JP2004194709A - Body position changing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turn-over device detecting the gravity center of a subject on a bed and effectively turning over the subject. <P>SOLUTION: This turn-over device is provided with, at least, a plurality of expansion bags disposed on the bed and an operating means expanding or contracting the expansion bags. This device is also provided with a turn-over action determination means determining whether the turn-over is necessary or not for the subject on the bed according to conditions, a gravity center detecting means detecting the gravity center of the subject on the bed, an expansion bag determining means, when the turn-over action determining means determines the necessity of the turn-over, selecting the expansion bags to be expanded or contracted from the gravity center detected by the gravity center detecting means, a turn-over means operating the operating means according to the determination of the expansion bag determining means and a turn-over determining means determining whether the gravity center detected by the gravity center detecting means is changed or not after the operation of the turn-over means and determining the completion of the turn-over when the gravity center is changed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a position changing device for changing the position of a subject on a bed, such as turning over, in order to prevent pressure sores, prevent snoring, etc. of a subject on a bed, for example, a bedridden patient.
[0002]
[Prior art]
The fluid pressure mat device disclosed in Patent Literature 1 configures a mat body in order to enable a patient to automatically take an appropriate posture change angle regardless of a patient's lying position in the mat body. A plurality of air bladders arranged in a plane, an air pump for feeding air into the air bladders, a pressure sensor for detecting a central axis of a patient's body lying on the mat body, and a body detected by the pressure sensors A control circuit that controls a switching valve that connects the air pump and each air bladder based on the central data and changes an inflation state of the air bladder that forms the mat body.
[0003]
The high-performance mattress disclosed in Patent Literature 2 divides the mattress into several sections, fills the sections with air, liquid, or gel-like fluid, and adjusts the filling amount to increase the height of each section. The size, size, and hardness are adjusted. In addition, sensors that sense pressure, vibration, and temperature are attached to each of the divided parts. Based on information from these sensors, the position of the sleeping person, respiratory rate, heart rate, snoring, and moaning are determined. The height and hardness of each part of the mattress are actively changed over time by detecting and estimating the state of the human body. Further, a sleeping position is detected, a turning method is estimated, a shape of the mattress is changed so as to induce turning, the turning is performed, and snoring is stopped. The sensors arranged in each of the above-mentioned parts include a sensor for measuring pressure, a sensor for measuring temperature, and a microphone for measuring sound waves.
[0004]
The balloon-type reversing device disclosed in Patent Literature 3 is configured such that the air port provided in the partition rubber is formed so that the diameter decreases in order from the one closer to the balloon fixing material, and when air is injected from the air injection port, The outer surface of the balloon surface rubber portion expands in order from the central portion of the balloon surface rubber portion to form a fan shape. Thereby, the bedridden patient can be effectively turned over.
[0005]
[Patent Document 1]
JP-A-11-76318 [Patent Document 2]
Japanese Patent Application Laid-Open No. H11-342049 [Patent Document 3]
JP 2002-177314 A
[Problems to be solved by the invention]
As described above, in the inventions described in Patent Literature 1 and Patent Literature 2, since the pressure sensor for detecting the center position of the body or the sleeping position is arranged in the air bag or each section, the cost is reduced. There is a problem that it becomes high. In addition, in the invention described in Patent Literature 3, since the bed patient is basically located near the center of the bed, when the patient is sleeping near the side of the bed, a considerable load is applied to the apparatus itself. However, there is a problem that the movement of the patient due to turning over becomes large.
[0007]
The present applicant has disclosed in Japanese Patent Application No. 2001-190928 that the load fluctuation of a load sensor arranged on the leg of a bed is detected to detect the biophysiological data and the center of gravity of the subject on the bed. In addition, the present applicant has disclosed in Japanese Patent Application No. 2002-330407 that the biometric data and the center of gravity of the subject on the bed are detected by detecting the distortion of the bed frame.
[0008]
In view of the above, an object of the present invention is to provide a body position changing device capable of detecting a center of gravity of a subject on a bed and thereby effectively changing the posture of the subject such as turning over.
[0009]
[Means for Solving the Problems]
Therefore, the position changing device of the present invention is a position changing device having at least a plurality of expansion / contraction bags arranged on a bed and an actuating means for inflating or contracting the expansion / contraction bags. Position change operation determining means for determining whether or not a position change is required, a center of gravity detection means for detecting the center of gravity of the subject on the bed, and a determination that the position change is necessary by the position change operation determination means In this case, from the position of the center of gravity detected by the center of gravity detection means, expansion / contraction bag determination means for selecting an expansion / contraction bag to be inflated or contracted; After the operation of the body position changing means, it is determined whether the center of gravity detected by the center of gravity detecting means has changed, and if the center of gravity has changed, it is determined that the body position change has been completed It is to and a that Positions change determination means.
[0010]
Further, it is preferable that the center-of-gravity detecting means, the expansion / contraction bag determining means, and the body position changing means are repeatedly executed until the body position change determining means determines that the posture change has been completed.
[0011]
Further, the body position change operation determining means, when detecting the snoring of the subject on the bed, it is desirable to determine that the body position change is necessary, when the center of gravity of the subject on the bed does not fluctuate for a predetermined time, It is desirable to determine that repositioning is necessary.
[0012]
Furthermore, it is desirable that the center of gravity detection means is a load sensor disposed on a leg of the bed, and is a strain sensor disposed on a frame of the bed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 (a) includes an expansion / contraction bag 5 disposed on a bed 20, for example, below a sheet 4, a load sensor 7 disposed at a lower end of the leg 2 of the bed 20, The control unit 6 controls the expansion / contraction bag 5 to expand or contract based on a signal from the load sensor 7. A method of calculating the center of gravity from the change in the load of the leg 2 of the bed 20 by the load sensor 7 is disclosed in Japanese Patent Application No. 2001-190928 by the present applicant.
[0015]
The postural change bed 1 shown in FIG. 1B includes an expansion / contraction bag 5 arranged on a bed 20, for example, under a sheet 4, a strain sensor 8 arranged on both sides of the frame 3 of the bed 20, The control unit 6 controls the expansion / contraction bag 5 to expand or contract based on the signal from the distortion sensor 8. A method of calculating the center of gravity from the variation in the load of the leg 2 of the bed 20 by the strain sensor 8 is disclosed in Japanese Patent Application No. 2002-330407. Further, in this embodiment, the distortion sensors 8 are arranged on the left and right frames 3, but by detecting the distortion of the upper, lower, left and right frames 3, it is possible to more finely grasp the center of gravity. .
[0016]
As shown in FIG. 2A, the bed 20 is divided into predetermined segments (in this embodiment, three rows and three columns), and the expansion / contraction bag 5 is arranged in each of the segments A1 to C3. As shown in FIG. 2B, the expansion / contraction bag 5 is connected to a fluid supply device 9, and a fluid such as air, water, or a gel liquid (air in this embodiment) is supplied by the fluid supply device 9. It is supplied to expand its volume and contract by discharging.
[0017]
Specifically, the fluid supply device 9 includes at least an air pump 10 and an air tank 11 that accumulates high-pressure air supplied by the air pump 10 and stabilizes the supply of air from the air pump 10. An intake-side solenoid valve 12 that is electrically opened and closed is disposed between the air tank 11 and the expansion / contraction bag 5, and a discharge side for discharging air in the expansion / contraction bag 5 is provided on an outlet side of the expansion / contraction bag 5. An electromagnetic valve 13 is provided. In this embodiment, the air tank 11 is provided, but the air may be supplied by directly driving the air pump 10.
[0018]
Also, by using a three-way valve as the electromagnetic valve 12 disposed between the air tank 11 and the expansion / contraction bag 5, supply of air from the air tank 11 to the expansion / contraction bag 5 and release of air from the expansion / contraction bag 15 to the atmosphere can be reduced. It can also be done with a single valve. In this embodiment, the intake-side solenoid valve 12 and the discharge-side solenoid valve 13 are provided for ease of explanation.
[0019]
The control unit 6 reads a signal from, for example, the load sensor 7 or the strain sensor 8 into a central processing unit (CPU) 62 via an A / D converter 61, calculates a center of gravity, and expands according to a predetermined program. The segment to be contracted and the segment to be contracted are selected, and the fluid supply device 9 is controlled via the drive circuit 63, and the suction-side solenoid valve 12 and the discharge-side solenoid valve 13 are controlled via the drive circuit 64 to lie on the bed 20. This is to change the body position of the subject such as turning over.
[0020]
The flowchart shown in FIG. 3 shows an example of the control executed by the CPU 62. Hereinafter, an example of the control will be described according to this flowchart.
[0021]
The control started from step 100 first calculates and detects the center of gravity of the subject lying on the bed 20 based on the signal from the load sensor 7 or the strain sensor 8 in step 110. Then, in step 120, snoring of the subject is detected based on a signal from the load sensor 7 or the strain sensor 8. Then, when the snoring of the subject is not detected in the determination of step 130 (absent), the detection of step 110 and step 120 is continued.
[0022]
If it is determined in step 130 that the subject is snoring (YES), the process proceeds to step 140 to determine an operating segment. In determining the operating segment, a segment in which the position of the detected center of gravity exists and a segment adjacent to the segment are selected and determined. Then, in step 150, the body position change control is executed. Specifically, the expansion / contraction bag 5 of the segment having the center of gravity is inflated, and the expansion / contraction bag 5 of the segment adjacent thereto is contracted. Alternatively, the expansion / contraction bag 5 of the segment having the center of gravity is contracted, and the expansion / contraction bag 5 of the segment adjacent thereto is inflated.
[0023]
Then, in step 160, the center of gravity is detected again. In step 170, it is determined whether or not the center of gravity has changed from the center of gravity detected in step 120. If the center of gravity has not changed (nothing), steps 140, 150 Step 160 is executed again. At this time, in the position change control in step 150, when the same control as the previous position change control is performed, control different from the previous position change control may be performed. These need to be determined finely depending on where in the segment the center of gravity is. If there is a change in the center of gravity in the determination of step 170 (if any), the process returns to step 110 and the above-described control is repeated.
[0024]
Further, in the determination in step 170, if the case where there is no change in the center of gravity is repeated several times, it is possible to notify the person or the caregiver by an alarm or the like, though not particularly shown.
[0025]
The flowchart shown in FIG. 4 shows another example of the control executed by the CPU 62. Hereinafter, an example of the control will be described with reference to this flowchart. However, the same portions as those in the above-described flowchart are denoted by the same reference numerals, and description thereof will be omitted.
[0026]
In this control, if the center of gravity detected in step 110 does not fluctuate in the determination in step 115 (none), and if this state continues for a predetermined time in the determination in step 125 (Y), the posture change after step 140 The control is executed. Thus, when the center of gravity of the subject on the bed 20 does not fluctuate for a predetermined time, the position is changed to prevent pressure ulcers.
[0027]
Further, the control shown in FIG. 3 and the control shown in FIG. 4 may be combined so that the position change control after step 140 may be executed when snoring is detected or when the center of gravity does not move for a predetermined time. Things.
[0028]
【The invention's effect】
As described above, according to the present invention, the center of gravity of a subject lying on a bed can be detected, and whether or not the subject has changed his or her postural position due to the change in the center of gravity can be detected. It can be changed. In addition, this can prevent the subject from snoring and pressure ulcers.
[Brief description of the drawings]
FIG. 1A is an explanatory diagram showing an example of a bed on which a body position changing device of the present invention is mounted, in which a load sensor is provided on a leg, and FIG. It is explanatory drawing which showed the example in which was provided.
FIG. 2A is an explanatory diagram showing a segment on a bed, and FIG. 2B is a schematic configuration diagram showing an example of a body position changing device.
FIG. 3 is a flowchart illustrating an example of control.
FIG. 4 is a flowchart illustrating another example of control.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Position change device 2 Leg 3 Frame 4 Sheets 5 Expansion / shrinkage bag 6 Control unit 7 Load sensor 8 Strain sensor 9 Fluid supply device 10 Air pump 11 Air tank 12 Inhalation solenoid valve 13 Discharge solenoid valve 20 Bed

Claims (6)

A postural change device comprising at least a plurality of expansion / contraction bags arranged on a bed and an actuating means for inflating or contracting the expansion / contraction bags,
Position change operation determining means for determining whether the position change is necessary for the subject on the bed according to the condition,
Center of gravity detection means for detecting the center of gravity of the subject on the bed,
The body position change operation determining means, when it is determined that the body position change is necessary, from the center of gravity detected by the center of gravity detection means, expansion and contraction bag determination means to select an expansion or contraction bag to expand or contract,
Position changing means for operating the operating means in accordance with the determination by the expansion / contraction bag determining means;
And determining whether the center of gravity detected by the center of gravity detection unit has changed after the operation of the body position change unit, and determining that the position change has been completed when the center of gravity has changed. Characteristic position changing device. 2. The body position changing device according to claim 1, wherein the center of gravity detecting means, the expansion / contraction bag determining means, and the body position changing means are repeatedly executed until the body position change determining means determines that the body position change has been completed. The body position changing device according to claim 1, wherein the body position changing operation determining unit determines that the body position needs to be changed when snoring of the subject on the bed is detected. The position change device according to claim 1, wherein the position change operation determining unit determines that position change is necessary when the center of gravity of the subject on the bed does not fluctuate for a predetermined time. The body position changing device according to any one of claims 1 to 4, wherein the center-of-gravity detecting means is a load sensor arranged on a leg of the bed. The position change device according to any one of claims 1 to 4, wherein the center of gravity detection device is a strain sensor disposed on a frame of a bed.

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