CA1247263A - Lying down support comprising a plurality of inflatable cushions and an improved pressure measuring and control system - Google Patents
Lying down support comprising a plurality of inflatable cushions and an improved pressure measuring and control systemInfo
- Publication number
- CA1247263A CA1247263A CA000460032A CA460032A CA1247263A CA 1247263 A CA1247263 A CA 1247263A CA 000460032 A CA000460032 A CA 000460032A CA 460032 A CA460032 A CA 460032A CA 1247263 A CA1247263 A CA 1247263A
- Authority
- CA
- Canada
- Prior art keywords
- cushions
- valve
- pressure
- bed
- branch ducts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Invalid Beds And Related Equipment (AREA)
Abstract
ABSTRACT
A lying-down support or bed mainly comprises a bottom plate and a plurality of inflatable cushions supported by the plate and connected through a common feed duct with a pressure source. Each cushion or a group of cushions is substantially gastight and is connected through a branch duct with the common duct.
Each branch duct is provided with a controlled valve, in order to maintain the desired pressure in each cushion solely through the controlled valve. A
computer is connected to a pressure sensor located in the common feed duct and controls the main valve, a relief valve and valves in each of the branch ducts.
If the relief valve is open, gas will be exhausted from those cushions connected to the branch ducts whose valves are also open. If the relief valve is closed, pressurized gas is supplied through a pressure reducing valve and an open main valve to the branch ducts and to the cushions whose-valves are also open.
A lying-down support or bed mainly comprises a bottom plate and a plurality of inflatable cushions supported by the plate and connected through a common feed duct with a pressure source. Each cushion or a group of cushions is substantially gastight and is connected through a branch duct with the common duct.
Each branch duct is provided with a controlled valve, in order to maintain the desired pressure in each cushion solely through the controlled valve. A
computer is connected to a pressure sensor located in the common feed duct and controls the main valve, a relief valve and valves in each of the branch ducts.
If the relief valve is open, gas will be exhausted from those cushions connected to the branch ducts whose valves are also open. If the relief valve is closed, pressurized gas is supplied through a pressure reducing valve and an open main valve to the branch ducts and to the cushions whose-valves are also open.
Description
- 2 - ~ %47263 The invention relates to a lying-down support or bed mainly comprising a bottom plate and a plurality of inflatable cushions supported by said plate and connected through a common feed duct with a pressure source.
A lying support of this kind is particularly suitable for persons obliged to stay in bed for a long period, which involves the hazards of decubitus. Known lying-down supports for preventing and healing decubitus satisfying the requirements comprise air cushions arranged in sections in a transverse direction. A specific property of these cushions is that throu~h pores and seams they permit air to escape into the atmosphere in order to keep the patient's skin dry. A
drawback of such a system is that the escaping air may contain wound damp which gives rise to unhygienic conditions. Moreover, the air-conditioning system, if any, in the patient's room may become disturbed.
hith the known lying supports the pressure in the air cushions is set with the aid of a measuring and co~trol-system. This involves the following inconveniences: when the recumbent person changes his position, the pressure in each of the cushions has each time to be reset; in the event o~ damage to one or more air cushions so much air may escape into the atmosphere that the supply becomes insufficient and the p~operties of the lying support with regard to the prevention of decubitus are lost.
According to the invention, there is provided a bed 2~ comprisin~ a bottom plate and a plurality of inflatable cushions supported transversely on said bottom plate along the length of the bed and cu~ulatively definin~ the body-supporting surface of the bed, said cushions bein~ substantially gastight and means for maintaining gas under pressure internally of said cushions, said means comprisin~
_ 3 _ ~247~63 a gas pressure feed source; a co~mon feed duct connected to said Eeed source; a main valve in said common feed duct; a plurality of branch ducts connected downstream of said main valve to said co n feed duct and connected to distribute gas from said ccmmon feed duct to said inflatable cushions; a valve in each of said branch ducts whereby different ones of said cushions may be maintained at different pressures by isolating at least some of said branch ducts from each other and a relief valve in said common feed duct downstream of the main valve; a pressure reducing valve in said ccmmon feed duct for controlling the pressure of gas supplied by said feed source to said branch ducts; a pressure sensor in said common ~eed duct; and a computer being connected to said pressure sensor and for controlling said main valve, relief valve and valves in each of the branch ducts, such that if said relief valve is open, gas will be exhausted Erom those cushions connected to branch ducts whose valves are also open and if said relief valve is closed, pressurized gas is supplied through said pressure reducing valve and open main valve to the branch ducts and to those cushions whose valves are also open, the cc~puter being programmed such as to maintain the pressure in the cushions, and in the event of a change of position oE the patient, to set a new pressure ratio in the cushions.
