JP2005204931A - Bed monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed monitoring device capable of easily recognizing the posture change of a person and the change of the position of a human body part in a bed part over a fixed period. <P>SOLUTION: The bed monitoring device is provided with a posture discriminating function for successively discriminating the posture of the person on the bed part at every prescribed interval of time by the number of pressure sensitive sensor means in which pressurizing force indicated by the output is more than prescribed among the plurality of pressure sensitive sensor means, the posture of the person discriminated by the posture discriminating function is plotted in a graph at every prescribed interval of time, and the change of the posture of the person on the bed part is displayed. Also, the bed monitoring device is provided with a position discriminating function for successively discriminating the position of the human body part of the person in the bed part from the position of the bed part of the pressure sensitive sensor means in which the pressurizing force indicated by the output is more than prescribed among the plurality of pressure sensitive sensor means, the position of the human body part discriminated by the position discriminating function is plotted in the graph at every prescribed interval of time, and the change of the position of the human body part is displayed. <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 portion or the number of times of turning over. It is difficult to grasp the change in the position of the human body part and the human body part, and could not be used as effective data for rehabilitation on the bed and functional training of the elderly.
In view of the above problems, an object of the present invention is to provide a bed monitoring apparatus capable of easily grasping a change in a posture of a person and a change in a position of a human body part over a certain period.

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,
A posture discrimination function 35 for sequentially discriminating the posture of a person on the bed portion 10 every predetermined time depending on the number of the pressure sensor means for which the pressing force indicated by the output of the plurality of pressure sensor means is a predetermined value or more. It is provided that the posture of the person discriminated by the posture discriminating function 35 is plotted on a graph every predetermined time so as to display the change in the posture of the person on the bed 10.

According to another technical means of the present invention, the posture determination by the posture determination function 35 is performed in the descending order of the number of pressure-sensitive sensor means in which the pressing force indicated by the output of the pressure-sensitive sensor means is equal to or greater than a predetermined value. And a sitting posture, a lateral posture, and a supine posture.
According to another technical means of the present invention, a plurality of pressure-sensitive sensor means whose outputs change according to the pressing force are arranged on the bed part 10, and a person on the bed part is based on the output of each pressure-sensitive sensor means. In the bed monitoring device designed to recognize the movement of
A position discriminating function 36 for sequentially discriminating the position of a human body part in the bed portion 10 from the position of the bed portion 10 of the pressure sensor means in which the pressing force indicated by the output of the plurality of pressure sensor means is a predetermined value or more. It is provided that the position of the human body part determined by the position determination function 36 is plotted on a graph every predetermined time to display a change in the position of the human body part.

Further, according to another technical means of the present invention, a plurality of pressure-sensitive sensor means 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 human movements,
Among the plurality of pressure-sensitive sensor means in the first range 41 of the bed 10, the number of pressure-sensitive sensor means for which the pressing force indicated by the output is equal to or greater than a predetermined value, and the plurality of feelings in the second range 42 of the bed 10. The pressure sensor means is compared with the number of pressure sensitive sensor means for which the pressing force indicated by the output is equal to or greater than a predetermined value, and the number of pressure sensitive sensor means in the first range 41 is the number of pressure sensitive sensor means in the second range 42. More than the predetermined number, it is determined that the human body part is on the first range 41 side, and the number of pressure sensitive sensor means in the second range 42 is the number of pressure sensitive sensor means in the first range 41. When the number exceeds a predetermined number than the number, it is determined that the human body part is on the second range 42 side, and the number of pressure-sensitive sensor means in the first range 41 and the pressure-sensitive sensor means in the second range 42 When the difference from the number is within a predetermined number, the human body part is an intermediate portion between the first range 41 and the second range 42 Position determination function 36 determines that there is provided,
The determination result determined by the position determination function 36 is plotted on a graph every predetermined time to display the change in the position of the human body part.

