatus, comprising: a notification unit configured to notify information related to getting out of a subject based on a determination result of the gate determination unit.

[18] When it is determined in the determination result of the gate determination means that the getting-off gate is the same as the entry gate, the head-side left end and the head-side right end of the bed bed portion among the four load detection means Load change calculating means for calculating the time change of the total output load of the two load detecting means for detecting the load applied to each of the load,
Second determination means for determining whether the time change of the total output load calculated by the load change calculation means is equal to or less than a predetermined threshold,
When it is determined in the determination result of the second determination means that the time change of the total output load is equal to or less than the threshold value, the notification means informs that the subject has started getting out of bed as information related to getting out of the subject. 18. The bed occupancy status detection device according to item 17 configured to notify.

[19] When it is determined in the determination result of the gate determination means that the getting-off gate is different from the entry gate, the current total output load of the four load detection means is stored in the floor load storage means. Provided with a third determination means for determining whether or not the ratio is equal to or less than a predetermined ratio with respect to the bed load,
If it is determined in the determination result of the third determination means that the bed load is equal to or less than the predetermined ratio, the notification means notifies the fact that the test subject is moving out as information on the test subject's bed leaving. 19. The bed occupancy status detection device according to item 17 or 18 above configured as described above.

  [20] The bed occupancy state detection device according to any one of items 17 to 19, further comprising a communication unit that transmits information related to getting out of the subject.

[21] Four load detection means for detecting loads applied to the head side left end, the head side right end, the foot side left end, and the foot side right end of the bed bed,
A center-of-gravity position calculating means for calculating the center-of-gravity position of the subject on the bed bed based on output loads of the four load detecting means;
Centroid position storage means for storing the centroid position calculated by the centroid position calculation means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means is moved from any one of the plurality of getting-on / off areas in the peripheral part of the bed-bed part to the floor area at the center of the bed-bed part, A gate whose center of gravity crosses among the plurality of gates set between the plurality of boarding / alighting areas and the floor area in the bed is stored as an acquisition gate whose center of gravity crosses when the subject enters the floor. Entry gate storage means;
When the center-of-gravity position calculated by the center-of-gravity position calculating means moves from the floor area in the bed sleeping portion to any one of the plurality of boarding / alighting areas, the center-of-gravity position of the plurality of gates is The crossing gate is compared with the entrance gate stored in the entrance gate storage means as the exit gate with the center of gravity traversed when the subject leaves, and it is determined whether the exit gate is the same as the entrance gate. Gate determination means to perform,
A bed occupancy status monitoring system, comprising: a notification unit configured to notify information related to getting out of the subject based on a determination result of the gate determination unit.

[22]
22. The bed occupancy status monitoring system according to item 21 above, comprising communication means for transmitting information related to getting out of the subject.

  The invention [1] has the following effects. That is, in general, when a subject such as a cared person goes to bed in a hospital or a nursing facility, take off footwear such as slippers and shoes and then enter the bed sleeping area, or get off the wheelchair and then the bed sleeping area. I'm on the floor. When the subject leaves the floor, the subject usually leaves the bed on the bed bed from the side where the footwear or wheelchair is placed. That is, the bed entry position and the bed leaving position of the bed sleeping portion are often the same. Based on this fact, the present inventor completed the present invention.

  That is, according to the invention of [1], in the gate determining step, when the subject leaves the floor, the floor gate where the center of gravity has crossed is compared with the floor gate, and it is determined whether the floor gate is the same as the floor gate. To do. And in an alerting | reporting process, the information regarding a test subject's bed leaving is alert | reported with respect to a caregiver, a supervisor, etc. based on the determination result of a gate determination process. Thereby, a test subject's bed leaving behavior can be detected rapidly. That is, in the notification process, when it is determined in the determination result of the gate determination process that the getting-off gate is the same as the entry gate, for example, the subject is notified that the getting-off action has started. By doing so, it can be notified immediately after the subject starts the bed leaving action.

  In the invention of [2], information about the subject's getting out of bed can be transmitted to a remote place, a mobile phone, etc., so that the information about the subject's getting out of bed is notified to the person in the remote place or the owner of the mobile phone. Can do.

  In addition to the process of the invention of [1], the invention of [3] further includes a bed determination process, a bed load storage process, a load change calculation process, a first determination process, and a second determination process. And. Therefore, the invention [3] has the following effect in addition to the effect of the invention [1].

  That is, in the presence determination step, it is determined whether or not the subject is present.

  Next, in the occupancy load storage step, when it is determined in the determination result of the occupancy determination step that the subject is present, the load in the state where the subject is present on the bed sleeping portion, that is, the occupancy load is stored. .

  Further, in the load change calculation step and the first determination step, when it is determined that the subject is present in the determination result of the presence determination step, the head side left end portion of the bed bed portion among the four load detection means and It is determined whether or not the time change of the total output load of the two load detecting means for detecting the load applied to the right side end of the head side is equal to or less than a predetermined threshold value. Thereby, it can be determined whether or not the subject has raised his / her upper body in the bed area of the bed sleeping portion.

  In the second determination step, when it is determined in the determination result of the first determination step that the temporal change in the total output load is equal to or less than a predetermined threshold, that is, the subject wakes up in the bed area of the bed sleeping portion. If it is determined that the center of gravity is within the bed area of the bed, the center of gravity is determined.

  Next, in the gate determination step, if it is determined in the determination result of the second determination step that the center of gravity position is not in the floor area, it is determined whether or not the leaving gate where the center of gravity has crossed is the same as the entrance gate. .

  And in an alerting | reporting process, the information regarding a test subject's bed leaving is alert | reported with respect to a caregiver, a supervisor, etc. based on the determination result of a gate determination process.

  Since this notification is performed after first determining that the subject is present and then determining that the subject has raised his / her upper body in the bed area of the bed sleeping portion, information on the subject's getting out of bed is accurately obtained. Can be notified.

  According to the invention of [4], in the notification step, when it is determined in the determination result of the gate determination step that the getting-off gate is the same as the entering gate, the subject is informed that the subject has started getting-off behavior. . Thereby, it can alert | report that immediately after a test subject starts a bed leaving action.

  According to the invention of [5], in the third determination step, when it is determined in the determination result of the gate determination step that the getting-off gate is different from the entrance gate, the current total output load of the four load detecting means is calculated. It is determined whether or not the ratio is less than a predetermined ratio with respect to the bed load. Thereby, for example, it can be determined whether or not the subject has put his feet on the bed installation surface.

  Then, in the notification step, when it is determined in the determination result of the third determination step that the bed load is equal to or less than the predetermined ratio, that is, for example, when it is determined that the subject has put his foot on the bed installation surface. The subject is informed that the subject is getting out of bed. Thereby, even when the subject crosses the gate different from the entrance gate when the subject leaves the floor, the notification can be made during the subject's leaving action.

  Furthermore, this notification is made when it is determined that the current total output load of the four load detection means is equal to or less than a predetermined ratio with respect to the bed load, that is, for example, the subject puts his / her foot on the bed installation surface. Since it is performed when it is determined that the user has arrived, it is possible to accurately notify that the subject is in the action of getting out of bed.

  [6] In the invention of [6], information about getting out of the subject can be transmitted to a remote place, a mobile phone, etc., and the information about getting out of the subject is notified to the person in the remote place or the owner of the mobile phone. Can do.

  In the invention of [7], in addition to the process of the invention of [1], a bed determination process, a bed load storage process, and a first determination process are further provided. Therefore, the invention [7] has the following effect in addition to the effect of the invention [1].

  That is, in the presence determination step, it is determined whether or not the subject is present.

  Next, in the occupancy load storage step, when it is determined in the determination result of the occupancy determination step that the subject is present, the load in the state where the subject is present on the bed sleeping portion, that is, the occupancy load is stored. .

  Moreover, in a 1st determination process, when it determines with a test subject having been in bed in the determination result of a bed determination process, it determines after that whether a gravity center position exists in a bed area.

  Next, in the gate determination step, when it is determined in the determination result of the first determination step that the gravity center position is not in the floor area, it is determined whether or not the leaving gate where the gravity center position has crossed is the same as the entry gate. .

  And in an alerting | reporting process, the information regarding a test subject's bed leaving is alert | reported with respect to a caregiver, a supervisor, etc. based on the determination result of a gate determination process.

  Since this notification is performed when it is determined that the position of the center of gravity is not within the occupancy area, it is possible to accurately notify information relating to the subject's getting out of bed.

  According to the invention of [8], in the load change calculation step and the second determination step, when it is determined in the determination result of the gate determination step that the leaving gate is the same as the entry gate, four load detection means It determines whether the time change of the total output load of the two load detection means which detects the load each applied to the head side left end part and head side right end part of a bed bed part is below a predetermined threshold value. Thereby, it can be determined whether or not the subject has raised his / her upper body in the boarding / alighting area of the bed bed.