By regular check of the pressure in each cushion or a group of cushions the control of the valve may take place fully auto~atically so that at any instant the pressure can be maintained~ In the event o~ a position change oE the patient, a previously introduced pro~ramme can be introduced so that the new pressure ratios in the cushions can he very rapidly set.
In one embodiment the common feed duct includes a controlled main valve and is connected at a point aEter the main valve with a controlled relief valve. By this control all cushions can be very rapidly provided with pressurized air or they can be separately or groupwise inflated or emptied.
In a preferred embodiment the common feed duct is provided with a pressure sensor.
In order to permit the patient to assume more than one recumbent pOSitiOIl~ a plurality of cushions are united into a section, which is supported by a carrying plate adjustable in a direction of height. In this way a sitting position can be obtained, which has in addition a centering effect on the patient on the bed so that also in a position change the correct pressure is automatically exerted on the correct place of the body.
In the preferred embodiment a pneumatic lifting means is arranged between each carrying plate and the bottom plate, which means is connected through a branch duct including a controlled valve with the commcn feed duct. In this way the pressure ratios with respect to the lying and sitting positions respectively are automatically obtained.
2~ In order to avoid the notorious, undesirable wave motion which can be particularly troublesome to a patient, each air cushion is embedded in a U-shaPed support of a foam substance. This support provides in addition a lateral support, which facilitates getting in and out of the bed.
If the air pressure should drop-off unexpectedly causing the cushion to deflate, ~he ~oam-support will act like a normal mattress so enhancing safety for the patient.
~ 5 ~ ~2~7263 In order to ensure optimum flexibility of the various cushions relative to one another, the width of the air cushion is equal to that of the U-shaped support. This facilitates in addition cleaning of the lying support.
The invention will be described more fully with reference to a preferred embodiment. The drawing shows in:
Fig. 1 is a perspective view of the bottom plate with carryinq plates adjustable in the vertical direction;
Fig. 2 is a perspective view like Fig. 1 of the air cushions with u-shaPed supports adapted to be deposited on the carrying plates of Fig. l; and Fig. 3 is a schematic survey of the pneumatic control-system for the lying-down support shown in Fig. 1 and 2.
The lying-down support comprises a base part, elements embedding the air cushionst ai~ cushions, hoses connecting the air cushions (or groups-of air cushions) with the pressure measuring and control-system and one or more separation covers holding together the air cushions and the elements embedding the same.
Fig. 1 illustrates an embodiment of the base par~. This base part includes a cover 1 holding carryin~ plates 2, the longitudinal dimensions of which largely correspond to the length of the lcwer legs, the upeer legs, the pelvis and the remaining upper part of the human body. Lifting bellcws 3 are located below these carrying plates 2. ~y pumping air into these bellows various sitting positions as well as ~5 other positions ~or the patient can be obtained. A botto~ plate 4 is arranged below these lifting bellows 3 and provides a stable substrate for these bell~s.
- 6 - ~ % ~7~63 Fig. 2 shows elements embedding the air cushions, the air cushions, and hoses connecting the air cushions (or groups o~ air cushions) with the measuring and control-system of the separation cover or covers. The air cushions 5 are embedded, for example, in foam rubber blocks 6, which are connected in turn tfor example glued) to the base part 7.