According to another technical means of the present invention, the first range 41 is a right-side range of the front half of the bed 10 corresponding to the upper body of a person sleeping on the bed 10, and the second range 42 is a left range of the front half of the bed 10 corresponding to the upper half of the person sleeping on the bed 10, and the position determination function 36 determines the position of the upper body of the person on the bed 10 on the right and left sides. It is in the point which discriminate | determines from left and right center.
According to another technical means of the present invention, the first range 41 is a right-side range of the second half of the bed portion 10 corresponding to the lower half of the person sleeping on the bed portion 10, and the second range. 42 is the left range of the second half of the bed 10 corresponding to the lower half of the person sleeping on the bed 10, and the position determination function 36 determines the position of the lower body of the person on the bed 10 on the right and left sides. It is in the point which discriminate | determines from left and right center.

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 a change in the posture of a person over a certain time in the bed. In addition, it is possible to easily grasp the change in the position of the human body part over a certain time in the bed portion.

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, as shown in FIG. 5, the personal computer 31 has a posture determination function 35 for sequentially determining the posture of the person on the bed portion 10 every predetermined time, and a position for sequentially determining the position of the human body part on the bed portion 10. The personal computer 31 plots the posture of the person discriminated by the posture discriminating function 35 on a graph every predetermined time to display a change in the posture of the person on the bed 10 and position discrimination. The position of the human body part determined by the function 36 is plotted on a graph every predetermined time, and the change in the position of the human body part is displayed.

The posture determination function 35 is based on the number of sensor units 2 in which the pressing force indicated by the output of the sensor units 2 of ch 0 to 15 is equal to or greater than a predetermined value (1000 (1000 is 3 cN / cm 2) shown in FIG. 8). The posture of the person on the unit 10 is sequentially determined every predetermined time. The posture discriminating by the posture discriminating function 35 is made into a bed leaving posture, a sitting posture, a lateral posture, and a supine posture in order from the smallest number of sensor units 2 in which the pressing force indicated by the output of the sensor unit 2 becomes a predetermined value or more. .
More specifically, when the pressing force (digital signal corresponding to each sensor unit 2) indicated by the output of the sensor units 2 of ch 0 to 15 is smaller than 1000 shown in FIG. When the pressing force (digital signal corresponding to each sensor unit 2) is 1000 or more shown in FIG. 8, the digital signal is converted to “0”. The converted values (“1” or “0”) of the converted digital signals are added to 16 digital signals corresponding to the sensor units 2 of ch 0 to 15 and the added value is larger than “14”. (“16” or “15”), it is determined that the person is getting out of bed, and if the added value is “14” or less and greater than “11” (“14”, “13” or “12”), the sitting position When the added value is “11” or less and greater than “8” (“11”, “10”, or “9”), it is determined that the lateral position is determined, and the added value is “8” or less ( If it becomes “8” to “0”), it is determined as the supine position. If the posture determination function 35 determines that the person is getting out of bed, the numerical value “5.5” indicating that the person is getting out of the bed is plotted on the graph, and if the posture determination function 35 determines that the person is in the sitting position, the numerical value “ 5.0 ”is plotted on the graph, and if the posture discriminating function 35 is determined to be in the lateral position, the numerical value“ 4.5 ”indicating the lateral position is plotted on the graph, and the posture discriminating function 35 is determined to be in the supine position. Then, the numerical value “4.0” indicating the supine position is plotted on the graph.