  In the notification step, when it is determined in the determination result of the second determination step that the time change of the total output load is equal to or less than the predetermined threshold, that is, it is determined that the subject has raised his / her body in the getting-on / off region of the bed bed. If this happens, the subject is informed that he has started getting out of bed. Thereby, it can alert | report that immediately after a test subject starts a bed leaving action.

  Further, since this notification is performed after it is determined that the subject has raised his / her upper body in the boarding / alighting area of the bed sleeping portion, it is possible to accurately notify that the subject has started to get out of bed.

  According to the invention of [9], in the third determination step, when it is determined in the determination result of the gate determination step that the getting-off gate is different from the entrance gate, the current total output load of the four load detecting means is It is determined whether or not the ratio is below a predetermined ratio with respect to the bed load. Thereby, for example, it can be determined whether or not the subject has put his feet on the bed installation surface.

  Then, in the notification step, when it is determined in the determination result of the third determination step that the bed load is equal to or less than the predetermined ratio, the fact is notified that the subject is in bed leaving behavior. Thereby, even when the subject crosses the gate different from the entrance gate when the subject leaves the floor, the notification can be made during the subject's leaving action.

  Further, this notification is made when it is determined that the current total output load of the four load detection stages is equal to or less than a predetermined ratio with respect to the bed load, that is, for example, the subject puts his feet on the bed installation surface. Since it is performed when it is determined that the subject has been present, it can be accurately informed that the subject is in bed leaving behavior.

  [10] In the invention of [10], information related to the subject's getting out of bed can be transmitted to a remote place, a mobile phone, or the like, thereby notifying the person in the remote place or the owner of the mobile phone of information related to getting out of the subject. Can do.

  In the inventions [11] to [20], it is possible to provide a bed occupancy status detection device that can be suitably used in the bed occupancy status detection method according to the inventions [1] to [10].

  In the invention of [21], it is possible to reliably monitor the presence of the subject.

  In the invention of [22], the subject's bed situation can be monitored at a remote place or the like.

It is the schematic which shows the occupancy status detection apparatus of the bed which concerns on 1st 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. 6 is a flowchart continued from FIG. 5. It is a block diagram which shows the structure of the bed presence condition detection apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart of the presence status detection method using the same detection apparatus. FIG. 9 is a flowchart continued from FIG. 8. FIG.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  First, a first embodiment of the present invention will be described below with reference to FIGS.

  In FIG. 1, (1A) is a bed occupancy state detection apparatus according to the first embodiment of the present invention, and (20) is a bed.

  The bed (20) is used in a medical facility (eg, a hospital), an elderly facility, a nursing facility, a general household, and the like. The bed (21) of the bed (20) is formed in a rectangular shape in plan view as shown in FIG. This bed (20) is installed on a bed installation surface (29) comprising a floor surface of 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 on the bed sleeping portion (21), the head side of the subject (H) is placed on the bed. The head side of the bed part (21), the foot side of the subject (H) is the foot side of the bed bed part (21), the left side of the subject (H) is the left side of the bed bed part (21), and the right side of the subject (H) Is referred to as the right side of the bed bedding (21).

  As shown in FIG. 1, the bed (20) has four legs that support the bed (21) in a substantially horizontal position at a predetermined height, that is, the head left leg (26) and the head side. It has a right leg part (26), a foot side left leg part (26), and a foot side right leg part (26). At the lower ends of these four legs (26, 26, 26, 26), a rotatable bed moving caster (26a) is provided. In the present invention, the caster (26a) is not necessarily provided at the lower end of the leg (26).

  On the bed part (21) of this bed (20), as a subject (H), a sick person, a cared person, an elderly person, a healthy person, an infant, etc. can go to bed, rest, recuperation, medical examination, examination, etc. Therefore, he is in a supine posture. In addition, a dementia patient etc. are specifically mentioned as a sick person or a care receiver.

  As shown in FIG. 2, in this bed (20), the subject (H) enters and leaves (that is, gets on and off) from a plurality of getting on / off regions (22) at the periphery of the bed (21). In this embodiment, the boarding / alighting area (22) of the bed bed (21) includes the boarding / alighting area (22) of the head side left edge of the bed bed (21) and the boarding / alighting area (22) of the foot side left edge. And a boarding / alighting area (22) at the right edge of the head and a boarding / alighting area (22) at the right edge of the foot.

  As shown in FIG. 1, in this bed (20), the subject (H) is placed on the bed side bed (21) from above the bed bed (21) on the head side left edge and the head side right edge, respectively. A fall prevention fence (27) for preventing the fall on the bed installation surface (29) is detachably attached. Therefore, the test subject (H) is a foot side left edge which is a boarding / alighting area to which the fall prevention fence (27) is not attached among the four boarding / alighting areas (22, 22, 22, 22) of the bed bed (21). From either the boarding / alighting area (22) of the foot or the boarding / alighting area (22) of the foot side right edge (in FIG. 1, from the boarding / alighting area (22) of the foot side left edge), footwear such as slippers and shoes (28 ) Or get off the wheelchair (not shown) and enter the bed (21). Therefore, footwear (28) or a wheelchair is placed on the side of the boarding area (22) where the subject (H) enters the floor among the four boarding areas (22, 22, 22, 22) of the bed bed (21). ing. When the subject (H) leaves the floor, the subject (H) usually has the same boarding / alighting area as the boarding / alighting area on the side where the footwear (28) or wheelchair is placed, that is, the boarding / alighting area (22) when entering the floor (22). 22).

  The fall prevention fence (27) can be removed from the head side left edge and head side right edge of the bed bed (21) and attached to the foot side left edge and foot side right edge. ing. Therefore, when the fall prevention fence (27) is attached to the left side edge or the right side edge of the bed bed (21), the subject (H) gets on and off the bed bed (21). Of the areas (22, 22, 22, 22), the entry to the bed bed (21) is made from either the boarding / alighting area (22) at the head left edge or the boarding / alighting area (22) at the head right edge. And getting off (that is, getting on and off).

  Moreover, in FIG. 2, (23) is an in-bed area of the center part of a bed bed part (21). This bed area (23) is an area where the center of gravity of the subject (H) is present at bedtime in the bed bed (21). In other words, when the subject (H) is present on the bed bed (21) for going to bed, the center of gravity of the subject (H) is present in the presence area (23). The floor area (23) is located on the inner side (that is, on the center side) than the four boarding / alighting areas (22, 22, 22, 22) in the bed sleeping section (21). Specifically, the distances c1 between the left and right ends of the floor area (23) and the left and right edges of the bed bed portion (21) are each 20 to 40 cm (more specifically, 30 cm, for example). Further, the distance c2 between both the head side and foot side ends of the floor area (23) and the head side and foot side edges of the bed bed (21) is, for example, 20 to 40 cm (more specifically, 30 cm). Etc.).

  However, in this invention, the magnitude | size and position of a floor area (23) in a bed bed part (21) are not limited to being in said range.

  The size and position of the bed area (23) in the bed bed portion (21) are preset and stored in the bed area storage means (12f) described later.

  Further, (25) is a gate. In the present embodiment, the number of gates (25) is four. These four gates (25, 25, 25, 25) are all virtual, and the circumferential direction of the bed bed (21) is between the peripheral edge and the center of the bed bed (21). Are set side by side. More specifically, these four gates (25, 25, 25, 25) are provided for the four getting-on / off areas (22, 22, 22, 22) on the peripheral edge of the bed bed (21) and the bed bed (21). It is set between the floor area (23) in the center. More specifically, one gate (this is referred to as “head side left gate”) between the boarding / alighting area (22) and the floor area (23) at the head side left edge of the bed bed (21) (25). ) Is set to extend from the intermediate position in the longitudinal direction of the bed bed portion (21) to the head side edge (or its vicinity). Moreover, one gate (this is called "head side right gate") (25) between the boarding / alighting area | region (22) of the head side right edge part of a bed sleeping part (21) and a floor area (23), (25), It is set to extend from the intermediate position in the longitudinal direction of the bed bed portion (21) to the head side edge (or its vicinity). Moreover, one gate (this is called "foot side left gate") (25) between the boarding / alighting area | region (22) of the foot side left edge part of a bed sleeping part (21), and a floor area (23), (25), It is set to extend from the intermediate position in the longitudinal direction of the bed bed (21) to the foot side edge (or its vicinity). Moreover, one gate (this is called "foot side right gate") (25) between the boarding / alighting area | region (22) of the foot side right edge part of a bed sleeping part (21) and a floor area (23), It is set to extend from the intermediate position in the longitudinal direction of the bed bed (21) to the foot side edge (or its vicinity).

  In the gate (25), the position of the center of gravity of the subject (H) is from the peripheral portion (specifically, each getting-on / off region (22)) of the bed sleeping portion (21) to the center portion of the bed sleeping portion (21). When moving to the region (23)), it is estimated that the subject (H) will be present for bedtime if he moves to the center side of the bed bed (21) than here. Set to position. Therefore, the gate (25) can also be expressed as a “flooring line”.