The standing rims 8 of the relatively stiff foam blocks 6 constitutes rigid side rims left and right of the bed. These side rims facilitate gettin~ in and out of the bed and can furthermore prevent the patient from siiding out of the bed.
Each air cushion is provided on one side with a hose 9 for connection to the pressure measuring and control-system~ The pressure measuring and control-system may be arranged in a housing below or at the side of the bed.
In the embodiment shown in Fig 2 the hoses ~ are guided through the channels lQ towards the side of the lying-dcwn support and then groupwise interconnected by using a collectin~ block 11. In this way ~roups of air cushions can be formed. From each collectin~ block 11 a single hose 12 passes towards the pressure measuring and ~0 control-system. As an alternative each hose 9 may be len~thened and extend up to the pressure measuring and control-system, after which the yroups are formed.
The air cushion 5 and the foam rubber block 6 can be held to~ether by a cover. It is not necessary to provide each ccmbination of cushion and foam rubber block with a separate cover. The construction t' _ 7 _ ~2~72~3 of the cover 13 from a single piece of material has an advanta~e in that ~utters 14 are formed between the air cushions for collectin~ any incontinency moisture, detergents and so on and conductin~ the same away towards the side of the lyin~-down support.
In order to protect the bed frame against soilin~ and to cover the hose 9, 12, flaps 15 may be provided on the left and right-hand side of the bed.
The pressure measuring and control-system is shown in Fig. 3.
It is desi~ned so that an expert can set for each patient and for each position of the body the pressures in the separate air cushions (or in the separate groups of air cushions) and l;fting bellows. The pressure sequences are then stored in a camputer memory and then they can be set for each body position by the nurse or the patient himself.
The operation of the pressure measurinq and control-system will now be described. Compressor 16, stock vessel 17, pressure switch 18, and adjustable reducin~ valve 19 constantly offer pressurized air of 1 to 2 atms. to the input of valve 20. When the pressure has to be raised in one of the liftin~ bellows or in one of the air cushions, valve 20 as well as one of the valves 21~ 22 or 23 open. If the pressure has to be lowered in one of the liftin~ bellows or in one of the air cushions, valve 24 as well as one of the valves 21, 22 or 23 open.
~f the pressure has to be measured in one of the liftin~
be~lows or in one of the air cushions, all valves are closed with the exception of th valves 21t 22 or 23. The computer obtains the pressure information from the pressure sensor 25.
The ahove-~entioned ~ma~netic) valves are actuated by the micro-computer when:
- 8 - ~Z47263 - 1. The patient or the nurse inform the micro-computer 2h of a change of body position and the computer states that the pressures of the lifting bellows or air cushions associated with the new position differ from the pressures associated with the earlier position; the "correct" pressures are - as stated above - stored by the expert in the computer memory.
2. The computer states during a fully autcmatic, periodic check, that the pressures of the lifting bellows or air cushions differ from the corresponding pressures stored in the memory.
0 Thanks to the above-described measuring and control-system the lying-down support can match patients of hi~hly different body lengths and various recumbent positions, since ~iven cushions can be without pressure for short parts of the body. Centerin~ of the patient takes place automatically when he is brou~ht into a sitting position, in which case the pelvis is brought to the pelvis-support.
, . . 0 S
A lying support of this kind is particularly suitable for persons obliged to stay in bed for a long period, which involves the hazards of decubitus. Known lying-down supports for preventing and healing decubitus satisfying the requirements comprise air cushions arranged in sections in a transverse direction. A specific property of these cushions is that throu~h pores and seams they permit air to escape into the atmosphere in order to keep the patient's skin dry. A
drawback of such a system is that the escaping air may contain wound damp which gives rise to unhygienic conditions. Moreover, the air-conditioning system, if any, in the patient's room may become disturbed.
hith the known lying supports the pressure in the air cushions is set with the aid of a measuring and co~trol-system. This involves the following inconveniences: when the recumbent person changes his position, the pressure in each of the cushions has each time to be reset; in the event o~ damage to one or more air cushions so much air may escape into the atmosphere that the supply becomes insufficient and the p~operties of the lying support with regard to the prevention of decubitus are lost.