Then, the posture determination function 35 determines the posture of getting out of bed, sitting, lying down or supine, and leaving the bed “5.5”, sitting down “5.0”, lying down “4.5” or supine “4. The plot of “0” on the graph is sequentially repeated every predetermined time (2 seconds) until a set time (for example, 24 hours), and as shown in the upper part of FIG. Changes are displayed.
The position determination function 36 sequentially determines the position of the human body part of the bed 10 from the position of the bed 10 of the sensor unit 2 at which the pressing force indicated by the output of the plurality of sensor units 2 is greater than or equal to a predetermined value. The position determination function 36 determines the position of the human body part from among the plurality of sensor units 2 in the first range 41 of the bed 10, the number of sensor units 2 whose output pressure is greater than or equal to a predetermined value, and the bed Of the plurality of sensor units 2 in the second range 42 of the section 10, the number of sensor units 2 whose pressing force indicated by the output is equal to or greater than a predetermined value is compared, and the number of sensor units 2 in the first range 41 is the second. When the predetermined number exceeds the number of sensor units 2 in the range 42, it is determined that the human body part is on the first range 41 side, and the number of sensor units 2 in the second range 42 is the first range. When the number of sensor units 2 exceeds the predetermined number, the human body part is determined to be on the second range 42 side, and the number of sensor units 2 in the first range 41 and the second range 42 are determined. Difference from the number of sensor units 2 When within a predetermined number, body part of a person is determined to be in the middle portion of the first range 41 and the second range 42.

  More specifically, the first range 41 is the right range (the sensor units 2 of ch0, 1, 4, and 5 are arranged in the front half of the bed 10 corresponding to the upper half of the person sleeping on the bed 10). The second range 42 is a left-side range (the sensor units 2 of ch2, 3, 6, and 7) of the front half of the bed 10 corresponding to the upper half of the person sleeping on the bed 10. ), And the position discriminating function 36 causes the pressing force (ch0, 1, 4, 5, 5) indicated by the output of the sensor units 2 of ch0, 1, 4, 5 in the first range 41 to be displayed. The number of sensor units 2 (digital signals) in which the digital signal corresponding to each sensor unit 2 is equal to or greater than a predetermined value (1000 shown in FIG. 8), and the sensors of ch2, 3, 6, 7 in the second range 42 The pressing force indicated by the output of unit 2 (ch2 The number of sensor units 2 (digital signals) in which the digital signals corresponding to the sensor units 2, 3, 6, and 7) are equal to or greater than a predetermined value (1000 shown in FIG. 8). When the number of 2 (digital signals) is greater than the number of sensor units 2 (digital signals) in the second range 42 by a predetermined number (2.2), the upper body of the person is on the first range 41 side (left side). ) And the number of sensor units 2 (digital signals) in the second range 42 is larger than the number of sensor units 2 (digital signals) in the first range 41 by more than a predetermined number (2.2). In addition, it is determined that the upper body of the person is on the second range 42 side (right side), and the number of sensor units 2 (digital signals) in the first range 41 and the number of sensor units 2 (digital signals) in the second range 42 Within a predetermined number (2.2) When, upper body of the person is determined to be in the middle portion of the first range 41 and the second range 42 (horizontal center). If the position determination function 36 determines that the upper body is on the left side, the numerical value “1.0” indicating the left side is plotted on the graph, and if the position determination function 36 determines that the upper body is on the right side, If a numerical value “3.0” indicating the right side is plotted on the graph, and the position determination function 36 determines that the upper body is at the center of the left and right, the numerical value “2.0” indicating the center of the left and right is displayed on the graph. Plot. In the case of the lower body, “1.1”, “2.1”, and “3.1” are displayed, and the graph is made easier to read by avoiding being confused with the upper body.

Then, the position determination function 36 determines the position of the left, right, or left and right center of the upper body and plots the left “1.1”, right “3.1”, or left and right center “2.1” on the graph. Up to a set time (for example, 24 hours), it is repeatedly performed every predetermined time (2 seconds), and the change in the position of the upper body of the person on the bed 10 is displayed as shown in the lower part of FIG. ing.
Further, the other first range 41 is the right range (the sensor units 2 of ch8, 9, 12, 13 are arranged in the front half of the bed 10 corresponding to the lower half of the person sleeping on the bed 10. The other second range 42 is the left-side range (the sensor unit 2 of ch10, 11, 14, 15) of the front half of the bed 10 corresponding to the lower half of the person sleeping on the bed 10. , And the position discriminating function 36 causes the pressing force (ch8, 9, 12, 13) indicated by the output of the sensor units 2 of ch8, 9, 12, 13 in the first range 41 to be displayed. The number of sensor units 2 (digital signals) whose digital signal corresponding to each sensor unit 2 is equal to or greater than a predetermined value (1000 shown in FIG. 8) and the sensors of ch10, 11, 14, 15 in the second range 42. Out of unit 2 Compared with the number of sensor units 2 (digital signals) in which the pressing force indicated by the output (digital signal corresponding to each sensor unit 2 of ch10, 11, 14, 15) exceeds a predetermined value (1000 shown in FIG. 8) When the number of sensor units 2 (digital signals) in the first range 41 is greater than the number of sensor units 2 (digital signals) in the second range 42 by a predetermined number (2.2), the lower body of the person Is on the side (left side) of the first range 41, the number of sensor units 2 (digital signals) in the second range 42 is a predetermined number (the number of sensor units 2 (digital signals) in the first range 41). 2.2), it is determined that the lower body of the person is on the second range 42 side (right side), and the number of sensor units 2 (digital signals) in the first range 41 and the second range 42 Sensor unit 2 (digital signal When the difference between the number of predetermined number (2.2) within in), the lower body of the person is determined that the middle portion of the first range 41 and the second range 42 (horizontal center). If the position determination function 36 determines that the lower body is on the left side, the numerical value “1.1” indicating the left side is plotted on the graph, and if the position determination function 36 determines that the lower body is on the right side, If the numerical value “3.1” indicating the right side is plotted on the graph, and the position determination function 36 determines that the lower body is at the left and right center, the numerical value “2.1” indicating the right and left center is displayed on the graph. Plot.

  Then, the position determination function 36 determines the left side, right side, or left / right center position of the lower body and plots the left side “1.1”, right side “3.1”, or left / right center “2.1” on the graph. Until the set time (for example, 24 hours), it is repeatedly performed every predetermined time (2 seconds), and the change in the position of the lower body of the person on the bed 10 is displayed as shown in the lower part of FIG. ing. In addition, when the number of sensor units 2 in which the pressing force indicated by the output among the eight sensor units 2 (ch0 to ch7) in the upper body exceeds a predetermined value (1000 shown in FIG. 8) exceeds a predetermined number (6) Do not plot (same for lower body).

  According to the 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 of the pressing force and the pressing force of the ch7 sensor unit 2 are reduced. The resistance value (combined resistance R) of the sensor unit 2 of ch7 changes according to the area. 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 33, 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.
Next, the posture determination 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, when the pressing force indicated by the digital signal among the digital signals corresponding to the sensor units 2 of ch 0 to 15 is smaller than 1000, the digital signal is converted to “1”, and the pressing force indicated by the digital signal is 1000. At that time, the digital signal is converted to “0”.
In step 3, the converted values (“1” or “0”) of the digital signals corresponding to the sensor units 2 of ch 0 to 15 are added.
In step 4, it is determined whether or not the added value is greater than 14. If the added value is greater than 14, the process proceeds to step 5, and step 5 is determined (determined) as getting out of bed “5.5”. In step 11, the bed leaving “5.5” is plotted on the graph.

If it is determined in step 4 that the added value is 14 or less, the process proceeds from step 4 to step 6. In step 6, it is determined whether or not the added value is greater than 11, and if the added value is greater than 11. For example, the process proceeds to step 7, where the sitting position “5.0” is determined (determined) in step 7, and the sitting position “5.0” is plotted on the graph in step 11.
If it is determined in step 6 that the added value is 11 or less, the process proceeds from step 6 to step 8. In step 8, it is determined whether or not the added value is greater than 8. If the added value is greater than 8, For example, the process proceeds to step 9 where step 9 determines (determines) the lateral position “4.5”, and step 11 plots the lateral position “4.5” on the graph.

If it is determined in step 8 that the added value is 8 or less, the process proceeds from step 8 to step 10, where step 10 determines (determines) the supine position “4.0”, and step 11 determines that the supine position “4.0”. Is plotted on the graph.
Proceeding from step 11 to step 12, it is determined in step 12 whether or not the next 2 seconds later digital signal is to be taken in depending on whether or not it is within a set period (for example, 24 hours) for displaying a change in posture. If it is within the set period, it is determined that the data has been taken in, and the process returns to step 1, and thereafter the same operation is repeated until the set period is reached.

  Therefore, as shown in the upper part of FIG. 12, the bent line is bent every 2 seconds, leaving the bed “5.5”, the sitting position “5.0”, the lateral position “4.5”, or the supine position “4.0”. ”Is displayed over a set time (for example, 24 hours). From the upper graph of FIG. 12, it is possible to easily collect information on how the posture of the person on the bed 10 changes over a long period of time. Changes in the posture of the person (patient) M 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. Moreover, it can utilize for the judgment of a patient's health condition from the number of times of rolling over and the exercise ability.

Next, the position determination operation by the personal computer (control means) 31 will be described with reference to the flowcharts of FIGS.
In step 21, the digital signals for 16 channels 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 22, when the pressing force indicated by the digital signal among the digital signals corresponding to the sensor units 2 of ch0 to 15 is smaller than 1000, the digital signal is converted to “1”, and the pressing force indicated by the digital signal is 1000. At that time, the digital signal is converted to “0”.

In the case of an operation for determining the position of the upper body of the person sleeping on the bed 10, the process proceeds from step 22 to step 23, and in step 23, the sensor units 2 of ch 0, 1, 4, 2, 3, 6, 7. It is determined whether or not the addition value obtained by adding the converted values (“1” or “0”) of each digital signal corresponding to is greater than 6, and if greater than 6, there is no plot in step 24 It is determined (determined) as (abnormal), and the process proceeds to step 38 without plotting on the graph in step 37.
If it is determined in step 23 that the added value is 6 or less, the process proceeds from step 23 to step 25. In step 25, the converted value ("1") of each digital signal corresponding to the sensor unit 2 of ch0, 1, 4, 5 ”Or“ 0 ”) and the second addition obtained by adding the converted values (“ 1 ”or“ 0 ”) of the digital signals corresponding to the sensor units 2 of ch2, 3, 6, 7 And subtracting the second addition value from the first addition value to determine whether or not the subtraction value is greater than 2.2. It is determined (determined) as “1.0”, and the left side “1.0” is plotted on the graph in step 37.

If it is determined in step 25 that the subtraction value is 2.2 or less, the process proceeds from step 25 to step 27. In step 27, the subtraction value obtained by subtracting the second addition value from the first addition value obtained in step 25 is If it is greater than -2.2, it is determined (determined) as "3.0" on the right side in step 28, and "3.0" on the right side in step 37. Is plotted on the graph.
If it is determined in step 27 that the subtraction value is -2.2 or less, the process proceeds from step 27 to step 29. In step 29, it is determined (determined) as the left / right center “2.0”, and in step 37, the left / right center “ 2.0 "is plotted on the graph.

In the case of the operation of determining the position of the lower body of the person sleeping on the bed 10, the process proceeds from step 22 to step 30, and in step 30, the sensor units 2 of ch 8, 9, 12, 13, 10, 11, 14, 15. It is determined whether or not the added value obtained by adding the converted values (“1” or “0”) of each digital signal corresponding to is greater than 6, and if greater than 6, no plot is made in step 31 It is determined (determined) as (abnormal), and the process proceeds to step 38 without plotting on the graph in step 37.
If it is determined in step 30 that the added value is 6 or less, the process proceeds from step 30 to step 32. In step 32, the converted value ("1") of each digital signal corresponding to the sensor unit 2 of ch8, 9, 12, 13 is obtained. ”Or“ 0 ”) and a second addition obtained by adding the converted value (“ 1 ”or“ 0 ”) of each digital signal corresponding to the sensor unit 2 of ch10, 11, 14, 15 And subtract the second addition value from the first addition value to determine whether or not the subtraction value is greater than 2.2. It is determined (determined) as “1.1”, and the left side “1.1” is plotted on the graph in step 37.