  The position of the gate (25) will be described in detail. The head side left gate (25) and the foot side left gate (25) are, for example, 10 to 30 cm from the left edge of the bed bed (21) (more specifically, 20 cm). Etc.) Set to the inner position. That is, in FIG. 2, the distance d1 from the left edge of the bed bed (21) to the head side left gate (25) and the foot side left gate (25) is, for example, 10 to 30 (more specifically, 20 cm). Moreover, the head side right gate (25) and the foot side right gate (25) are set at positions on the inner side of, for example, 10 to 30 cm (more specifically, 20 cm or the like) from the right edge of the bed bed portion (21). That is, in FIG. 2, the distance d2 from the right edge of the bed bed (21) to the head side right gate (25) and the foot side right gate (25) is, for example, 10 to 30 (more specifically, 20 cm or the like). .

  However, in the present invention, the position of the gate (25) is not limited to being within the above range.

  The position of the gate (25) is preset and stored in a gate position storage means (12a) described later.

  Moreover, the area | region outside the position of each gate (25) in a bed bed part (21) is set as each boarding area (22) of a bed bed part (21).

  In addition, the bed area (23) of the bed bed (21) is located inside the position of each gate (25) in the bed bed (21).

  As shown in FIGS. 1 and 3, the bed occupancy state detection apparatus (1A) of this embodiment includes four load detection means (2, 2, 2, 2, 2) and a controller (3). And a first communication means (4), a calculator (10), a notification means (15), and a second communication means (16).

  The presence status of the subject (H) detected by the presence status detection device (1A) includes getting out of the subject (H), entering the floor, position of the center of gravity, intensity of body movement, turning over, and body movement. Such as frequency.

  The four load detection means (2, 2, 2, 2) detect the load applied to the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed (21), respectively. It is configured by a load cell or the like. In this embodiment, on the load detection surfaces of the four load detection means (2, 2, 2, 2) installed on the bed installation surface (29), the corresponding leg portions ( 26) By loading the caster (26a in detail), the load applied to the head side left end, head side right end, foot side left end and foot side end of the bed bed (21) is detected. It is supposed to be.

  The number of times of detection of the load per second by each load detecting means (2) is preferably 2 times / second or more, and more preferably 4 / second or more and 10,000 times / second or less. However, in the present invention, the number of times of detection of the load per second by each load detection means (2) is not limited to being within the above range.

  In the present embodiment, each load detection means (2) outputs a voltage corresponding to the magnitude of the load applied to each end of the bed bed (21) as an output load.

  Output voltages as output loads of the four load detection means (2, 2, 2, 2) are transmitted to a controller (3) that controls the output voltage of the load detection means wirelessly or by wire.

  As shown in FIG. 3, the controller (3) includes an amplifying means (3a) for amplifying the output voltage of each load detecting means (2), and an output voltage (output signal) amplified by the amplifying means (3a). A / D conversion means (3b) for converting the analog signal into the digital signal.

  The first communication means (4) outputs the output signal of the controller (3), that is, the signal digitally converted by the A / D conversion means (3b), to a predetermined line such as a telephone line network, the Internet, a wired LAN, and a wireless LAN. The data is transmitted to a computing unit (10) that performs various computations via a wired communication network or a wireless communication network. In this embodiment, it is comprised so that it may transmit to a calculator (10) via a wireless communication network. In FIG. 1, (10a) is a receiving antenna of the computing unit (10).

  The computing unit (10) includes a computing means (11), a storage means (12), and a judging means (13), and is constituted by a computer having a CPU, ROM, RAM, and other memories.

  The calculation means (11) includes a load calculation means (11a), a gravity center position calculation means (11b), and a load change calculation means (11c).

  The load calculation means (11a) calculates the output load of each load detection means (2) based on the output voltage of each load detection means (2).

  Here, the output voltage of the load detection means (2) for detecting the load applied to the head side left end portion of the bed bed portion (21) is V1, and the load for detecting the load applied to the head side right end portion of the bed bed portion (21). The output voltage of the detection means (2) is V2, the output voltage of the load detection means (2) for detecting the load applied to the left end of the bed bed (21) is V3, and the foot side of the bed bed (21) The output voltage of the load detection means (2) for detecting the load applied to the right end is V4. Further, the output loads of the load detection means (2) are W1, W2, W3 and W4, respectively. W1, W2, W3, and W4 are values obtained by subtracting the tare such as the weight of the bed (20), that is, the loads after the tare processing.

  W1, W2, W3 and W4 are calculated (calculated) by the following equations (i) to (iv).

W1 = a1 * V1 + b1 (i)
W2 = a2 * V2 + b2 (ii)
W3 = a3 × V3 + b3 (iii)
W4 = a4 × V4 + b4 (iv)
However, a1, a2, a3 and a4 are constants other than 0 set in advance. B1, b2, b3 and b4 are preset constants.

  Further, the load calculating means (11a) calculates the total output load (that is, W1 + W2 + W3 + W4) of the four load detecting means (2, 2, 2, 2) and the four load detecting means (2, 2, 2). 2 and 2), the total output load (ie, W1 + W2) of the two load detecting means (2, 2) for detecting the load applied to the head-side left end and the head-side right end of the bed bed (21). ).

  The center-of-gravity position calculation means (11b) is based on the output load of the four load detection means (2, 2, 2, 2), and the center-of-gravity position of the subject (H) on the bed bed (21). (H) the center of gravity position of the weight) is calculated, and more specifically, on the bed bed (21) based on the output loads of the four load detection means (2, 2, 2, 2). The center of gravity position of the subject (H) is calculated over time. Specifically, the coordinates GX and GY of the gravity center position are calculated by the following expressions (v) and (vi) (see FIG. 2).

GX = {(W1 + W3)-(W2 + W4)} × BX / (W1 + W2 + W3 + W4) (v)
GY = {(W1 + W2) − (W3 + W4)} × BY / (W1 + W2 + W3 + W4) (vi)
However, BX is the length of the bed bed (21) in the longitudinal direction. BY is the length in the short side direction (that is, the width direction) of the bed bed (21). The coordinates GX and GY of the center of gravity position are orthogonal coordinates, and the origin O (0, 0) is the center position of the bed bed portion (21).

  The load change calculating means (11c) detects the load applied to the head side left end part and the head side right end part of the bed bed part (21) among the four load detection means (2, 2, 2, 2). A time change of the total output load (W1 + W2) (this is referred to as “head-side load”) of the individual load detection means (2, 2) is calculated. That is, the load change calculation means (11c) calculates the ratio of the total output load after a predetermined time has elapsed with respect to the total output load (W1 + W2) of the two load detection means (2, 2). In this embodiment, the load change calculation means (11c) calculates the ratio of the total output load after 10 seconds, for example, to the total output load (W1 + W2) of these two load detection means (2, 2). In detail, when the total output load (W1 + W2) is A and the total output load (W1 + W2) after 10 seconds is B, for example, the value of B / A is calculated.

  The storage means (12) includes a gate position storage means (12a), a centroid position storage means (12b), an entrance gate storage means (12c), a occupancy load storage means (12d), and a occupancy center of gravity position storage. Means (12e), floor area storage means (12f), and boarding area storage means (12g) are provided.

  The gate position storage means (12a) presets and stores the positions of the four gates (25, 25, 25, 25) in the bed bed (21). In the present embodiment, the positions of the four gates (25, 25, 25, 25) preset and stored in the gate position storage means (12a) are as described above.

  The occupancy area storage means (12f) sets and stores in advance the size and position of the occupancy area (23) at the center of the bed sleeping portion (21). In the present embodiment, the size and position of the floor area (23) preset and stored in the floor area storage means (12f) are as described above.

  The boarding / alighting area storage means (12g) presets and stores the positions of the four boarding / alighting areas (22, 22, 22, 22) on the peripheral edge of the bed bed (21). In the present embodiment, the positions of the four getting on / off areas (22, 22, 22, 22) preset and stored in the getting on / off area storing means (12g) are as described above.

  However, in the present invention, since the bed area (23) of the bed bed (21) is located inside the position of each gate (25) in the bed bed (21), the gate position storage means ( The size and position of the floor area (23) can be calculated based on the position of each gate (25) preset and stored in 12a). Therefore, the computing unit (10) does not necessarily have to be provided with the floor area storage means (12f). Moreover, since each boarding / alighting area | region (22) of the bed bed part (21) is located outside the position of each gate (25) in the bed bed part (21), it is stored in the gate position storage means (12a). The position of each boarding area (22) can be calculated based on the position of each gate (25) set and stored in advance. Therefore, the computing unit (10) does not necessarily need to include the getting on / off area storage means (12g).