According to the invention, there is provided a bed 2~ comprisin~ a bottom plate and a plurality of inflatable cushions supported transversely on said bottom plate along the length of the bed and cu~ulatively definin~ the body-supporting surface of the bed, said cushions bein~ substantially gastight and means for maintaining gas under pressure internally of said cushions, said means comprisin~
_ 3 _ ~247~63 a gas pressure feed source; a co~mon feed duct connected to said Eeed source; a main valve in said common feed duct; a plurality of branch ducts connected downstream of said main valve to said co n feed duct and connected to distribute gas from said ccmmon feed duct to said inflatable cushions; a valve in each of said branch ducts whereby different ones of said cushions may be maintained at different pressures by isolating at least some of said branch ducts from each other and a relief valve in said common feed duct downstream of the main valve; a pressure reducing valve in said ccmmon feed duct for controlling the pressure of gas supplied by said feed source to said branch ducts; a pressure sensor in said common ~eed duct; and a computer being connected to said pressure sensor and for controlling said main valve, relief valve and valves in each of the branch ducts, such that if said relief valve is open, gas will be exhausted Erom those cushions connected to branch ducts whose valves are also open and if said relief valve is closed, pressurized gas is supplied through said pressure reducing valve and open main valve to the branch ducts and to those cushions whose valves are also open, the cc~puter being programmed such as to maintain the pressure in the cushions, and in the event of a change of position oE the patient, to set a new pressure ratio in the cushions.
By regular check of the pressure in each cushion or a group of cushions the control of the valve may take place fully auto~atically so that at any instant the pressure can be maintained~ In the event o~ a position change oE the patient, a previously introduced pro~ramme can be introduced so that the new pressure ratios in the cushions can he very rapidly set.
In one embodiment the common feed duct includes a controlled main valve and is connected at a point aEter the main valve with a controlled relief valve. By this control all cushions can be very rapidly provided with pressurized air or they can be separately or groupwise inflated or emptied.
In a preferred embodiment the common feed duct is provided with a pressure sensor.
In order to permit the patient to assume more than one recumbent pOSitiOIl~ a plurality of cushions are united into a section, which is supported by a carrying plate adjustable in a direction of height. In this way a sitting position can be obtained, which has in addition a centering effect on the patient on the bed so that also in a position change the correct pressure is automatically exerted on the correct place of the body.
In the preferred embodiment a pneumatic lifting means is arranged between each carrying plate and the bottom plate, which means is connected through a branch duct including a controlled valve with the commcn feed duct. In this way the pressure ratios with respect to the lying and sitting positions respectively are automatically obtained.
2~ In order to avoid the notorious, undesirable wave motion which can be particularly troublesome to a patient, each air cushion is embedded in a U-shaPed support of a foam substance. This support provides in addition a lateral support, which facilitates getting in and out of the bed.
If the air pressure should drop-off unexpectedly causing the cushion to deflate, ~he ~oam-support will act like a normal mattress so enhancing safety for the patient.
~ 5 ~ ~2~7263 In order to ensure optimum flexibility of the various cushions relative to one another, the width of the air cushion is equal to that of the U-shaped support. This facilitates in addition cleaning of the lying support.
The invention will be described more fully with reference to a preferred embodiment. The drawing shows in:
Fig. 1 is a perspective view of the bottom plate with carryinq plates adjustable in the vertical direction;
Fig. 2 is a perspective view like Fig. 1 of the air cushions with u-shaPed supports adapted to be deposited on the carrying plates of Fig. l; and Fig. 3 is a schematic survey of the pneumatic control-system for the lying-down support shown in Fig. 1 and 2.
The lying-down support comprises a base part, elements embedding the air cushionst ai~ cushions, hoses connecting the air cushions (or groups-of air cushions) with the pressure measuring and control-system and one or more separation covers holding together the air cushions and the elements embedding the same.