If it is determined in step 32 that the subtraction value is 2.2 or less, the process proceeds from step 32 to step 34. In step 34, the subtraction value obtained by subtracting the second addition value from the first addition value obtained in step 32 is If it is greater than -2.2, it is determined (determined) as "3.1" on the right side in step 35, and "3.1" on the right side in step 37. Is plotted on the graph.
If it is determined in step 34 that the subtraction value is −2.2 or less, the process proceeds from step 34 to step 36, where it is determined (determined) as left and right center “2.1” in step 36, and left and right center “ 2.1 "is plotted on the graph.

The process proceeds from step 37 to step 38. In step 37, 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 change in posture. If it is within the set period, it is determined that the data is taken in, and the process returns to step 21, and thereafter, the same operation is repeated until the set period is reached.
Accordingly, as shown in the lower part of FIG. 12, the bent line is bent every 2 seconds, and the left and right sides of the human upper and lower body are “1.1”, “3.1” and “2.1”, respectively. ”Or 4 positions change without plotting are obtained over a set time (eg, 24 hours). From the lower graph of FIG. 12, it is possible to easily collect information on how the positions of the upper and lower body of the person in the bed 10 change over a long period of time. The change in the position of the upper body and lower body of the person (patient) M on 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, it is possible to determine a change in position 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. Moreover, it can utilize for the judgment of a patient's health condition from the number of times of rolling over and the exercise ability. It can also be used as data for estimating the timing of getting out of bed from the change in posture and the position change of the upper and lower body on the bed.

  In the above embodiment, the first range 41 is the right range of the second half of the bed 10 corresponding to the lower half of the person sleeping on the bed 10, and the second range 42 is the bed 10. The range of the lower half of the bed 10 corresponding to the lower body of the sleeping person is set to the left side, and the position determination function 36 determines the position of the lower body of the person on the bed 10 as the right side, the left side, and the center of the left and right. In addition, the other first range 41 is set as the right-side range of the second half of the bed portion 10 corresponding to the lower half of the person sleeping on the bed portion 10, and the other second range 42 is set on the bed portion 10. The position of the lower half of the person in the bed 10 is discriminated between the right side, the left side, and the center of the left and right by the position determination function 36. Thereby, the human body discriminated by the position discriminating function 36 As the position of the position, the position of the upper body and the lower body is discriminated and the change in the position of the upper body and the lower body is displayed, but instead of this, by the position discriminating function 36, other than the upper body or the lower body is displayed. The position of the human body part may be determined and the change in the position may be displayed. For example, the first range 41 may be a portion (ch0,1) corresponding to the head and chest of a person sleeping on the bed 10. , 2, and 3, where the sensor unit 2 of 2, 3 is disposed) and the second range 42 is laid on the bed 10. Left range (range in which ch2, 3 sensor units 2 are arranged) of portions corresponding to human head and chest (portions in which ch0, 1, 2, 3 sensor units 2 are arranged) And the position discrimination function 36 The position of the head and chest of a person in the bed portion 10, may be judged in the right and left and right middle.

  Moreover, in the said embodiment, the several sensor arrange | positioned in the bed part 10 so that the bed part 10 may be divided into several blocks for the several pressure-sensitive sensor means for calculating | requiring a person's posture and the position of a human body part. A plurality of sensor units 2 having a plurality of pressure sensors 13 and 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 arranged in the bed part 10, it is constituted by a plurality of pressure-sensitive sensors arranged at intervals on the bed part 10, and each pressure-sensitive sensor May be separately input to the personal computer 31, and the posture of the person and the position of the human body part may be obtained from the output of each pressure sensor.

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. In addition, a device capable of recording data is attached after the A / D conversion unit 29, and after capturing data for a certain period of time, only the data is transferred to the personal computer 31 in another location, or the data-acquired unit is stored in another location. The data may be taken to the personal computer 31 and the personal computer 31 may read the data.

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 attitude | position discrimination | determination control operation | movement of the personal computer. It is a flowchart which shows the position determination control operation | movement of the personal computer. It is a flowchart which shows the position determination control operation | movement of the personal computer. It is a graph which shows the change of the posture of a person and the change of the position of a human body part which are the outputs of the personal computer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bed monitoring apparatus 2 Sensor unit 10 Bed part 13 Pressure sensor 31 Personal computer (control means)
35 posture discriminating function 36 position discriminating function 41 first range 42 second range

Claims (8)

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,
Posture discriminating function for sequentially discriminating the posture of a person on the bed (10) at predetermined time intervals depending on the number of pressure-sensitive sensor portions at which the pressing force indicated by the output thereof exceeds a predetermined value among a plurality of pressure-sensitive sensor devices. (35) is provided, and the posture of the person discriminated by the posture discriminating function (35) is plotted on a graph every predetermined time so as to display the change in the posture of the person on the bed (10). A bed monitoring device as a feature.   The posture is discriminated by the posture discriminating function (35) in the descending order of the number of the pressure-sensitive sensor means in which the pressing force indicated by the output of the pressure-sensitive sensor means becomes a predetermined value or more. 2. The bed monitoring apparatus according to claim 1, wherein the bed monitoring apparatus is adapted to a posture. 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 position for sequentially determining the position of the human body part of the bed portion (10) from the position of the bed portion (10) of the pressure sensor means where the pressure indicated by the output of the plurality of pressure sensor means is greater than or equal to a predetermined value. A discriminating function (36) is provided, and the position of the human body part discriminated by the position discriminating function (36) is plotted on a graph every predetermined time to display a change in the position of the human body part. Bed monitoring device. 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,
Of the plurality of pressure-sensitive sensor means in the first range (41) of the bed part (10), the number of pressure-sensitive sensor means for which the pressing force indicated by the output is equal to or greater than a predetermined value, and the second range of the bed part (10) The number of pressure-sensitive sensor means in the first range (41) is compared with the number of pressure-sensitive sensor means in which the pressing force indicated by the output of the plurality of pressure-sensitive sensor means in (42) exceeds a predetermined value. When the number of pressure-sensitive sensor means in the two ranges (42) exceeds the predetermined number, it is determined that the human body part is on the first range (41) side, and the sense of the second range (42) When the number of the pressure sensor means is larger than the number of the pressure sensitive sensor means in the first range (41) exceeding the predetermined number, it is determined that the human body part is on the second range (42) side, When the difference between the number of pressure-sensitive sensor means in one range (41) and the number of pressure-sensitive sensor means in the second range (42) is within a predetermined number, Position determination function of parts of the human body determines that the middle portion of the first range (41) and a second range (42) (36) is provided,
A bed monitoring apparatus characterized by plotting the discrimination results discriminated by the position discriminating function (36) on a graph every predetermined time to display a change in the position of a human body part.   The first range (41) is the right range of the front half of the bed (10) corresponding to the upper half of the person sleeping on the bed (10), and the second range (42) is the bed. The position on the left side of the front half of the bed (10) corresponding to the upper half of the person sleeping on the section (10) is determined by the position determination function (36). The bed monitoring apparatus according to claim 4, wherein a right side, a left side, and a left / right center are discriminated from each other.   The first range (41) is the right-side range of the second half of the bed (10) corresponding to the lower half of the person sleeping on the bed (10), and the second range (42) is the bed. The position on the left side of the second half of the bed portion (10) corresponding to the lower body of the person sleeping on the portion (10), and the position determination function (36) allows the position of the lower body of the person in the bed portion (10) The bed monitoring apparatus according to claim 4, wherein a right side, a left side, and a left / right center are discriminated from each other.   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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