  The center-of-gravity position storage means (12b) stores the center-of-gravity position (its coordinates GX, GY) calculated by the center-of-gravity position calculation means (11b). More specifically, the center-of-gravity position storage means (12b) is calculated by the center-of-gravity position calculation means (11b). The center of gravity position (coordinates GX and GY of the center of gravity position) is stored as time passes.

  When the center of gravity calculated by the center of gravity position calculating means (11b) moves from the periphery of the bed bed (21) to the center, the entrance gate storage means (12c) has a peripheral edge of the bed bed (21). Out of four gates (25, 25, 25, 25) set one by one in the circumferential direction of the bed bed (21) between the central portion and the central portion, one gate (25 ) Is stored as an entrance gate at which the position of the center of gravity has crossed when the subject (H) enters the floor. In this embodiment, the central part of the bed bed part (21) from any one of the four boarding / alighting areas (22, 22, 22, 22) as the peripheral part of the bed bed part (21). The gate (25) whose center of gravity crosses among the four gates (25, 25, 25, 25) in the bed bed portion (21) is moved to the subject (H). Is stored as an entrance gate where the position of the center of gravity has crossed when entering.

  The occupancy load storage means (12d) includes four load detection means (2, 2, 2) when it is determined that the subject (H) is occupying the determination result of the occupancy determination means (13b) described later. 2), the total output load (W1 + W2 + W3 + W4) is stored as a load when the subject (H) is on the bed bed (21), that is, a bed load.

  The occupancy center of gravity position storage means (12e) is calculated by the centroid position calculation means (11b) when it is determined that the subject (H) is present in the determination result of the occupancy determination means (13b) described later. The position of the center of gravity is stored as the position of the center of gravity when the subject (H) is on the bed bed (21), that is, the position of the center of gravity.

  The determination means (13) includes a gate determination means (13a), a bed determination means (13b), a first determination means (13c), a second determination means (13d), and a third determination means (13e). It has.

  The gate determination means (13a) calculates the gravity center position when it is determined in the determination result of the second determination means (13b) described later that the gravity center position is not within the bed area (23) of the bed sleeping portion (21). When the center of gravity calculated by the means (11b) moves from the center of the bed bed (21) to the peripheral edge of the bed bed (21), the four gates (25, 25, 25, 25) The gate (25) crossing the center of gravity is compared with the entrance gate stored in the entrance gate storage means (12c) as the exit gate crossing the center of gravity when the subject (H) leaves the floor. It is determined whether or not the gate is the same as the entrance gate. In this embodiment, the center-of-gravity position calculated by the center-of-gravity position calculating means (11b) is 4 as the peripheral part of the bed-bed part (21) from the bed area (23) as the center part of the bed-bed part (21). A gate (4, 25, 25, 25) whose center of gravity has crossed when moving to any one of the boarding areas (22, 22, 22, 22). 25) is compared with the entrance gate stored in the entrance gate storage means (12c) as the exit gate where the center of gravity has crossed when the subject (H) leaves the floor, and the exit gate is the same as the entrance gate. It is determined whether or not there is.

  The occupancy determining means (13b) moves the centroid position within a predetermined time when the centroid position calculated by the centroid position calculating means (11b) is within the occupancy area (23) of the bed sleeping portion (21). Whether or not the subject (H) is in bed is determined based on whether or not the range is within a circle area (circle range) having a predetermined radius. In the present embodiment, the presence determination means (13b) determines whether or not the subject (H) is present depending on whether or not the 5-minute movement range of the center of gravity position is within a circle area (circle range) having a radius of 5 cm. This is a judgment. If the 5-minute movement range of the barycentric position is within a circular area having a radius of 5 cm, it is determined that the subject (H) is present, and if not, the subject (H) is present. Judge that it is not.

  The first determination means (13c) determines whether or not the time change of the total output load (W1 + W2) (head load) calculated by the load change calculation means (11c) is equal to or less than a predetermined threshold value. . In the present embodiment, the first determination means (13c) determines whether or not the time change of the total output load (W1 + W2) is 0.9 times or less as a predetermined threshold value. More specifically, the first determination means (13c) determines that the ratio of the total output load (W1 + W2) after the elapse of a predetermined time (for example, after 10 seconds) to the total output load (W1 + W2) is 0.9 (ie, 90%) or less. The threshold value used in the first determination means (13c) is preset and stored in a threshold value storage means (not shown) of the storage means (12).

  The second determining means (13d), when it is determined in the determination result of the first determining means (13c) that the time change of the total output load (W1 + W2) is not more than a predetermined threshold value, the center-of-gravity position calculating means (11b) It is determined whether or not the position of the center of gravity calculated in step lies within the bed area (23) of the bed sleeping portion (21).

  The third determination means (13e) determines whether the four load detection means (2, 2, 2, 2) are different in the determination result of the gate determination means (13a) when it is determined that the leaving gate is different from the entrance gate. Whether the total output load (W1 + W2 + W3 + W4) at the present time (that is, at the time of determination by the third determination means (13e)) is less than a predetermined ratio with respect to the bed load stored in the bed load storage means (12d) This is a judgment. In the present embodiment, the third determination means (13e) is configured such that the current total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is a predetermined ratio with respect to the bed load. It is determined whether it is 0.9 times or less. The predetermined ratio value used in the third determination means (13e) is preset and stored in a predetermined ratio storage means (not shown) of the storage means (12).

  The notifying means (15) is for notifying nurses, caregivers, supervisors, etc. of information related to getting out of the subject (H) based on the determination result of the gate determining means (13a). This notification means (15) is a speaker (15a) for notifying information about getting out of the subject (H) by sound such as voice or buzzer sound, a lamp (15b) for notifying information about getting out of the subject (H) by light, It has a display means (15c) (for example, liquid crystal display, CRT) etc. which alert | reports the information regarding a test subject's (H) bed leaving by the display of a character etc. This notification means (15) is, for example, installed in a nurse center, a caregiver's stuffing station, a monitoring room, or the like.

  The second communication means (16) transmits information related to getting out of the subject (H) via a predetermined wired communication network such as a telephone line network, the Internet, a wired LAN, and a wireless LAN, or a wireless communication network. (Including PHS, the same applies hereinafter) and the like.

  Next, a bed state detection method using the bed bed state detection device (1A) of the first embodiment will be described below based on the flowcharts shown in FIGS.

  First, as a preparatory step, the positions of the four gates (25, 25, 25, 25) of the bed bed (21) are set and stored in advance in the gate position storage means (12a) [gate position storage step]. The bed area (23) of the bed bed (21) is set and stored in advance in the bed area storage means (12f) [bed area storage step]. Further, the four getting on / off areas (22, 22, 22, 22) of the bed bed (21) are set and stored in advance in the getting on / off area storage means (12g) [boarding area storing step]. Next, the process proceeds to step S1.

  In step S1, four load detection means (2, 2, 2, 2) respectively apply to the head side left end portion, head side right end portion, foot side left end portion and foot side right end portion of the bed bed portion (21). The applied load is detected, and the output load of each load detection means (2, 2, 2, 2) is calculated by the load calculation means (11a) [load detection step]. Further, at this time, the output loads of the four load detection means (2, 2, 2, 2) are tared. Next, the process proceeds to step S2.

  In step S1, each load detection means (2) outputs a voltage corresponding to the magnitude of the load applied to each end of the bed bed (21) as an output load. And the output voltage as an output load of four load detection means (2, 2, 2, 2) is transmitted to a controller (3) wirelessly or by wire. The transmitted output voltage is amplified by the amplifying means (3a) of the controller (3), then converted from an analog signal to a digital signal by the A / D converting means (3b), and then the first communication means (4). Thus, the data is transmitted to the computing unit (10) via a predetermined wired communication network such as a telephone line network, the Internet, a wired LAN, and a wireless LAN, or a wireless communication network. Based on this transmitted signal, the output load after the tare processing is calculated by the load checking means (11a) of the calculator (11).

  In step S2, whether or not a load greater than a predetermined load, for example, 50 N (5 kgf) or more, is applied to the bed bed (21), that is, the total output load of the four load detection means (2, 2, 2, 2). Whether or not (W1 + W2 + W3 + W4) is 50N or more is determined by a predetermined determination means (not shown) provided in the arithmetic unit (10). If it is determined that the total output load is 50 N or more (in the case of “YES”), the process proceeds to step S3. On the other hand, if it is determined that the total output load is less than 50 N (in the case of “NO”), the process returns to step S2. In step S2, for example, it can be determined whether or not the subject (H) has put a hand or the like on the bed bed (21) to go to bed. In addition, the output load of each load detection means (2) is a load after a tare process. The same applies hereinafter. However, in the present invention, the predetermined load is not limited to 50 N, and can be variously set.

  In step S3, based on the output loads of the four load detection means (2, 2, 2, 2), the gravity center position of the subject (H) on the bed bed (21) is calculated by the gravity center position calculation means (11b). Calculate [centroid position calculation step]. Further, the center-of-gravity position calculated by the center-of-gravity position calculation means (11b) is stored in the center-of-gravity position storage means (12b) [centroid position storage step]. Next, the process proceeds to step S4. The calculation of the center of gravity position is performed by the above formulas (v) and (vi).

  In step S4, the computing unit (10) is provided with whether or not the center of gravity calculated by the center of gravity position calculating means (11b) is within the bed area (23) as the central part of the bed sleeping portion (21). It is determined by a predetermined determination means (not shown). If it is determined that the position of the center of gravity is in the floor area (23) (in the case of “YES”), the process proceeds to step S6. On the other hand, if it is determined that the position of the center of gravity is not within the floor area (23) (in the case of “NO”), the process proceeds to step S5.

  In step S5, it is determined whether or not a predetermined time or more, for example, 1 hour or more has elapsed since the center of gravity position was first stored in the center of gravity position storage means (11b). (Not shown). If it is determined that a predetermined time or more has elapsed since the center of gravity position was stored (in the case of “YES”), the process returns to step S1. On the other hand, when it is determined that the predetermined time or more has not elapsed since the center of gravity position was stored (in the case of “NO”), the process returns to step S3. However, in the present invention, the predetermined time is not limited to 1 hour, and can be variously set.

  In step S6, it is determined whether the total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is equal to or greater than a predetermined load, for example, 200 N (20 kgf). It is determined by a predetermined determination means (not shown) provided in the above. If it is determined that the total output load is 200 N or more (in the case of “YES”), the process proceeds to step S7. On the other hand, if it is determined that the total output load is less than 200 N (in the case of “NO”), the process returns to step S1. However, in the present invention, the predetermined load is not limited to 200 N, and can be variously set.

  In step S7, the center-of-gravity position calculated by the center-of-gravity position calculating means (11b) is one of the four getting-on / off areas (22, 22, 22, 22) as the peripheral part of the bed-bed part (21). The four gates (25, 25, 25) preset and stored in the gate position storage means (12a) when moving from the area (22) to the bed area (23) as the center of the bed bed (21). 25), the gate (25) whose center of gravity has crossed is stored in the entrance gate storage means (12c) as an entrance gate whose center of gravity has crossed when the subject (H) enters the floor [entry gate] Storage step]. Next, the process proceeds to step S8.

  In step S8, when the center-of-gravity position calculated by the center-of-gravity position calculating means (11b) is within the bed area (23) of the bed-bed portion (21), for example, the moving range of the center-of-gravity position within a predetermined time, for example, 5 minutes Is determined by the occupancy determining means (13b) as to whether it is within a circular area of a radius of 5 cm, for example, as a circular area having a predetermined radius [in-sector determination step]. If it is determined that the movement range is within the circular area (in the case of “YES”), the process proceeds to step S9 and is determined (determined) to be in bed. Next, the process proceeds to step S10. On the other hand, if it is determined that the moving range is not within the circular area (in the case of “NO”), the process returns to step S8. However, in the present invention, the predetermined time is not limited to 5 minutes, and can be set in various ways, and the predetermined radius is not limited to 5 cm, and is various. Can be set.

  In step S10, the total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is the load in the state where the subject (H) is on the bed bed (21), that is, the floor. The load is stored in the bed load storage means (12d) as a load [bed load storage step]. Further, the center of gravity position storage means (12e) stores the center of gravity position at this time as the bed center of gravity position [step of center of gravity position storage step]. Next, the process proceeds to step S11 shown in FIG.

  In step S11, two load detection means for detecting loads applied to the head side left end portion and the head side right end portion of the bed bed portion (21) among the four load detection means (2, 2, 2, 2). For example, the ratio of the total output load (W1 + W2) after 10 seconds with respect to the time change of the total output load (W1 + W2) (head side load) of (2, 2), that is, the total output load (W1 + W2) The load change calculation means (11c) calculates [load change calculation step]. Then, a first determination means (whether the time change of the total output load (W1 + W2) (head load) calculated by the load change calculation means (11c) is, for example, 0.9 times or less as a predetermined threshold. 13c) [First determination step]. If it is determined that the time change of the total output load is 0.9 times or less (in the case of “YES”), the process proceeds to step S12. On the other hand, if it is determined that the time change of the total output load exceeds 0.9 times (in the case of “NO”), the process returns to step S11. However, in the present invention, the predetermined time is not limited to 10 seconds, but can be set in various ways, and the predetermined threshold is limited to 0.9 times. Rather, it can be set in various ways.

  In this step S11, it can be determined whether or not the subject (H) has raised his / her upper body in the bed area (23) of the bed / bed portion (21). That is, when the time change of the total output load (W1 + W2) (head-side load) is 0.9 times or less, the subject (H) has the upper body in the bed area (23) of the bed sleeping portion (21). It can be determined that it has occurred. On the other hand, when it is determined that the time change of the total output load exceeds 0.9 times, it can be determined that the subject (H) does not wake up.

  In step S12, it is determined by the second determination means (13d) whether or not the gravity center position calculated by the gravity center position calculation means (11a) is within the bed area (23) of the bed sleeping portion (21) [first determination] 2 determination step]. If it is determined that the position of the center of gravity is not within the floor area (23) (in the case of “NO”), the process proceeds to step S13. On the other hand, if it is determined that the position of the center of gravity is in the floor area (23) (in the case of “YES”), the process returns to step S12.

  In step S13, the center-of-gravity position calculated by the center-of-gravity position calculation means (11a) is changed from four in the peripheral area of the bed bed part (21) to the bed part (21) from the floor area (23) as the center part of the bed bed part (21). Four gates (25, 25, 25) preset and stored in the gate position storage means (12a) when moving to any one of the boarding / alighting regions (22) among the boarding / alighting regions (22, 22, 22, 22). 25), the gate (25) whose center of gravity has crossed is used as a floor gate where the center of gravity has crossed when the subject (H) leaves the floor. In comparison, it is determined by the gate determination means (13a) whether or not the leaving gate is the same as the entrance gate [gate determination step]. If it is determined that the exit gate is the same as the entrance gate (in the case of “YES”), that is, the position of the center of gravity on the side where the footwear (28) or wheelchair is placed in the bed sleeping portion (21) When is moved, the process proceeds to step S14, and it is determined (determined) that the subject (H) has started to get out of bed. Subsequently, it progresses to step S15 and S16 sequentially. On the other hand, if it is determined that the exit gate is different from the entrance gate (in the case of “NO”), the process proceeds to step S17 shown in FIG.

  In step S15, as information regarding the leaving of the subject (H), the fact that the subject (H) has started getting out of bed (including that the subject (H) has predicted that the getting out behavior will soon be started) is notified. A means (15) notifies a nurse, a caregiver, a monitor, etc. immediately after the start of the bed leaving action of the subject (H) [notification process]. For example, the speaker (15a) notifies the subject (H) that he / she has started getting out of bed with sound or a sound such as a buzzer, or the lamp (15b) indicates that the subject (H) has started to get out of bed. Or by displaying on the display means (15c) a letter or the like indicating that the subject (H) has started getting out of bed. Based on such notification, nurses, caregivers and the like can perform necessary treatments on the subject (H), and can go to the care of the subject (H), for example.

  In step S16, the information regarding the getting-off of the subject (H) includes that the subject (H) has started getting-off behavior (including that the subject (H) has predicted that the getting-off behavior will soon be started). 2 Immediately after the start of the leaving action of the subject (H) by the communication means (16), the data is transmitted to a remote place, a mobile phone or the like. Thereby, the person in the remote place and the owner of the mobile phone can know that the subject (H) has started the bed leaving action.

  In step S17 shown in FIG. 6, the current total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is the bed load stored in the bed load storage means (12d). On the other hand, it is determined by the third determining means (13e) whether it is 0.9 times (that is, 90%) or less as a predetermined ratio or less [third determination step]. If it is determined that the ratio is 0.9 times or less (in the case of “YES”), the process proceeds to step S18, and it is determined (determined) that the subject (H) is in bed leaving behavior. Subsequently, it progresses to step S19 and S20 one by one. On the other hand, if it is determined that it exceeds 0.9 times (in the case of “NO”), the process returns to step S17. However, in the present invention, the predetermined ratio is not limited to 0.9 times (that is, 90%) and can be variously set.

  In this step S17, for example, it can be determined whether or not the subject (H) has put his foot on the bed installation surface (29) to get out of bed. That is, when the current total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is 0.9 times or less than the bed load, the subject (H) gets out of bed. Therefore, it can be determined that the foot has been put on the bed setting surface (29), and in detail, it can be determined that the subject (H) has put his foot on the bed setting surface (29) and further put his weight on the foot. On the other hand, when it exceeds 0.9 times, the subject (H) does not aim to get out of bed and does not put his feet on the bed installation surface (29) as the peripheral part of the bed bed (21). It can be determined that the vehicle exists on the boarding area (22, 22, 22, 22).