Fig. 1 illustrates an embodiment of the base par~. This base part includes a cover 1 holding carryin~ plates 2, the longitudinal dimensions of which largely correspond to the length of the lcwer legs, the upeer legs, the pelvis and the remaining upper part of the human body. Lifting bellcws 3 are located below these carrying plates 2. ~y pumping air into these bellows various sitting positions as well as ~5 other positions ~or the patient can be obtained. A botto~ plate 4 is arranged below these lifting bellows 3 and provides a stable substrate for these bell~s.
- 6 - ~ % ~7~63 Fig. 2 shows elements embedding the air cushions, the air cushions, and hoses connecting the air cushions (or groups o~ air cushions) with the measuring and control-system of the separation cover or covers. The air cushions 5 are embedded, for example, in foam rubber blocks 6, which are connected in turn tfor example glued) to the base part 7.
The standing rims 8 of the relatively stiff foam blocks 6 constitutes rigid side rims left and right of the bed. These side rims facilitate gettin~ in and out of the bed and can furthermore prevent the patient from siiding out of the bed.
Each air cushion is provided on one side with a hose 9 for connection to the pressure measuring and control-system~ The pressure measuring and control-system may be arranged in a housing below or at the side of the bed.
In the embodiment shown in Fig 2 the hoses ~ are guided through the channels lQ towards the side of the lying-dcwn support and then groupwise interconnected by using a collectin~ block 11. In this way ~roups of air cushions can be formed. From each collectin~ block 11 a single hose 12 passes towards the pressure measuring and ~0 control-system. As an alternative each hose 9 may be len~thened and extend up to the pressure measuring and control-system, after which the yroups are formed.
The air cushion 5 and the foam rubber block 6 can be held to~ether by a cover. It is not necessary to provide each ccmbination of cushion and foam rubber block with a separate cover. The construction t' _ 7 _ ~2~72~3 of the cover 13 from a single piece of material has an advanta~e in that ~utters 14 are formed between the air cushions for collectin~ any incontinency moisture, detergents and so on and conductin~ the same away towards the side of the lyin~-down support.
In order to protect the bed frame against soilin~ and to cover the hose 9, 12, flaps 15 may be provided on the left and right-hand side of the bed.
The pressure measuring and control-system is shown in Fig. 3.
It is desi~ned so that an expert can set for each patient and for each position of the body the pressures in the separate air cushions (or in the separate groups of air cushions) and l;fting bellows. The pressure sequences are then stored in a camputer memory and then they can be set for each body position by the nurse or the patient himself.
The operation of the pressure measurinq and control-system will now be described. Compressor 16, stock vessel 17, pressure switch 18, and adjustable reducin~ valve 19 constantly offer pressurized air of 1 to 2 atms. to the input of valve 20. When the pressure has to be raised in one of the liftin~ bellows or in one of the air cushions, valve 20 as well as one of the valves 21~ 22 or 23 open. If the pressure has to be lowered in one of the liftin~ bellows or in one of the air cushions, valve 24 as well as one of the valves 21, 22 or 23 open.
~f the pressure has to be measured in one of the liftin~
be~lows or in one of the air cushions, all valves are closed with the exception of th valves 21t 22 or 23. The computer obtains the pressure information from the pressure sensor 25.
The ahove-~entioned ~ma~netic) valves are actuated by the micro-computer when:
- 8 - ~Z47263 - 1. The patient or the nurse inform the micro-computer 2h of a change of body position and the computer states that the pressures of the lifting bellows or air cushions associated with the new position differ from the pressures associated with the earlier position; the "correct" pressures are - as stated above - stored by the expert in the computer memory.
2. The computer states during a fully autcmatic, periodic check, that the pressures of the lifting bellows or air cushions differ from the corresponding pressures stored in the memory.
0 Thanks to the above-described measuring and control-system the lying-down support can match patients of hi~hly different body lengths and various recumbent positions, since ~iven cushions can be without pressure for short parts of the body. Centerin~ of the patient takes place automatically when he is brou~ht into a sitting position, in which case the pelvis is brought to the pelvis-support.
