JPH07163622A - Sleeping device - Google Patents

Abstract

PURPOSE:To make judgement about what action a sleeper such as a cared person or the like is going to take, and perform drive function for assisting the action. CONSTITUTION:A plurality of physical motion detecting means 1 identify a sleeper's physical motion. Also, a physical motion signal so obtained is transmitted to a motion judgement means 6, and when the motion is identified, a signal for a judgement result is transmitted to a control means 8. On the other hand, the lying position of the sleeper is detected with a physical position detecting means 9, and information on the sleeper's physical position is sent to the control means 8. Then, the control means 8 drives a bed device 13 suitably for the sleeper's physical features such as his/her position and size. As a result, a sleeping device with enhanced assist function can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeping apparatus for changing the posture of a patient in a hospital or facility or a sleeping person.

[0002]

2. Description of the Related Art As a sleeping apparatus of this kind, as shown in FIG. 10, when a sleeping person makes a body movement, a body movement detecting means 31 provided in the bedding detects the body movement, and a signal converting means 32. When converted into a body motion signal, the determination means 33 determines, based on the signal, the body motion that occurred when trying to cause the body to wake up, turn over, raise the foot, etc. On the basis of this determination result, the bed apparatus 34 functions as raising the body, changing the body position, raising the foot, and the like.

[0003]

However, the sleeping device of the prior art described above has the following problems.

If the position of the sleeping person's body shifts during sleeping, even if the reclining or body position changing function is driven, if the setting of the driving position is constant, the sleeping person is driven at a position shifted from the body of the sleeping person. In that case, the function is not fully utilized.

Regarding the drive of the bed apparatus, for example, if the back raising function is used, the setting of the drive angle and speed of the backrest portion is constant, and the bed apparatus is always driven with the same setting according to the result of the judgment of the body movement. This means that the sleeper's disability will continue to stay in the same state even if the progression or recovery of the disorder is gradually taking place, thus preventing recovery or, if progressing, adversely affecting the body. It may be burdensome, so it is necessary to adjust the set value.

If the bed is used in a hospital or facility where the users are not all the same sleeping person, it takes time and effort for maintenance for setting and adjusting because the sleeping apparatus is set according to the individual's condition.

A first object of the present invention is to provide a sleeping apparatus capable of driving the set driving position of the bed apparatus according to the human body position even if the position of the body moves during sleeping.

A second object of the present invention is to detect body movements using a plurality of pressure sensors and to detect a body position from a pressure distribution, and to detect both body movements and body positions using only the pressure sensor. It is an object of the present invention to provide a sleeping device that achieves the first object with such a simple configuration.

A third object of the present invention is to detect the contact state between the person and the bedding when the bed apparatus is driven, thereby determining whether the drive is optimal and automatically adjusting the bedtime. To provide a device.

[0010]

In order to achieve the first object of the present invention, a plurality of body movement detecting means provided in the bedclothes, and the movement of the sleeping person based on the outputs of the plurality of body movement detecting means. Of the motion determining means, a body position detecting means for detecting the position of the person on the bedding, a bed apparatus having a plurality of drive units for realizing a reclining function and a body position changing function, and the motion determining means When the determination result is sent, the control means determines the operation of the plurality of drive parts of the bed apparatus based on the output of the body position detecting means and outputs a control signal.

In order to achieve the second object of the present invention, a pressure sensor is used as the body movement detecting means and the body position detecting means.

In order to achieve the third object of the present invention, a contact state detecting means for detecting a contact state between a person and bedding when the bed apparatus is driven, and a drive based on an output of the contact state detecting means. It is provided with adjusting means for varying the operation amount of the section.

[0013]

When the sleeping person moves, the plurality of body movement detecting means provided in the bedclothes detect the movement, the signal converting means converts the movement into a body movement signal, and the output of the signal converting means determines the body of the sleeping person. Determine the type of motion. On the other hand, the body position detecting means detects the position of the human body on the bedding. When the body movement is judged by the movement judging means, the control means decides which position of the body position judged by the body position detecting means to drive the movement, and outputs a control signal. The bed device drives functions such as reclining and posture change by the control signal.

Further, the body movement of the sleeping person and the position on the bedding are detected by a plurality of pressure sensors.

Further, a contact state detecting means for detecting the contact state between the person and the bedding when the bed apparatus is driven is provided, and the operation amount of the drive section of the bed apparatus is automatically changed by the adjusting means based on the output thereof. To do.