  In step S19, as information related to getting out of the subject (H), the notification means (16) informs the nurse (the caregiver, the monitor, etc.) that the subject (H) is in the action of getting out of the subject (H). Informing during leaving action [informing step]. For example, the speaker (15a) notifies the subject (H) that he / she is getting out of bed with a sound such as a voice or a buzzer, or the lamp (15b) indicates that the subject (H) is getting out of bed. Or by displaying a character or the like indicating that the subject (H) is getting out of bed on the display means (15c). Based on such notification, nurses, caregivers and the like can perform necessary treatments on the subject (H), and can go to the care of the subject (H), for example.

  In step S20, as information about the subject's (H) getting out of bed, the fact that the subject (H) is getting out of bed is displayed in the second communication means (16) while the subject (H) is getting out of the bed. Send to. Thereby, the person in the remote place and the owner of the mobile phone can know that the test subject (H) is in bed leaving behavior.

  Thus, the occupancy status detection method using the bed occupancy status detection device (1A) of the first embodiment has the following advantages.

  That is, in the gate determination step (S13), when the subject (H) leaves the floor, the floor gate where the center of gravity crosses is compared with the floor gate, and it is determined whether the floor gate is the same as the floor gate. And in an alerting | reporting process (S15), the information regarding a test subject's (H) bed leaving is alert | reported with respect to a caregiver, a supervisor, etc. based on the determination result of a gate determination process (S13). Thereby, the test subject's (H) bed leaving behavior can be detected quickly. That is, in the notification step (S15), when it is determined in the determination result of the gate determination step (S13) that the leaving gate is the same as the entrance gate, that is, the footwear (28) and the wheelchair in the bed sleeping portion (21). When the position of the center of gravity moves to the side where the person is standing, the subject (H) is informed that he / she has started getting out of bed. By doing so, it can be notified immediately after the subject (H) starts getting out of bed.

  Further, the notification first determines that the subject (H) is present, and then determines that the subject (H) has caused the upper body in the bed area (23) of the bed sleeping portion (21). Since it is performed, the information regarding getting out of the subject (H) can be accurately notified.

  Further, in the third determination step (S17), when it is determined in the determination result of the gate determination step (S13) that the getting-off gate is different from the entrance gate, the four load detecting means (2, 2, 2, 2). ) Current total output load (W1 + W2 + W3 + W4) is less than a predetermined ratio (for example, 0.9 times) with respect to the bed load. Accordingly, whether or not the subject (H) has put his feet on the bed setting surface (29) will be described in detail. The subject (H) puts his feet on the bed setting surface (29) and further gains weight on his feet. It is possible to determine whether or not it has been applied.

  In the notification step (S19), when it is determined in the determination result of the third determination step (S17) that the bed load is equal to or less than the predetermined ratio, that is, the subject (H) is on the bed installation surface (29). When it is determined that he / she has arrived, the subject (H) is notified that he / she is getting out of bed. Thereby, even when the center of gravity of the subject (H) crosses a gate different from the entrance gate when the subject (H) leaves the floor, the fact that the subject (H) is getting out of the floor is notified. Can do.

  Further, this notification is made when it is determined that the current total output load (W1 + W2 + W3 + W4) of the four load detection stages (2, 2, 2, 2) is not more than a predetermined ratio with respect to the bed load, that is, the subject. Since it is performed when it is determined that (H) has put a foot on the bed installation surface (29), it is possible to accurately notify that the subject (H) is taking a bed.

  Further, in the second communication step (S16, S20), information on getting out of the subject (H) is transmitted to a remote place or a mobile phone, etc., so that the subject (H H) Information regarding getting out of bed can be notified.

  Furthermore, in the bed occupancy status detection method of this embodiment, since it is not necessary to input the weight of the subject (H) in advance, the occupancy status can be easily detected, and the occupancy status detection apparatus The configuration (1A) can be simplified.

  The bed occupancy status monitoring system (30A) of the first embodiment of the present invention includes the bed occupancy status detection device (1A) of the first embodiment. Therefore, it is possible to reliably monitor the presence of the subject (H) in a remote place.

  Next, a second embodiment of the present invention will be described below with reference to FIGS. 7 to 9 focusing on differences from the first embodiment.

  In the bed occupancy state computing device (1B) according to the second embodiment of the present invention, as shown in FIG. 7, the judging means (13) of the computing unit (10) is connected to the gate judging means (13a). A floor determination means (13b), a fourth determination means (13f), a fifth determination means (13g), and a sixth determination means (13h) are provided.

  The gate determining means (13a) calculates the center of gravity position when it is determined that the center of gravity position is not within the bed area (23) of the bed sleeping portion (21) in the determination result of the fourth determining means (13f) described later. The center-of-gravity position calculated by the means (11a) is changed from the bed area (23) as the center part of the bed bed part (21) to the four boarding / alighting areas (22, 22, 22, 22) When moving to any one of the boarding / alighting regions (22), the gate (25) of which the center of gravity crosses among the four gates (25, 25, 25, 25) Compared with the entrance gate stored in the entrance gate storage means (12c) as the exit gate where the position of the center of gravity has crossed when leaving the floor, it is determined whether or not the exit gate is the same as the entrance gate It is.

  The occupancy determination means (13b) is the same as the occupancy determination means of the first embodiment.

  The fourth determination means (13f), when it is determined that the subject (H) is present in the determination result of the presence determination means (13b), then the gravity center position calculated by the gravity center position calculation means (11b) Is in the bed area (23) of the bed sleeping portion (21).

  The fifth determination means (13g) determines whether or not the time change of the total output load (W1 + W2) (head load) calculated by the load change calculation means (11c) is equal to or less than a predetermined threshold value. . In the present embodiment, the fifth determination means (13g) determines whether or not the time change of the total output load (W1 + W2) is 0.9 times or less as a predetermined threshold value. More specifically, the fifth determination means (13g) determines that the ratio of the total output load (W1 + W2) after the lapse of a predetermined time (for example, after 10 seconds) to the total output load (W1 + W2) is 0.9 (ie, 90%) or less. The threshold value used in the fifth determination means (13g) is preset and stored in a threshold value storage means (not shown) of the storage means (12).

  The sixth determination means (13h) determines that the four load detection means (2, 2, 2, 2) when the determination result of the gate determination means (13a) indicates that the leaving gate is different from the entrance gate. Whether the total output load (W1 + W2 + W3 + W4) at the present time (that is, at the time of determination by the sixth determination means (13h)) is equal to or less than a predetermined ratio with respect to the bed load stored in the bed load storage means (12d). Is determined. In the present embodiment, the sixth determination means (13h) sets the current total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) as a predetermined ratio to the bed load. It is determined whether it is 0.9 times or less. The predetermined ratio value used in the sixth determination means (13h) is preset and stored in a predetermined ratio storage means (not shown) of the storage means (12).

  Other configurations of the bed occupancy state calculation device (1B) of the second embodiment are the same as those of the first embodiment.

  Next, a bed state detection method using the bed bed state detection apparatus (1B) of the second embodiment will be described below based on the flowcharts shown in FIGS.

  In the bed occupancy status detection method of the second embodiment, steps S1 to S10 shown in FIG. 4 are performed in the same manner as in the first embodiment. Then, after step S10 is completed, the process proceeds to step S30 shown in FIG.

  In step S30, the fourth determining means (13f) determines whether or not the center of gravity calculated by the center of gravity position calculating means (11b) is within the bed area (23) of the bed-bed part (21) [first determination unit 13f]. 4 determination step]. If it is determined that the position of the center of gravity is not within the floor area (23) (in the case of “NO”), the process proceeds to step S31. On the other hand, if it is determined that the position of the center of gravity is in the floor area (23) (in the case of “YES”), the process returns to step 30.

  In step S31, the center-of-gravity position calculated by the center-of-gravity position calculating means (11b) is changed from four in the peripheral area of the bed-bed part (21) from the floor area (23) as the center part of the bed-bed part (21). Four gates (25, 25, 25) preset and stored in the gate position storage means (12a) when moving to any one of the boarding / alighting regions (22) among the boarding / alighting regions (22, 22, 22, 22). 25), the gate (25) whose center of gravity has crossed is used as a floor gate where the center of gravity has crossed when the subject (H) leaves the floor. In comparison, it is determined by the gate determination means (13a) whether or not the leaving gate is the same as the entrance gate [gate determination step]. If it is determined that the exit gate is the same as the entrance gate (in the case of “YES”), that is, the position of the center of gravity on the side where the footwear (28) or wheelchair is placed in the bed sleeping portion (21) If has moved, the process proceeds to step S32. On the other hand, if it is determined that the exit gate is different from the entrance gate (in the case of “NO”), the process proceeds to step S36 shown in FIG.