, . . 0 S
Claims (5)
1. A bed comprising a bottom plate and a plurality of inflatable cushions supported transversely on said bottom plate along the length of the bed and cumulatively defining the body-supporting surface of the bed, said cushions being substantially gastight and means for maintaining gas under pressure internally of said cushions, said means comprising:
a gas pressure feed source, a common feed duct connected to said feed source, a main valve in said common feed duct, a plurality of branch ducts connected downstream of said main valve to said common feed duct and connected to distribute gas from said common feed duct to said inflatable cushions, a valve in each of said branch ducts whereby different ones of said cushions may be maintained at different pressures by isolating at least some of said branch ducts from each other and, a relief valve in said common feed duct downstream of the main valve, a pressure reducing valve in said common feed duct for controlling the pressure of gas supplied by said feed source to said branch ducts, a pressure sensor in said common feed duct, and a computer being connected to said pressure sensor and for controlling said main valve, relief valve and valves in each of the branch ducts, such that if said relief valve is open, gas will be exhausted from those cushions connected to branch ducts whose valves are also open and if said relief valve is closed, pressurized gas is supplied through said pressure reducing valve and open main valve to the branch ducts and to those cushions whose valves are also open, the computer being programmed such as to maintain the pressure in the cushions, and in the event of a change of position of the patient, to set a new pressure ratio in the cushions.
a gas pressure feed source, a common feed duct connected to said feed source, a main valve in said common feed duct, a plurality of branch ducts connected downstream of said main valve to said common feed duct and connected to distribute gas from said common feed duct to said inflatable cushions, a valve in each of said branch ducts whereby different ones of said cushions may be maintained at different pressures by isolating at least some of said branch ducts from each other and, a relief valve in said common feed duct downstream of the main valve, a pressure reducing valve in said common feed duct for controlling the pressure of gas supplied by said feed source to said branch ducts, a pressure sensor in said common feed duct, and a computer being connected to said pressure sensor and for controlling said main valve, relief valve and valves in each of the branch ducts, such that if said relief valve is open, gas will be exhausted from those cushions connected to branch ducts whose valves are also open and if said relief valve is closed, pressurized gas is supplied through said pressure reducing valve and open main valve to the branch ducts and to those cushions whose valves are also open, the computer being programmed such as to maintain the pressure in the cushions, and in the event of a change of position of the patient, to set a new pressure ratio in the cushions.
2. A bed as defined in claim 1 including a plurality of carrying plates for supporting a group of air cushions and a pneumatic lifting means for each carrying plate, each means being connected through a branch duct, including a controlled valve to said common feed duct.
3. A bed as claimed in claim 2 wherein each air cushion is embedded in an associated U-shaped support.
4. A bed as claimed in claim 3 wherein the width of the air cushion is equal to the width of the U-shaped support thereof.
5. A bed as claimed in claim 3 or 4 wherein said u-shaped support is made of a foam substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000460032A CA1247263A (en) | 1984-07-30 | 1984-07-30 | Lying down support comprising a plurality of inflatable cushions and an improved pressure measuring and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000460032A CA1247263A (en) | 1984-07-30 | 1984-07-30 | Lying down support comprising a plurality of inflatable cushions and an improved pressure measuring and control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1247263A true CA1247263A (en) | 1988-12-20 |
Family
ID=4128430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000460032A Expired CA1247263A (en) | 1984-07-30 | 1984-07-30 | Lying down support comprising a plurality of inflatable cushions and an improved pressure measuring and control system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1247263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2369775A (en) * | 2000-12-09 | 2002-06-12 | Huntleigh Technology Plc | Inflatable support |
-
1984
- 1984-07-30 CA CA000460032A patent/CA1247263A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2369775A (en) * | 2000-12-09 | 2002-06-12 | Huntleigh Technology Plc | Inflatable support |
| GB2369775B (en) * | 2000-12-09 | 2003-05-28 | Huntleigh Technology Plc | Inflatable support |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |