JP7172483B2 - STATE DETECTION DEVICE, STATE DETECTION METHOD, AND PROGRAM - Google Patents

Description

The present invention relates to a state detection device, state detection method, and program.

2. Description of the Related Art In hospitals, nursing care facilities, and the like, there is known a system for remotely monitoring the state of a person on a bed using a load sensor.

In addition, in the case of elderly people and people requiring nursing care who find it difficult to turn over on their own, there is a risk of developing pressure ulcers (so-called bedsores) if they remain in the same position without moving for a long period of time. There is In order to prevent pressure ulcers, it is necessary for a caregiver to change the patient's position. This posture change is usually performed every 1 to 2 hours.

In order to reduce the caregiver's burden of monitoring the person in bed, it is determined whether or not there is a change in position based on the body movement of the person in bed detected by the load sensor. , to present risk information for the occurrence of pressure ulcers to caregivers (see Patent Literature 1).

However, since the device described in Patent Document 1 detects whether or not there is a change in body position according to the degree of body movement, it may not be possible to accurately detect that there has been a change in body position. For example, the conventional device may erroneously detect that there has been a position change when an object such as a futon is placed on the bed while the care recipient is out of bed.

The technology disclosed has been devised to solve this problem in view of the above circumstances, and aims to detect with high accuracy whether or not a person in bed has changed their posture.

The disclosed technology includes a plurality of load sensors that detect the load applied to the bed, a vibration detection unit that detects vibration based on the outputs of the plurality of load sensors, and a total load based on the outputs of the plurality of load sensors. an amplitude of the vibration detected by the total load calculation unit to calculate and the vibration detection unit is equal to or greater than a threshold value, the total load calculated by the total load calculation unit is equal to or greater than a reference value, and the total load a determination unit that determines that the person on the bed has changed his or her position when the total load becomes less than the reference value within a certain period of time after the total load becomes equal to or greater than the reference value. It is a device.

ADVANTAGE OF THE INVENTION According to this invention, the presence or absence of the posture change of the bed person can be detected with high precision.

1 is a system configuration diagram of a status display system according to a first embodiment; FIG. FIG. 4 is an explanatory diagram showing the placement of the load sensor with respect to the bed; It is a block diagram which shows the hardware constitutions of an arithmetic unit. 3 is a block diagram illustrating functional units implemented by a CPU; FIG. It is a figure which illustrates various information memorize|stored in a memory|storage part. 4 is a flowchart for explaining display operation; FIG. 11 is a diagram showing a display example of a list image; It is a figure which shows an example of an icon. 4 is a block diagram illustrating the configuration of a postural change detection unit; FIG. 5 is a graph illustrating temporal changes in vibration information and total load information; FIG. 10 is a flow chart for explaining postural change detection processing by a postural change detection unit; FIG. It is a flowchart explaining the determination processing of pressure ulcer occurrence risk. FIG. 11 is a diagram illustrating a warning time setting table; It is a figure which shows the modification of a setting table. It is a figure which shows the example of a display of care record information. FIG. 11 is a flowchart for explaining postural change detection processing according to the first modification; FIG. FIG. 11 is a block diagram showing the configuration of a postural change detection unit according to a second modified example; FIG. 11 is a flowchart for explaining postural change detection processing according to a second modification; FIG. FIG. 10 is a diagram illustrating a center-of-gravity movement pattern during posture change;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description may be omitted.

In this specification, bed users are defined as patients who are being cared for in hospitals, nursing care facilities, etc., elderly people, people who need to be watched, or people who need to be monitored. Collectively, they are referred to as "in-bed residents."

[First embodiment]
A first embodiment of the present invention will be described below.

<Schematic configuration of the status display system>
FIG. 1 is a system configuration diagram of a status display system 100 according to the first embodiment. As shown in FIG. 1, the status display system 100 has an arithmetic device 1, four load sensors 2a to 2d, and a display device 3.

The load sensors 2a to 2d are, for example, load detectors that detect loads using beam-type load cells. For example, it is known from Patent Document 2 (Japanese Patent No. 4829020) and Patent Document 3 (Japanese Patent No. 4002905). The load sensors 2a to 2d are arranged under the legs of the bed 4 used by the person P in bed.

The status display system 100 is used in hospitals, nursing homes, and the like. One or more beds 4 are installed in each room of a hospital, a nursing facility, or the like. The state display system 100 functions as a state detection device that detects the state of the person on the bed 4 .

In this embodiment, the computing device 1 calculates the state information indicating the position, posture, presence or absence of postural change of the person in bed, etc. Data loggers (not shown) connected to the load sensors 2a to 2d For example, the state information may be calculated.

FIG. 2 is an explanatory diagram showing the arrangement of the load sensors 2a to 2d with respect to the bed 4. As shown in FIG. As shown in FIG. 2, the load sensors 2a-2d are arranged under casters 5a-5d attached to the lower ends of the four corner legs of the bed 4, respectively. A load detection signal output from each of the load sensors 2a to 2d is input to the arithmetic unit 1 via an amplifier or an A/D converter (not shown).

<Hardware Configuration of Arithmetic Device>
FIG. 3 is a block diagram showing the hardware configuration of the arithmetic device 1. As shown in FIG. As shown in FIG. 3, the arithmetic unit 1 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a HDD (Hard Disk Drive) 14, an input/output interface (input/output I/F) 15 and communication unit 16 are connected to each other via bus line 17 .

The input/output I/F 15 is connected to the load sensors 2a to 2d and the display device 3, as well as the operation section 18, the vital sensor 19, the speaker section 20, and the like.

The display device 3 is an electronic device having a display unit such as a PC (Personal Computer), a tablet terminal, or a smart phone. The display device 3 is not limited to a facility such as a hospital or nursing care facility, and may be located outside the facility. The display device 3 may be connected to the arithmetic device 1 via a network such as the Internet.

The operation unit 18 is a keyboard, a mouse, etc. that allow an operator to perform an input operation. The vital sensor 19 is a sensor that detects biological information such as body temperature, blood pressure, pulse, and respiratory rate of the person P, and is provided in each bed 4 .

A control program is stored in the HDD 14 . Although details will be described later, the CPU 11 executes a control program stored in the HDD 14 to control the display of list information and detailed information of each person P in bed.

<Functions of arithmetic unit>
FIG. 4 is a block diagram illustrating each functional unit realized by the CPU 11. As shown in FIG. Each functional unit is implemented by the CPU 11 executing processing based on a control program.

As shown in FIG. 4, the CPU 11 executes processing based on a control program to obtain a load information acquisition unit 30, a state determination unit 31, a biological information acquisition unit 32, a storage control unit 33, a state change detection unit 34, It functions as a postural change detection unit 35, a pressure ulcer determination unit 36, a display control unit 37, a notification control unit 38, an operation detection unit 39, and the like.

It should be noted that these functional units are not limited to being realized by software, and part or all of them may be realized by hardware such as an IC (Integrated Circuit).

The control program may be recorded in a computer-readable recording medium such as a CD-ROM or a flexible disk (FD) as an installable or executable file. Further, the control program may be provided by being recorded on a computer-readable recording medium such as a CD-R, DVD, Blu-ray Disc (registered trademark), semiconductor memory, or the like. Also, the control program may be provided by downloading via a network such as the Internet. Also, the control program may be stored in advance in a ROM or the like within the device.

The load information acquisition unit 30 acquires load detection signals output from the load sensors 2a to 2d as load information. The state determination unit 31 uses the load information acquired by the load information acquisition unit 30 to determine the state of the person P on the bed 4, such as the position and posture. The biometric information acquisition unit 32 acquires biometric information supplied from the vital sensor 19 .

The storage control unit 33 controls writing, reading, erasing, etc. of information with respect to storage units such as the HDD 14 and the RAM 13 . The load information acquired by the load information acquisition unit 30, the state information determined by the state determination unit 31, the biological information acquired by the biological information acquisition unit 32, and the like are written in the storage unit by the storage control unit 33.

The state change detection unit 34 detects a change in the state of the person P by comparing the state information obtained last time by the state determination unit 31 and the state information obtained this time. The postural change detection unit 35 detects that the person P who is in bed has been repositioned by a caregiver or the like based on the load information.

Note that the storage control unit 33 functions as a recording control unit for nursing care records, and records the detection result of the change in posture by the state change detection unit 34 as nursing care record information in the storage unit.

The pressure ulcer determination unit 36 determines the pressure ulcer risk based on the elapsed time from the position change detected by the position change detection unit 35 .

The display control unit 37 controls the display screen of the display device 3 to display list information and detailed information of each person P in bed. The notification control unit 38 performs predetermined notification control when an emergency is required for the person P in bed. In addition, the notification control unit 38 performs notification control of performing a predetermined display on the display screen of the display device 3, for example, when the risk of the bed sore occurrence of the bed occupant P increases.

