JP2005204930A - Bed monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed monitoring device easily grasping the degree of posture changes and the momentum of a person on a bed part. <P>SOLUTION: This bed monitoring device, of a bed part 10 is disposed with a plurality of pressure sensitive sensor means 2 changing their outputs according to pushing pressures and recognizes the movement of the person on the bed part 10 based on the outputs of the respective pressure sensitive sensor means. This device is further provided with a control means 31 sequentially calculating the amounts of the pressure changes for every predetermined time in predetermined areas of the bed part 10 based on the changes in the pushing pressures indicated by the outputs of the pressure sensitive means, plots the amounts of the pressure changes calculated by the control means 31 for every predetermined time on a graph, and displays a composed pressure change in the predetermined areas of the bed part 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bed monitoring apparatus that recognizes the movement of a person sleeping on a bed, for example.

As a bed monitoring device that recognizes the movement of a person such as a patient sleeping on a bed such as a bed, a plurality of pressure sensitive sensors whose outputs change according to the pressing force are arranged on the bed such as a bed. There are devices that sequentially determine the position and posture of a person on the bed based on the output of the sensor and display them on a monitor or detect a turn (for example, Patent Documents 1 and 2).
JP 2001-258957 A JP 2003-24392 A

However, the conventional bed monitoring apparatus can recognize the current position and posture of the patient on the bed part, or the number of times of turning over, but for example, the change in the patient's position on the bed part for a certain period (24 hours or the like). It was difficult to grasp the degree and the amount of exercise, and could not be used as effective data for rehabilitation on the bed and functional training for the elderly.
An object of this invention is to provide the bed monitoring apparatus which can grasp | ascertain easily the degree of a person's body posture change in a bed part, and an exercise amount in view of the said problem.

The technical means of the present invention for solving this technical problem is that a plurality of pressure-sensitive sensor means whose outputs change according to the pressing force are arranged in the bed portion 10, and based on the output of each pressure-sensitive sensor means. In the bed monitoring device adapted to recognize the movement of a person on the bed 10,
Control means 31 is provided for sequentially calculating the amount of pressure change per predetermined time in a predetermined range of the bed 10 from the change in pressing force indicated by the output of the pressure sensor means, and the amount of pressure change calculated by the control means 31 is determined for a predetermined time. Each point is plotted on a graph, and the pressure change in the predetermined range of the bed 10 is displayed.

Further, according to another technical means of the present invention, a plurality of pressure-sensitive sensor means 2 whose outputs change according to the pressing force are arranged on the bed part 10, and on the bed part 10 based on the output of each pressure-sensitive sensor means. In the bed monitoring device designed to recognize the movement of
A first change in which a pressure change amount obtained by subtracting the pressing force indicated by the output of the pressure sensitive sensor means a predetermined time before the pressing force indicated by the output of the pressure sensitive sensor means is sequentially obtained for each of the plurality of pressure sensitive sensor means at every predetermined time. A calculation function 35 is provided, and a second change calculation function 36 for calculating a pressure change amount in a predetermined range of the bed 10 is provided from a plurality of pressure change amounts obtained by the first change calculation function 35, and a second change is provided. The pressure change amount calculated by the calculation function 36 is plotted on a graph every predetermined time, and the pressure change in the predetermined range of the bed portion 10 is displayed.

According to another technical means of the present invention, the second change calculating function 36 includes an adding means 37 for sequentially adding pressure change amounts corresponding to a plurality of pressure sensitive sensor means 2 within a predetermined range of the bed 10. And a dividing means 38 for sequentially dividing the added value added by the adding means 37 by the number of pressure-sensitive sensor means within the predetermined range, and plotting the divided values divided by the dividing means 38 on a graph every predetermined time. The pressure change in the predetermined range of the bed portion 10 is displayed.
According to another technical means of the present invention, a plurality of predetermined ranges of the bed portion 10 are set corresponding to a human body part of the bed portion 10 and a pressure change is displayed for the plurality of predetermined ranges. It is in the point.

According to another technical means of the present invention, the predetermined range of the bed portion 10 is a craniothoracic correspondence range 41 corresponding to the head and chest of the person of the bed portion 10, and the abdomen of the person of the bed portion 10 and The abdominal waist corresponding range 42 corresponding to the waist, the thigh corresponding range 43 corresponding to the thigh of the person of the bed 10, or the lower leg corresponding range 44 corresponding to the lower leg of the person of the bed 10. There is in point.
Another technical means of the present invention is that the plurality of pressure-sensitive sensor means are a plurality of sensor units 2 arranged on the bed portion 10 so as to partition the bed portion 10 into a plurality of blocks. A plurality of pressure sensitive sensors 13 are provided and a plurality of pressure sensitive sensors 13 are connected to each other so that an output corresponding to the pressing force acting on the block can be taken out.

