CA2016673C - Bed system - Google Patents
Bed systemInfo
- Publication number
- CA2016673C CA2016673C CA002016673A CA2016673A CA2016673C CA 2016673 C CA2016673 C CA 2016673C CA 002016673 A CA002016673 A CA 002016673A CA 2016673 A CA2016673 A CA 2016673A CA 2016673 C CA2016673 C CA 2016673C
- Authority
- CA
- Canada
- Prior art keywords
- bed
- siderail
- air
- set forth
- patient
- 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 - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
- A61G7/05—Parts, details or accessories of beds
- A61G7/0507—Side-rails
Abstract
In one aspect of the invention, a bed structure (10, Figs. 1-3) having a mattress deck panel (12, 14) and side panels (20, 22), with internal reinforcing bulkheads (24, 26, 28) and single-piece head- (30) and foot- (32) boards serving as reinforcing bulkheads at the head and foot of the structure. In another aspect of the invention, there is provided a low-cost air bed (10, Fig. 4) employing the above structure. In an additional aspect of the invention, there is provided an air bed which incorporates the air supply and control components within the bed structure itself (190, Fig. 10). In a further aspect of the invention, there is provided a low-noise air flow control pinch valve (172, Fig. 11; 280, Figs. 14,15). In yet another aspect of the invention, there is provided a single air bag (112, Fig. 7) which simulates multiple air bags through the use of welded internal baffles.
In yet an additional aspect of the invention, there is provided a bed siderail (42, 43, Figs. 2-6) which is patient-operable. In yet a further aspect of the invention, there is provided a device having the features of an air bed, which device is highly portable and which can be shipped by conventional mail or by parcel delivery services (400, Figs. 16-21).
In yet an additional aspect of the invention, there is provided a bed siderail (42, 43, Figs. 2-6) which is patient-operable. In yet a further aspect of the invention, there is provided a device having the features of an air bed, which device is highly portable and which can be shipped by conventional mail or by parcel delivery services (400, Figs. 16-21).
Description
Description Bed System S Technical Field The present invention relates to beds generally and, more particularly, to a novel bed structure especially suited for low air loss air beds and being exceptionally economical to manufacture and use.
Background Art While the present invention and particular features thereof are described for illustrative purposes as being applied, in one embodiment, to low loss air beds, it will be understood that the various aspects of the invention have applications in other types of beds, as we7.l as in non-bed applications, and all such applications are within the intent of the present invention.
?0 A major problem in health care facilities is with bed-bound patients who cannot turn or roll over without assistance. Failure to roll over relatively frequently causes restriction of blood flow in the area of bony protuberances on a patient's body which, in turn, causes ulcerated bed, or pressure, sores.
Such sores are extremely long-healing and, with a chronically or terminally ill patient, frequently recur. According to hospital industry standards, it has been estimated that to cure a single bed sore costs society an average $40,000 and many patients die from bed sores. A standard procedure is to have nursing personnel turn each immobile patient every two hours. This is not entirely unsatisfactory in a hospital setting where nursing staff is continually - 2 - 2t~~~~~
available, but may be an unsatisfactory procedure in institutions, such as nursing homes, or in private homes where such assistance may not be available on a frequent basis. One conventional technique for avoiding bed sores is to have the patient repose in a plaster of Paris bed in which the plaster of Paris has set to the patients contours. Although providing a hard surface, there is sufficient surface area that the pressure on the patient's body remains below the body's capillary pressure.
A recent development to address the problem of bed sores is the so-called "low loss air bed". This type of bed comprises a fairly typical hospital bed which has, instead of a standard mattress, a plurality of air bags disposed perpendicularly to the axis of the bed from its head to its foot. The shape of the air bags permits their deformation to accommodate the contours of the patient's body without undue local pressure areas developing. The pressure within the air bags is adjusted to give just the required support to each portion of the patient's body and the adjustment can be changed to periodically vary the pressure on each or all portions for eating, sleeping, etc. Such use of air bags greatly reduces the tendency for bed sores to form and, indeed, can promote the healing of already formed bed sores.
Typically, small streams of air are ejected from the upper sections of the air bags which are covered by a vapor-permeable sheet, such as a microporous polyurethane-coated nylon fabric. The streams of air dry any moisture vapor which permeates through the sheet and, therefore, helps remove another cause of bed sores and reduces the frequency of bedding changes. A discussion of the formation and prevention of bed sores, as well as some conventional types of low loss air beds may be found in Bed Sore Biomechanics, edited by R. M. Kenedi, J. M. Cowden, and J. T. Scales, Macmillan Press Ltd. publisher, 5 1976, which book and the references cited therein are made a part hereof by reference.
Conventional air beds typically include features found on standard hospital beds such as means to raise or lower head and/or foot portions, means to adjust 10 the height of the bed, etc. Frequently, such air beds consume a relatively large volume of air, thus requiring a relatively large blower and creating a noise problem from the air flow and the controls therefor unless extraordinary measures are taken to 15 dampen the noise. It would be desirable to have an air bed having low air flow requirements and having air flow control components which inherently produce a low noise level.
Perhaps the greatest disadvantage with 20 conventional air beds is that of high manufacturing cost. Such beds are fabricated from numerous small parts manually attached with fasteners and complex weldments and having a high labor content. Also, some of the features which are =ncluded in standard 25 hospital beds contribute to the high cost. The result of the high cost is that the use of such beds is restricted almost entirely to hospitals that have the financial means to purchase or rent such beds and, thus, immobile patients who otherwise could be 30 discharged to a nursing home or private home must be maintained in the formal hospital setting. It would be highly desirable to have available an air bed which could be afforded by those outside of a formal hospital setting.
Background Art While the present invention and particular features thereof are described for illustrative purposes as being applied, in one embodiment, to low loss air beds, it will be understood that the various aspects of the invention have applications in other types of beds, as we7.l as in non-bed applications, and all such applications are within the intent of the present invention.
?0 A major problem in health care facilities is with bed-bound patients who cannot turn or roll over without assistance. Failure to roll over relatively frequently causes restriction of blood flow in the area of bony protuberances on a patient's body which, in turn, causes ulcerated bed, or pressure, sores.
Such sores are extremely long-healing and, with a chronically or terminally ill patient, frequently recur. According to hospital industry standards, it has been estimated that to cure a single bed sore costs society an average $40,000 and many patients die from bed sores. A standard procedure is to have nursing personnel turn each immobile patient every two hours. This is not entirely unsatisfactory in a hospital setting where nursing staff is continually - 2 - 2t~~~~~
available, but may be an unsatisfactory procedure in institutions, such as nursing homes, or in private homes where such assistance may not be available on a frequent basis. One conventional technique for avoiding bed sores is to have the patient repose in a plaster of Paris bed in which the plaster of Paris has set to the patients contours. Although providing a hard surface, there is sufficient surface area that the pressure on the patient's body remains below the body's capillary pressure.
A recent development to address the problem of bed sores is the so-called "low loss air bed". This type of bed comprises a fairly typical hospital bed which has, instead of a standard mattress, a plurality of air bags disposed perpendicularly to the axis of the bed from its head to its foot. The shape of the air bags permits their deformation to accommodate the contours of the patient's body without undue local pressure areas developing. The pressure within the air bags is adjusted to give just the required support to each portion of the patient's body and the adjustment can be changed to periodically vary the pressure on each or all portions for eating, sleeping, etc. Such use of air bags greatly reduces the tendency for bed sores to form and, indeed, can promote the healing of already formed bed sores.
Typically, small streams of air are ejected from the upper sections of the air bags which are covered by a vapor-permeable sheet, such as a microporous polyurethane-coated nylon fabric. The streams of air dry any moisture vapor which permeates through the sheet and, therefore, helps remove another cause of bed sores and reduces the frequency of bedding changes. A discussion of the formation and prevention of bed sores, as well as some conventional types of low loss air beds may be found in Bed Sore Biomechanics, edited by R. M. Kenedi, J. M. Cowden, and J. T. Scales, Macmillan Press Ltd. publisher, 5 1976, which book and the references cited therein are made a part hereof by reference.
Conventional air beds typically include features found on standard hospital beds such as means to raise or lower head and/or foot portions, means to adjust 10 the height of the bed, etc. Frequently, such air beds consume a relatively large volume of air, thus requiring a relatively large blower and creating a noise problem from the air flow and the controls therefor unless extraordinary measures are taken to 15 dampen the noise. It would be desirable to have an air bed having low air flow requirements and having air flow control components which inherently produce a low noise level.
Perhaps the greatest disadvantage with 20 conventional air beds is that of high manufacturing cost. Such beds are fabricated from numerous small parts manually attached with fasteners and complex weldments and having a high labor content. Also, some of the features which are =ncluded in standard 25 hospital beds contribute to the high cost. The result of the high cost is that the use of such beds is restricted almost entirely to hospitals that have the financial means to purchase or rent such beds and, thus, immobile patients who otherwise could be 30 discharged to a nursing home or private home must be maintained in the formal hospital setting. It would be highly desirable to have available an air bed which could be afforded by those outside of a formal hospital setting.
Another class of persons subject to pressure sores are those who are handicapped and working, but who are confined to wheelchairs. The day-long confinement to a wheelchair causes the same problem S with pressures sores as does confinement in a bed. In such a situation, when the person develops one or more such sores, the person must drop out of the person's position in society for a month or more while the sore is cured. Of course, when the person returns to the 10 wheelchair, sores will likely recur and the process is repeated. It has been found that, if such a person is able to sleep in an air bed, such permits incipient sores to heal during the night, even though the person is confined to a wheelchair during the day.
15 Unfortunately, the cost of a conventional air bed puts it out of the reach of many such persons who must continue to suffer.
A further factor contributing to the relatively high cost of conventional air beds is the arrangement 20 of the air bags. Typically, the bags are arranged in groups of three to five bags each with the bags in a group supplied with air of the same pressure through a manifold. It would be simpler to have a single air bag approximating the dimensions of three or more 25 conventional air bags, but simply making one bag larger would cause that bag to approach a spherical shape, thus making it unsuitable for patient support.
However, it would be desirable to have available a single air bag which would simulate a group of 30 conventional air bags. Such a single bag would simplify the air supply arrangement and be more economical to manufacture.
_ 5 _ ~~~.6~'~~
An important cost factor in the use of conventional air beds is their lack of portability.
This means that shipping and installing such beds requires a relatively costly procedure and, of course, 5 it is impossible for an ambulatory or wheelchair bound patient requiring an air bed to conveniently relocate, or have relocated, such a bed. It would be desirable to have a device with the therapeutic features of an air bed, but one that is highly portable and can easily be shipped by conventional mail or by commercial parcel delivery services and which can be easily relocated.
Another feature of standard hospital-type beds that can contribute to their high cost, and also that 15 contributes to difficulty in their use by the patient or the patient's aide, is the siderails employed with such beds. Typically, such siderails are of one of two types. One type comprises a single-piece tubular siderail structure ~ohich extends substantially the 20 length of the bed and which must be lifted off to allow the patient to be moved or, if the patient is mobile, to allow the patient to exit or enter the bed. Removal and replacement can be difficult for the aide and impossible for the impatient. The other 25 typical type comprises a similar siderail structure which has a complicated and expensive hinged mechanism to allow the siderail to be lowered to the floor.
This may be more convenient for the aide, but is impossible for the patient to maneuver if the patient 30 is in the bed.
Accordingly, it is a principal object of the present invention to provide a bed structure which is simple and economical to manufacture and which may be used in a number of applications, including air beds.
- ~Ul~f'7~
A further object of the invention is to provide a air bed which is simple and economical to manufacture and which may be used in nursing homes or private homes.
Another object of the invention is to provide an air flow control valve which inherently produces a low level of noise, which is economical to manufacture, and which may be used for air flow control on air beds.
An additional object of the invention is to provide a single air bag which simulates a plurality of conventional air bags and which may be used for air beds.
Yet an additional object of the invention is to provide a bed siderail which is relatively economical and which is easy to manipulate either by the patient unattended or the patient's aide.
Yet another object of the invention is to provide a device offering the features of an air bed, but one which is highly portable and may be shipped by conventional mail or by commercial parcel delivery services.
Other objects of the invention, as swell as particular features and advantages thereof, will, in part, be obvious and will, in part, be apparent from the following description and the accompanying drawing figures.
Disclosure of Invention The present invention accomplishes the above objects, among others, by providing, in one aspect of the invention, a bed structure having a mattress deck panel and side panels, with internal reinforcing bulkheads and single-piece head- and footboards ~~~~f~'~'~
serving as reinforcing bulkheads at the head and foot of the structure. In another aspect of the invention, there is provided a low-cost air bed employing the above structure. In an additional aspect of the invention, there is provided an air bed which incorporates the air supply and control components within the bed structure itself. In a further aspect of the invention, there is provided a low-noise air flow control pinch valve. In yet another aspect of the invention, there is provided a single air bag which simulates multiple air bags through the use of welded internal baffles. In yet an additional aspect of the invention, there is provided a bed siderail which is patient-operable. In yet a further aspect of the invention, there is provided a device having the features of an air bed, which device is highly portable and which can be shipped by con~~entional mail or by parcel delivery services.
Brief Description of Drawings Figure 1 is an exploded perspective view of bed structure according to the present invention.
Figure 2 is a side elevation view of the assembled bed structure of Figure 1.
Figure 3 is an end elevation view of the assembled bed structure of Figure 1.
Figure 4 is a side elevation view of the assembled bed structure of Figure 1 adapted For use as an air bed.
Figure 5 is a fragmentary exploded perspective view of the siderail structure according to the present invention.
Figure 6 is a detail of Figure 5.
~fl~~~~~
_$_ Figure 7 is a side elevation view of an air bag constructed according to the present invention.
Figure 8 is a top plan view of the air bag of Figure 7.
5 Figure 9 shows diagrammatically the air supply system of the present invention.
Figure 10 is a bottom plan view looking up, with the bottom panel removed, of the air bed of Figure 4.
Figure 11 is a side elevation view of an air 10 flow control~valve according to the present invention.
Figure 12 is a fragmentary, partially sectional, exploded perspective view showing the construction and means of mounting the air filter of Figures 9 and 10.
Figure 13 is a side elevation view of the bed 15 structure of Figure 2 having a portion of the deck thereof inclinable.
Figure 14 is a side elevation view of another embodiment of an air flow control valve according to the present invention.
20 Figure 15 is a cross-sectional top plan view of the flow control valve of Figure 14.
Figure 16 is a perspective view of an alternative embodiment of an air bed system according to the present invention, being transported on a hand 25 truck.
Figure 17 is a perspective view of the air bed system of Figure 16, with the mattress structure thereof deflated and rolled, disposed on a hospital bed.
30 Figure 18 is a fragmentary side elevation view showing the attachment means for the mattress structure of Figure 17 and a mattress cover.
Figure 19 is a perspective view of a patient reposed on the bed system of Figure 16.
~1~~~~
Figure 20 is a perspective view of a patient lying on the air bed system of Figure 16, with a fully inflated mattress structure, but with the mattress cover removed.
Figure 21 is a perspective view of a patient lying on the mattress structure of Figure 20, with the mattress structure partially deflated preparatory to initiating CPR procedures.
Figure 22 comprises two perspective views illustrating means for releasably attaching an air hose to an air bag.