The operation detection unit 39 detects an operator's operation using the operation unit 18, and enables a desired person P to perform an operation to display detailed information, an input to a care record, a correction operation, and the like.

<Various information stored in the storage unit>
FIG. 5 is a diagram exemplifying various information stored in a storage unit such as the HDD 14 or the RAM 13. As shown in FIG. The storage unit stores load information 50, biological information 51, state information 52, person-in-bed information 53, urgency information 54, care record information 55, display setting information 56, and the like together with the control program described above.

The load information 50 is information representing the load detection signal acquired by the load information acquisition section 30 . The biometric information 51 is information acquired by the biometric information acquisition unit 32 . Changes in the biological information 51 along the time axis indicate changes in the condition of the person in bed.

The state information 52 is information indicating the current state of the person P determined by the state determination unit 31 . A change in the state information 52 along the time axis indicates a change in the state of the person P in bed.

The person-in-bed information 53 is personal information including information such as the name, identification number (ID), necessity of nursing care, level of care required, etc. of each person P in bed.

The urgency level information 54 is information representing the urgency level (normal, caution, warning) according to the current state of the person P determined by the state determination unit 31 . The urgency information 54 also includes information indicating the risk of pressure ulcer occurrence determined by the pressure ulcer determination unit 36 .

The nursing care record information 55 is information representing a nursing care record such as postural changes performed on the bed person P by a caregiver or the like.

The load information 50, the biological information 51, the state information 52, the bed person information 53, the urgency information 54, and the care record information 55 are stored in association with the bed person P, respectively.

The display setting information 56 is setting information of a display form for displaying a list image of a plurality of persons P in bed. This display form is a default or preset by the operator. For example, there is a display mode in which the names of persons P in bed are listed in alphabetical order, and a display mode in which a list is displayed in order of urgency.

<Display operation of list image and detailed information>
FIG. 6 is a flow chart for explaining the display operation in the status display system 100. As shown in FIG. The operation of displaying a list image and detailed information of the states of a plurality of persons P in bed will be described along the flowchart of FIG.

First, the CPU 11 of the arithmetic unit 1 sequentially executes each process from step S1 based on the control program stored in the HDD 14. FIG. In step S 1 , the load information acquisition unit 30 acquires load information 50 from the load sensors 2 a to 2 d, and the biological information acquisition unit 32 acquires biological information 51 from the vital sensor 19 . The acquired load information 50 and biological information 51 are recorded in a storage unit such as the HDD 14 by the storage control unit 33 .

In step S<b>2 , based on the load information 50 , the state determination unit 31 determines the current state of each person P on the bed 4 , such as the position and posture. The state information 52 representing the determined state is recorded in the storage section by the storage control section 33 .

Here, for example, regarding the state of the person P in bed, the possibility of the person P falling from the bed 4 is "normal" that there is no possibility of falling from the bed 4, and the state is "caution" that there is a possibility of falling from the bed 4. , "warning" that there is a high probability of falling off the bed 4.

In step S3, the display control unit 37 generates a list image of objects of each person P based on the state information 52 of each person P stored in the storage unit, and displays it on the display screen of the display device 3. to display.

In step S4, it is determined whether or not the load information acquisition unit 30 and the biological information acquisition unit 32 have acquired the above information. If new information has been acquired (Yes determination), the process proceeds to step S5. . The load information acquisition unit 30 and the biological information acquisition unit 32 acquire new information at predetermined time intervals or randomly (irregularly). The acquired new information is recorded in the storage unit by the storage control unit 33 . As a result, current and past load information 50 and biological information 51 are recorded for each person P in bed in the storage unit.

In step S<b>5 , the state determination unit 31 performs state determination similar to step S<b>2 and generates state information 52 . This state information 52 is recorded in the storage unit by the storage control unit 33 as current state information. As a result, new and old state information 52 is recorded for each person P in bed in the storage unit.

In step S6, the state change detection unit 34 compares the new and old state information 52 (and the biological information 51) to detect a change in the state of the person in bed P. If there is a change in the state (Yes determination), the process proceeds to step S7, and when there is no change in the state (No determination), the process proceeds to step S8.

In step S7, the display control unit 37 changes the display form of the object of the person P whose state has changed in the list image.

In step S8, the operation detection unit 39 determines whether or not there is an operation to display detailed information. Specifically, the operator selects the object of the desired person P in bed from the list image of the object of each person P, thereby specifying the display of detailed information, and whether or not this designation operation is performed. is determined by the operation detection unit 39 . If the operation detection unit 39 does not detect the detailed information display operation (step S8: No), the process returns to step S3, and the list image display is continued.

On the other hand, when the operation detection unit 39 detects the detailed information display operation (step S8: Yes), the display control unit 37 displays the detailed information of the person P specified by the operator. .

After that, the display control unit 37 counts the time that has elapsed since the detailed information was displayed (step S10), and when a predetermined time such as 60 seconds has elapsed (timeout) (Yes determination), the detailed information is displayed. When finished, the process returns to step S3. It should be noted that even if the operation detection unit 39 detects the end operation before timeout, the display of the detailed information is ended, and the process returns to step S3.

<Display example of list image>
FIG. 7 is a diagram showing a display example of a list image. As shown in FIG. 7, the display control unit 37 displays information indicating the name of the person P and the position (or posture) of the person P using the state of each person P as an object. Furthermore, in the object, information indicating the current state and the past state are displayed in an overlapping manner.

FIG. 7 is an example of displaying a list of objects of a total of 20 people P in bed in 5 rows and 4 columns. In each object, the current state of person P in bed is represented by an icon. The background color of an object is the color that corresponds to its current state. The color of the oblong oval marker in the object is the color corresponding to the past (for example, 10 minutes ago) state.

<Explanation of icons>
FIG. 8 is a diagram showing an example of icons used according to the current state of person P in bed. As shown in FIG. 8, when the bed occupant P does not move and the position of the bed occupant P on the bed 4 is in the center, the background is white and the pattern of a person lying in the center of the bed is " An icon with the words "Rest" is used.

When the person P in bed is in a state of getting up from the bed 4, an icon with a white background and a picture of a person getting up from the bed with the characters "getting up" is used.

When the person P is sitting on the bed 4, an icon with a white background and a picture of a person sitting on the bed with the characters "sitting on the edge" is used.

When the state of the person P in bed is "normal", a "white" background is used as described above. That is, even when the person P is at rest without body movement, if the position of the person P on the bed 4 is at the left end, the background is yellow and the person is lying on the left end of the bed. An icon is used in which the letters "left end rest" are displayed.

Similarly, even when the person P is not moving and is resting, if the position of the person P on the bed 4 is at the right end, the background is yellow and the pattern of a person lying on the right end of the bed is displayed. , an icon with the characters “right end rest” is used.

If the position of the person in bed 4 on the bed 4 is in the center but there is body movement, the background is yellow and the picture of a person sleeping with body movement in the center of the bed is displayed with the message "Central body movement". Icons with characters are used.

When the bed occupant P is away from the bed 4 (not sleeping on the bed 4), an icon with a white background and a rectangular frame with characters "leave bed" is used.

Furthermore, when the state of the person P in bed is "warning", a "red (indicated by solid black)" background is used. That is, when the position of the person P on the bed is at the left end and there is body movement, the background is red, and the left end of the bed is a picture of a person sleeping with body movement, and the image of "left end with body movement" is displayed. Icons with characters are used.

When the position of the person P on the bed 4 is at the right end and there is body movement, the background is red, and the character "Right end with body movement" is a picture of a person sleeping with body movement at the right end of the bed. icon is used.

When the communication between the load sensors 2a to 2d and the arithmetic unit 1 is disconnected, a gray background (indicated by diagonal lines on the right) is used, and the connector is obliquely cut, and the word "disconnected" is displayed. icon is used. In addition, when the person P is absent, such as when the person P is temporarily returning home, a white background is used and an icon of characters "absent" is used.

In this way, by displaying the status of the person P in bed as a list image of the person P, and by making the background colors of the icons and objects correspond to the status of the person P in bed, nurses and caregivers can It is possible to accurately grasp the current state and state change of the person P in bed at a glance.

<Details of Posture Changer>
Next, a more detailed configuration and operation of the postural change detection unit 35 will be described.

FIG. 9 is a block diagram illustrating the configuration of the postural change detection unit 35. As shown in FIG. As shown in FIG. 9 , the postural change detection section 35 includes a vibration detection section 60 , a total load calculation section 61 and a determination section 62 .

The vibration detection unit 60 detects vibrations of the bed 4 based on the load information (load detection signals) that the load information acquisition unit 30 acquires from the load sensors 2a to 2d. The vibration detection unit 60 detects small vibrations caused by the person P on the bed 4, such as pulsation, respiration, slight movement, movement of limbs, and the like. For this reason, the vibration detection unit 60 uses load information obtained by integrating load detection signals obtained from the four load sensors 2a to 2d, and detects minute vibrations based on signals from which low frequency components have been removed by a bandpass filter or the like. preferably.

The total load calculator 61 calculates the total load including the bed 4 and the person P by, for example, summing the load detection signals obtained from the load sensors 2a to 2d. The total load information calculated by the total load calculation unit 61 is used to detect changes in the total load due to the load applied to the bed 4 by the caregiver when the caregiver changes the position of the person P in bed.

A vibration detector 60 and a total load calculator 61 obtain vibration and total load at predetermined time intervals. These vibration information and total load information are recorded in the aforementioned storage unit as time-series data and supplied to the determination unit 62 .

The determination unit 62 determines whether or not there is a postural change by performing a comparison determination of comparing the amplitude of vibration with a predetermined threshold value and a comparison determination of comparing the total load with a predetermined reference value.

FIG. 10 is a graph illustrating temporal changes in vibration information and total load information. As shown in FIG. 10A, when the person P is on the bed 4, the vibration information includes minute vibrations caused by the person P's pulsation, respiration, slight movement, movement of limbs, and the like. and the amplitude of the vibration is greater than or equal to the threshold.

On the other hand, when the person P in bed is away from the bed 4, the amplitude of vibration is less than the threshold. This threshold value needs to be set to a value that can determine whether or not the person P is present on the bed 4 . The threshold may be set to a different value for each person P in bed.

As shown in FIG. 10(B), when the caregiver changes the position of the person P in bed, the load is applied to the bed 4 by the caregiver, and the total load increases and becomes equal to or greater than the reference value. . Then, when the body position change is completed, the caregiver no longer applies the load, so the total load decreases and becomes equal to or less than the reference value. This reference value should be set to a value that allows determination of an increase in total load due to caregiver loading. This reference value is preferably set for each person P in bed according to the weight of the person P in bed.

<Posture change detection flow>
FIG. 11 is a flowchart for explaining postural change detection processing by the postural change detection unit 35 . Posture change detection processing by the posture change detection unit 35 is performed in parallel with the operation shown in FIG.

Posture change detection unit 35 sequentially executes each process from step S20 based on the control program. In step S<b>20 , the determination unit 62 acquires vibration information detected by the vibration detection unit 60 . In step S21, the determination unit 62 determines whether or not the amplitude of vibration is greater than or equal to the threshold value based on the vibration information, and if the amplitude is greater than or equal to the threshold value (Yes determination), the process proceeds to step S22. On the other hand, when determining in step S21 that the amplitude of vibration is less than the threshold value (No determination), the determination unit 62 returns the process to step S21.

In step S<b>22 , the determination section 62 acquires the total load information calculated by the total load calculation section 61 . In step S23, the determination unit 62 determines whether or not the total load is equal to or greater than the reference value based on the total load information, and if the total load is equal to or greater than the reference value (Yes determination), the process proceeds to step S24. On the other hand, when determining in step S23 that the total load information is less than the reference value (No determination), the determination unit 62 returns the process to step S21.

In step S<b>24 , the determination unit 62 determines that the position has been changed (posture has been changed), and supplies this determination result to the pressure ulcer determination unit 36 . Further, the determination result is recorded in the storage unit as nursing care record information 55 by the storage control unit 33 in association with the time.

<Pressure ulcer determination flow>
FIG. 12 is a flowchart for explaining the pressure ulcer risk determination process by the pressure ulcer determining unit 36 . The pressure ulcer risk determination process by the pressure ulcer determination unit 36 is performed in cooperation with the position change detection process by the position change detection unit 35 .

The pressure ulcer determination unit 36 sequentially executes each process from step S30 based on the control program. In step S30, the pressure ulcer determination unit 36 determines whether or not the position change detection unit 35 has determined that the position has been changed (Yes in step S24). Move to S31.

In step S31, the pressure ulcer determination unit 36 starts a timer. In step S32, the pressure ulcer determination unit 36 determines whether or not a predetermined time (warning time) has elapsed, and if the predetermined time has elapsed (Yes determination), the process proceeds to step S33.

In step S33, the pressure ulcer determination unit 36 issues a warning that the risk of pressure ulcer development has increased. Specifically, for example, the icon in the object of the person P in the bed in the above-mentioned list image is changed to "bed sore", or the speaker unit 20 emits a warning sound or voice to issue a warning. The caregiver can change the position of the target person P in bed according to this warning notification.

In step S34, the pressure ulcer determination unit 36 determines whether or not there has been a change in posture by the same processing as in step S30. continue. On the other hand, if the pressure ulcer determination unit 36 determines in step S34 that there has been a change in posture (Yes determination), the process proceeds to step S35 and cancels the warning notification.

Then, in step S36, the pressure ulcer determination unit 36 resets the timer, returns the process to step S31, and starts the timer again.

FIG. 13 is a diagram exemplifying a warning time setting table. The setting table TB shown in FIG. 13 is stored, for example, in the storage unit. The warning time in the setting table TB is used by the pressure ulcer determining unit 36 as the predetermined time in step S32 described above.

The setting table TB associates the health condition of the person P in bed with the warning time. Health conditions include, for example, nutritional conditions, blood circulation conditions, and skin conditions. Information about these health conditions is included in the care record information 55, for example.

The pressure ulcer determination unit 36 refers to the care record information 55 and sets the warning time for each person P based on the setting table TB. "X" in the setting table TB indicates that the condition is bad, and "O" indicates that the condition is good. Therefore, the worse the health condition of the person P in bed and the higher the risk of developing a pressure ulcer, the shorter the warning time is used for determination. As a result, the worse the health condition of the person P in bed and the higher the risk of developing a pressure ulcer, the shorter the time required for the warning to be issued.

Note that the items and numbers in the setting table TB may be changed as appropriate. For example, as shown in FIG. 14, the need for nursing care and the nursing care level of the person in bed P included in the person-in-bed information 53 may be associated with the warning time. In the setting table TB shown in FIG. 14, the warning time is shortened as the person P in bed is a person requiring care and the level of care is higher.

Also, it is preferable that the operator can edit the setting table TB using the operation unit 18 .

<Display example of care record information>
FIG. 15 is a diagram showing a display example of the care record information 55. As shown in FIG. For example, the nursing care record information 55 is displayed on the display screen of the display device 3 when the operator selects an object in the list image shown in FIG. The display control unit 37 performs display control of the nursing care record information 55 based on the detection signal from the operation detection unit 39 and the display setting information 56 .

As shown in FIG. 15, for example, in the display image of the care record information 55, care content and time are associated with each person P in bed and displayed. Posture change is automatically recorded in the care record information 55 by the posture change detection unit 35 when the posture change detection unit 35 detects the posture change, as described above.

The contents of nursing care and time can be edited by the operator using the operation unit 18 . Editing by the operation unit 18 includes not only changing the details of nursing care and time, but also deleting specific records in the nursing care record information 55 and adding records. When the postural change record is edited, the pressure ulcer determining unit 36 preferably performs the above-described elapsed time determination (step S32 in FIG. 12) starting from the time after editing.

<effect>
According to the above embodiment, as shown in FIG. 11, when the vibration of the bed 4 is equal to or greater than the threshold value and the total load amount is equal to or greater than the reference value, it is determined that there is a position change. The presence or absence of postural change can be detected with high accuracy. For example, when an object or the like is placed on the bed 4 while the person P is not present on the bed 4, even if the total load exceeds the reference value, no vibration is detected. never detected.

[Modification]
A modified example of detection processing for more accurately detecting the presence or absence of a postural change will be described below.

<First modification>
FIG. 16 is a flowchart for explaining postural change detection processing according to the first modification. The flowchart shown in FIG. 16 differs from the flowchart shown in FIG. 11 only in that a new step S40 is included between steps S23 and S24.

In this modification, after determining that the total load is equal to or greater than the reference value in step S23, the determination unit 62 shifts the process to step S40 to determine whether the total load has become less than the reference value within a certain period of time. judge.

If the determination unit 62 determines that the total load has become less than the reference value within the fixed period (Yes determination), the process proceeds to step S24, and determines that there has been a change in posture. On the other hand, when determining that the total load has not become less than the reference value within the fixed period (No determination), the determination unit 62 returns the process to step S21.

As shown in FIG. 10, when the caregiver changes the position of the person P in bed, the total load increases due to the addition of the load by the caregiver during the change of position. decreases. On the other hand, when an object or the like is placed on the bed 4 while the person P is not present on the bed 4, the state in which the total load is increased continues for a certain period of time or more.

As described above, in this modified example, by detecting a change in the total load that occurs after the total load reaches or exceeds the reference value, it is possible to detect the presence or absence of a postural change with higher accuracy.

It should be noted that the certain period of time may be appropriately changed in consideration of the characteristics of postural changes performed by the caregiver. It is preferable that the setting of the certain period of time can be changed by the operation unit 18 .

<Second modification>
FIG. 17 is a block diagram showing the configuration of a postural change detection section 35a according to the second modification. In this embodiment, the postural change detector 35 a has a pattern detector 63 in addition to the vibration detector 60 , the total load calculator 61 , and the determiner 62 .

FIG. 18 is a flowchart for explaining postural change detection processing according to the second modification. The flowchart shown in FIG. 18 differs from the flowchart shown in FIG. 11 only in that new steps S50 and S51 are provided between steps S23 and S24.

The pattern detection unit 63 performs pattern detection after the determination unit 62 determines that the total load is equal to or greater than the reference value. Specifically, the pattern detection unit 63 identifies the position of the center of gravity of the load based on the load information (load detection signals) that the load information acquisition unit 30 acquires from the load sensors 2a to 2d, and the center of gravity moves during the body position change. Detects trajectory patterns that

Calculation of the center-of-gravity position by the pattern detection unit 63 is performed by the following calculation. The coordinates of the load sensors 2a to 2d are (Xa, Ya), (Xb, Yb), (Xc, Yc), (Xd, Yd) respectively, and the load detection values of the load sensors 2a to 2d are Wa, Wb, Wc, respectively. Wd, the center-of-gravity position G (X, Y) is calculated by the following equations (1) and (2).

X=(Xa×Wa+Xb×Wb+Xc×Wc+Xd×Wd)/Ws (1)
Y=(Ya×Wa+Yb×Wb+Yc×Wc+Yd×Wd)/Ws (2)
Here, Ws represents the total load and is represented by Ws=Wa+Wb+Wc+Wd.

The pattern detection unit 63 calculates the center-of-gravity position G (X, Y) at predetermined time intervals, thereby obtaining the center-of-gravity trajectory TR (the center-of-gravity movement pattern) as shown in FIG. 19 . The storage control unit 33 records the trajectory TR detected by the pattern detection unit 63 as the pattern information 57 in the storage unit. Since this center-of-gravity movement pattern reflects an individual difference when a caregiver changes the position of the person P in bed, it is preferable to record it separately for each caregiver.

Further, as shown in FIG. 19, the area of the bed 4 may be divided into a plurality of areas (four areas in FIG. 19), and the change (order) of the area where the center of gravity exists may be recorded as the movement pattern of the center of gravity.

In this modification, as shown in FIG. 18, after the determination unit 62 determines that the total load is equal to or greater than the reference value in step S23, the process proceeds to step S50, and the pattern detection unit 63 detects the above-described A trajectory TR (center-of-gravity movement pattern) of the center of gravity is detected.

In step S51, the determination unit 62 determines whether or not the center-of-gravity movement pattern detected in step S50 matches the pattern included in the pattern information 57 recorded in the storage unit in the past. If the patterns match (Yes determination), the determination unit 62 moves the process to step S24 and determines that there has been a change in posture. On the other hand, if the patterns do not match (No determination), the determination unit 62 returns the process to step S21.

As described above, in this modified example, after the total load becomes equal to or greater than the reference value, the center-of-gravity movement pattern is detected, and it is determined whether or not it is a predetermined pattern. A certain thing can be detected with high accuracy.

Note that it is also preferable to enable editing and registration of the pattern information 57 using the operation unit 18 .

In the above embodiments and modifications, the status display system 100 has four load sensors 2a to 2d, but the number of load sensors is not limited to this and can be changed as appropriate. Any load sensor may be used as long as it can detect the load applied to the bed.

Moreover, the present invention is not limited to the requirements shown in the above embodiments. These points can be changed within the scope of the present invention, and can be determined appropriately according to the application form.

1 Arithmetic device 2a-2d Load sensor 3 Display device 4 Bed 5a-5d Caster 18 Operation unit 30 Load information acquisition unit 31 State determination unit 32 Biological information acquisition unit 33 Storage control unit 34 State change detection unit 35, 35a Posture change detection unit 36 pressure ulcer determination unit 37 display control unit 38 notification control unit 60 vibration detection unit 61 total load calculation unit 62 determination unit 63 pattern detection unit 100 state display system

Patent No. 5593746 Patent No. 4829020 Patent No. 4002905

Claims (14)

a plurality of load sensors that detect the load applied to the bed;
a vibration detection unit that detects vibration based on the outputs of the plurality of load sensors;
a total load calculation unit that calculates a total load based on the outputs of the plurality of load sensors;
The amplitude of the vibration detected by the vibration detection unit is equal to or greater than a threshold, the total load calculated by the total load calculation unit is equal to or greater than a reference value, and after the total load becomes equal to or greater than the reference value a determination unit that determines that the person on the bed has changed their posture when the total load becomes less than the reference value within a certain period of time;
A state detection device. The state detection device according to claim 1, further comprising a pressure ulcer determination unit that determines that the risk of developing a pressure ulcer has increased when a predetermined period of time elapses during which the determination unit does not determine that the position change has occurred. The state detection device according to claim 2, further comprising a notification control unit that notifies the pressure ulcer occurrence risk. The state detection device according to claim 2 or 3, wherein the pressure ulcer determination unit changes the predetermined time according to care record information of a person on the bed. The state detection device according to claim 2 or 3, wherein the pressure ulcer determination unit changes the predetermined time according to the care level of the person on the bed. 2. The state detection device according to claim 1, further comprising a storage control section that records a determination result in a storage section as nursing care record information when the determination section determines that the posture change has occurred. 7. The state detection device according to claim 6, further comprising an operation unit that enables editing of the care record information. a pattern detection unit that detects a pattern of movement of the center of gravity of the load based on the outputs of the plurality of load sensors after the determination unit determines that the total load is equal to or greater than the reference value;
The state detection device according to any one of claims 1 to 7, wherein the determination unit determines that the body position has been changed when the center-of-gravity movement pattern detected by the pattern detection unit is a predetermined pattern. The state detection device according to any one of claims 1 to 8, wherein the load sensors are arranged under a plurality of legs of the bed. a vibration detection step of detecting vibrations occurring in the bed based on the outputs of the plurality of load sensors;
a total load calculation step of calculating a total load applied to the bed based on the outputs of the plurality of load sensors;
When the amplitude of the vibration is equal to or greater than a threshold value, the total load is equal to or greater than a reference value, and the total load becomes less than the reference value within a certain period of time after the total load becomes equal to or greater than the reference value. a determination step of determining that there was a change in the position of the person in bed on the bed;
A state detection method comprising: Vibration detection processing for detecting vibrations occurring in the bed based on the outputs of a plurality of load sensors;
a total load calculation process for calculating a total load applied to the bed based on the outputs of the plurality of load sensors;
When the amplitude of the vibration is equal to or greater than a threshold value, the total load is equal to or greater than a reference value, and the total load becomes less than the reference value within a certain period of time after the total load becomes equal to or greater than the reference value. A determination process for determining that there was a position change of the person in bed on the bed;
A program that makes a computer run a plurality of load sensors that detect the load applied to the bed;
a vibration detection unit that detects vibration based on the outputs of the plurality of load sensors;
a total load calculation unit that calculates a total load based on the outputs of the plurality of load sensors;
When the amplitude of the vibration detected by the vibration detection unit is equal to or greater than a threshold value and the total load calculated by the total load calculation unit is equal to or greater than a reference value, the position of the person on the bed can be changed. a determination unit that determines that there is
a pressure ulcer determining unit that determines that the risk of developing a pressure ulcer has increased when a predetermined period of time elapses during which the determination unit does not determine that the position change has occurred;
has
The pressure ulcer determination unit is a state detection device that changes the predetermined time according to the care level of the person on the bed. a plurality of load sensors that detect the load applied to the bed;
a vibration detection unit that detects vibration based on the outputs of the plurality of load sensors;
a total load calculation unit that calculates a total load based on the outputs of the plurality of load sensors;
When the amplitude of the vibration detected by the vibration detection unit is equal to or greater than a threshold value and the total load calculated by the total load calculation unit is equal to or greater than a reference value, the position of the person on the bed can be changed. a determination unit that determines that there is
a pressure ulcer determining unit that determines that the risk of developing a pressure ulcer has increased when a predetermined period of time elapses during which the determination unit does not determine that the position change has occurred;
a notification control unit that notifies the pressure ulcer risk;
has
The pressure ulcer determination unit is a state detection device that changes the predetermined time according to the care level of the person on the bed. a plurality of load sensors that detect the load applied to the bed;
a vibration detection unit that detects vibration based on the outputs of the plurality of load sensors;
a total load calculation unit that calculates a total load based on the outputs of the plurality of load sensors;
When the amplitude of the vibration detected by the vibration detection unit is equal to or greater than a threshold value and the total load calculated by the total load calculation unit is equal to or greater than a reference value, the position of the person on the bed can be changed. a determination unit that determines that there is
has
a pattern detection unit that detects a pattern of movement of the center of gravity of the load based on the outputs of the plurality of load sensors after the determination unit determines that the total load is equal to or greater than the reference value;
The determination unit determines that the body position has been changed when the center-of-gravity movement pattern detected by the pattern detection unit is a predetermined pattern .

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