  According to another technical means of the present invention, the plurality of pressure-sensitive sensor means are a plurality of pressure-sensitive sensors arranged on the bed 10 and a plurality of pressure-sensitive sensors whose outputs change according to the pressing force. In that point.

  It is possible to easily grasp the degree of body position change and the amount of exercise in the bed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bed 3 has a gantry 4 formed in a substantially rectangular shape in plan view, and a mat 5 laid on the gantry 4.
A cover 6 is provided above the mat 5, a sensor unit (pressure-sensitive sensor means) 2 is placed on the cover 6, and a mounting sheet 7 for attaching the sensor unit 2 is provided on the sensor unit 2. It has been. Further, a cushion material 8 (for example, a nonwoven fabric), a waterproof cloth 9 and the like are sequentially provided on the mounting sheet 7. The mounting sheet 7 is made of cloth or the like, and the lower surface of the mounting sheet 7 can be detachably bonded to a surface fastener 17 described later at any position.

The cover 6, the mounting sheet 7, and the cushion material 8 are covered with a waterproof cloth 9 and placed on the mat 5. These are slightly smaller than the mat 5 or the same size as the rectangular shape in plan view. Is formed. A normal sheet 11 is laid on the waterproof cloth 9, and the cover 6, the attachment sheet 7, the cushion material 8, and the waterproof cloth 9 are covered with the sheet 11.
Therefore, the mat 5, the cover 6, the attachment sheet 7, the cushion material 8, the waterproof cloth 9, and the sheets 11 constitute the bed 10, and a person can sleep on the bed 10.

As shown in FIGS. 1 to 5, a plurality (16) of sensor units 2 are provided between the mounting sheet 7 and the cover 6, and each unit sensor 2 includes a plurality of pressure-sensitive sensors 13 and a flexible member. A pair of support plates 14, a pair of substrates 15 to which a plurality of pressure-sensitive sensors 13 are attached, a storage body 16, and a fixture 17.
The storage body 16 has an upper sheet 16a and a lower sheet 16b made of, for example, a waterproof polyethylene resin. By welding the periphery of the upper sheet 16a and the periphery of the lower sheet 16b, a bag shape is obtained. Is formed.

The pressure sensor 13, the support plate 14, the substrate 15, and the like are stored in the storage body 16. The storage body 16 has a rectangular shape in plan view, and hook-and-loop fasteners (attachments) 17 are provided at the four corners of the outer upper surface of the storage body 16 and at both ends in the width direction of the substantially middle portion in the longitudinal direction.
Therefore, as shown in FIG. 3, the storage body 16 (sensor unit 2) can be fixed to the cushion material 8 via the attachment sheet 7 by attaching the surface fastener 17 of the storage body 16 to the lower surface of the attachment sheet 7. It has become.
The pair of support plates 14 are housed in both ends in the width direction (both ends in the short direction) of the storage body 16, and each support plate 14 is formed in a rectangular plate shape with, for example, polycarbonate resin. The thickness of each support plate 14 is set to about 0.5 mm and can be bent.

A double-sided tape 18 for bonding the upper sheet 16a and the lower sheet 16b is provided between the pair of support plates 14 in the housing 16 so that the support plate 14 does not rattle in the width direction. It has become.
A substrate 15 (sheet substrate) formed in a sheet shape is provided on the upper surface of each support plate 14, and a copper foil or the like for connecting the pressure sensitive sensors 13 in parallel on the sheet substrate 15. The configured wiring 20 is printed.
On each sheet substrate 15, a plurality (four) of pressure-sensitive sensors 13 are provided at regular intervals in the longitudinal direction of the sheet substrate 15. Each unit sensor 2 has eight pressure-sensitive sensors 13. It is provided so as to be distributed substantially evenly over the entire area.

The pressure sensors 13 are arranged on a support plate 14, and the pressure sensors 13 are connected in parallel on a sheet substrate 15.
Specifically, two wirings 20 a and 20 b extending in the longitudinal direction are provided on the sheet substrate 15, and two lead wires 21 a and 21 b are provided from the pressure sensor 13. One lead wire 21a is connected to one wiring 20a of the substrate 15, and the other lead wire 21b of the pressure-sensitive sensor 13 is connected to the other wiring 20b of the substrate 15. 20 b are connected to each other through a connection line 19.

Each pressure-sensitive sensor 13 has an output value that changes according to the pressing force. Specifically, when a load is applied to the pressure-sensitive sensor 13, a variable resistance whose electrical resistance changes according to the load. As shown in FIG. 4, when no load is applied to the pressure sensor 13, the resistance value is large, and as the load is applied to the pressure sensor 13, the resistance value decreases. ing.
Therefore, the combined resistance R of the sensor unit 2 can be expressed as follows, assuming that the resistance of each pressure sensor 13 is r1, r2, r3.

1 / R = 1 / r1 + 1 / r2 + 1 / r3 + ... + 1 / r8
In addition, as described above, the eight pressure sensitive sensors 13 are provided in the sensor unit 2 so as to be substantially evenly distributed. For example, the pressing force per unit area is constant and the pressing area for pressing the sensor unit 2 is large. The resistance (synthetic resistance) of the sensor unit 2 is small. Conversely, if the pressing force per unit area is constant and the pressing area that presses the sensor unit 2 is small, the resistance extracted from the sensor unit 2 increases.
That is, when the pressing force per unit area is constant, the resistance of the sensor unit 2 increases or decreases according to the pressing area.

Also, for example, if the pressing area for pressing the sensor unit 2 is constant and the pressing force for pressing the sensor unit 2 is large, the resistance of the sensor unit 2 decreases, and conversely, the pressing force for pressing the sensor unit 2 with a constant pressing area is applied. If it is small, the resistance of the sensor unit 2 becomes large.
That is, when the pressing area for pressing the sensor unit 2 is constant, the resistance of the sensor unit 2 increases or decreases according to the pressing force.
One sheet substrate 15 is provided with an output line 22 (output code), and this output line 22 can be connected to a voltage converter 28 described later.

The output line 22 can be wired from the inside of the storage body 16 to the outside through a wiring hole 23 provided at the front end of the storage body 16. The wiring hole 23 is closed with a waterproof adhesive, whereby the housing body 16 is sealed so that liquids such as water droplets do not enter the housing body 16.
As shown in FIGS. 1 and 5, the bed monitoring apparatus 1 includes a bed 10, a plurality of sensor units 2, a voltage conversion unit 28 that converts an output (resistance) extracted from the sensor unit 2 into a voltage, It has an A / D conversion unit 29 for A / D converting the voltage converted by the voltage conversion unit 28, a control unit 31 (personal computer), and a display unit 32 (monitor).

As shown in FIGS. 5 and 6, the plurality of sensor units 2 are provided so as to divide the entire bed part 10 into a plurality of parts vertically and horizontally so as to partition the bed part 10 into a plurality of blocks.
Specifically, the sensor unit 2 with the output line 22 side of the sensor unit 2 facing the front side of the bed 10 (the front side of the short side of the bed 3) on the front end side of the bed 10 is the width direction of the bed 10. Four sensor units 2 with the output line 22 side of the sensor unit 2 facing the front side of the bed 10 are arranged in the width direction of the bed 10 on the rear end side of the bed 10. Yes.
Further, in the middle part of the bed part 10, eight sensor units 2 with the output line 22 side of the sensor unit 2 facing the front side of the bed part 10 are arranged in four rows in the width direction of the bed part 10 in two rows in front and back. Has been.

That is, the four sensor units 2 are arranged in the width direction (vertical direction) of the bed portion 10, and the four sensor units 2 group arranged in the width direction are arranged in the length direction (lateral direction) of the bed portion 10. Four rows are arranged, and thereby, 16 sensor units 2 are provided in the bed portion 10.
The plurality of sensor units 2 provided in the bed portion 10 have the same size, the arrangement intervals in the width direction of the sensor units 2 are substantially constant, and the arrangement intervals in the width direction of the sensor units 2 are substantially constant. . Thereby, the upper surface of the bed part 10 is divided into 16 blocks, and the areas of the blocks are substantially equal.

Further, in the bed portion 10, the interval in the width direction of each pressure sensor 13 of the sensor units 2 adjacent in the width direction is set to be substantially the same as the interval in the width direction of each pressure sensor 13 provided in the sensor unit 2. Has been.
In addition, as shown in FIG. 5, channel numbers 0 to 15 (ch 0 to 15) are assigned to the plurality of sensor units 2, respectively. You can see if it corresponds to (part).
In the state where a person is sleeping on the bed 10, the four sensor units 2 from ch0 to ch3 correspond to the head and chest of the human body, and the four sensor units 2 from ch4 to ch7 correspond to the chest and the human body. Corresponding to the waist, the four sensor units 2 of ch8 to 11 correspond to the thigh of the human body, and the four sensor units 2 of ch12 to 15 correspond to the lower leg of the human body.

The eight sensor units 2 of 0ch to 7 correspond to the upper body of the human body, and the eight sensor units 2 of 8ch to 15 correspond to the lower body of the human body.
Each of these sensor units 2 is connected to the voltage conversion unit 28, and the magnitude of the pressing force acting on each block is input to the voltage conversion unit 28 via the sensor unit 2.
The voltage conversion unit 28 converts the resistance of each sensor unit 2 by a resistance voltage dividing circuit or the like, and 16 sensor units 2 are connected to the voltage conversion unit 28 via output lines 22. .

Accordingly, the resistance of each sensor unit 2 is converted into a voltage by the voltage converter 28, then sent to the A / D converter 29, converted into a digital signal by the A / D converter 29, and transmitted to the personal computer 31. It has become so.
For example, in the case of this embodiment, when the pressing force acting on the block is large as shown in FIG. 7, the resistance output from the corresponding sensor unit 2 decreases, and the voltage output from the voltage converter 28 increases. Conversely, when the pressing force acting on the block is small, the resistance output from the corresponding sensor unit 2 increases, and the voltage output from the voltage converter 28 decreases. The magnitude of the voltage output from the voltage converter 28 is digitized by the A / D converter 29, and the digitized signal is converted to a digital signal and transmitted to the personal computer 31.

The A / D conversion unit 29 divides and digitizes the output signal (voltage) of the voltage conversion unit 28 into 12 bits (0 to 4095), and is set so that the numerical value increases as the voltage increases. That is, the numerical value increases when the pressing force acting on the block is large, and the numerical value decreases when the pressing force acting on the block is small.
Thus, 16 digital signals converted into 12-bit values are output from the A / D converter 29 to the personal computer 31 corresponding to each sensor unit 2. For example, the digital signal corresponding to the ch7 sensor unit 2 has a voltage waveform as shown in FIG. 8 that fluctuates according to the movement of the person on the bed 10 and is output from the A / D converter 29 to the personal computer 31. The

The personal computer (control means) 31 determines (estimates) the state of the person sleeping on the bed 10 based on the digital signal input from the A / D converter 29, The applied pressing force is displayed on the monitor 32.
Further, the personal computer 31 sequentially calculates (calculates as an absolute value) the pressure change amount for each predetermined time (2 seconds) in the predetermined range of the bed portion 10 from the change in the pressing force indicated by the output of the sensor unit 2. The amount of pressure change is plotted on a graph every predetermined time (2 seconds), and the combined pressure change in a predetermined range of the bed portion 10 is displayed.

  That is, the personal computer 31 is provided with a first change calculation function 35 and a second change calculation function 36 as shown in FIG. The first change calculating function 35 calculates a pressure change amount (postural change degree) obtained by subtracting the pressing force indicated by the output of the sensor unit 2 a predetermined time (2 seconds) from the pressing force indicated by the output of the sensor unit 2. The sensor unit 2 is obtained sequentially every predetermined time (2 seconds). Here, the pressure change amount is calculated as an absolute value. The second change calculation function 36 calculates a pressure change amount in a predetermined range of the bed portion 10 from a plurality of pressure change amounts corresponding to each sensor unit 2 obtained by the first change calculation function 35. The change calculation function 36 includes an addition unit 37 that sequentially adds the pressure change amounts corresponding to the plurality of sensor units 2 in the predetermined range of the bed portion 10, and a sensor unit in the predetermined range of the addition value added by the addition unit 37. A dividing unit 38 that sequentially divides by two numbers, and plots the divided values (pressure change amount, degree of change in posture) divided by the dividing unit 38 on a graph every predetermined time, and the pressure in a predetermined range of the bed 10. The change (degree of posture change) is displayed on the monitor 32 and can be printed.

As the predetermined range of the bed part 10, as shown in FIG. 6, the head / chest corresponding range 41 corresponding to the head and chest of the person M of the bed part 10, and the abdomen and waist of the person M of the bed part 10. A plurality (four ranges) of an abdominal waist corresponding range 42, a thigh corresponding range 43 corresponding to the thigh of the person M of the bed 10, and a lower leg corresponding range 44 corresponding to the lower leg of the person M of the bed 10. These are set corresponding to the human body parts and indicate pressure changes in the respective ranges 41, 42, 43, 44.
More specifically, with respect to the head-chest corresponding range 41 of the bed portion 10, four pressure change amounts corresponding to the sensor units 2 of ch 0 to 3 in the head-chest corresponding range 41 are added by the adding means 37. The added value is sequentially divided by the number “4” of the sensor units 2 of ch0 to 3 in the head-chest corresponding range 41 by the dividing means 38, and the divided value divided by the dividing means 38 is shown by a solid line in FIG. As shown by the polygonal line A, the change in pressure in the head-chest corresponding range 41 of the bed 10 is displayed by plotting on a graph every predetermined time (2 seconds).

Further, for the belly / lumbar corresponding range 42 of the bed 10, four pressure change amounts (graphs of FIGS. 10 to 13) corresponding to the ch 4 to 7 sensor units 2 in the belly / lumbar corresponding range 42 are added by the addition function 37. The added value is sequentially divided by the number “4” of the sensor units 2 of ch 4 to 7 in the abdominal waist corresponding range 42 by the adding means 37, and the division value divided by this division function is shown in FIG. 14 is plotted on a graph every predetermined time (2 seconds) as indicated by a broken line B of a two-point difference line, and the pressure change in the abdomen-lobe corresponding range 42 of the bed portion 10 is displayed.
Further, for the thigh corresponding range 43 of the bed portion 10, four pressure change amounts corresponding to the sensor units 2 of ch 8 to 11 in the thigh corresponding range 43 are added by the adding means 37, and the added addition value is The division means 38 sequentially divides by the number “4” of the sensor units 2 of ch 8 to 11 in the thigh corresponding range 43, and the division value divided by the division means 38 is shown by a broken line C in FIG. The change in pressure in the thigh corresponding range of the bed portion 10 is displayed by plotting on a graph every predetermined time (2 seconds).

In addition, for the lower leg corresponding range 44 of the bed 10, four pressure change amounts corresponding to the sensor units 2 of ch 12 to 15 in the lower leg corresponding range 44 are added by the adding means 37, and the added value is The division means 38 sequentially divides by the number “4” of the sensor units 2 of ch 12 to 15 in the lower leg corresponding range 44, and the division value divided by the division means 38 is plotted on a graph every predetermined time (2 seconds). Then, the pressure change in the thigh corresponding range 43 of the bed portion 10 is displayed (not shown).
According to the above-described embodiment, when a person is sleeping on the bed 10, for example, when the ch7 sensor unit 2 is pressed by a human body, the magnitude and pressure of the ch7 sensor unit 2 are reduced. Depending on the area, the resistance value (combined resistance R) of the sensor unit 2 of ch7 changes. Then, the voltage is converted into a voltage by the voltage converter 28 according to the resistance value, and the voltage is digitized by the A / D converter 29. As shown in FIG. A digital signal having a voltage waveform such that the voltage (pressing force) changes according to the movement of is sent to the personal computer 31.

Therefore, according to the bed portion monitoring apparatus, the sensor unit 2 having the plurality of pressure sensors 13 divides the bed portion 10 into a plurality of blocks, and the pressing force acting on each sensor unit 2 is transmitted from each sensor unit 2. Since the output is enabled, the temporal change in the pressing force of each sensor unit 2 (change in pressing force in each block) is received by the personal computer 31 and monitored by the display unit 32, so that the patient in the bed 10 can be monitored. Can recognize movement.
In order to recognize the movement of the patient on the bed 10, a plurality of pressure sensors 13 are connected to each other to form a unit, and the bed 10 is partitioned vertically and horizontally by the unitized sensor unit 2. Since the output is taken out, the number of the output lines 22 can be reduced with respect to the entire bed portion 10, and as a result, the wiring structure can be simplified.

Further, for example, in order to recognize the movement of a patient sleeping on the bed 10, it is only necessary to process the output of the unitized sensor unit 2, and it is not necessary to process all the outputs obtained from the pressure sensors 13. Therefore, output processing is easy.
In addition, since the block area is substantially equal and the entire bed part 10 is divided into a plurality of vertical and horizontal directions, the patient's movement can be recognized regardless of the position of the bed part 10 and the vertical and horizontal divisions are made. Therefore, it is easy to specify the position of the patient on the bed 10, it is possible to grasp where the patient is on the bed 10, and it is possible to estimate which posture the patient is in. .

Furthermore, since the pressure sensor 13 is configured such that the resistance changes according to the pressing force, an output can be easily taken out from the pressure sensor 13, and a signal output from the pressure sensor 13 can be easily processed. In addition, it is difficult for the person to recognize the movement of the body for a long time because of privacy, so by making the sansa unit, it becomes difficult to discern the movement of the body of the detail, but the movement of the body Can be sensitively recognized. By the way, the sensitivity of sensitivity was impossible for abdominal breathing, but chest breathing was observable from the monitor.
Next, the control operation by the personal computer (control means) 31 will be described with reference to the flowchart of FIG.

In step 1, 16 ch digital signals corresponding to the sensor units 2 of ch 0 to 15 transmitted from the A / D converter 29 are taken into the personal computer 31.
In step 2, the absolute value of the amount of change in pressure obtained by subtracting the pressing force indicated by the output of the sensor unit 2 from the pressing force indicated by the output of the sensor unit 2 by the first change calculating function 35, The sensor units 2 of ch0 to 15 are sequentially obtained every predetermined time (2 seconds). Here, n indicates the number of channels, and t indicates time (seconds).
By the operation in step 2, for example, a waveform as shown in FIG. 10 is obtained as a graph indicating the pressure change amount (the degree of change in body position) corresponding to the ch4 sensor unit 2, and the pressure change amount corresponding to the ch5 sensor unit 2 is obtained. A waveform as shown in FIG. 11 is obtained as a graph showing the pressure, and a waveform as shown in FIG. 12 is obtained as a graph showing the pressure change amount corresponding to the sensor unit 2 of ch6, and the pressure corresponding to the sensor unit 2 of ch7 is obtained. As a graph showing the amount of change, a waveform as shown in FIG. 13 is obtained.

In step 3, it is determined whether or not the number of channels of the sensor unit 2 is smaller than 4. If the number of channels is 0, 1, 2, 3, the process proceeds to step 4, and if the number of channels is 4 or more, Proceed to step 7.
In step 4, four pressure changes corresponding to the sensor units 2 of ch 0 to 3 in the craniothoracic range 41 of the bed 10 are added by the adding means 37, and in step 5, the graph to be displayed is It is determined that the corresponding range is 41, that is, the graph to be displayed is a broken line A (solid line). In step 6, the addition value added by the adding unit 37 in step 4 is divided by the number “4” of the sensor units 2 of ch 0 to 3 in the head-chest corresponding range 41 by the dividing unit 38. Proceeding from step 6 to step 18, the division value obtained in step 6 is plotted on the graph in step 18, and the pressure change in the head-chest corresponding range 41 of the bed portion 10 is displayed by a broken line A as shown in FIG. 14. .

If the number of channels is 4 or more in step 3, the process proceeds from step 3 to step 7. In step 7, it is determined whether or not the number of channels of the sensor unit 2 is smaller than 8, and the number of channels is 4, 5, 6 7, the process proceeds to step 8, and if the number of channels is 8 or more, the process proceeds to step 11.
In step 8, the four pressure changes corresponding to the sensor units 2 of ch 4 to 7 in the belly / loin corresponding range 42 of the bed 10 are added by the adding means 37, and in step 9, the graph to be displayed is It is determined that the corresponding range is 42, that is, the graph to be displayed is a broken line B (two-dot chain line). In step 10, the addition value added by the adding unit 37 in step 8 is divided by the number “4” of the sensor units 2 of ch 4 to 7 in the abdominal / hip corresponding range 42 by the dividing unit 38. Proceeding from step 10 to step 18, the division value obtained in step 10 is plotted on the graph in step 18, and the pressure change in the head-chest corresponding range 41 of the bed portion 10 is displayed by a broken line B as shown in FIG. 14. .

If the number of channels is 8 or more in step 7, the process proceeds from step 7 to step 11. In step 11, it is determined whether or not the number of channels of the sensor unit 2 is smaller than 12, and the number of channels is 8, 9, 10 , 11, the process proceeds to step 12, and if the number of channels is 12 or more, the process proceeds to step 15.
In step 12, the four pressure changes corresponding to the sensor units 2 of ch8 to 11 in the thigh corresponding range 43 of the bed portion 10 are added by the adding means 37. In step 13, the graph to be displayed is the thigh corresponding range. 43, that is, it is determined that the graph to be displayed is a broken line C (broken line). In step 14, the addition value added by the adding means 37 in step 12 is divided by the number “4” of the sensor units 2 of ch 8 to 11 in the thigh corresponding range 43 by the dividing means 38. Proceeding from step 14 to step 18, the division value obtained in step 14 is plotted on the graph in step 18, and the pressure change in the thigh corresponding range 43 of the bed portion 10 is displayed by a broken line C as shown in FIG. 14.

  If the number of channels is 12 or more (ch12 to 15) in step 11, the process proceeds from step 11 to step 15, and in step 15, corresponding to the sensor units 2 of ch12 to 15 in the lower leg corresponding range 44 of the bed 10. The two pressure change amounts are added by the adding means 37, and it is determined in step 16 that the graph to be displayed is in the lower leg corresponding range 44. In step 17, the addition value added by the adding unit 37 in step 15 is divided by the number “4” of the sensor units 2 of ch 12 to 15 in the lower leg corresponding range 44 by the dividing unit 38. Proceeding from step 17 to step 18, in step 18, the division value obtained in step 17 is plotted on a graph, and as shown in FIG. 14, the combined pressure change in the thigh corresponding range 43 of the bed portion 10 is displayed by a broken line.

The process proceeds from step 18 to step 19. In step 19, it is determined whether or not a digital signal after the next 2 seconds is taken in depending on whether or not it is within a set period (for example, 24 hours) for displaying a pressure change, If it is within the set period, it is determined to be taken in, and the process returns to step 1 and the same operation is repeated until the set period is reached.
Therefore, as shown in FIG. 14, the broken lines A, B, and C of the four ranges of the couch chest corresponding range 41, the abdominal and hip corresponding range 42, the thigh corresponding range 43, and the lower leg corresponding range 44 of the bed portion 10 are shown. Can be obtained. From the graph of FIG. 14, it is possible to easily collect information on how much the body position changes in an arbitrary time range, and the degree of change in the momentum and posture of the person (patient) M on the bed 10. Can be easily and reliably known. Thereby, for example, it becomes possible to evaluate the degree of exercise effort for rehabilitation of a frail care recipient with high accuracy, and it is possible to effectively improve the exercise ability of the care recipient and eventually prevent bedridden. In addition, the degree of movement or the like can be determined for each specific part of the human body, and it is possible to determine whether the amount of exercise is excessive or insufficient for each specific part of the human body. Further, it is possible to numerically determine the degree of body position change depending on how many times the pressure change amount (position change degree) shown in FIG. 14 exceeds 2000, 1500, or 1000 within a certain time. In addition, by calculating the average posture change degree in a certain time range, it is possible to easily know the daily posture change degree or the posture change degree due to the difference of patients (subjects). In addition, the average value of the degree of change in posture can be used to determine the ability to turn over on the bed 10, or can be used to determine the patient's health status based on the number of times of turning and the exercise ability. Conversely, it can also be used to understand the resting state of patients with illness that require rest.

  In the above-described embodiment, the sensor unit 2 divides a predetermined range (head chest corresponding range 41, abdominal and hip corresponding range 42, thigh corresponding range 43, lower leg corresponding range 44) of the bed portion 10 for obtaining the pressure change amount. The pressure change amount obtained by subtracting the pressing force indicated by the output of the sensor unit 2 a predetermined time before the pressing force indicated by the output of the sensor unit 2 is set to be larger than the block of the bed portion 10 for a plurality of sensor units 2. A first change calculation function 35 that sequentially obtains every time is provided, and a second change calculation function 36 that calculates a pressure change amount in a predetermined range of the bed 10 from a plurality of pressure change amounts obtained by the first change calculation function 35. The pressure change amount calculated by the second change calculation function 36 is plotted on a graph every predetermined time so that the pressure change in the predetermined range of the bed portion 10 is displayed. However, instead of this, the block of the bed part 10 partitioned by the sensor unit 2 and the predetermined range of the bed part 10 for which the amount of pressure change is obtained may be made to coincide with each other. The pressure change amount obtained by subtracting the pressing force indicated by the output of the pressure-sensitive sensor means 2 a predetermined time before the pressing force indicated by the output of the sensor means 2 can be used as the pressure change amount in the predetermined range of the bed portion 10 as it is. The second change calculation function 36 can be omitted by only the first change calculation function 35. In this case, for example, the sensor unit 2 is enlarged and the block of the bed part 10 partitioned by the sensor unit 2 is made to coincide with a predetermined range (such as a head-chest corresponding range 41) of the bed part 10 for which the pressure change amount is obtained. Alternatively, a predetermined range of the bed part 10 for obtaining the amount of pressure change may be reduced to match the block of the bed part 10 partitioned by the sensor unit 2.

  Moreover, in the said embodiment, it is the several sensor unit 2 arrange | positioned in the bed part 10 so that the several pressure-sensitive sensor means for calculating | requiring the amount of pressure changes may divide the bed part 10 into a some block, In addition, a plurality of pressure sensitive sensors 13 are provided and a plurality of pressure sensitive sensors 13 are connected to each other so that an output corresponding to the pressing force acting on each block can be taken out. However, instead of this, as a plurality of pressure-sensitive sensor means for determining the amount of pressure change arranged in the bed part 10, it is constituted by a plurality of pressure-sensitive sensors arranged on the bed part 10 at intervals. The pressure sensor outputs are individually input to the personal computer 31, the pressure change amount is obtained from the output of each pressure sensor, the pressure change amount is plotted on a graph every predetermined time, and the bed 10 It may be displayed pressure changes in a predetermined range.

In the above-described embodiment, the pressure sensor means (sensor unit 2 to pressure sensor 13) has a resistance value that changes in accordance with the pressing force. The unit 2 to the pressure sensitive sensor 13) may directly output a voltage or current according to the pressing force.
In the above embodiment, the bed portion 10 is configured by the mat 5, the cover 6, the attachment sheet 7, the cushioning material 8, the waterproof cloth 9, and the sheets 11 of the upper portion of the bed 3. The bed 10 may be composed of a futon or mat laid on the bed.

In the embodiment, the plurality of pressure sensors 13 provided in the sensor unit 2 are connected in parallel. Alternatively, the pressure sensors 13 may be connected in series with each other. .
Further, in the above embodiment, the entire bed part 10 is divided into 16 parts in total of 4 parts in the vertical direction and 4 parts in the horizontal direction by the 16 sensor units 2, but the number of vertical and horizontal divisions of the whole bed part 10 or the whole bed part 10 is divided. On the other hand, the number of vertical divisions and the number of horizontal divisions are not limited to the above. For example, the entire bed part 10 may be divided into 15 parts, that is, 5 parts vertically and 3 parts horizontally by 15 sensor units 2.

  Moreover, in the said embodiment, although the several sensor unit 2 provided in the bed part 10 was respectively the same magnitude | size (same area), the mutual magnitude | size of the sensor unit 2 is not limited above, For example, The bed unit 10 may be provided with two types of large and small sensor units 2 having different sizes.

It is a disassembled schematic side view of the bed which shows one Embodiment of this invention. It is a top view of the sensor unit. It is sectional drawing of the vicinity which has arrange | positioned the sensor unit. It is an output characteristic figure of the same pressure sensor. It is a whole block diagram of the bed monitoring apparatus. It is explanatory drawing which provides the sensor unit in a bed part. It is the voltage characteristic figure which converted the output of the sensor unit into voltage. It is a voltage waveform diagram inputted into the personal computer from the sensor unit side. It is a flowchart which shows the control operation of the personal computer. It is a graph which shows the posture change degree calculated by the output of the sensor unit of ch4. It is a graph which shows the posture change degree calculated by the output of the sensor unit of ch5. It is a graph which shows the posture change degree calculated by the output of the sensor unit of ch6. It is a graph which shows the posture change degree calculated by the output of the sensor unit of ch13. It is a graph which shows the posture change degree calculated about each predetermined range.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bedding monitor apparatus 2 Sensor unit 10 Bedding part 13 Pressure sensor 32 Display part 35 1st change calculation function 36 2nd change calculation function 37 Adding means 38 Dividing means 41 Craniochorous range 42 Abdominal and waist corresponding range 43 Thigh corresponding range 44 Lower leg support range

Claims (7)

A plurality of pressure-sensitive sensor means whose outputs change according to the pressing force are arranged on the bed part (10), and the movement of a person on the bed part (10) is recognized based on the output of each pressure-sensitive sensor means. In the sleeping bed monitor device,
Control means (31) is provided for sequentially calculating the amount of pressure change per predetermined time in the predetermined range of the bed (10) from the change in the pressing force indicated by the output of the pressure sensitive sensor means, and the control means (31) calculates the pressure change amount. A bed monitoring device characterized in that the pressure change amount is plotted on a graph every predetermined time to display the pressure change in a predetermined range of the bed (10). A plurality of pressure-sensitive sensor means whose outputs change according to the pressing force are arranged on the bed part (10), and the movement of a person on the bed part (10) is recognized based on the output of each pressure-sensitive sensor means. In the sleeping bed monitor device,
A first change in which a pressure change amount obtained by subtracting the pressing force indicated by the output of the pressure sensitive sensor means a predetermined time before the pressing force indicated by the output of the pressure sensitive sensor means is sequentially obtained for each of the plurality of pressure sensitive sensor means at every predetermined time. A calculation function (35) is provided, and a second change calculation function (36 for calculating a pressure change amount in a predetermined range of the bed (10) from a plurality of pressure change amounts obtained by the first change calculation function (35). ) Is provided, and the pressure change amount calculated by the second change calculation function (36) is plotted on a graph every predetermined time so as to display the pressure change in the predetermined range of the bed (10). A bed monitoring device.   The second change calculating function (36) includes an adding means (37) for sequentially adding pressure change amounts corresponding to a plurality of pressure sensitive sensor means within a predetermined range of the bed (10), and an adding means (37). Dividing means (38) for sequentially dividing the added value by the number of pressure-sensitive sensor means within the predetermined range, and plotting the divided values divided by the dividing means (38) on a graph every predetermined time; The bed monitoring apparatus according to claim 2, wherein a pressure change in a predetermined range of the bed (10) is displayed.   The predetermined range of the bed part (10) is set in plural corresponding to the human body part of the person of the bed part (10), and pressure change is displayed for the plurality of predetermined ranges. The bed monitoring apparatus according to 1 or 2.   The predetermined range of the bed portion (10) is a cranio-thoracic correspondence range (41) corresponding to the head and chest of the person of the bed portion (10), and corresponds to the abdomen and waist of the person of the bed portion (10). Lower leg corresponding range corresponding to the lower leg part of the person in the bed part (10), or the thigh corresponding range (43) corresponding to the thigh part of the person in the bed part (10). The bed monitoring apparatus according to claim 1 or 2, wherein the bed monitoring apparatus is (44).   The plurality of pressure-sensitive sensor means are a plurality of sensor units (2) arranged on the bed part (10) so as to divide the bed part (10) into a plurality of blocks, and act on each block. A plurality of pressure-sensitive sensors (13) and a plurality of pressure-sensitive sensors (13) are connected to each other so that an output corresponding to the pressing force can be taken out. The bed monitoring apparatus according to claim 1 or 2.   The plurality of pressure-sensitive sensor means are a plurality of pressure-sensitive sensors arranged on the bed (10), and a plurality of pressure-sensitive sensors whose outputs change according to the pressing force. Or the bed monitoring apparatus according to 2;

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