JP6328884B2 - Body movement level determination device - Google Patents

Description

  The present invention relates to a body movement level determination device that determines a body movement level of a user such as a patient on a bed.

  In recent years, in medical institutions, nursing homes, homes, etc., it has been known to measure and monitor the bed and bed movements and body movements of users (patients, elderly people, infants, etc.) who are lying on the bed. It has been.

  For example, by detecting the load from the load sensors provided in a plurality of places on the bed bed, and measuring the bed situation and body movement state of the user of the bed based on the detection values from these load sensors, What notifies the result of having measured with respect to the supervisor who monitors a user is known (refer patent documents 1 and 2).

JP 2000-316915 A JP 2010-88473 A

  However, in the conventional method for monitoring the user on the bed, the body movement is evaluated to be small depending on the weight of the user, and there is room for improvement in the determination of the body movement level.

  An object of the present invention is, for example, to provide a body motion level determination device and a body motion level determination method that can determine a body motion level of a user with high accuracy.

  That is, this invention has the structure as described in following [1]-[7].

[1] A load obtained for each first predetermined period based on a load change amount for a predetermined time of a detection value from a load sensor that detects a load applied to a plurality of parts provided on the bed part apart from each other. First determination means for determining whether the total amount of change exceeds a threshold;
Based on the detection value from the load sensor, movement start determination means for determining whether or not the user on the bed has started moving,
Second determination means for stepwise determining a user's body movement level based on the determination result of the movement start determination means and the determination result of the first determination means;
A body movement level determination device comprising:

  [2] The preceding item, wherein the first determining means determines the body movement state of the user stepwise based on whether or not the total amount of load change exceeds a plurality of threshold values set in plurality. 1. The body movement level determination device according to 1.

[3] The second determination means determines the body movement level of the user every second predetermined period,
If the determination result of the first determination means is a determination result that the user's body movement state is small, and the movement start determination means determines that the user has started moving, the first determination means of the first determination means 3. The body movement level determination device according to item 2, wherein the body movement level is determined to be greater than the determination result.

  [4] The body movement level determination device according to any one of the preceding items 1 to 3, wherein the load sensor is provided at one location on each side of the head side and one location on the left and right sides of the foot portion.

  [5] The body movement level determination device according to any one of the preceding items 1 to 4, further comprising a display unit that displays a determination result determined by the second determination unit.

[6] The body movement level determination device according to any one of 1 to 5 above,
A load sensor for detecting a load applied to a plurality of parts provided apart from each other in the bed part;
A body movement level determination system comprising:

[7] A load change obtained for each first predetermined period based on a load change amount for a predetermined time of a detection value from a load sensor that detects loads applied to a plurality of parts provided at a distance from each other in the bed part. A first determination step of determining whether the total amount exceeds a threshold;
Based on a detection value from the load sensor, a movement start determination step for determining whether or not the user on the bed has started moving;
A second determination step for stepwise determining a user's body movement level based on the determination result of the movement start determination step and the determination result of the first determination step;
A body movement level determination method characterized by comprising:

According to the invention described in [1] above, based on each load change amount for a predetermined time of a detection value from a load sensor that detects a load applied to a plurality of parts provided apart from each other in the bed part. 1st determination means for determining whether or not the total amount of load change obtained every predetermined period exceeds a threshold value, and whether or not the user on the bed has started to move based on the detection value from the load sensor. For example, there is provided a movement start determination means for determining, and a second determination means for stepwise determining the body movement level of the user based on the determination result of the movement start determination means and the determination result of the first determination means. If the user is lightweight, a change in the weight of the user may greatly affect the result of the load change, for example, even if you roll over, the change in the load will not be significantly affected. Movements that are only slightly affected by differences The determination result of determination is, by the judgment result in consideration has been motion level of the first determination is determined, can be affected by difference in body weight is reduced, to determine the body movement level with high accuracy.

  Further, by accumulating the amount of change in load, it is possible to grasp the amount of movement of the bed user and easily determine the body movement state.

  According to the invention described in [2] above, the first determination means determines the body movement state of the user stepwise based on whether or not the total amount of load change exceeds a plurality of set threshold values. Therefore, the state of the user's body movement can be determined in a plurality of stages according to the threshold value, and the body movement level is expressed in stages, so that the accuracy of the body movement level determination is further improved.

  According to the invention described in [3] above, the second determination means determines the body movement level of the user every second predetermined period, and the determination result of the first determination means indicates that the body movement state of the user is If the result of the determination is small, and it is determined that the user has started to move by the movement determination means, it is determined that the body movement level is higher than the determination result of the first determination means. Among the results, the determination result of the movement start determination is added to only the determination result that is easily influenced by the difference in the weight of the user, and the accuracy of the body movement level determination is further improved.

  In addition, since the body movement level is determined every second predetermined period, even if the user has a large or small body movement, the determination result of the body movement level is frequently changed according to the intense body movement level change of the user. Therefore, a stable determination result can be obtained.

  According to the invention described in [4] above, since the load sensors are provided one on each of the left and right sides on the head side and one on each of the left and right sides of the foot side, they are separated from each other on the head side and the foot side. A total of four loads on the left and right sides are respectively detected and the body movement level can be determined, and the load change of the entire bed can be accurately detected.

  According to the invention described in [5] above, since the display unit that displays the determination result determined by the second determination unit is provided, the body movement level of the user on the bed is displayed, so that the bed unit A supervisor (for example, a caregiver, a caregiver, etc.) checking the body movement status of the above user can easily know the body movement level of the user.

  According to the invention described in [6] above, the body movement level determination device according to any one of the preceding items 1 to 5, and a load sensor that detects loads applied to a plurality of parts of the bed part that are provided apart from each other. Therefore, the same effects as the effects of the above [1] to [5] can be obtained.

According to the invention described in [7] above, based on the load change amount of the detection value from the load sensor that detects the load applied to the plurality of parts provided apart from each other in the bed portion for a predetermined time, the first A first determination step for determining whether or not the total amount of load change obtained every predetermined period exceeds a threshold value, and whether or not the user on the bed has started moving based on a detection value from the load sensor And a second determination step for stepwise determining the body movement level of the user based on the determination result of the movement determination step and the determination result of the first determination step. If the user is lightweight, a change in the weight of the user may greatly affect the result of the load change, for example, even if you roll over, the change in the load will not be significantly affected. Shadow by difference The determination result of start moving determination is negligible, by the judgment result is taken into consideration in the motion level of the first determination is determined to improve the accuracy of the eliminated body movement level determination is affected by the difference in body weight.

  Further, by accumulating the amount of change in load, it is possible to grasp the amount of movement of the bed user and easily determine the body movement state.

It is the schematic for demonstrating the body movement level determination apparatus which concerns on one Embodiment of this invention. It is a schematic plan view of a bed. It is a schematic block diagram of the body movement level determination apparatus according to the present invention. It is a flowchart which shows the basic operation | movement of the body movement level determination apparatus which concerns on this invention. It is a flowchart which shows the body movement state determination which the control part of the body movement level determination apparatus which concerns on this invention performs. It is a flowchart which shows the body movement level determination which the control part of the body movement level determination apparatus which concerns on this invention performs. It is explanatory drawing for demonstrating an example of the determination result of the body movement level determination by the body movement level determination apparatus which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram for explaining the body movement level determination device 100, FIG. 2 is a schematic plan view of the bed 9, FIG. 3 is a schematic block diagram of the body movement level determination device 100, and FIG. 5 is a flowchart showing the basic operation of the level determining device 100, FIG. 5 is a flowchart showing the body motion state determination executed by the control unit 1 of the body motion level determining device 100, and FIG. 6 is a control unit 1 of the body motion level determining device 100. FIG. 7 is an explanatory diagram for explaining an example of the determination result of the body motion level determination by the body motion level determination device 100. FIG.

  As shown in FIGS. 1 and 2, for example, the bed 9 includes a bed portion 91, a frame 92 that supports the bed portion 91, and leg portions 93 (931, 932, 933, and 934) at the lower corners of the frame 92. The lower end portion of the leg portion 93 is provided with a caster 94.

  A load sensor 8 (81, 82, 83, 84) is provided below each caster 94 of the leg portion 93 of the bed 9, and the load sensor 8 is on the head side of the user H lying on the bed portion 91. The change in the load applied to the bed portion 91 is detected at a total of four locations, one on each of the left and right sides (81, 82) and one on the left and right sides of the foot (83, 84).

  The load sensor 8 is configured such that the detected load of the bed portion 91 is converted into a load signal, and the load signal is input to the body movement level determination device 100 via a signal line.

  For example, a load cell, a strain sensor, an accelerometer, or the like is used as the load sensor 8.

  The body movement level determination device 100 is a device for detecting the body movement level of the user H of the bed part 91 of the bed 9 and detects loads applied to a plurality of parts of the bed part 91 provided apart from each other. Control unit 1 that calculates based on the detection value from the load sensor 8 (81, 82, 83, 84) to be performed, the display unit 2 that visually notifies the calculation result of the control unit 1, and the calculation of the control unit 1 The sound output part 3 etc. which alert | report the result etc. auditorily are provided.

  The control unit 1 includes a CPU 11, a storage unit 11 including a storage medium such as a ROM storing a program and data executed by the CPU, and a RAM used as a working area, and a control from a sensor or the like via a signal line. An input / output unit 12 for inputting a signal or outputting a control signal through a signal line, and a communication interface 13 for inputting / outputting control data to / from the display unit 2 and the sound output unit 3 through a data bus. (Hereinafter referred to as “communication I / F 13”).

  In addition to the ROM and RAM, a flash memory or the like may be used as a storage medium constituting the storage unit 11, or a storage device such as an HDD or the like may be used in addition to the semiconductor memory. Alternatively, an external memory such as an SD memory card may be used.

  The control unit 1 performs a calculation based on the detection value from each load sensor 8 (81, 82, 83, 84) input via the input / output unit 12, and stores the calculation result in the storage unit 11. Based on the calculation result stored in the storage unit 11, notification information regarding the body movement level of the user H of the bed 91 is generated.

  The control unit 1 outputs the notification information to the display unit 2 and the sound output unit 3 via the communication I / F 13.

  The display unit 2 is configured to include, for example, a liquid crystal display device, and outputs a display based on notification information received from the control unit 1 via the communication I / F 13.

  The sound output unit 3 includes, for example, a speaker and outputs the speaker based on the notification information received from the control unit 1 via the communication I / F 13.

  Display data generated by the control unit 1 is input to the display unit 2 as notification information and displayed on the liquid crystal display device as an image indicating the body movement level of the user H. The sound output unit 3 includes the control unit The sound output data generated in 1 is input as notification information and output from the speaker as an alarm sound indicating the body movement level of the user H of the bed portion 91.

  The display unit 2 and the sound output unit 3 may be configured so that the body movement level of the user H is input from the control unit 1 and converted into data suitable for notification by each unit. .

  In combination with the display unit 2 and the sound output unit 3, the control unit 1 is installed in a place suitable for monitoring by a supervisor, for example, a nurse station if it is a hospital or a clinic, and is attached to each leg 93 of the bed 9. A load signal is input from the provided load sensor 8 through a signal line.

  The control unit 1 reads the detection values from all the load sensors 8 at a predetermined cycle (for example, 0.5 seconds, hereinafter referred to as “detection cycle”) by timer interrupt processing using an internal timer, and the like. The detected value is converted into a load value and stored in the storage unit 11.

  In other words, the load values applied to the four locations of the bed 9 are stored in the storage unit 11 for each detection cycle, and the control unit 1 determines the bed state of the bed 91 and the bed state based on these load values. The body movement level of the user H is determined.

  In addition, as a method for the control unit 1 to detect the detection value of the load sensor 8, not only the detection value is read by the timer interrupt processing by the internal timer as described above, but also a known technique is appropriately used. Design.

  For example, the control unit 1 has an input capture function, and is configured to be automatically transferred from the input capture register to a storage unit 11 via a DMAC (Direct Access Memory Controller) or the like to a predetermined address assigned in advance. This configuration is preferable because the control unit 1 only needs to refer to a predetermined address in the storage unit 11 at the interruption of a predetermined period, and the processing load on the control unit 1 is reduced.

  By configuring the load sensor 8 to be provided one on each of the left and right sides of the head side and one on the left and right sides of the foot side, a total of four left and right sides separated from each other on the head side and the foot side are provided. The load can be detected to determine the body movement level, and the load change of the entire bed 9 can be accurately detected.

  In the following, the control unit 1 performs a plurality of determinations such as the occupancy status and body movement state of the user H of the bed unit 91 at the timing of reading the detection value from the load sensor 8 in the detection cycle, and the bed unit The description will be made based on the case where the body movement level of the user H 91 is determined, that is, the body movement level is determined in real time.

  Hereinafter, based on the flowchart of FIG. 4, a plurality of determination processes will be described while describing a basic operation for determining a body movement level executed by the control unit 1.

  First, the control unit 1 performs bed rest determination that determines whether or not the user H is lying on the bed 91 based on the detection value from the load sensor 8 (FIG. 4, SA1).

In the bed determination, determination is made using the detection values output from the load sensors 8 to the body movement level determination device 100 converted into the load values RW ₁ , RW ₂ , LW ₁ , LW ₂ , respectively. The

Specifically, the total load value WT obtained by adding the four load values W (RW ₁ , RW ₂ , LW ₁ , LW ₂ ) detected from each load sensor 8 (81, 82, 83, 84) is calculated. The gravity center position G (GX, GY) of the user H on the bed 91 calculated based on each load value RW ₁ , RW ₂ , LW ₁ , LW ₂ is equal to or greater than a predetermined threshold value (for example, 20 kgf). ) Is not in the peripheral area of the bed 91, but in a predetermined central area (cross-hatched area shown in FIG. 2) 91a as a bed area, and the state continues for a predetermined time (for example, 5 seconds) or more. In this case, the control unit 1 determines that the user H is lying on the bed 91.

  The above-mentioned unit “kgf” means kilogram weight, and 1 kgf corresponds to 9.8N.

  When the center of gravity position G (GX, GY) of the user H is not in the predetermined central area 91a of the bed portion 91 of the bed 9, or when the state has not continued for a predetermined time or longer, the control unit 1 It is determined that the user H is not lying on the bed 91.

  The center-of-gravity position G (GX, GY) of the user H on the bed portion 91 is obtained by the following equation, for example.

  Note that O (0, 0) in FIG. 2 indicates the origin of the XY coordinates that define the gravity center position G.

GX = (LW ₁ + RW ₁ −LW ₂ −RW ₂ ) × (1 / WT) × (BX / 2) (1)
GY = (LW ₁ + LW ₂ −RW ₁ −RW ₂ ) × (1 / WT) × (BY / 2) (2)
BX: Distance between leg portions 93 in the longitudinal direction of the bed portion 91 BY: Distance between leg portions 93 in the short direction of the bed portion 91 WT = LW ₁ + RW ₁ + LW ₂ + RW ₂ (total load value obtained by adding each load value)
When it is determined that the user H is not lying on the bed 91 (FIG. 4, SA2, N), the bed determination is continuously performed until it is determined that the user H is lying. (FIG. 4, SA1).

  When it is determined that the user H is lying on the bed 91 (FIG. 4, SA2, Y), the control unit 1 uses the load on the bed 91 based on the load value W from the load sensor 8. The movement start determination for determining whether or not the person H has started moving is executed (FIG. 4, SA3).

  The control unit 1 functions as a movement start determination unit, and the determination result by the movement start determination is one of the determination materials for determining the body movement level of the user H described later.

  In the body movement level determination, since the determination is started from the body movement level determination start time that is a predetermined time (for example, one minute ago) after the time when it is determined that the user H has been bedded by the bed determination, the control unit 1 In the first execution of the movement start determination, the movement start determination is also performed for the period from the body movement level determination start time to the present.

For example, the control unit 1 sets the largest load value among the detected load values RW ₁ , RW ₂ , LW ₁ , and LW ₂ of the load sensor 8 to the “first determination reference value WS ₁ ” and the second largest value. The determination reference value WS is set with the load value as “second determination reference value WS ₂ ”, the load sensor 8 that has detected the first determination reference value is detected as “first determination reference sensor S ₁ ”, and the second determination reference value is detected. The determination reference sensor S is set with the load sensor 8 thus set as the “second determination reference sensor S ₂ ”.

The control unit 1 uses the first and second determination reference values WS ₁ and WS ₂ and the load values W from the first and second determination reference sensors S ₁ and S ₂ to perform the movement start determination.

Specifically, with respect to at least one determination reference sensor S of the first and second determination reference sensors S ₁ and S ₂ , the determination reference value WS corresponding to the determination reference sensor S that has detected the load value W to be determined is detected. If the load value fluctuation (load value fluctuation rate) continues beyond a predetermined range for a predetermined time (for example, 1 second to 5 seconds), the control unit 1 determines that the user H has started to move.

  The predetermined range is, for example, an upper limit value and a lower limit value of ± γ with respect to the determination reference value WS using a value γ arbitrarily set in a range of load value fluctuation of 5% to 50%. Range.

  If the load value variation with respect to the determination reference value WS is greater than or equal to the upper limit value or less than the lower limit value, the control unit 1 determines that the user H has started to move.

  Specifically, for example, when γ = 5 is set, the control unit 1 determines that the user H has started to move if the load value fluctuation with respect to the determination reference value WS is −5% or less or + 5% or more.

  Further, the control unit 1 determines that the load value variation does not satisfy the above-described condition, that is, the load value variation is within a predetermined range (for example, a range that is larger than −5% and smaller than + 5% when γ = 5). If the duration time in that state is less than a predetermined time (for example, 1 to 5 seconds) even if out of the predetermined range, it is determined that the user H has not started moving.

  It should be noted that the variation in the determination due to the weight of the user H can be minimized, and the determination accuracy of the movement start determination can be improved, so that the load value variation rate of the load value W with respect to the determination reference value WS as described above. It is preferable to set one of the determination conditions as to whether or not the value is within the predetermined range, but the target for determining whether or not the value is within the predetermined range may be the load value fluctuation amount with respect to the determination reference value WS.

  The determination result by the movement start determination obtained as described above is stored in the storage unit 11 by the control unit 1.

  In this case, if the second predetermined period T, which is a period in which the body movement level determination start time is set and the body movement level is determined, is set using, for example, a flag indicating the movement start state. When it is determined that the user H has started to move even once in the predetermined period T, a value indicating “being moved” may be set in the flag in the second predetermined period T.

  When it is determined that the user H has started to move even once in the second predetermined period T, the control unit 1 starts to move from the time when the flag is set to a value indicating “being moved” until the second predetermined period T ends. You may comprise so that determination may not be performed.

  Note that the movement start determination flow is not limited to the flow described above. For example, the determination reference sensor S is always optimal in consideration of the case where the largest load is applied to another load sensor 8 that is not set to the determination reference sensor S when the user H turns over. As set in the load sensor 8, it is configured to constantly monitor the variation of the load value W of each load sensor 8 (81, 82, 83, 84) and update the setting of the determination reference sensor S as needed. It may be.

  The control unit 1 starts executing the above-described movement start determination, and detects each load change amount of the detection value from the load sensor 8 for a predetermined time, for example, detection from each load sensor 8 (81, 82, 83, 84). Each load change total amount V for each first predetermined period is obtained based on each load change amount calculated from the value and the previous detected value, and it is determined whether or not the load change total amount V exceeds a threshold value. The body movement state determination is executed (FIG. 4, SA4).

  The control unit 1 functions as a first determination unit that determines the body movement state. In the body movement state determination, the body movement state of the user H on the bed 91 is determined, and the determination result obtained by the body movement state determination indicates that the movement has started. Together with the determination result, it becomes a determination material for determining the body movement level of the user H described later.

  In the first execution of the body movement state determination, similarly to the above-described movement start determination, the control unit 1 performs the body movement state determination for the period from the body movement level determination start time to the present time.

  In determining the body movement state, the control unit 1 detects the load value for each detection cycle of each load sensor 8 (81, 82, 83, 84) and, in this embodiment, 0.5 seconds before the detection. The difference from the previous load value is calculated as a load change amount, and the load change amount for each load sensor 8 is stored in the storage unit 11.

  Table 1 shows the load value for each detection cycle from each load sensor 8 (81, 82, 83, 84), and Table 2 shows the load value from the load sensor 8 and the previous load value. Each load change amount for each load sensor 8 is shown.

Based on Tables 1 and ₂ , the load value LW ₂ out of the load values RW ₁ , RW ₂ , LW ₁ , and LW ₂ from the load sensors 8 (81, 82, 83, 84) will be described. as shown in 1, the load value LW _2, for example, "17:08:55", "16.7", the load value LW ₂ of the next "17:08:56" has become "17.0" The change amount of these two load values is described as “0.3” in “17:08:56” of Table 2.

  Similarly, each load change amount for each detection cycle and each load sensor 8 (81, 82, 83, 84) is calculated.

  Next, the control unit 1 calculates a total load change amount V obtained by adding the load change amount obtained for each load sensor 8 and for each detection cycle for a first predetermined period (for example, 1 minute).

  Table 3 shows the load change total amount V obtained by adding the load change amounts obtained in Table 2 for the first predetermined period for each detection period.

  Explaining by taking Table 3 as an example, the control unit 1 includes, for example, the load change amount (see Table 2) obtained based on the load value detected at “17:08:55”. The total load change amount V is obtained by integrating the load change amounts for one minute (first predetermined period).

Control unit 1, thus the load change amount V obtained is determined whether exceeds the threshold value L _th, determines motion status of the user H on the bed portion 91.

In the present embodiment, the control unit 1 uses the two threshold values L _th of the first threshold value L _th1 and the second threshold value L _th2 , for example, to change the body movement state to “small”, “medium”, “ Judgment is made in three stages of “large”.

If the total load change amount V is smaller than the first threshold value L _th1, it is determined that the body movement state is “small” because the user H on the bed 91 moves the limbs slightly.

If the total load change amount V is _{equal to} or greater than the first threshold value L _{th1 and} smaller than the second threshold value L _th2, it is assumed that the body movement is such that the user H on the bed 91 is raising his back or turning over. The moving state is determined to be “medium”.

If the total load change amount V is equal to or greater than the second threshold value L _th2 , it is determined that the body motion state is “large” because the body motion is such that the user H on the bed 91 moves so as to flutter greatly. Is done.

  Below, based on the flowchart shown in FIG. 5, the body movement state determination which the control part 1 performs is demonstrated.

  In Tables 1 to 3, the data unit is described as “kgf” for the sake of explanation. However, in this embodiment, the control unit 1 uses a value obtained by multiplying each data value by 10 to facilitate calculation. An operation is performed.

The control unit 1 calculates the total load change amount V by integrating the load change amount for the first predetermined period (for example, 1 minute) (SB1), and the total load change amount V is the first threshold value L _th1 (for example, 1000 (= 100 kgf )) Is not exceeded (SB2).

If the total load change amount V is smaller than the first threshold value L _{th1 in} step SB2, the body movement state of the user H of the bed portion 91 is determined to be “small” (SB3).

In step SB2, if the total load change amount V is _{equal to} or greater than the first threshold value L _th1 , that is, if the total load change amount V exceeds the first threshold value L _th1 , the control unit 1 further sets the second threshold value L _th2 (for example, 2000 It is determined whether (= 200 kgf) is not exceeded (SB4).

If the total load change amount V is smaller than the second threshold value L _{th2 in} step SB4, the control unit 1 determines that the body movement state of the user H of the bed 91 is “medium” (SB5), and the load If the total change amount V is _{equal to} or greater than the second threshold value L _th2 , that is, if the total load change amount V exceeds the second threshold value L _{th 2} , the body movement state of the user H is determined to be “large” (SB6).

  When the body movement state is determined in Steps SB3, 5, and 6, the control unit 1 stores the determination result of the body movement state determination in the storage unit 11 (SB7).

  If the second predetermined period T, which is a period in which the body movement level determination start time is set and the body movement level is determined, is set, the control unit 1 uses the flag indicating the body movement state. The value indicating only the maximum body movement state determined in the second predetermined period T may be set in the flag.

  That is, the flag indicating the body movement state may be configured such that a value is always set to indicate the maximum body movement state based on the body movement state determination in the second predetermined period T.

  Furthermore, if it is determined that the body movement state is the maximum (in this embodiment, the body movement state is “large”), the body movement state determination is not performed periodically, but the body movement state is “ The controller 1 may be configured not to execute the body movement state determination from the time when the flag is set to a value indicating “large” until the second predetermined period T ends.

  With this configuration, the processing load on the control unit 1 is reduced.

As described above, based on whether or not the control unit 1 exceeds the respective threshold values L _th (two threshold values L _th1 and L _th2 in the above description) in which a plurality of load change total amounts V are set, the user H if configured to determine a body movement state stepwise, it can be determined in several stages in accordance with the body movement of the user state H to the threshold L _th, representing a body movement state in stages As a result, the accuracy of the body movement level determination is further improved.

  After executing the movement start determination and the body movement state determination, the control unit 1 determines the body movement level of the user H on the bed 91 based on the determination result of the movement start determination and the determination result of the body movement state determination. The body movement level determination is executed (FIG. 4, SA5).

The control unit 1 functions as a second determination unit that determines the body motion level, and is a second predetermined time from a body motion level determination start time (a time that is a predetermined time after the time when it is determined that the user H has been bedded by the bed determination). period (e.g., 5 _minutes) T _0, T _{1, T} 2 · · · every start moving determination of the determination result and to evaluate the determination results of the body movement state determination, the second predetermined time period _{T 0,} T 1, _{T 2} ... The body movement level of the user H is determined every time.

  The determination result of the body movement level determination is also determined by three levels of body movement levels, “small”, “medium”, and “large”, which are defined in the same manner as the body movement state.

  The control unit 1 determines the body movement level in consideration of the determination result of the movement start only when the body movement state is determined to be “small” in the determination result of the body movement state determination.

  In the determination result of the body movement state determination, when the body movement state is determined to be “medium” or “large”, the determination result of the movement start determination is not added, and the determination result of the body movement state determination is The determination result of the body movement level is used as it is.

  In the second predetermined period T, if the condition for determining that the body movement level is the maximum level at least once (in the present embodiment, the body movement level is “high”) is satisfied, the body movement level is maximum. The determination result when determined to be the level is configured to be maintained for the second predetermined period T.

  FIG. 7 is a diagram for explaining an example of the determination result of the body movement level determination by the body movement level determination apparatus 100, and the determination method of the body movement level determination will be described below based on this drawing.

  FIG. 7A shows a time series change of the load change total amount V in the body movement state determination in a scatter diagram, and FIG. 7B is the same as FIG. FIG. 7C shows the determination result of the movement start determination that has been executed, and FIG. 7C shows the determination of the body movement level determination derived based on both determination results shown in FIGS. 7A and 7B. The results are shown.

As shown in FIG. 7A, for example, in the second predetermined period T ₁ (17:05 to 17:10), the load change total amount V may have reached the second threshold value L _th2 , and the body movement state is It can be seen that there is a time point when it is determined as “large”.

The second predetermined period of time T _1, the load change amount V is, but not always exceeds the second threshold value L _th2, is determined in the second predetermined time period T _1, the body movement level is a "large" because it can satisfy the condition, the control unit 1 maintains the determination result motion level is determined to be the maximum level, the second predetermined period of time T _1, the body movement of the user H on the bed portion 91 The level is determined to be “large”.

Similarly, in the second predetermined period T ₃ (17:15 to 17:20), the total load change amount V does not exceed the second threshold value L _th2 but reaches the first threshold value L _th1 , and the body movement state is “ because it can satisfy the condition that is determined to be middle ", also a later body movement states have reduced body movement level of the user H on the bed portion 91 in the second predetermined period T ₃ is" medium Is determined.

  Below, based on the flowchart shown in FIG. 6, the body movement level determination which the control part 1 performs is demonstrated.

  If the monitoring time t has not reached the second predetermined period T (SC1, Y), the control unit 1 performs body movement level determination, and the body movement state of the user H of the bed 91 is determined by the body movement state determination. If it is determined as “small” (SC2, Y), the determination result of the movement start determination in the second predetermined period T stored in the storage unit 11 is referred to (SC3).

  In the movement start determination, if it is determined that the movement has started even once in the second predetermined period, it is determined that the user H has started moving in the second predetermined period.

  If it is determined in step SC2 that the body motion state of the user H of the bed 91 is other than “small” by the body motion state determination (SC2, N), the determination result of the body motion state determination is directly used as the body motion level determination. (SC6).

  If it is determined in step SC3 that the movement has started to be “present” in the movement determination in the second predetermined period T (SC3, Y), the control unit 1 temporarily determines that the body movement level is “medium” (SC4), If it is determined that there is no movement in the movement determination in the second predetermined period T (SC3, N), the control unit 1 temporarily determines that the body movement level is “small” (SC5).

  The first determination result (SC4 to SC6) of the body movement level determined based on the determination result of the body movement state determination and the determination result of the movement start as described above is a provisional determination result.

  When the determination result (body motion level) before the provisional determination result in the second predetermined period T is smaller than the body movement level in the provisional determination result, the provisional determination result is regarded as a true determination result. The provisional determination result is confirmed and updated as the determination result.

  On the other hand, if the determination result (body movement level) before the provisional determination result in the second predetermined period T is greater than the body movement level in the provisional determination result, the determination result before the provisional determination result is true. As a result, that is, the previous determination result is determined as the determination result.

  That is, in the present embodiment, when the determination result of the body movement state determination is “medium”, regardless of the determination result of the movement start determination in the second predetermined period T. , The body movement level is provisionally determined to be “medium”. If the body movement state of the user H is “large”, the body movement level is also provisionally determined to be “large”, and the body movement state of the user H is If it is determined to be other than “small”, the determination result of the body movement state determination is taken over by the provisional determination result of the body movement level determination.

  After the determination of the temporary body movement level of the user H by the current body movement level determination in Steps SC4 to SC6, the temporary body movement level by the current body movement level determination is the determination of the previous body movement level determination. If the body motion level is higher than the result (SC7, Y), the provisional body motion level by the current body motion level determination is determined as the body motion level by the current body motion level determination (SC8). The determined body movement level is stored in the storage unit 11 (SC10).

  In step SC7, if the temporary body motion level determined by the current body motion level determination is not a body motion level larger than the determination result of the previous body motion level determination (SC7, N), the previous body motion level is determined. The determination result is determined as the body motion level by the current body motion level determination (SC9), and the determined body motion level is stored in the storage unit 11 (SC10).

  The controller 1 repeats the body movement level determination flow shown in FIG. 6 until the second predetermined period T elapses.

  By the body movement level determination executed in this way, the latest bed presence state and body movement level of the bed 9 user H can be determined in real time.

As described above, the control unit 1 determines the body movement level of the user H every second predetermined period T ₀ , T ₁ , T ₂ ..., And the determination result of the first determination unit is the user H. If it is determined that the user's body movement state is small, if it is determined that the user has started to move, the body movement level is determined to be greater than the determination result of the first determination unit. Among the determination results of the movement state determination, the determination result of the movement start determination is added only to the determination result that is easily influenced by the difference in the weight of the user H, so that the accuracy of the body movement level determination is further improved.

  In addition, since the body movement level is determined every second predetermined period, even if the user H has a large or small body movement, the determination result of the body movement level in accordance with the intense body movement level change of the user H Therefore, a stable determination result can be obtained.

  As in the case of the above-described body movement state determination, when it is determined that the body movement level is the highest (in this embodiment, the body movement level is “high”), the body movement level is determined using a flag indicating the body movement level. The controller 1 may be configured not to execute the body movement level determination from when the flag is set to a value indicating “high” until the second predetermined period T ends.

  The control unit 1 stores the determination result of the body movement level determination in the storage unit 11, transmits notification information based on the determination result of the body movement level to the display unit 2 and the sound output unit 3, and displays the display unit 2. And the body movement level of the user H is notified via the sound output part 3 (FIG. 4, SA6).

For example, based on display data that is notification information received from the control unit 1, the display unit 2 performs a second predetermined period (for example, 5 minutes) T ₀ based on body movement level determination, as shown in FIG. 7C. , T ₁ , T ₂ ..., The determination result of the body movement level of the user H is color-coded for each body movement level and displayed in time series.

For example, the period T ₁ (17:05 to 17:10) in which the body movement level is determined to be “high” is red, and the period T ₃ (17:15 to 17:20) in which the body movement level is determined to be “medium”. ) Is yellow, and periods T ₀ and T ₂ (17:00 to 17:05, 17:10 to 17:15) in which the body motion level is determined to be “small” are green, and the body motion levels are color-coded. The visual display makes it easier for the supervisor to understand the body movement level of the user H, changes in the body movement level, and the like.

  Further, for example, by setting the display color of the body motion level to a warning color such as red during the period when the body motion level is determined to be “high”, it is easy to visually alert the monitor.

  For example, the sound output unit 3 outputs an alarm sound or the like from the speaker during a period in which the body movement level is determined to be “high” based on sound output data that is notification information received from the control unit 1.

  For example, only when the body movement level of the user H of the bed portion 91 is high, the monitor is audibly notified, so that only the period in which the monitor needs to be most alerted is notified. be able to.

  In addition, although the structure which alert | reports a body movement level to a monitor by the display part 2 and the sound output part 3 is preferable, it is not limited to this structure, Only either the display part 2 or the sound output part 3 is used. It may be configured to be notified by.

  As described above, the display unit 2 and the sound output unit 3 function as notification means for notifying the body movement level of the user H on the bed part 91, so that the body movement of the user H on the bed part 91 is performed. A monitor (for example, a caregiver, a caregiver, etc.) who checks the body movement status of the user H on the bed portion 91 by displaying the level or outputting a sound easily sets the body movement level of the user H. Can know.

In addition, if the configuration is provided with a notification unit, even when the body movement status and body movement level of the user H are monitored in real time, the monitor displays the sound and the body movement level of the user H with a display or sound. When the body movement level of the user H is monitored in real time, the flow from SA3 to SA6 in the flowchart shown in FIG. The process is repeated while it is determined that the user is in bed 91, that is, until it is determined that the user H has left the floor.

  In addition, the alerting | reporting information made by the control part 1 is not limited only to the alerting | reporting information about a body movement level, You may comprise so that various determination results may be alert | reported as needed.

  In addition, the notification unit has been described as including the display unit 2 and the sound output unit 3, but the notification unit is not limited thereto. For example, the notification unit includes a printing unit including a printer and prints the body movement level on a sheet or the like. May be configured to output.

  In addition, the control part 1 is good to perform the bed leaving determination which determines that the user H left the floor as follows.

For example, in the control unit 1, the total load value (WT = LW ₁ + RW ₁ + LW ₂ + RW ₂ ) obtained by adding the four load values detected from the load sensor 8 is less than a predetermined threshold (for example, 10 kgf). In such a case, it may be determined that the user H of the bed portion 91 has left the bed.

  In the above description, the control unit 1 has been described to execute the movement start determination, the body movement state determination, and the body movement level determination at the timing when the detection value of the load sensor 8 is read. However, the present invention is not limited to this. Each determination may be performed at different timings, as long as the body movement level is determined based on at least the determination result of the body movement state determination and the determination result of the movement start determination. .

  Further, in the above description, the body movement level of the user H on the bed 91 is determined in real time. However, the user in a specified period based on data such as the load value W stored in the storage unit 11. It may be configured to output the determination result of the body movement level of H.

  Furthermore, the control unit 1 may be configured to capture data of detected values from a plurality of load sensors 8 acquired in advance, and various determinations may be performed based on the captured detected value data.

For example, the control unit 1 performs the movement start determination for every second predetermined period T ₀ , T ₁ , T ₂ ... For all data to be determined, and then the second predetermined period T ₀ , T ₁ , The body movement state determination for each T ₂ ... Is executed, and finally the movement start determination and the body movement state determination stored in the storage unit 11 for each second predetermined period T ₀ , T ₁ , T ₂ . Based on the determination result, the body movement level may be determined for each second predetermined period T ₀ , T ₁ , T ₂ .

  In this case, the control unit 1 does not necessarily include the input / output unit 12.

  The body movement level determination device 100 may further be configured to include an operation unit including a switch that starts the body movement level determination of the user H on the bed portion 91 when pressed. With such a configuration, the body movement level determination can be executed only when the monitor needs it, so there is no waste.

  In the above description, the control unit 1 calculates the load change amount based on the load value from the load sensor 8 and determines the body movement level based on the load change amount. However, the detected value of the load sensor 8 is used as the load value. Instead, the amount of change in the detected value (signal value) may be calculated, and the body movement level may be determined based on this amount of change.

In the above description, the control unit 1 executes the process using the data value obtained by multiplying the load values RW ₁ , RW ₂ , LW ₁ , and LW ₂ from the load sensor 8 by 10 times. However, it is not limited to this.

  As described above, the body movement level determination device 100 determines each load change amount for a predetermined time of a detection value from the load sensor 8 that detects loads applied to a plurality of parts of the bed 91 that are provided apart from each other. Based on the first determination means for determining whether or not the total load change amount V obtained every first predetermined period exceeds a threshold value, and on the bed portion 91 based on the detection value from the load sensor 8 Based on the determination result of the movement determination means and the determination result of the first determination means, the body movement level of the user H is determined stepwise based on whether or not the user H has started moving. For example, if the user H is lightweight, the weight change amount of the user H is determined by the difference in the weight of the user H, for example, even if the user H is turned over. Significant impact on results However, the body movement level is determined by adding the determination result of the movement start determination that is slightly affected by the difference in the weight of the user H to the determination result of the body movement state determination (first determination). The influence of the difference is reduced, and the body movement level can be determined with high accuracy.