  In step S32, two load detection means for detecting loads applied to the head side left end portion and the head side right end portion of the bed bed portion (21) among the four load detection means (2, 2, 2, 2). For example, the ratio of the total output load (W1 + W2) after 10 seconds with respect to the time change of the total output load (W1 + W2) (head side load) of (2, 2), that is, the total output load (W1 + W2) The load change calculation means (11c) calculates [load change calculation step]. Then, a fifth determining means (5) determines whether the time change of the total output load (W1 + W2) (head load) calculated by the load change calculating means (11c) is, for example, 0.9 times or less as a predetermined threshold value. 13g) [fifth determination step]. If it is determined that the time variation of the total output load is 0.9 times or less (in the case of “YES”), the process proceeds to step S33, and it is determined that the subject (H) has started to get out of bed. (decide. Subsequently, it progresses to step S34 and S35 one by one. On the other hand, if it is determined that the time change of the total output load exceeds 0.9 times (in the case of “NO”), the process returns to step S32. However, in the present invention, the predetermined time is not limited to 10 seconds, but can be set in various ways, and the predetermined threshold is limited to 0.9 times. Rather, it can be set in various ways.

  In this step S32, it can be determined whether or not the subject (H) has raised his / her upper body in the boarding / alighting area (22, 22, 22, 22) of the bed bed (21). That is, when the time change of the total output load (W1 + W2) (head load) is 0.9 times or less, the boarding / alighting area (22, 22, 22, 22) as the peripheral part of the bed bed (21) It can be determined that the subject (H) has raised his upper body. On the other hand, when it is determined that the time change of the total output load exceeds 0.9 times, it can be determined that the subject (H) does not wake up.

  In step S34, as information about the leaving of the subject (H), notification that the subject (H) has started getting out of bed (including that the subject (H) has predicted that the getting out behavior will soon be started) is notified. A means (15) notifies a nurse, a caregiver, a monitor, etc. immediately after the start of the bed leaving action of the subject (H) [notification process]. For example, the speaker (15a) notifies the subject (H) that he / she has started getting out of bed with sound or a sound such as a buzzer, or the lamp (15b) indicates that the subject (H) has started to get out of bed. Or by displaying on the display means (15c) a letter or the like indicating that the subject (H) has started getting out of bed. Based on such notification, nurses, caregivers and the like can perform necessary treatments on the subject (H), and can go to the care of the subject (H), for example.

  In step S35, the information regarding the getting-off of the subject (H) includes that the subject (H) has started getting-off (including that the subject (H) has predicted that the getting-off action will be started soon). 2 Immediately after the start of the leaving action of the subject (H) by the communication means (16), the data is transmitted to a remote place, a mobile phone or the like. Thereby, the person in the remote place and the owner of the mobile phone can know that the subject (H) has started the bed leaving action.

  In step S36 shown in FIG. 9, the current total output load (W1 + W2 + W3 + w4) of the four load detection means (2, 2, 2, 2) is the bed load stored in the bed load storage means (12d). On the other hand, it is determined by the sixth determining means (13h) whether it is 0.9 times (that is, 90%) or less as a predetermined ratio or less [sixth determination step]. Then, if it is determined that the ratio is 0.9 times or less (in the case of “YES”), the process proceeds to step S37, where it is determined (determined) that the subject (H) is in bed leaving behavior, It progresses to step S38 and S39 one by one. On the other hand, if it is determined that it exceeds 0.9 times (in the case of “NO”), the process returns to step S36. However, in the present invention, the predetermined ratio is not limited to 0.9 times (that is, 90%) and can be variously set.

  In this step S36, for example, it can be determined whether or not the subject (H) has put his foot on the bed installation surface (29) to get out of bed. That is, when the current total output load (W1 + W2 + W3 + W4) of the four load detection means (2, 2, 2, 2) is 0.9 times or less than the bed load, the subject (H) gets out of bed. Therefore, it can be determined that the foot has been put on the bed setting surface (29), and in detail, it can be determined that the subject (H) has put his foot on the bed setting surface (29) and further put his weight on the foot. On the other hand, when it exceeds 0.9 times, the subject (H) does not aim to get out of bed and does not put his feet on the bed installation surface (29) as the peripheral part of the bed bed (21). It can be determined that the vehicle exists on the boarding area (22, 22, 22, 22).

  In step S38, as information regarding the leaving of the subject (H), the notification means (16) notifies the nurse (the caregiver, the monitor, etc.) of the subject (H) that the subject (H) is getting out of bed. Informing during leaving action [informing step]. For example, the speaker (15a) notifies the subject (H) that he / she is getting out of bed with a sound such as a voice or a buzzer, or the lamp (15b) indicates that the subject (H) is getting out of bed. Or by displaying a character or the like indicating that the subject (H) is getting out of bed on the display means (15c). Based on such notification, nurses, caregivers and the like can perform necessary treatments on the subject (H), and can go to the care of the subject (H), for example.

  In step S39, as the information regarding the getting-off of the subject (H), the fact that the subject (H) is getting out of the bed is displayed in the second communication means (16) during the getting-off action of the subject (H). Send to. Thereby, the person in the remote place and the owner of the mobile phone can know that the test subject (H) is in bed leaving behavior.

  Therefore, the bed presence detection method using the bed bed detection device (1B) of the second embodiment has the following advantages.

  That is, in the gate determination means (S31), when the subject (H) leaves the floor, the floor gate where the center of gravity crosses is compared with the floor gate, and it is determined whether the floor gate is the same as the floor gate. And in an alerting | reporting process (S34), the information regarding a test subject's bed leaving is alert | reported with respect to a caregiver, a supervisor, etc. based on the determination result of a gate determination process (S31).

  Since this notification is performed when it is determined that the position of the center of gravity is not in the floor area (23), information regarding getting out of the subject (H) can be accurately notified.

  Furthermore, in the load change calculation step and the fifth determination step (both S32), when it is determined in the determination result of the gate determination step (S31) that the leaving gate is the same as the entrance gate, that is, the bed sleeping portion (21 ) In the left side of the head of the bed bed (21) among the four load detection means (2, 2, 2, 2) when the position of the center of gravity moves to the side where the footwear (28) or wheelchair is placed. Whether the time change of the total output load (W1 + W2) of the two load detection means (2, 2) for detecting the load applied to the right end of the head and the head side is less than a predetermined threshold value (for example, 0.9 times) Determine. Thereby, it can be determined whether the test subject (H) raised the upper body in the boarding area (22) as a peripheral part of the bed bed part (21).

  In the notification step (S34), when it is determined in the determination result of the fifth determination step (S32) that the time change of the total output load (W1 + W2) is not more than a predetermined threshold (for example, 0.9 times), that is, When it is determined that the subject (H) has raised his / her upper body in the boarding / alighting area (22, 22, 22, 22) as the peripheral portion of the bed sleeping portion (21), the subject (H) starts the bed leaving action. Notify that. By doing so, it can be notified immediately after the subject (H) starts getting out of bed.

  Furthermore, since this notification is performed after it is determined that the subject (H) has raised his / her upper body in the boarding / alighting area (22, 22, 22, 22) as the peripheral portion of the bed bed (21), the subject ( It is possible to accurately notify that H) has started to get out of bed.

  Furthermore, in the sixth determination step (S36), when it is determined in the determination result of the gate determination step (S31) that the getting-off gate is different from the entrance gate, the four load detection means (2, 2, 2, 2) are used. ) Current total output load (W1 + W2 + W3 + W4) is less than a predetermined ratio (for example, 0.9 times) with respect to the bed load. Accordingly, whether or not the subject (H) has put his feet on the bed setting surface (29) will be described in detail. The subject (H) puts his feet on the bed setting surface (29) and further gains weight on his feet. It can be determined whether or not it is hung.

  In the notification step (S38), when it is determined in the determination result of the sixth determination step (S36) that the bed load is equal to or less than the predetermined ratio, that is, the subject (H) moves on the bed installation surface (29). When it is determined that he / she has arrived, the subject (H) is notified that he / she is getting out of bed. Thereby, even when the center of gravity of the subject (H) crosses a gate different from the entrance gate when the subject (H) leaves the floor, the fact that the subject (H) is getting out of the floor is notified. Can do.

  Further, this notification is made when it is determined that the current total output load (W1 + W2 + W3 + W4) of the four load detection stages (2, 2, 2, 2) is not more than a predetermined ratio with respect to the bed load, that is, the subject. Since it is performed when it is determined that (H) has put a foot on the bed installation surface (29), it is possible to accurately notify that the subject (H) is taking a bed.

  Further, in the second communication step (S35, S39), information on getting out of the subject (H) is transmitted to a remote place, a mobile phone, etc., so that the subject (the owner of the mobile phone) H) Information regarding getting out of bed can be notified.

  Furthermore, in the bed occupancy status detection method of this embodiment, it is not necessary to input the weight of the subject (H) in advance, so that the occupancy status can be easily detected, and the occupancy status detection device The configuration (1B) can be simplified.