[0016]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows a block diagram of a first embodiment of the present invention, and FIG. 2 shows a schematic diagram of the first embodiment.

FIG. 4 shows a schematic view of the sleeping apparatus of the second embodiment. In FIGS. 1 and 2, reference numerals 1a to 1p denote body movement detecting means, which are piezoelectric elements made of polyvinylidene fluoride that can detect vibration, and are flexible tape-shaped sensors. 2 is a signal conversion means, and here is 3
Filters, amplifiers for 4, and integrators for 5 are built in. Reference numeral 6 denotes a motion determination means, which has a body movement pattern storage unit 7 and a comparison unit 8 built therein. Reference numeral 9 denotes a body position determining means, which is provided with pressure sensors 10a to 10b and a pressure distribution measuring means 11. Pressure sensor 10a-10b
Is a strain gauge sensor. Reference numeral 12 is a control means, 13 is a bed apparatus, and the body movement detecting means 1a is provided on the bed apparatus 13.
There is a bed mat 14 in which the pressure sensors 10a to 10b are incorporated.

The operation of the above configuration will be described below. When the sleeping person tries to turn over in the bed apparatus 13 and causes a body movement, the body movement detecting means 1a to 1p detect a vibration on the bedclothes caused by the body movement and a voltage change occurs. Signal conversion means 2
Then, this signal passes through the filter 3 and the amplifier 4, and the integrator 5 converts the amount of vibration due to body movement into a body movement signal. The body movement pattern storage unit 7 of the movement determination means 6 stores a body movement distribution pattern used for discriminating which movement the body movement is attempted to cause from the body movement distribution pattern. When body movement occurs, the comparison unit 8 compares the pattern with the pattern stored in the body movement pattern storage unit 7, selects a pattern that matches or has the highest correlation, and determines the type of motion.

On the other hand, the body position detecting means 9 obtains the pressure distribution by the pressure distribution detecting means 11 based on the pressure signals detected by the plurality of pressure sensors 10a to 10b arranged in a bedding shape, and the pressure distribution of the body is detected. Determine the position. Body position detecting means 9
An explanation of the action of is shown in FIG. 3 and FIG. Figure 3
(A) shows the pressure distribution in the case of lying on the back, and (b) shows the pressure distribution in the case of lying on the left side by isobars. Since the load applied to the bedding includes not only the human body but also bedding such as pillows and comforters, in order to remove this information, the load is large and the part corresponding to the center of the trunk of the sleeping person is moved from the head to the feet. The shape of the sleeping posture of the sleeping person is determined. In other words, an isobar map is created and the shape and straightness of the peaks are connected.
FIG. 4 is obtained by connecting the high-voltage portions obtained from the isobar diagram of FIG. Here, in the case of (a), four points are connected from the head, and the angles θ1 and θ2 formed by the connected lines are calculated. Here, since both θ1 and θ2 are 150 degrees or more, it is determined that the posture is on the back. In the case of (b), five points are connected, so the angle formed by the line connecting the five points is θ3, θ
There are three, 4 and θ5. θ3 and θ4 are 180 degrees or less, and θ5 is 180 degrees or more, forming an S shape. As described above, when there are some bending points and the shape is S-shaped, the posture is determined to be the recumbent leftward posture. If it is an inverted S-shape, it is determined that the person is lying on the right side. The number relating to the angle used for determining the shape can be changed depending on individual differences. In this way, when the sleeping posture is known, the region on which the most pressure is applied is determined to be the waist, with both ends of the straight line connecting the head and the foot. The part is A in FIG. 3A and B in FIG. 3B. The control means 12 receives the information on the body position obtained by the body position detecting means 9, and when the motion judging means 6 judges that it is a motion of raising the body, and sends a signal, it drives the reclining function. To
A signal for activating the bed apparatus 13 is sent to the bed apparatus 13 with the waist position as a fulcrum. In the bed apparatus 13, reclining is driven according to the signal sent by the control means 12. As a result, the sleeping person moves up while being assisted by the bed apparatus 13. Further, when the body position detecting means 9 has the body of the sleeping person at the end of the bedding and the danger of the sleeping person due to the drive of the bed apparatus 13 is considered, for example, the body position is 2 from the edge of the bed.
When the distance is within 0 cm, the drive of the bed apparatus 13 is stopped.

