JPH07265175A - Air bed - Google Patents

Abstract

PURPOSE:To provide the natural figure for sleeping with the inner pressure suitable for each parts of the human body to be generated naturally when a healthy man lies on the bed and to use it for preventing the bedsore even for a patient. CONSTITUTION:Front and back sheet members 2 and 3 made of a synthetic resin without air permiability and many inner applications 4 are welded. Many separated air rooms 10 arranged horizontally for the human body lying on the bed are serially connected with a constriction part. By sending air from a pump 78 having the constant discharge amount and passing it through the constriction part, the pressure in each separate air room 10 is adjusted to the required value and it is held.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an air bed,
More specifically, the present invention relates to an air bed that replaces a water bed for a good night's sleep, or an air bed that combines a bed for sleep and a bed for preventing bedsores used by patients.

[0002]

2. Description of the Related Art Conventionally, as a bed mat containing a fluid, a hollow bag body capable of holding an air layer of a constant thickness is formed with a non-breathable rubber or vinyl chloride sheet.
When the user himself lies on the bed and operates the controller, when the compressed air is pressed in or out according to the sensation and the elasticity becomes appropriate, the plug is closed to maintain an appropriate air pressure, or a flat bag. A water bed that fills water without pressure and uses a horizontal surface that can be naturally placed by placing it inside a frame has been put into practical use, and although it is not a bed mat, it has two sheet members, front and back. A wave-type air mat for nursing care that adheres in a number of parallel lines, forms two air chambers with air spaces between them, and alternately feeds air from a small pump to levitate the patient and prevent bed sores. Is put to practical use.

[0003]

Problems to be Solved by the Invention By the way, when compressed air is press-fitted or withdrawn to reach an appropriate pressure, a solenoid valve or the like is used to close the plug and maintain that pressure. Therefore, it is necessary to operate while lying on the bed, and if you operate by standing on the side and confirming with your palm or sitting on the bed, the pressure changes when you lie down, so I have to readjust it. Further, in the case of an unconscious patient, since the caregiver operates it, it cannot be determined whether or not the support pressure is appropriate. In short, the conventional air bed is intended to adjust the pressure by substituting the spring mat, which is different from the idea and purpose of the present invention. In addition, since it is in a tightly plugged state, even if a small hole like a needle sticks out, it will wither in a few minutes, so there is a big drawback that it becomes unusable.

The water bed has been widely used in Europe and the United States due to its good usability, and has recently been used for a prize in Japan. However, water alone is very heavy at 200 to 500 kg, and the installation is done by a trader. Since it has to be done and it is cold, it has to be constantly heated with a surface heater of about 250 watts, and it cannot be used for anything other than horizontal use, for example, it cannot be used for gadgets. However, the fact that the buttocks sink too much, especially the risk of water leakage, is a major drawback. There are many ideas to remedy these, which are expensive and therefore expensive.

Further, the wave type air mat used as a nursing care product for severely ill patients is, in principle, 30 to 40 m / mH in which a cylindrical air cell is arranged laterally with respect to the human body.
Inflate with air pressure of g, and if left as it is, the capillaries will be compressed and blood circulation will be blocked, so expansion and contraction will be repeated alternately at intervals of 10 minutes, but intermittently. Also circulates the blood flow to prevent bed sores, but the patient feels like it is lying on logs with a slight elasticity and at intervals, so the feeling of use is not very good. Therefore, it is not used in mild patients,
When the caregiver became so severe that he could not endure the effort of turning over day and night, he began to use a wave-type air mat as recommended by his doctor.

Generally, the pressure of human capillaries is 30 m / mH.
Although it is in the g-position, when a water bed is used, there is a track record that it is difficult for a caregiver to get a bed slip without turning over. Since the surface pressure of water (water pressure in the upper part of the bag) when a person rides on the water bed is about 14 m / mHg,
If an air bed that can be supported with a pressure lower than that can be developed, even if the caregiver does not turn over, there is no need for an automatic turn-over bed or an automatic turn-over mat, and the person can lie still on such an air bed. It is obvious from the example of the waterbed that the bed does not cause bed sores.

[0007] A single air chamber with a large spring mat has been put on the market, but it can only press in and out air, and it is mainly used for leisure outdoors and even for a short time. The body parts are so painful that it cannot be used as a bed bedding.

The present invention has been made in view of the current situation of such an air mat and a water bed, and the object thereof is to lie on the side of the water bed, which is the most characteristic of the water bed, in which air, which is the same fluid, is used instead of water. Supports with a low internal pressure that naturally occurs when doing, and with a support pressure most suitable for each part of the human body, a natural sleeping posture can be obtained, and it can be used not only for healthy people but also for preventing bedsores of patients In addition, in the case where a patient becomes serious and the blood pressure drops, a new type of air bed that can be used as a wave bed only by electrical switching without moving the patient is provided. It is in.

[0009]

[Means for Solving Problems] In the case of a water bed, it is sufficient to inject a necessary amount of water into a flat bag without a middle gland and place it in a frame. However, using a bed mat When we are going to make, since air has no weight,
If the bag is constructed by closing the periphery with two sheet members on the front and back sides, it will become a hollow sphere when inflated and it will not be useful,
The middle gusset as an appropriate shaping band is welded between the two sheet members on the front and back sides so that the pressurized air is enclosed so that it swells like a futon. Lateral direction with respect to the human body, the end of the middle gland is made longer than the conventional general method, and when the peripheral edges of the front and back sheet members are welded, they are sandwiched and welded at the same time. Each air chamber surrounded by each middle gusset is formed independently. You can use this independent air chamber by directly connecting it to the outside, or you can open a small hole in a specific one of the middle gland to communicate between adjacent air chambers, divide it into appropriate blocks, and communicate these blocks outside, It is used for each block of the head, chest, abdomen, buttocks, thighs, and lower limbs (heels) when a person is supine. In either case, the air is full, but the pressure should be zero (the water in the waterbed should be full without any pressure), but this should be taken into consideration when capturing the condition. It is extremely difficult to do. In more detail, even if pressurized air is injected into the bag body, the pressure in the bag body does not rise immediately due to diffusion in the bag body, and as shown in FIG. 13, the state of zero pressure continues, The total volume of the bag rises for the first time from the point a where the air is filled, but the rising curve is extremely gentle at first, so the human feel, the water column,
Even with a micro pressure gauge such as a mercury column, it can be judged only at a point b slightly elevated from the point a. However, during this time, a considerable amount of air is injected, and the internal pressure generated when a person rides on this is, for example, 14 m / mHg at point a, but 20 at point b.
There is a large difference from the m / mHg position.

Considering the equilibrium state when a person is supine on the waterbed, the depth of depression depends on the weight and area of the human body at that portion. On the other hand, the water pressure due to the sunk depth and the lateral tension of the outer fabric counteract the weight as a force to float by sinking the body and maintain balance.In the case of an air bed, Under the same conditions (for example, the internal pressure is 14 m / mHg), the depression of the buttocks is much larger than that of the water bed under the same conditions. Was reduced to relatively compensate for the fall of the buttocks.

As a result of experiments, the inventor of the present invention found that the optimum supporting pressure for each part when used as a substitute for a water bed was as follows: buttock 14 m / mHg, chest abdomen 11 m / mH
g, the head and lower limbs (heel) of 5 m / mHg, which are within a very narrow range of ± 2 m / mHg, respectively, and it can be clarified that the supporting pressure is maintained by the following method in the present invention. I was able to. That is, a diaphragm pump of about 5 watts usually has two stations and has separate discharge ports, each of which has a maximum pressure of 100 m / mHg and a discharge rate of about 2.5 l / min. Head and thighs-divided into two systems of lower limbs (heel), connect outlets, connect all blocks in series at 5 l / min, and connect each block from high support pressure block to low support pressure block And let it pass. A three-way cock is provided at the inlet of each block, an L-shaped joint with a constriction is provided at the outlet, or a self-regulating discharge valve is provided, and a semi-fixed constriction is provided at the L-joint with a constriction to allow air to flow through. By doing so, if the pressure reducing action is exerted, and the narrowed portion is fixed so that the internal pressure of each other block becomes the above-mentioned value when the adjustment value of the automatic pressure adjusting and discharging valve of the terminal is set to 5 m / mHg, After that, the optimum supporting pressure can be obtained at all times, except when there is no person on board, a light person on board, or a heavy person on board, except for an excessive time of 2-3 minutes. According to the experiment, the length is 20 m at the flow rate of 5 l / min.
/ M, about 3 m / mHg at the narrowed part of the small diameter hole of 2 m / m
When the connecting pipe is used for a long time, there is almost no pressure drop at the inner diameter of 6 m / m at the above flow rate, but there is a pressure drop of 2.5 m / mHg per 1 m at the inner diameter of 4 m / m. When it is used as a substitute for a stenosis, it is necessary to take measures such as increasing the inner diameter of the stenosis or not using a stenosis screw tube. Also, 2.5l /
In case of flow rate of min, connecting tube 10cm with inner diameter 2m / m
A pressure drop of about 2 m / mHg was obtained. If you want to make the hardness like a spring mat according to your preference, simply turn the adjusting screw of the self-adjusting pressure discharge valve of the terminal to the predetermined position to remove the support pressure of the other blocks except when they are excessive (there are characteristics of the pump. , But it can be raised with almost the same pressure difference, and conversely, it can be lowered like a water bed. That is, the air pressure of each block can be raised or lowered with one touch while maintaining a uniform difference.

Also, the three-way cock at the entrance of each block enables connection between the blocks, blockage, and rapid release of the pressurized air in each block, so that it is convenient for measures against power failure and storage. . However, if a three-way cock is attached, abnormal pressure increase in the air bag may occur due to erroneous operation. Therefore, an overpressure release valve was provided to prevent overpressurization.

In the present invention, when the patient's symptom becomes serious and the blood pressure is abnormally lowered, the flat air mat may not be able to cope with the case, so that the flat air mat is usually used. When used, the patient was allowed to move to the wave type only by electrical switching without moving the patient when the above-mentioned symptoms occurred. That is, each independent air chamber is connected to the outside every other line to divide into two systems,
Air is always supplied to both systems, and 10
If the air of each system for 3 to 5 minutes is alternately discharged every 20 minutes by a solenoid valve or the like, the supporting area can be made larger than that of the conventional wave type air mat, and it can be supported with a low supporting pressure. , Thinking that it can also serve as an air mat for the prevention of bed sores for serious patients who are kind to patients, we will carry out experiments and prototypes to complete an air bed that can cover spring mats, air beds, wave type mats, etc. did it.

The air bed according to the present invention solves the above problems and is as follows. That is, a large number of independent air chambers that are laterally connected to the human body by a sheet material such as a non-breathable synthetic resin are connected in series with a constriction portion, and air is supplied from a pump having a constant discharge amount to constrict the constriction. It is characterized in that the pressure in each independent air chamber is adjusted to a predetermined value and held by flowing through the section, and the multiple independent air chambers are divided into several blocks, and in between. A feature is that a three-way cock is provided to connect, block, and discharge the pressurized air of each block.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings and its operation. First, with reference to FIG. 1 to FIG.
In these figures, the air bag body 1 is a vertically long quadrangle in plan view suitable for a person to lie down, and generally has a length of 2 m, a width of 1 m, and a thickness (thickness when inflated). The air bag 1 has a length of 15 cm and is formed of two sheet members 2 and 3 made of synthetic resin or the like having no air permeability and a middle gusset 4 as a predetermined number of shaping bands. Seat members 2, 3
And the inner gusset 4 is a soft vinyl chloride sheet material or the like, and each of the inner gussets 4 has a long distance between both ends of the long side, as shown in FIGS. 5 and 6 are welded to the sheet members 2 and 3 by high frequency bonding. Next, a three-way cock, an L-shaped joint with a narrowed portion, and a self-regulating pressure discharge valve, which will be described later, are welded to the holes 7 that have been pre-drilled in the front sheet member 2, and then the middle gusset 4 is arranged. The peripheral portions 8 and 9 of the front and back sheet members 2 and 3 are polymerized and welded by high-frequency adhesion while sandwiched in this state, and the air bag body 1 having a large number of air chambers 10 is formed. The air bag body 1 is divided into each block of the head, thoracoabdomen, buttocks, thighs, and lower limbs (heels) through a non-perforated middle gland 4, and the middle gland 4 in each block is divided into blocks. The small holes 11 are alternately formed on both sides of the human body 100 in the supine direction so that the air chambers 10 are in communication with each other. First air chamber 10 in the head block and fourth air chamber 1 in the lower limb (heel) block
As described above, the automatic pressure regulating discharge valve 20 is welded to the hole 7 of the front sheet member 2 at the portion corresponding to 0.

As shown in FIGS. 4 and 5, the automatic pressure regulating discharge valve 20 is provided with a frame body 21 made of hard plastic, and the frame body 21 is provided with a screw portion 23 on its inner peripheral surface. Further, a spring adjusting screw having a cylindrical portion 22 having a valve seat 24 formed on the inner circumference of the lower portion, and having a screw portion 26 screwed into the screw portion 23 and a spring receiving portion 27 in the cylindrical portion 22. 25 is airtightly screwed through an O-ring 28, and a tubular rod 29 is inserted inside. The tubular rod 29 has a through hole 30 in the axial center thereof, a spring seat 31 on the upper outer circumference, and a valve 32 engaging with the valve seat 24 on the lower outer circumference of the spring seat 31. It is provided with a screw part 3 at the tip.
Have three. A spiral spring 34 is interposed between the spring receiving portion 27 of the spring adjusting screw 25 and the spring seat 31 of the tubular rod 29, and the tubular rod 29 has a diameter between the tubular rod 29 and the lower end opening of the cylindrical portion 22. Is provided movably up and down with a gap 35 of about 1 m / m difference. Threaded portion 33 of tubular rod 29
Includes a flat washer 36 and a rubber film (diaphragm) 37.
The central portion of the rubber film 37 is inserted and screwed by a nut 38, and the outer peripheral edge of the rubber film 37 is fixed by a screw 40 or the like via a rubber film retainer 39 having an opening at the peripheral edge of the lower end opening of the frame 21. ing. Further, a skirt 41 which is made of soft vinyl chloride and has a brim portion 42 for welding to the front sheet member 2 of the air bag body 1 is tightly bound to the outer periphery of the frame body 21, and further on the upper surface of the frame body 21. Is an L-shaped pipe connection portion 43
Is provided.

The automatic pressure-adjusting discharge valve 20 having the above structure operates as follows. That is, the air chamber 10 in the air bag body 1
When the air pressure rises, the same pressure as the front and back sheet members 2, 3 is also applied to the rubber film (diaphragm) 37, gradually pushing up the spring 34, and a gap is created between the valve 32 and the valve seat 24. The pressurized air of No. 2 flows through and is discharged into the atmosphere as shown by the solid arrow in FIG. Since this flow path is relatively narrow, it acts as a kind of fluid resistance, and the pressure inside the bag body 1 is kept constant by the gap between the valve 32 and the valve seat 24.

As shown in FIG. 1, the fourth air chamber 10 of the head block, the thoracoabdominal block, and the buttocks block and the first of the thigh block and the lower limb (heel) block in the air bag body 1 are shown. In the hole 7 of the front sheet member 2 corresponding to the air chamber 10 of the three-way cock 5 as described above.
0 is welded.

As shown in FIGS. 6 to 8, the three-way cock 50 includes a hard plastic outer cylinder body and an inner cylinder body,
It has a skirt made of soft vinyl chloride. Outer cylinder 51
Has a connection pipe portion 52, a discharge pipe portion 53, and a bottom opening portion 54, and the inner cylindrical body 55 has a communication hole 57 that communicates with the handle portion 56 and the flow passage of the connection pipe portion 52 or the flow passage of the discharge pipe portion 53. The skirt body 58 has a collar portion 59 for welding to the front sheet member 2 and a mounting portion 60 for the outer cylinder body 51. Then, the inner tubular body 55 in the outer tubular body 51 has its grip portion 56 extended outward and its communication hole 57 is in communication with the flow paths of the respective pipe portions 52, 53 to prevent slipping out. Means (External cylinder 51
Engagement of the inner peripheral groove 61 of the inner peripheral groove 62 of the inner cylindrical body 55)
And a skirt body 58 is attached to the outer periphery of the lower end portion of the outer cylinder body 51 with the attachment portion 60 tightly bound thereto, and the three-way cock 50 has an outer cylinder body with its handle portion 56. By rotating the body 51 by 90 degrees, the air circuit communicates with the inside of the air chamber 10 of the air bladder 1 and the outside air, and the air in the air chamber 10 is discharged.

As shown in FIG. 1, a front sheet of the air bag 1 corresponding to the first air chamber 10 of the thoracoabdominal block and the buttocks block and the fourth air chamber 10 of the thigh block. The L-shaped joint 70 with a narrowed portion is welded to the hole 7 of the member 2 as described above.

The L-shaped joint 70 with a narrowed portion is made of a hard vinyl chloride resin containing 15 parts of a plasticizer, and as shown in FIGS. 9 and 10, an L-shaped joint 70 having a collar portion 72 and a screw tube portion 73. The mold joint portion 71 and a knurled constriction screw tube 74 having a small diameter hole 75 as a constriction portion that is detachably screwed to the inner peripheral threaded pipe portion 73 of the joint portion 71 are provided.
Is welded to the peripheral edge of the hole 7 of the front sheet member 2 with its flange portion 72, and the constriction screw pipe 74 and the connecting pipe portion 52 of the three-way cock 50 are connected by a flexible resin pipe 76 to connect each block. While communicating with each other, a pressure difference is generated between the blocks when the pressurized air flows through.

The self-regulating discharge valve 20, the three-way cock 50, and the L-shaped joint 70 with a constricted portion having the above-described structure are arranged and welded in the positional relationship shown in FIG. 1, and a resin pipe 76 or the like is connected between them. Each automatic pressure regulation discharge valve 20
An exhaust pipe 79 is connected to each of the connecting portions 43, the grip portion 56 of the three-way cock 50 is placed on the connecting pipe portion 52 side, and the overpressure release valve 77 is provided to each of the three-way cocks 50 in the buttocks block and the thigh block. 2 small pumps via
8 are connected. Then, air is supplied by the small pump 78, and the automatic pressure adjusting and discharging valve 20 in the lower limb (heel) block is adjusted to adjust the supporting pressure of the head block and the lower limb (heel) block to 5 m / mHg, respectively. The pressure of each of the other blocks becomes a predetermined supporting pressure due to the action of the small diameter hole 75 as the narrowed portion of the L-shaped joint 70 with a narrowed portion, but if it is different from this, another narrowed portion having another small diameter hole is provided. Screw tube 7
It should be renovated as 4. Normally, it is used in this state (see FIG. 12), but when there is a risk of power failure due to stormy weather, etc., the three-way cocks 50 are closed (the handle portion 56 is positioned at a right angle to the connecting pipe portion 52). ) You just put it. Since the automatic pressure adjusting and discharging valve 20 acts as a check valve, the pressure of each block can be maintained as it is. Even in this case, in order to prevent wetting, air may be sent directly from the pump 78 to the bottom of the bed. Also, the three-way cock 50
In order to prevent abnormal boosting due to malfunction of
An overpressure release valve 77 in which a small hole is formed at a right angle on the shaft of a hard pipe and a rubber tube is fitted may be attached near the discharge port of the above.

Next, a second embodiment will be described with reference to FIG. 11 in which parts corresponding to those in FIG. The present embodiment is an air bed that can be moved from a flat bed to a wave-type bed only by electrical switching without moving the patient when the patient's condition changes. More specifically, as in the first embodiment, the front and back sheet members 2 and 3 and the predetermined number of middle gussets 4 form an air bag body 1 having a large number of air chambers 10 that are independent in the lateral direction.
One L-shaped joint 80 is welded to the front sheet member 2 on one side of the human body 100 in the supine direction at 0, and the second air chamber 10 of the head block and the lower limb (heel) are further welded. There is another L in the first air chamber 10 of the block
The mold joint 80 is welded, while the first air chamber 10 of the head block and the second and third of the lower limb (heel) block are attached to the front sheet member 2 on the other side of the human body 100 in the supine direction. The automatic pressure regulating discharge valve 20 is welded to the air chamber 10, and the head block, thoracoabdominal block and buttocks block
The three-way cock 50 is welded to the fourth and fourth air chambers 10,
Furthermore, the first and second air chambers 10 of the thoracoabdominal block and buttocks block and the third and fourth air chambers 10 of the thigh block
An L-shaped joint 70 with a constriction is welded to the lower limb (heel)
There are two L-shaped joints 80 in the fourth air chamber 10 of the sub-block.
Is welded. Then, as shown in FIG. 11, each air chamber 10 is divided into two systems shown by a solid line and a dotted line by connecting external connecting pipes 81 and 82. The three-way cock 50 in the buttocks block is connected to the two air pumps 78 via the control device 83 and the overpressure release valve 77, and is also connected to the power switch 84 of the air pump. Then, the air pump 10 is continuously fed from the three-way cock 50 through the two pumps 78 through the control device 83,
When the air is not supplied, the pressurized air of the system is discharged from the three-way solenoid valve in the control device 83. At this time, the pressurized air from the pump 78 is released from the overpressure release valve 77, and the pump 78 is not overloaded, so that the amount of air in other systems is not reduced. In addition, the automatic pressure regulation discharge valve 20 is in the lower limb (heel).
It is located at the part where the two systems of the head block (the second chamber and the third chamber) and the two systems of the head block are merged (the first chamber). And the measures taken to adjust the overall support pressure with one touch. For example, if the automatic pressure adjusting and discharging valve 20 of the terminals of the two systems is adjusted and placed at 5 m / mHg and the automatic pressure adjusting and discharging valve 20 of the head block is adjusted to 10 m / mHg, the supporting pressure of each part block is 10 m / m. A value obtained by adding the pressure reduced by each L-shaped joint 70 with a constriction portion to mHg, and the automatic pressure regulating discharge valve 20 adjusted to 5 m / mHg of each system terminal is the check valve of the system on the discharge side. To work as. The function and effect of the narrowed portion can be obtained in the same manner by forming a small hole having a diameter of about 3 m / m in the middle gusset 4 of the air bag body 1 instead of the L-shaped joint with the narrowed portion.

[0024]

As described above, the air bed according to the present invention is very natural and comfortable to use when compared with a spring bed, a conventional air bed or a water bed when the person is in a supine or lying position. It can be used to prevent bedsores unless it is a serious patient. For bedridden sick people, since the bed of the present invention that can be transferred to the wave type bed from the beginning is used and the electric switching operation is performed as necessary, the wave type bed can be transferred,
It is convenient. One of the essential parts of the present invention is an automatic pressure regulating discharge valve, a three-way cock, an L-shaped joint with a narrowed portion, etc., which is cheaper than its utility and looks like a connecting pipe, but like a spring mat. It is housed in a cloth bag and is normally untouchable. Also, even if a hole is opened in the bag that is a fatal defect in the conventional air bed or water bed, there is no problem except when there is a power outage, and which block is to be found if the three-way cock is closed Since it can be easily identified, it does not take time to repair.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a first embodiment.

FIG. 2 is a partially omitted cross-sectional view showing a welded state of the front and back sheet members and the middle gusset in the process of forming the air bag body.

FIG. 3 is a partially omitted cross-sectional view of the air bag in an inflated state.

FIG. 4 is a plan view of an automatic pressure regulation discharge valve.

FIG. 5 is a cross-sectional view of the automatic pressure-adjusting discharge valve in a state of being welded to the front sheet member.

FIG. 6 is a plan view of a three-way cock.

7 is a cross-sectional view taken along the line AA of FIG.

8 is a cross-sectional view taken along the line BB of FIG.

FIG. 9 is a plan view of an L-shaped joint with a narrowed portion.

10 is a C- of FIG. 9 in a state of being welded to a front sheet member.
It is sectional drawing which followed the C line.

FIG. 11 is a schematic plan view showing a second embodiment.

FIG. 12 is an explanatory diagram of a support pressure state of each block in a supine state.

FIG. 13 is an explanatory diagram showing a relationship between an air bag internal pressure and an air supply amount in an air bed.

[Explanation of symbols]

 1 Air bag body 2 Front sheet member 3 Back sheet member 4 Middle gusset 10 Air chamber 20 Automatic pressure adjusting discharge valve 50 Three-way cock 70 L-shaped joint with constriction 78 Air pump

Claims (2)

[Claims] 1. A large number of independent air chambers, which are laterally connected to a human body by a sheet material such as a synthetic resin having no air permeability, are connected in series with a narrowed portion, and are fed from a pump having a constant discharge amount. An air bed characterized in that the pressure in each independent air chamber is adjusted to a predetermined value and held by being evacuated and flowing through the narrowed portion. 2. A large number of independent air chambers laterally connected to a human body by a sheet material such as a synthetic resin having no air permeability are divided into several blocks, and three-way cocks are provided between them.
An air bed characterized by a structure in which pressurized air in each block is connected, blocked, and released.