  Moreover, by accumulating the amount of change in the load, the movement amount of the bed 9 user H can be grasped and the body movement state can be easily determined.

  In addition, if a body motion level determination system including the body motion level determination device 100 of the present invention and a load sensor 8 that detects loads applied to a plurality of parts of the bed 91 that are provided apart from each other is constructed, It becomes a body movement level determination system that can obtain the same effect as that produced by the body movement level determination apparatus 100 described above.

  The embodiment described above is merely an example of the present invention, and it is needless to say that the specific configuration and the like can be appropriately changed and designed within the scope of the effects of the present invention.

1 ... controller 2 ... display unit 3 ... sound output unit 8 (81-84) ... load sensor 9 ... bed 11 ... storage unit 91 to 94 ... leg portion 100 ... motion level determination device _W (RW 1, _RW 2, LW ₁ , LW ₂ ) ... Load value L _th (L _th1 , L _th2 ) ... Threshold (first threshold, second threshold)

Claims (10)

Detected value change obtained for each first predetermined period based on each detected value change amount of a detected value from a load sensor that detects a load applied to a plurality of parts provided on the bed part spaced apart from each other for a predetermined time A first determination means for determining whether or not the total amount exceeds a threshold, and stepwise determining a body movement state of the user on the bed based on the determination result;
Based on the detection value from the load sensor, movement start determination means for determining whether or not the user on the bed has started moving,
Second determination means for stepwise determining a user's body movement level based on the determination result of the movement start determination means and the determination result of the first determination means;
With
The movement start determining means continues the detection value fluctuation with respect to the determination reference value set corresponding to the load sensor for a predetermined time or longer and is equal to or lower than a predetermined lower limit value or higher than a predetermined upper limit value (however, the predetermined lower limit value <0, 0 < If it is the predetermined upper limit value), it is determined that the user has started to move, the case detection value variation is smaller than the greater than the predetermined lower limit value and the predetermined upper limit value, or, the detection value variation is less than a predetermined lower limit value or the predetermined upper limit A body movement level determination device characterized in that, when the duration of a state equal to or greater than a value is less than the predetermined time, it is determined that the user has not started moving. The determination result of the first determination means is a determination result that the user's body movement state is small, and a determination that the user's body movement state is relatively larger than the user's body movement state in the determination result. Results, and
The second determination means determines the body movement level of the user every second predetermined period, and the determination result of the first determination means is a determination result that the body movement state of the user is small. 2. In some cases, if it is determined that the user has started to move by the movement start determining means, it is determined that the body movement level is higher than the body movement state of the determination result of the first determination means. The body movement level determination device according to 1.   Furthermore, when the determination result of the first determination unit is a determination result that the body movement state of the user is relatively large, the second determination unit does not depend on the determination result of the movement start determination unit. The body movement level determination apparatus according to claim 2, wherein the body movement state of the determination result of one determination means is a body movement level of the user. In the movement start determining means,
The largest detection value among the detection values from the load sensor is set as the first determination reference value, the second largest load value is set as the second determination reference value, and the load sensor that detects the first determination reference value is determined as the first determination. When the load sensor that detects the reference sensor and the second determination reference value is the second determination reference sensor,
The detection value fluctuation with respect to the determination reference value set corresponding to the load sensor is a determination reference sensor that detects a detection value to be determined for at least one determination reference sensor of the first and second determination reference sensors. The body movement level determination device according to any one of claims 1 to 3, wherein the detection value fluctuation is relative to a determination reference value corresponding to.   The first determination means determines a user's body movement state in a stepwise manner based on whether or not the detected value change total amount exceeds a plurality of set thresholds. The body movement level determination apparatus in any one of -4.   The first determination means provides the total amount of change in the detection value, one on each of the left and right sides of the bed portion and one on each of the left and right sides of the bed portion, and a load applied to these portions of the bed portion. The body according to any one of claims 1 to 5, wherein the body is obtained for each of the first predetermined periods based on a detected value change amount of a detected value from a load sensor for detecting a predetermined time. Dynamic level determination device.   The body movement level determination apparatus according to claim 1, further comprising a display unit that displays a determination result determined by the second determination unit. The body movement level determination device according to any one of claims 1 to 7,
A load sensor for detecting a load applied to a plurality of parts provided apart from each other in the bed part;
A body movement level determination system comprising:   9. The body movement level determination system according to claim 8, wherein the load sensor is provided at one place on each side of the head side and one place on each side of the foot part. Detected value change obtained for each first predetermined period based on each detected value change amount of a detected value from a load sensor that detects a load applied to a plurality of parts provided on the bed part spaced apart from each other for a predetermined time A first determination step of determining whether or not the total amount exceeds a threshold, and stepwise determining a body movement state of the user on the bed based on the determination result;
Based on a detection value from the load sensor, a movement start determination step for determining whether or not the user on the bed has started moving;
A second determination step for stepwise determining a user's body movement level based on the determination result of the movement start determination step and the determination result of the first determination step;
With
In the movement start determining step, the fluctuation of the detected value with respect to the determination reference value set corresponding to the load sensor continues for a predetermined time or longer and is equal to or lower than a predetermined lower limit value or higher than a predetermined upper limit value (however, the predetermined lower limit value> 0, 0 < If it is the predetermined upper limit value), it is determined that the user has started to move, the case detection value variation is smaller than the greater than the predetermined lower limit value and the predetermined upper limit value, or, the detection value variation is less than a predetermined lower limit value or the predetermined upper limit A body movement level determination method, characterized in that, when the duration of a state equal to or greater than a value is less than the predetermined time, it is determined that the user has not started to move.

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