With the above operation, it is determined from the body movement distribution pattern that occurs when an action is made, what kind of action is being made, and the body position detecting means 9 obtains accurate position information of the body of the sleeping person. Thus, the bed apparatus 13 for assisting the movement according to the position of the sleeping body can be driven. As a result, even if the body position of the sleeping person is deviated, or even when one bed is used by a plurality of sleeping persons, the effect of the function of assisting the operation of the bed apparatus according to the physical characteristics can be obtained.

The body movement detecting means is a body movement, that is,
You may use the acceleration sensor etc. which can detect the movement of a body position, the change of a center of gravity, and vibration, a pressure sensor, etc. As a sensor used as a body position detecting means, a pressure sensor, a CCD camera using visible light or infrared rays is used for image recognition, or a sensor for detecting the climate in the bed such as temperature and humidity is used. May be used.

Next, a second embodiment of the present invention will be described. FIG. 5 shows a block diagram of the second embodiment, and FIG. 6 shows a schematic diagram of the second embodiment. This uses the pressure sensors 10a to 10b as the body movement detecting means of the first embodiment. The signal conversion means 2 includes a pressure change amount calculation means 1
5 is built in.

The operation of the above configuration will be described below. Here, when the sleeping person causes body movement, the pressure change detected by the pressure sensor is sent to the signal conversion means 2, and the pressure change amount is calculated by the pressure change amount calculation means 15 to be converted into the body movement amount. It is sent to the motion judging means 6. Here, it is determined from the output pattern of the body motion which motion the body motion was attempted to occur.
Hereafter, the operation is similar to that of the first embodiment.

With the above operation, by using the pressure sensor as the body movement detecting means, the body movement and the body position can be detected at the same time, and the sleeping apparatus can be realized with a simpler structure.

Next, a third embodiment of the present invention will be described. FIG. 7 shows a block diagram in the third embodiment, and FIG. 8 shows a block diagram of the adjusting means in the third embodiment. Here, in the second embodiment, a pressure sensor is provided as the contact state detecting means 16 which also serves as the body position detecting means, and an adjusting means 17 is added. The adjusting means 17 includes
The pre-driving body pressure distribution storage unit 18, the timer 19, the body pressure distribution difference calculation unit 20, the threshold value storage unit 21, the threshold value comparison unit 22, and the adjustment unit 23 are provided.

The operation of the above configuration will be described below. As shown in the first and second embodiments, when a sleeping person tries to wake up and makes a body movement, the body movement is detected, the body position is detected, and the reclining function of the bed apparatus 13 is driven. Then, the pressure distribution measuring means 1 immediately before being driven
Data of body pressure distribution Ppre (Ppre-a,
Ppre-b, Ppre-c, ...) Are stored in the pre-drive body pressure distribution storage unit 18. In the body pressure distribution difference calculation unit 20, the timer 19
The body pressure distribution data Pnow (Pnow-a, Pnow-b, Pnow-c, ...) At that time is taken in at a constant time interval measured by and is stored in the pre-drive body pressure distribution storage unit 18. The difference ΔP = ΣPnow−ΣPpre of the total body pressure from the body pressure distribution data is calculated. A threshold PI is stored in the threshold storage unit 21,
A value corresponding to the reclining angle is stored as the threshold value PI, and the PI corresponding to the drive angle at the time when Pnow is taken in is output. The threshold comparison unit 22 compares the threshold PI with ΔP. Here, when PI> ΔP, the bed device 1 is operated by the timekeeping function of the timer 19.
3 The time ΔT1 from the start of driving can be known. At the same time PI> △
The duration ΔT2 of P is also known.

For explaining the adjusting means 17 at this time, the reclining angle of the bed apparatus and the relationship between ΔP and the reclining angle θ are shown in FIGS. 9 (a), 9 (b), 9 (c) and 9 (d).
Shown in. The PI curve in the figure means a threshold PI according to the reclining angle θ. FIG. 9 (b) is a diagram of a sleeping person who is able to wake himself up after exertion of force at the beginning of the motion of raising the upper body. At angle θ1, △
Although there is an output of P, since it can rise by itself after that, ΔP at the angle θ2 becomes 0 or negative. Further, FIG. 9C is a diagram in the case of a sleeping person whose muscular strength is considerably weakened and cannot easily get up by himself. As shown in FIG. 9B, ΔP does not immediately become 09 (d) or negative, but ΔP becomes 0 or negative at the angle θ2. The diagram shown in FIG. 1 shows a case where the sleeping person's rising motion and the reclining drive are mismatched. In the initial stage of the rising motion, there is an output of ΔP that exceeds the threshold value PI again at the time of the angle θ2, which was raised by itself. The ΔT and the angle θ2 at this time are sent to the adjusting unit 23, and the control for the next reclining drive is readjusted. Change the speed to delay ΔT by 10% until the angle becomes θ2. In addition, the reclining angle is less than 75 degrees, and is reset to an angle θ such that ΔP becomes 0 or negative. The threshold value PI for the value adjusted here is reset, and the threshold value is stored. Stored in the department. In this way, the control means 12 drives the bed apparatus 13 using the control signal adjusted by the adjusting means 17.

Although the pressure sensor is the body position detecting means and the contact state detecting means, in addition to the strain gauge sensor, a contact type pressure sensor such as a pressure sensitive rubber or an electrostatic capacitance type, or a distance between the human body and the bedding is determined. The contact state between the bedding and the human body may be detected by performing image recognition using a CCD camera using a measurable ultrasonic sensor, visible light, infrared rays, or the like.

Due to the above action, the sleeping person can feel his physical condition,
Since the bed device is automatically driven according to the physical strength and the degree of disability, there is no need for caregivers or maintenance. Further, even when the user of the bed apparatus changes, the drive of the bed apparatus can be adjusted according to the user, so that the bed apparatus can be used as a bed apparatus for hospitals, facilities, and rentals.

[0030]

As described above, the sleeping device of the present invention has the following effects.

By measuring the body position, the position of the sleeping person's body can be known, and the bed apparatus can be driven in accordance with the sleeping person's body position. Therefore, the sleeping person can operate without excessive physical burden. Can be done.

Further, the sleeping apparatus can be realized with a simpler structure by using the pressure sensor for detecting the body movement and the body position.

Furthermore, when the bed apparatus is driven, the contact state between the person and the bedding can be detected, and the bed apparatus can be automatically adjusted according to the physical characteristics of the sleeping person and the displacement of the body position during sleeping. Therefore, the physical function can be assisted according to the progress of the disorder and recovery symptoms of the sleeping person in the hospital or facility, which is convenient as a sleeping device.

[Brief description of drawings]

FIG. 1 is a block diagram of a sleeping device according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of the device.

FIG. 3 (a) isobaric diagram of the body position detecting means in the same device in a supine position; and (b) isobaric diagram of the same device in a recumbent leftward direction.

FIG. 4 (a) isobaric connection diagram in the case of supine of FIG. 3 (b) isobaric connection diagram in the case of lying on the left side of FIG.

FIG. 5 is a block diagram of a sleeping device according to a second embodiment of the present invention.

FIG. 6 is an external perspective view of the device.

FIG. 7 is a block diagram of a sleeping device according to a third embodiment of the present invention.

FIG. 8 is a block diagram of adjusting means of the device.

9A is a side view showing the reclining angle of the bed apparatus, and FIG. 9B is a characteristic diagram showing the relationship between the reclining angle and body pressure in the case of a sleeping person who can wake up by himself. (D) The same characteristic diagram when the reclining drive does not match the rising motion of the sleeping person

FIG. 10 is a block diagram showing a conventional sleeping apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body movement detection means 6 Motion determination means 8 Control means 9 Body position detection means 13 Bed device 16 Contact state detection means 17 Adjustment means

Claims (3)

[Claims] 1. A plurality of body movement detecting means arranged in bedding,
An operation determination unit that determines the motion of the sleeping person based on the outputs of the plurality of body motion detection units, a body position detection unit that detects the position of a person on the bedding, and a drive unit that realizes a reclining function and a position conversion function. A bed apparatus comprising a bed device and a control unit that controls the drive unit based on outputs from the motion determination unit and the body position detection unit. 2. The sleeping apparatus according to claim 1, wherein the body movement detecting means and the body position detecting means are pressure sensors. 3. A contact state detecting means for detecting a contact state between a person and a bedding when the bed apparatus is driven, and an adjusting means for varying an operation amount of a drive unit based on an output of the contact state detecting means. The sleeping apparatus according to claim 1 or 2.