  The bed occupancy status monitoring system (30B) of the second embodiment of the present invention includes the bed occupancy status detection device (1B) of the second embodiment. Therefore, it is possible to reliably monitor the presence of the subject (H) in a remote place.

  Although only some embodiments of the present invention have been described above, the present invention is not limited to those described in the above embodiments, and various setting changes can be made.

  For example, in the said embodiment, the peripheral part of the bed bed part (21) is divided into four boarding / alighting areas (22), ie, the number of boarding / alighting areas (22) is the head side of a bed bed part (21). A boarding area (22) on the left edge, a boarding area (22) on the left side of the foot side, a boarding area (22) on the right side of the head side, and a boarding area (22) on the right side of the foot side There are a total of four, but in the present invention, the boarding / alighting area (22) at the left edge of the bed bed (21) and the boarding / alighting area (22) at the right edge of the bed bed (21) There may be. Furthermore, the number of boarding / alighting regions (22) may be two or a plurality other than four.

  In the present embodiment, the number of gates (25) is four. However, in the present invention, one gate (25) is located between the left edge and the center of the bed bed (21). The setting is stored in the storage means (12a), and another gate (25) is set and stored in the gate position storage means (12) between the right edge and the center of the bed bed (21). Also good. Furthermore, the number of gates (25) may be two or more than four.

  The present invention relates to a bed occupancy status detection method for detecting the occupancy status of a subject on the bed part of the bed, such as getting out of bed, entering the floor, and the center of gravity, and the bed occupancy status detection device used in the detection method And a bed occupancy status monitoring system using the detection device.

DESCRIPTION OF SYMBOLS 1A, 1B ... Bed presence state detection apparatus 2 ... Load detection means 3 ... Control means 4 ... 1st communication means 10 ... Calculator 11 ... Calculation means 11a ... Load calculation means 11b ... Gravity center position calculation means 11c ... Load change calculation Means 12 ... Storage means 12a ... Gate position storage means 12b ... Center of gravity position storage means 12c ... Entrance gate storage means 12d ... Floor load storage means 12f ... Floor area storage means 12g ... Boarding area storage means 13 ... Determination means 13a ... Gate determining means 13b ... presence determining means 13c ... first determining means 13d ... second determining means 13e ... third determining means 13f ... fourth determining means 13g ... fifth determining means 13h ... sixth determining means 15 ... notifying means 16 ... 2nd communication means 20 ... Bed 21 ... Bed part 22 ... Boarding area 23 ... Floor area 25 ... Gate 27 ... Fall prevention fence 28 ... Footwear 29 ... Bed installation surface 30A, 30 ... the bed situation of bed monitoring system H ... subject

Claims (8)

The load applied to each of the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed (21) is divided into four load detection means (2, 2, 2, a load detection step detected by 2) ,
The gravity center position for calculating the gravity center position of the subject (H) on the bed bed (21) based on the outputs (W1, W2, W3, W4) of the four load detection means ( 2, 2, 2, 2 ). Calculation step (S3) ;
The position of the center of gravity of the subject (H) calculated in the center-of-gravity position calculation step (S3) is located closer to the center than the peripheral edge (22, 22, 22, 22) of the bed bed (21) and the subject (H ) Is in the in-bed area (23) where it is estimated that the person will be in bed for sleeping, the bed-bed portion (21 ) among the four load detecting means ( 2, 2, 2, 2). ) A load change calculation step (S11) for calculating a time change of the total output (W1 + W2) of the two load detection means (2, 2) for detecting the load applied to the head side left end and the head right end of
When the time change of the total output (W1 + W2) calculated in the load change calculation step (S11) is equal to or less than a threshold value that determines that the predetermined subject (H) has raised his / her upper body , the bed bed (21) A first determination step (S11) for determining that the subject (H) has raised his / her upper body in the floor area (23), and otherwise determining that the subject (H) has not raised his / her upper body; A bed occupancy status detection method characterized by comprising: When the time variation of the computed sum output (W1 + W2) is determined to be less than or equal to the threshold value by the load change calculating step in the determination result of the first determination step (S11) (S11), the subject (H) is The bed occupancy status detection method according to claim 1, further comprising a notifying step (S15) for notifying that the subject (H) has started to get out of bed because the upper body is raised . The load applied to each of the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed (21) is divided into four load detection means (2, 2, 2, a load detection step detected by 2) ,
A center-of-gravity position calculation step (S3) for calculating the position of the center of gravity of the subject (H) on the bed bed (21) based on the outputs of the four load detection means ( 2, 2, 2, 2 ) ;
When the gravity center position of the subject (H) calculated by the gravity center position calculation means (S3) is in the peripheral part (22, 22, 22, 22) of the bed bed (21) , the four load detection means the total output of the bed bed portion of the (2,2,2,2) of two load detecting means for detecting a load applied respectively to the head side left portion and the head side right end portion of the (21) (2, 2) (W1 + W2 ) Load change calculation step (S32) for calculating the time change of
When the time change of the total output (W1 + W2) calculated in the load change calculation step (S32) is equal to or less than a threshold value that determines that the predetermined subject (H) has raised his / her upper body , the bed / bed portion (21) In the second determination step (S32 ), it is determined that the subject (H) has raised his / her upper body at the peripheral portions (22, 22, 22, 22), and otherwise the subject (H) has not raised his / her upper body. And a bed occupancy status detection method. When the time variation of the computed sum output (W1 + W2) is determined to be less than or equal to the threshold value in the second determination step (S32) the load change calculating step in the determination result of (S32), the subject (H) is 4. The bed occupancy status detection method according to claim 3, further comprising a notifying step (S33) for notifying that the subject (H) has started leaving the bed because the upper body is raised . Four load detection means (2 , 2, 2, 2) for detecting loads applied to the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed portion (21) , respectively;
The gravity center position for calculating the gravity center position of the subject (H) on the bed bed (21) based on the outputs (W1, W2, W3, W4) of the four load detection means ( 2, 2, 2, 2 ). Computing means (11b) ;
The position of the center of gravity of the subject (H) calculated by the center-of-gravity position calculating means (11b) is located closer to the center than the peripheral edge (22, 22, 22, 22) of the bed bed (21) and the subject (H ) Is in the in-bed area (23) where it is estimated that the person will be in bed for bedtime, the bed-bed portion (of the four load detection means (2, 2, 2, 2, and 3)) 21) a load change calculating means (11c) for calculating a time change of the total output (W1 + W2) of the two load detecting means (2, 2) for detecting the load applied to the head-side left end portion and the head-side right end portion, respectively. ,
When the time change of the total output (W1 + W2) calculated by the load change calculation means (11c) is less than or equal to a threshold value that determines that a predetermined subject (H) has raised his / her upper body , the bed / bed portion (21) First determination means (13c) for determining that the subject (H) has raised his / her upper body in the floor area (23), and otherwise determining that the subject (H) has not raised his / her upper body, A bed presence detection device characterized by that. When the time variation of the first determination means for the load change calculating means in the determination result of (13c) computed sum output (11c) (W1 + W2) is determined to be less than or equal to the threshold value, the subject (H) is 6. The bed occupancy status detection device according to claim 5, further comprising notification means (15) for notifying that the subject (H) has started to leave the bed because the upper body is raised . Four load detection means (2 , 2, 2, 2) for detecting loads applied to the head side left end, the head side right end, the foot side left end and the foot side right end of the bed bed portion (21) , respectively;
The gravity center position for calculating the gravity center position of the subject (H) on the bed bed (21) based on the outputs (W1, W2, W3, W4) of the four load detection means ( 2, 2, 2, 2 ). Computing means (11b) ;
When the gravity center position of the subject (H) calculated by the gravity center position calculation means (11b) is in the peripheral part (22, 22, 22, 22) of the bed bed (21) , the four load detection means the total output of the bed bed portion of the (2,2,2,2) of two load detecting means for detecting a load applied respectively to the head side left portion and the head side right end portion of the (21) (2, 2) (W1 + W2 ) Load change calculating means (11c) for calculating the time change of
When the time change of the total output (W1 + W2) calculated by the load change calculation means (11c) is less than or equal to a threshold value that determines that a predetermined subject (H) has raised his / her upper body , the bed / bed portion (21) Second determination means (13g ) for determining that the subject (H) has raised his / her upper body at the periphery (22, 22, 22, 22), and otherwise determining that the subject (H) has not raised his / her upper body ) and, the bed state detection system of the bed, characterized in that it comprises a. When the time variation of the second determination means for the load change calculating means in the determination result of (13 g) computed sum output (11c) (W1 + W2) is determined to be less than or equal to the threshold value, the subject (H) is The bed presence detection apparatus according to claim 7, further comprising notification means (15) for notifying that the subject (H) has started to leave the bed because the upper body is raised .

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