Figure 23 is an end elevation view illustrating a means of attachment of an air bag to a base pad according to the present invention.
Figure 24 is a side elevation view of an alternative mattress structure arrangement according to the present invention.
Figure 25 is an alternative base pad structure according to the present invention.
Figure 26 is a top plan view of the air bags of the mattress structure of Figure 17.
Figure 27 is a perspective view illustrating the means of manufacture of air bags according to the present invention.
Figure 28 is a side elevation view of the means of Figure 27.
Best Mode for Carrying out the Invention Referring now to the Drawing in which identical or similar elements are given the same reference numerals throughout the various figures thereof, Figure 1 is an exploded perspective view of the bed structure of the present invention, generally indicated by the reference numeral 10, and Figures 2, - l o- ~~~.~if~'~~
3, and 4 are, respectively, side elevation, end elevation, and side elevation views of the bed structure assembled, with Figure 4 showing the bed structure adapted for use as an air bed. Bed structure 10 includes first and second deck panels 12 and 14 having flanges 16 and 18 running the length of deck panels 12 and 14, respectively, and extending orthogonally downward from the inner edges thereof.
Flanges 16 and 18 can be joined along the length thereof to form a flat horizontal deck.
Extending orthogonally downward from the outer edges of first and second deck panels 12 and 14, respectively, are side panels 20 and 22. Reinforcing bulkheads 24, 26, and 28 are provided for attachment to deck panels 12 and 14 and side panels 20 and 22.
Completing the basic bed structure are headboard 30 and footboard 32 attached to either end of the structure formed by attached deck panels 12 and 14 and side panels 20 and 22.
Although the basic bed structure may be employed using only the elements described above, its weight capacity would be somewhat limited. Accordingly, a bottom panel 34 may be provided for attachment to bulkheads 24, 26, and 28 and headboard 30 and footboard 32 for greater reinforcement to permit higher weight capacity. As will be described below, bottom panel is also useful when bed structure 10 is to be used in a low loss air bed embodiment.
Reinforcing members 36, 37, 38, and 39 may be provided for attachment at the intersections of deck panels 12 and 14 and side panels 20 and 22 to help provide support for siderail structures, as generally indicated by the reference numerals 42, 43, and 44 -1 1 _ ~.~i~~'~
(Figures 2-4), when such siderail structures are used with bed structure 10.
For convenience in moving bed structure 10, lockable casters, as at 48, 49, and 50, may be provided at the lower edges of side panels 20 and 22.
Deck/side panels 12/20 and 14/22, bulkheads 24, 26, and 28 bottom panel 34 and reinforcing members 36-39 are preferably formed from steel sheet and attached by spot welding or riveting. The foregoing elements may be 18-gauge in thickness. Headboard 30 and footboard 32 are preferably constructed of plastic-faced composition board and attached by means of machine screws, as at 46 (Figure 3). Other materials and attachment methods for the above elements may be employed, if desired.
The seams formed between flanges 16 and 18 and between deck panels 12 and 14 and headboard 30 and footboard 32 are preferably sealed with a suitable conventional sealant to prevent liquids from seeping below the deck panels.
Figure 5 is an exploded perspective view of a portion of a typical siderail structure, generally indicated by the reference numeral 60, and Figure 6 is a detail thereof. Siderail structure 60 includes a mounting boss, generally indicated by the reference numeral 62, which includes a flange portion 64 and a shaft portion 66. Flange portion 64 may be mounted to the side of a bed (not shown) by means of rivets or screws, as at 67. Siderail structure 60 further includes a vertical member 68 and a horizontal gate member 70 formed as an horizontal extension of the vertical member. Defined in the lower end of vertical member 68 is a round opening 72 sized to closely moveably engage shaft portion 66 of mounting boss 62, and a threaded hole 74 extending from one edge of the vertical member to the round opening and sized for moveable engagement with threaded spring-loaded locking pin 76. Completing siderail structure 60, when assembled, is a stop pin 78 fixedly disposed at the lower end of vertical member 68 for moveable engagement with a groove 80 defined in flange 64 of mounting boss 62, a spring washer 82 captured between flat spacers 84 and 86, the latter spacers bearing against flange 64 and the back surface of the vertical member, respectively, a flat spacer captured between the front surface of the vertical member and a retaining ring 88 which releasably engages an annular groove 92 on shaft portion 66 of mounting boss 62, and a trim cap 94 which is attached to the distal end of shaft portion 66.
In use, siderail structure 60 may be rotated 90 degrees between a closed position, as indicated by the positions of siderail structures 42 and 43 on Figure 2~ and an open position, as indicated by the positions of siderail structures 42 and 43 on Figure 4. When in its closed position, stop pin 78 engages the upper end of groove 80, as shown in solid lines on Figure 6, thus holding the siderail structure against clockwise motion. To move siderail structure 60 to its open position, it is rotated 90 degrees counterclockwise so that stop pin 78 engages the lower end of groove 80, as shown in dashed lines on Figure 6, thus preventing further counterclockwise motion of the siderail structure. Because the center of gravity of siderail structure 60 is relatively close to its balance point when the siderail structure is rotated in either direction, it is relatively easy to operate it through a full cycle. To move sidewall structure 60 from its open position, one need only exert relatively light pulling force on it. Thus, sidewall structure 60 is patient-operable.
Spring washer 82 introduces sufficient friction into the movement of siderail structure 60 to impede the motion thereof, thus preventing slamming of the siderail structure from position to position.
If it is desired to lock siderail structure 60 into either its open or its closed position, one engages locking pin into hole 96 or hole 98 (Figure 6), respectively, defined in shaft 66 on mounting boss 62. Locking pin 76 may be engaged into either locked position by rotating the distal end of the spring-loaded pin 90 degrees from the rest position, thereby permitting selective indexing in either open or closed positions.
Siderail structure 60 may be formed of any suitable material, but is preferably formed from die cast aluminum and suitably dimensioned for appropriate strength. Other elements of siderail structure 60 may be constructed of any suitable conventional materials.
In addition to providing a relatively light, easily maneuverable siderail structure, the present invention, employing two siderails on each side of a bed, has an additional advantage. With a partially mobile patient, the siderail structure at the foot of the bed may be opened, while the that at the head of the bed remains locked in its closed position, so as to allow the latter to be used as a hand-hold to assist the patient in exiting and entering the bed.
While bed structure 10 may be used as a light and low- cost support of standard composite mattresses, air mattresses, or water mattresses, it is especially suited for adaptation to use as an air bed, as will be described below.
Referring now to Figure 4, there is shown, in side elevation, bed structure 10 adapted for use as an air bed, including air bags 112, 113, 114, 115, and 116 disposed on the deck (not shown) of the bed 10 structure. Air bags 112-116 are held in place in abutting relationship between headboard 30 and footboard 32 by fastening to the side panels, such as side panel 20 by means of snaps, as at 118. Over air bags 112-116 may be disposed a vapor-permeable 15 mattress pad 120 which is held in place by fastening to side panel 20 by means of snaps, as at 122.
Mattress pad 120 may be a microporous polyurethane-coated nylon fabric.
The construction of a typical air bag, air bag 20 112, is shown in side elevation on Figure 7 and in top plan view on Figure 8. Air bag 112 includes rectilinearly disposed ends 130 and 132, bottom 134, top 136, and sides 138 and 140. Formed as a downward extension of side 138 is a snap flap 142 on which are 25 mounted snaps, as at 118. Disposed internally of air bag 112 are bulkheads 144, 145, and 146 extending between and attached to bottom 134 and top 136.
Bulkheads 144-146 keep top 136 relatively horizontal and simulate in one bag the shape of four conventional 30 air bags. The convex segments thus obtained yieldably support a patient without material wrapping around the patient. The bag elements may be welded either thermally or with RF sealing equipment. The material of the bags is preferrably nylon fabric with an inside -15 - i~'~~.~F '~~
polyurethane coating, an air bag fabric known in the art, with the polyurethane material being that which is fused during welding.
Air is supplied to air bag 112 through a nipple 148, which air inflates the air bag. Nipple 148 extends through a hole 149 (Figure 1) in deck panel 12 for attachment to an air supply hose (element 174 on Figure 10). The air slowly flows from air bag 112 through orifices, as at 150, defined in top 136 of the air bag. This flow of air dries any moisture which may permeate through comforter 120 (Figure 4). The air is preferrably supplied to air bags 112-116 at a flow rate of on the order of about 10 CFM and at a pressure of less than 26mm Hg which is the normal capillary pressure of a normal person. Actual pressures are determined by patient physiology and the need to level the patient's spine for comfort.
The means by which air~.is supplied to air bags 112-116 is shown diagrammatically on Figure 9 and in a fragmentary bottom plan view looking up, with the bottom removed, of bed structure 10 on Figure 10.
Supply air is drawn through an opening 158 defined in bottom 34 near the head end of bed structure 10 (Figure 1), through the internal space of the bed structure, and through a filter 160 by a blower 162, the motor of which is connected to an on/off switch 164 and an electrical supply cord 166. Filter 160 is not shown in proper position on Figure 8, as it. is actually mounted over opening 161 defined in bottom 34 of bed structure 10 (Figure 1), the reason for which is described below.
Air from blower 162 passes through an air silencer 168 and to a manifold 170. From manifold 170, the air flows through air flow control valves, _ 16_ iG~IEiF'~~
such as flow control valve 172 which supplies air bag 112 (Figure 9), and through hoses 174, 175, 176, 177, 178, and 179. Hoses 174-178 supply air to air bags 112-116, respectively, while hose 179 discharges to the atmosphere from flow control valve 180 so as to permit control of the pressure in manifold 170. The pressure in each of air bags 112-116, and therefore the firmness or softness of each bag, can be controlled through adjustment of its associated flow control valve. With the five air bag arrangement, air bag 112 is disposed so as to provide support for the head of the patient's body, air bag 113 for the back, air bag 114 for the seat, air bag 115 for the thigh, and air bag 116 for the foot. It will be understood, for example, that, on Figure 10, air bag supply hose 175 is connected to a nipple (not shown) to supply air bag 113 with air.
Hoses 174-177 pass through bulkheads 24, 26, and 28, as shown on Figure 10, through openings defined in the bul~:heads, as at 182, each of which bulkheads is shown as having defined therein four openings, so as to provide economy in the use of a standard part.
Filter I60 may be a conventional filter/silencer, blower 162 may be a conventional regenerative pressure blower, and silencer 168 may be a conventional silencer, all as are commercially available.
Figure 10 also illustrates how joined flanges 16 and 18 form a reinforcement member along the longitudinal axis of bed structure 10.
Reference to Figures 1 and 10 indicates some of the low noise features of the present invention as applied to air beds. First, the air supply components are disposed in a cavity 190 defined by deck/side panels 12/20 and 18/22, bulkhead 28, footboard 32, and bottom 34, with no openings directly from the cavity to the surroundings. Blower 162 is mounted to deck panel 14 rather than to bottom 34, which mounting position tends to deaden sound and vibrations produced by the blower. Rather than have air enter cavity 190 directly from the surroundings, which would present an opening for the exiting of sound, the air is drawn through opening 158 at the opposite end of bed 10 structure 10 and flows to the cavity at relatively low velocity around baffles 24, 26, and 28 and through holes 182 in the baffles. As described below with reference to Figure 12, filter 160 covers and seals opening 161 in cavity 190.
15 A further aspect of the present invention which affords low noise level is the construction of the flow control valves, such as flow control valve 172 shown in side elevation on Figure 11. Here, control valve 172 is mounted in a frame and includes a section 20 of flexible tubing 202 a portion of the diameter of which may be constricted by the advancement of a convex member 204 disposed at one end of a threaded shaft 206, at the other end of which shaft is fixedly attached a knob 208. Shaft 206 passes through an 25 internally threaded boss 210 which is fixed to frame 200. Preferrably, a lubricant is disposed between tubing 202 and convex member 204. Fitting 212 is connected to tubing 202 to supply air thereto and fitting 214 is connected to the tubing to supply air 30 therefrom. As is evident from Figure 11, rotating shaft 206 so as to advance convex member 204 against the wall of tubing 202 will cause the flow of air through valve 172 to be diminished, while withdrawing convex member 204 will increase the flow of air. It -18 _ ~.'~f"
has been found that the shape formed by tubing 202 as it is constricted inherently causes very little noise to be produced as air flows through the tubing, due to the shallow entry angle and smooth bore, in contrast to the gate valves typically used in such air supply systems, which gate valves are inherently noisy.
Figures 14 and 15 illustrate another embodiment of a flow control valve according to the present invention, generally indicated by the reference numeral 280. Flow control valve includes a generally rectilinear box-shaped bracket or frame 282 through one wall 284 of which frame a partially threaded shaft 286 is rotatably disposed. Shaft 286 may be manually rotated by means of a knob 290 fixedly attached to the distal end of the shaft. Collars 290 and 292 fixed to shaft 286 adjacent either side of wall 284 maintain the shaft in fixed axial relationship with the wall.
The threaded proximal portion of shaft 286 engages the threaded end of a yoke 294 the arms of which extend through a slot 296 formed in a wall 298 of frame 282. Assuming a normal right hand thread on shaft 286, it can be seen from Figures 14 and 15 that rotation of shaft 286 in the clockwise direction will cause yoke 294 to be drawn to the right, while rotation of shaft 286 in the counterclockwise direction will cause yoke 294 to be pushed to the left.
Fixed to the outer side of wall 298 and maintaining yoke 294 in slot 296 is an anvil 300 having an outwardly convex cylindrical shape.
Disposed within the arc formed by the joined arms of yoke 296 is a flexible tube 302 which has a fitting 304 at one end thereof to supply air thereto and a fitting 306 at the other end thereof to supply air therefrom. Tube 302 is disposed so that its axis is parallel to the axis of cylindrical anvil 300.
It can be seen from inspection of Figures 14 and 15 that rotation of shaft 286 in the clockwise 5 direction will cause yoke 294 to press tube 302 against anvil 300 resulting in the formation of a constriction of the tube between the yoke and the anvil, thus decreasing the rate of flow of air therethrough. Substantially the entire periphery of tube 302 is contained at the plane of constriction, with yoke 294 engaging at least one-half the outer periphery of tube 302 and anvil 300 engaging a large portion of the balance of the outer periphery of the tube, so that very precise and repeatable flow control may be achieved.
It has been found that PVC tubing is an especially suitable material for tubing 202 and, for the above application, tubing with a 5/8-inch ID and a 1/8-inch r,~all thickness is preferable.
20 Figure 12 is a exploded perspective detail view showing the arrangement of filter 160. Filter 160 includes a pleated filter element 240 which fits concentrically in a housing 242 and an end cap 244 which fits over the end of the filter element and is 25 held in place, and holds the filter element in the housing and the housing on a plate 246, by means of a wing nut 248 which engages the threaded end of a retaining stud 250 attached to one end of the end cap and which is passed through a hole 252 on the plate.
30 A hose 254 is attached to the other end of end cap 244 to supply filtered air to blower 162 (Figures 9 and 10).
Filter 160 is mounted to, and closes, opening 161 in bottom panel 34 by engaging a flange 256 formed on plate 246 with an edge 258 of the opening, as shown by the dashed arrows, and then rotating the plate into 5 its closed position against the bottom panel, also as shown by the dashed arrows, and securing it in that position by inserting the threaded end of a mounting screw 260 through a hole 262 formed in the plate and then advancing the mounting screw into a threaded hole 264 formed in the bottom panel.
When thus mounted, air enters filter 160 from cavity 190 (Figure 10), flows around end cap 244 into the annulus defined between filter element 240 and housing 242, through the filter element, and then 15 through hose 254 attached to the end cap. Air is thus supplied to blower 162 without having any opening directly from cavity 190 to the surroundings, which opening could be a conduit for the transmission of airbourne noise.
20 The placement of filter 160, as shown on Figure 12, permits easy access thereto for cleaning or replacement of filter element 240 by simply loosening retaining nut 262 and swinging the filter away from opening 161.
25 Figure 13 is a side elevation view of the bed structure of the present invention showing an embodiment thereof in which a portion of the bed deck is inclinable, in which figure, elements the same as, or similar to those shown on~Figures 1-4 are given 30 primed reference numerals. Here, bed structure 10' is constructed the same as bed structure 10, but first and second deck panels 12' and 14' are divided athwart the bed structure so as to form the top of an inclinable portion 220. Likewise, first and second side panels 20'and 22' are divided (only panel 20' visible) to form the sides of inclinable portion 220, and headboard 30' is divided as shown. Deck panels 12' and 14' may be provided with a hinge structure at 5 222 and filler panels, as at 224, may be provided for safety. An upper bottom panel 226 may be provided along at the bottom of inclinable portion 220 extending between side panels 20' and 22' and headboard 30'and a lower top panel 228 may be provided 10 extending between the side panels and the headboard.
The means by which inclinable portion 220 is raised may be any conventional mechanism known in the art, and may be the telescoping mechanism 230 shown on Figure 13, and the mechanism used may be adapted by 15 conventional means known in the art to be patient operable.
Inclinable portion 220 permits adjustment of bed structure 10' so that a patient may be placed in a convenient posture for reading or eating. A similar 20 inclinable portion may be provided at the foot of bed structure 10' instead of, or in addition to, inclinable portion 220.
Bed structure 10' is preferably constructed according to the techniques shown and described above 25 with reference to bed structure 10 and may also be adapted for use as an air bed as taught above.
Figures 16-21 illustrate an air bed system, generally indicated by the reference numeral 400, which, among other features, is highly portable and 30 which may be employed in a variety of circumstances.
Referring now to Figure 16, in which bed system 400 is shown ready for shipping or other relocation, bed system includes only three major elements: a low loss air mattress structure 12, shown deflated and _ 2 2 _ iG~U~.~~'~
secured in a roll, an air supply 14, and a coil of four air hoses 406-409. As can be seen from Figure 16, the entire system is secured to a small hand cart 412 for easy transport. Alternatively, bed system 400 could be boxed and, when so boxed, the overall dimensions thereof are, for example, well within the maximum dimensions set by the United Parcel Service of (girth + length =) 130 inches maximum and the weight thereof is less than the UPS maximum of 70 pounds, as well as within the maximum dimensions set by the United States Postal Service of (girth + width =) 100 inches maximum and the weight thereof is less than the LISPS maximum of 70 pounds. Thus, a complete low loss air bed system can be sent across the United States for a very modest sum and can be air-freighted anywhere in the world also at relatively low cost.
In Figure 17, mattress structure 402, still in its deflated and rolled state, has been placed on the springs 420 of a standard articulated hospital bed, generally indicated by the reference numeral 422;
although, it will be apparent from inspection of the drawing figures and from the following description that the bed system would work quite satisfactorily if the mattress structure were placed on any type of bed or even, if necessary, on a large table or on a floor. Air supply 404 has been conveniently hung from a bracket 424 which has been placed over the horizontal frame members of bed 422 and air supply hoses 406-409 have been connected to the air supply.
It may be assumed that air supply 404 is similar to that described with reference to Figures 9 and 10, except that this air supply has been provided with its own, conventional housing.
On Figure 18, mattress structure 402 has been unrolled on bed 422 and inflated. Mattress structure 402 comprises, in this case, four air bags 440-443 (only a portion of 443 visible on Figure 18) of the 5 type described above with reference to Figures 4, 7, and 8, attached to a base pad 446. Base pad 446 has attached thereto a plurality of straps, as at 448, which are buckled around the horizontal members of the frame of bed 422 and which hold mattress structure 402 10 firmly in position on the bed. Disposed on strap 448 is a snap fitting 450 which may be used for attachment thereto of a complementary snap fitting 452 on a strap 454 attached to a mattress cover 456 of the type described above. Thus, mattress cover 456 is firmly 15 held in position over mattress structure 402 without slipping.
As can be seen on Figure 18, air bag 443 is inflated by means of hoses 409 attached thereto.
Figure 19 shows bed 422 and bed system 400 with 20 a patient reposed thereon, the bed having the back and knee portions thereof elevated. This figure illustrates and important advantage of the air bags of the present invention. ~'ith conventional air bags, the ends of the air structure must be supported so 25 that the air bags do not spill over the ends of the bed. Here, as can be seen on Figure 19, the structural rigidity of the air bags of the present invention permit elevating the head~section of bed 422, yet no special provision need be made to support 30 the end of air bag 443 (under mattress cover 456) on that section.
Figures 20 and 21 illustrate how bed system 400 may be made ready quickly for cardiopulmonary resuscitation (CPR) procedures, which require that the patient's back be supported on a firm surface in order to perform manual chest compressions on the patient.
Figure 20 shows a patient lying on a fully inflated mattress structure 402. (For greater clarity, 5 mattress cover 456 is not shown on Figures 20 and 21.) When CPR procedures are indicated, an attendant (not shown) deflates air bags 442 and 443 by grasping the ends of air hoses 408 and 409 at their connections to the air bags and disconnecting them. On Figure 21, 10 the attendant has disconnected air hoses 408 and 409 from air bags 442 and 443 which have deflated, thus lowering the back and seat portions of the patient to be supported on the surface of base pad 446 (base pad not visible on Figure 21). CPR can now be started by 15 a person climbing on top of the bed and beginning the procedure. Keeping the foot and thigh portions of mattress structure 402 inflated is preferred, as that causes blood to flow to the head of the patient. The deflation can be accomplished in 8-15 seconds and the 20 air supply controls do not have to be touched.
Figure 22 illustrates a preferred method of assuring that the air hoses remain attached to the air bags and cannot be accidentally disconnected. Since bed system 400 is designed to be portable, it is 25 necessary that the ends of the hoses ma~~ be secured in any orientation in which they may happen to be connected to the air bags. Here, the end of a typical air hose 466 is attached to an elbow connector 468 sized to fit over a flanged nipple 470 attached to an 30 air bag 472. A plate 474 rotatingly disposed on nipple 470 has attached thereto the ends of straps 476 and 478. After hose 466 is connected to air bag 472, straps 476 and 478 are placed over the hose and connected together by means of a buckle (not shown) or they may be Velcro material has shown) and require no separate mechanical connecting mechanism. Thus, regardless of the orientation of hose 466 about nipple 470, plate 474 may be rotated so that straps 476 and 5 478 can be positioned to releasably hold hose 466 securely in place.
The embodiment being described includes having air hose connections to the sides of the air bags.
Alternatively, within the intent of the present 10 invention, air hose connections could be furnished on the bottoms of the air bags. The former arrangement is preferred, however, since it offers greater flexibility in the types of surfaces with which the bed system may be employed.
15 As illustrated above, base pad 446 is a single piece of material and it has been found that a preferred material is 1/8-inch thick neoprene rubber, especially when mattress structure 402 is to be placed over springs; although, any suitable material may be 20 employed, provided it has sufficient flexibility to be rolled or folded into a suitable shape for shipping.
For example, other synthetic rubber materials, reinforced or not, fabric mats, or even slats interleaved with webbing, as illustrated on Figure 25 25 may be employed. The bottom panels of the air bags may also serve as base pads, Figure 24 illustrating how such air bags could be joined together by means of snaps, as shown, or by other mechanical means.
Figure 23 illustrates how air bags 440-443 are 30 preferably attached to base pad 446. Here, air bag 440 is shown as being attached to base pad 446 by means of a plurality of snap fittings, as at 484 and 486.
Bed structure 10 described above employed five air bags 112-116, each having four compartments.
While that arrangement is quite satisfactory, it has been found that the arrangement of air bags 440-443 5 can improve patient comfort in some cases. Figure 26 illustrates such an arrangement wherein it can be seen that each of air bags 440 and 443 has seven compartments, while each of air bags 441 and 442 has four compartments.
10 Figure 27 illustrates the preferred method of fabricating an air bag. Here, there is first formed an open sleeve, generally indicated by the reference numeral 490, comprising bottom 492, top 494, and sides 496 and 498. Then, bulkheads 500-505 are positioned 15 over fixture 508 and the fixture with the bulkheads thereon is inserted in sleeve 490. Referring now to Figure 28, sleeve 490 is then placed on a base plate 512 and an RF platen is lowered to top 494 of the sleeve. RF energy heats fixture 508 and the upper and 20 lower edges of bulkheads 500-505 are thereby welded to top 494 and bottom 492. Finally, the ends of the air bag are welded to either end of the sleeve to complete the fabrication. Such a method of fabrication provides a rapid and economical method of fabricating 25 air bags or similar articles having internal bulkheads. Fixture 508 is preferably aluminum or brass.
It will thus be seen that the objects set forth above, among those made apparent from the preceding 30 description and the accompanying drawing figures, are efficiently attained and, since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown on the accompanying drawing figures shall be interpreted as illustrative only and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
15 Unfortunately, the cost of a conventional air bed puts it out of the reach of many such persons who must continue to suffer.
A further factor contributing to the relatively high cost of conventional air beds is the arrangement 20 of the air bags. Typically, the bags are arranged in groups of three to five bags each with the bags in a group supplied with air of the same pressure through a manifold. It would be simpler to have a single air bag approximating the dimensions of three or more 25 conventional air bags, but simply making one bag larger would cause that bag to approach a spherical shape, thus making it unsuitable for patient support.
However, it would be desirable to have available a single air bag which would simulate a group of 30 conventional air bags. Such a single bag would simplify the air supply arrangement and be more economical to manufacture.
_ 5 _ ~~~.6~'~~
An important cost factor in the use of conventional air beds is their lack of portability.
This means that shipping and installing such beds requires a relatively costly procedure and, of course, 5 it is impossible for an ambulatory or wheelchair bound patient requiring an air bed to conveniently relocate, or have relocated, such a bed. It would be desirable to have a device with the therapeutic features of an air bed, but one that is highly portable and can easily be shipped by conventional mail or by commercial parcel delivery services and which can be easily relocated.
Another feature of standard hospital-type beds that can contribute to their high cost, and also that 15 contributes to difficulty in their use by the patient or the patient's aide, is the siderails employed with such beds. Typically, such siderails are of one of two types. One type comprises a single-piece tubular siderail structure ~ohich extends substantially the 20 length of the bed and which must be lifted off to allow the patient to be moved or, if the patient is mobile, to allow the patient to exit or enter the bed. Removal and replacement can be difficult for the aide and impossible for the impatient. The other 25 typical type comprises a similar siderail structure which has a complicated and expensive hinged mechanism to allow the siderail to be lowered to the floor.
This may be more convenient for the aide, but is impossible for the patient to maneuver if the patient 30 is in the bed.
Accordingly, it is a principal object of the present invention to provide a bed structure which is simple and economical to manufacture and which may be used in a number of applications, including air beds.
- ~Ul~f'7~
A further object of the invention is to provide a air bed which is simple and economical to manufacture and which may be used in nursing homes or private homes.
Another object of the invention is to provide an air flow control valve which inherently produces a low level of noise, which is economical to manufacture, and which may be used for air flow control on air beds.
An additional object of the invention is to provide a single air bag which simulates a plurality of conventional air bags and which may be used for air beds.
Yet an additional object of the invention is to provide a bed siderail which is relatively economical and which is easy to manipulate either by the patient unattended or the patient's aide.
Yet another object of the invention is to provide a device offering the features of an air bed, but one which is highly portable and may be shipped by conventional mail or by commercial parcel delivery services.
Other objects of the invention, as swell as particular features and advantages thereof, will, in part, be obvious and will, in part, be apparent from the following description and the accompanying drawing figures.
Disclosure of Invention The present invention accomplishes the above objects, among others, by providing, in one aspect of the invention, a bed structure having a mattress deck panel and side panels, with internal reinforcing bulkheads and single-piece head- and footboards ~~~~f~'~'~
serving as reinforcing bulkheads at the head and foot of the structure. In another aspect of the invention, there is provided a low-cost air bed employing the above structure. In an additional aspect of the invention, there is provided an air bed which incorporates the air supply and control components within the bed structure itself. In a further aspect of the invention, there is provided a low-noise air flow control pinch valve. In yet another aspect of the invention, there is provided a single air bag which simulates multiple air bags through the use of welded internal baffles. In yet an additional aspect of the invention, there is provided a bed siderail which is patient-operable. In yet a further aspect of the invention, there is provided a device having the features of an air bed, which device is highly portable and which can be shipped by con~~entional mail or by parcel delivery services.
Brief Description of Drawings Figure 1 is an exploded perspective view of bed structure according to the present invention.
Figure 2 is a side elevation view of the assembled bed structure of Figure 1.
Figure 3 is an end elevation view of the assembled bed structure of Figure 1.
Figure 4 is a side elevation view of the assembled bed structure of Figure 1 adapted For use as an air bed.
Figure 5 is a fragmentary exploded perspective view of the siderail structure according to the present invention.
Figure 6 is a detail of Figure 5.
~fl~~~~~
_$_ Figure 7 is a side elevation view of an air bag constructed according to the present invention.
Figure 8 is a top plan view of the air bag of Figure 7.
5 Figure 9 shows diagrammatically the air supply system of the present invention.
Figure 10 is a bottom plan view looking up, with the bottom panel removed, of the air bed of Figure 4.
Figure 11 is a side elevation view of an air 10 flow control~valve according to the present invention.
Figure 12 is a fragmentary, partially sectional, exploded perspective view showing the construction and means of mounting the air filter of Figures 9 and 10.
Figure 13 is a side elevation view of the bed 15 structure of Figure 2 having a portion of the deck thereof inclinable.
Figure 14 is a side elevation view of another embodiment of an air flow control valve according to the present invention.
20 Figure 15 is a cross-sectional top plan view of the flow control valve of Figure 14.
Figure 16 is a perspective view of an alternative embodiment of an air bed system according to the present invention, being transported on a hand 25 truck.
Figure 17 is a perspective view of the air bed system of Figure 16, with the mattress structure thereof deflated and rolled, disposed on a hospital bed.
30 Figure 18 is a fragmentary side elevation view showing the attachment means for the mattress structure of Figure 17 and a mattress cover.
Figure 19 is a perspective view of a patient reposed on the bed system of Figure 16.
~1~~~~
Figure 20 is a perspective view of a patient lying on the air bed system of Figure 16, with a fully inflated mattress structure, but with the mattress cover removed.
Figure 21 is a perspective view of a patient lying on the mattress structure of Figure 20, with the mattress structure partially deflated preparatory to initiating CPR procedures.
Figure 22 comprises two perspective views illustrating means for releasably attaching an air hose to an air bag.
Figure 23 is an end elevation view illustrating a means of attachment of an air bag to a base pad according to the present invention.
Figure 24 is a side elevation view of an alternative mattress structure arrangement according to the present invention.
Figure 25 is an alternative base pad structure according to the present invention.
Figure 26 is a top plan view of the air bags of the mattress structure of Figure 17.
Figure 27 is a perspective view illustrating the means of manufacture of air bags according to the present invention.
Figure 28 is a side elevation view of the means of Figure 27.
Best Mode for Carrying out the Invention Referring now to the Drawing in which identical or similar elements are given the same reference numerals throughout the various figures thereof, Figure 1 is an exploded perspective view of the bed structure of the present invention, generally indicated by the reference numeral 10, and Figures 2, - l o- ~~~.~if~'~~
3, and 4 are, respectively, side elevation, end elevation, and side elevation views of the bed structure assembled, with Figure 4 showing the bed structure adapted for use as an air bed. Bed structure 10 includes first and second deck panels 12 and 14 having flanges 16 and 18 running the length of deck panels 12 and 14, respectively, and extending orthogonally downward from the inner edges thereof.
Flanges 16 and 18 can be joined along the length thereof to form a flat horizontal deck.
Extending orthogonally downward from the outer edges of first and second deck panels 12 and 14, respectively, are side panels 20 and 22. Reinforcing bulkheads 24, 26, and 28 are provided for attachment to deck panels 12 and 14 and side panels 20 and 22.
Completing the basic bed structure are headboard 30 and footboard 32 attached to either end of the structure formed by attached deck panels 12 and 14 and side panels 20 and 22.
Although the basic bed structure may be employed using only the elements described above, its weight capacity would be somewhat limited. Accordingly, a bottom panel 34 may be provided for attachment to bulkheads 24, 26, and 28 and headboard 30 and footboard 32 for greater reinforcement to permit higher weight capacity. As will be described below, bottom panel is also useful when bed structure 10 is to be used in a low loss air bed embodiment.
Reinforcing members 36, 37, 38, and 39 may be provided for attachment at the intersections of deck panels 12 and 14 and side panels 20 and 22 to help provide support for siderail structures, as generally indicated by the reference numerals 42, 43, and 44 -1 1 _ ~.~i~~'~
(Figures 2-4), when such siderail structures are used with bed structure 10.
For convenience in moving bed structure 10, lockable casters, as at 48, 49, and 50, may be provided at the lower edges of side panels 20 and 22.
Deck/side panels 12/20 and 14/22, bulkheads 24, 26, and 28 bottom panel 34 and reinforcing members 36-39 are preferably formed from steel sheet and attached by spot welding or riveting. The foregoing elements may be 18-gauge in thickness. Headboard 30 and footboard 32 are preferably constructed of plastic-faced composition board and attached by means of machine screws, as at 46 (Figure 3). Other materials and attachment methods for the above elements may be employed, if desired.
The seams formed between flanges 16 and 18 and between deck panels 12 and 14 and headboard 30 and footboard 32 are preferably sealed with a suitable conventional sealant to prevent liquids from seeping below the deck panels.
Figure 5 is an exploded perspective view of a portion of a typical siderail structure, generally indicated by the reference numeral 60, and Figure 6 is a detail thereof. Siderail structure 60 includes a mounting boss, generally indicated by the reference numeral 62, which includes a flange portion 64 and a shaft portion 66. Flange portion 64 may be mounted to the side of a bed (not shown) by means of rivets or screws, as at 67. Siderail structure 60 further includes a vertical member 68 and a horizontal gate member 70 formed as an horizontal extension of the vertical member. Defined in the lower end of vertical member 68 is a round opening 72 sized to closely moveably engage shaft portion 66 of mounting boss 62, and a threaded hole 74 extending from one edge of the vertical member to the round opening and sized for moveable engagement with threaded spring-loaded locking pin 76. Completing siderail structure 60, when assembled, is a stop pin 78 fixedly disposed at the lower end of vertical member 68 for moveable engagement with a groove 80 defined in flange 64 of mounting boss 62, a spring washer 82 captured between flat spacers 84 and 86, the latter spacers bearing against flange 64 and the back surface of the vertical member, respectively, a flat spacer captured between the front surface of the vertical member and a retaining ring 88 which releasably engages an annular groove 92 on shaft portion 66 of mounting boss 62, and a trim cap 94 which is attached to the distal end of shaft portion 66.
In use, siderail structure 60 may be rotated 90 degrees between a closed position, as indicated by the positions of siderail structures 42 and 43 on Figure 2~ and an open position, as indicated by the positions of siderail structures 42 and 43 on Figure 4. When in its closed position, stop pin 78 engages the upper end of groove 80, as shown in solid lines on Figure 6, thus holding the siderail structure against clockwise motion. To move siderail structure 60 to its open position, it is rotated 90 degrees counterclockwise so that stop pin 78 engages the lower end of groove 80, as shown in dashed lines on Figure 6, thus preventing further counterclockwise motion of the siderail structure. Because the center of gravity of siderail structure 60 is relatively close to its balance point when the siderail structure is rotated in either direction, it is relatively easy to operate it through a full cycle. To move sidewall structure 60 from its open position, one need only exert relatively light pulling force on it. Thus, sidewall structure 60 is patient-operable.
Spring washer 82 introduces sufficient friction into the movement of siderail structure 60 to impede the motion thereof, thus preventing slamming of the siderail structure from position to position.
If it is desired to lock siderail structure 60 into either its open or its closed position, one engages locking pin into hole 96 or hole 98 (Figure 6), respectively, defined in shaft 66 on mounting boss 62. Locking pin 76 may be engaged into either locked position by rotating the distal end of the spring-loaded pin 90 degrees from the rest position, thereby permitting selective indexing in either open or closed positions.
Siderail structure 60 may be formed of any suitable material, but is preferably formed from die cast aluminum and suitably dimensioned for appropriate strength. Other elements of siderail structure 60 may be constructed of any suitable conventional materials.
In addition to providing a relatively light, easily maneuverable siderail structure, the present invention, employing two siderails on each side of a bed, has an additional advantage. With a partially mobile patient, the siderail structure at the foot of the bed may be opened, while the that at the head of the bed remains locked in its closed position, so as to allow the latter to be used as a hand-hold to assist the patient in exiting and entering the bed.
While bed structure 10 may be used as a light and low- cost support of standard composite mattresses, air mattresses, or water mattresses, it is especially suited for adaptation to use as an air bed, as will be described below.
Referring now to Figure 4, there is shown, in side elevation, bed structure 10 adapted for use as an air bed, including air bags 112, 113, 114, 115, and 116 disposed on the deck (not shown) of the bed 10 structure. Air bags 112-116 are held in place in abutting relationship between headboard 30 and footboard 32 by fastening to the side panels, such as side panel 20 by means of snaps, as at 118. Over air bags 112-116 may be disposed a vapor-permeable 15 mattress pad 120 which is held in place by fastening to side panel 20 by means of snaps, as at 122.
Mattress pad 120 may be a microporous polyurethane-coated nylon fabric.
The construction of a typical air bag, air bag 20 112, is shown in side elevation on Figure 7 and in top plan view on Figure 8. Air bag 112 includes rectilinearly disposed ends 130 and 132, bottom 134, top 136, and sides 138 and 140. Formed as a downward extension of side 138 is a snap flap 142 on which are 25 mounted snaps, as at 118. Disposed internally of air bag 112 are bulkheads 144, 145, and 146 extending between and attached to bottom 134 and top 136.
Bulkheads 144-146 keep top 136 relatively horizontal and simulate in one bag the shape of four conventional 30 air bags. The convex segments thus obtained yieldably support a patient without material wrapping around the patient. The bag elements may be welded either thermally or with RF sealing equipment. The material of the bags is preferrably nylon fabric with an inside -15 - i~'~~.~F '~~
polyurethane coating, an air bag fabric known in the art, with the polyurethane material being that which is fused during welding.
Air is supplied to air bag 112 through a nipple 148, which air inflates the air bag. Nipple 148 extends through a hole 149 (Figure 1) in deck panel 12 for attachment to an air supply hose (element 174 on Figure 10). The air slowly flows from air bag 112 through orifices, as at 150, defined in top 136 of the air bag. This flow of air dries any moisture which may permeate through comforter 120 (Figure 4). The air is preferrably supplied to air bags 112-116 at a flow rate of on the order of about 10 CFM and at a pressure of less than 26mm Hg which is the normal capillary pressure of a normal person. Actual pressures are determined by patient physiology and the need to level the patient's spine for comfort.
The means by which air~.is supplied to air bags 112-116 is shown diagrammatically on Figure 9 and in a fragmentary bottom plan view looking up, with the bottom removed, of bed structure 10 on Figure 10.
Supply air is drawn through an opening 158 defined in bottom 34 near the head end of bed structure 10 (Figure 1), through the internal space of the bed structure, and through a filter 160 by a blower 162, the motor of which is connected to an on/off switch 164 and an electrical supply cord 166. Filter 160 is not shown in proper position on Figure 8, as it. is actually mounted over opening 161 defined in bottom 34 of bed structure 10 (Figure 1), the reason for which is described below.
Air from blower 162 passes through an air silencer 168 and to a manifold 170. From manifold 170, the air flows through air flow control valves, _ 16_ iG~IEiF'~~
such as flow control valve 172 which supplies air bag 112 (Figure 9), and through hoses 174, 175, 176, 177, 178, and 179. Hoses 174-178 supply air to air bags 112-116, respectively, while hose 179 discharges to the atmosphere from flow control valve 180 so as to permit control of the pressure in manifold 170. The pressure in each of air bags 112-116, and therefore the firmness or softness of each bag, can be controlled through adjustment of its associated flow control valve. With the five air bag arrangement, air bag 112 is disposed so as to provide support for the head of the patient's body, air bag 113 for the back, air bag 114 for the seat, air bag 115 for the thigh, and air bag 116 for the foot. It will be understood, for example, that, on Figure 10, air bag supply hose 175 is connected to a nipple (not shown) to supply air bag 113 with air.
Hoses 174-177 pass through bulkheads 24, 26, and 28, as shown on Figure 10, through openings defined in the bul~:heads, as at 182, each of which bulkheads is shown as having defined therein four openings, so as to provide economy in the use of a standard part.
Filter I60 may be a conventional filter/silencer, blower 162 may be a conventional regenerative pressure blower, and silencer 168 may be a conventional silencer, all as are commercially available.
Figure 10 also illustrates how joined flanges 16 and 18 form a reinforcement member along the longitudinal axis of bed structure 10.
Reference to Figures 1 and 10 indicates some of the low noise features of the present invention as applied to air beds. First, the air supply components are disposed in a cavity 190 defined by deck/side panels 12/20 and 18/22, bulkhead 28, footboard 32, and bottom 34, with no openings directly from the cavity to the surroundings. Blower 162 is mounted to deck panel 14 rather than to bottom 34, which mounting position tends to deaden sound and vibrations produced by the blower. Rather than have air enter cavity 190 directly from the surroundings, which would present an opening for the exiting of sound, the air is drawn through opening 158 at the opposite end of bed 10 structure 10 and flows to the cavity at relatively low velocity around baffles 24, 26, and 28 and through holes 182 in the baffles. As described below with reference to Figure 12, filter 160 covers and seals opening 161 in cavity 190.
15 A further aspect of the present invention which affords low noise level is the construction of the flow control valves, such as flow control valve 172 shown in side elevation on Figure 11. Here, control valve 172 is mounted in a frame and includes a section 20 of flexible tubing 202 a portion of the diameter of which may be constricted by the advancement of a convex member 204 disposed at one end of a threaded shaft 206, at the other end of which shaft is fixedly attached a knob 208. Shaft 206 passes through an 25 internally threaded boss 210 which is fixed to frame 200. Preferrably, a lubricant is disposed between tubing 202 and convex member 204. Fitting 212 is connected to tubing 202 to supply air thereto and fitting 214 is connected to the tubing to supply air 30 therefrom. As is evident from Figure 11, rotating shaft 206 so as to advance convex member 204 against the wall of tubing 202 will cause the flow of air through valve 172 to be diminished, while withdrawing convex member 204 will increase the flow of air. It -18 _ ~.'~f"
has been found that the shape formed by tubing 202 as it is constricted inherently causes very little noise to be produced as air flows through the tubing, due to the shallow entry angle and smooth bore, in contrast to the gate valves typically used in such air supply systems, which gate valves are inherently noisy.
Figures 14 and 15 illustrate another embodiment of a flow control valve according to the present invention, generally indicated by the reference numeral 280. Flow control valve includes a generally rectilinear box-shaped bracket or frame 282 through one wall 284 of which frame a partially threaded shaft 286 is rotatably disposed. Shaft 286 may be manually rotated by means of a knob 290 fixedly attached to the distal end of the shaft. Collars 290 and 292 fixed to shaft 286 adjacent either side of wall 284 maintain the shaft in fixed axial relationship with the wall.
The threaded proximal portion of shaft 286 engages the threaded end of a yoke 294 the arms of which extend through a slot 296 formed in a wall 298 of frame 282. Assuming a normal right hand thread on shaft 286, it can be seen from Figures 14 and 15 that rotation of shaft 286 in the clockwise direction will cause yoke 294 to be drawn to the right, while rotation of shaft 286 in the counterclockwise direction will cause yoke 294 to be pushed to the left.
Fixed to the outer side of wall 298 and maintaining yoke 294 in slot 296 is an anvil 300 having an outwardly convex cylindrical shape.
Disposed within the arc formed by the joined arms of yoke 296 is a flexible tube 302 which has a fitting 304 at one end thereof to supply air thereto and a fitting 306 at the other end thereof to supply air therefrom. Tube 302 is disposed so that its axis is parallel to the axis of cylindrical anvil 300.
It can be seen from inspection of Figures 14 and 15 that rotation of shaft 286 in the clockwise 5 direction will cause yoke 294 to press tube 302 against anvil 300 resulting in the formation of a constriction of the tube between the yoke and the anvil, thus decreasing the rate of flow of air therethrough. Substantially the entire periphery of tube 302 is contained at the plane of constriction, with yoke 294 engaging at least one-half the outer periphery of tube 302 and anvil 300 engaging a large portion of the balance of the outer periphery of the tube, so that very precise and repeatable flow control may be achieved.
It has been found that PVC tubing is an especially suitable material for tubing 202 and, for the above application, tubing with a 5/8-inch ID and a 1/8-inch r,~all thickness is preferable.
20 Figure 12 is a exploded perspective detail view showing the arrangement of filter 160. Filter 160 includes a pleated filter element 240 which fits concentrically in a housing 242 and an end cap 244 which fits over the end of the filter element and is 25 held in place, and holds the filter element in the housing and the housing on a plate 246, by means of a wing nut 248 which engages the threaded end of a retaining stud 250 attached to one end of the end cap and which is passed through a hole 252 on the plate.
30 A hose 254 is attached to the other end of end cap 244 to supply filtered air to blower 162 (Figures 9 and 10).
Filter 160 is mounted to, and closes, opening 161 in bottom panel 34 by engaging a flange 256 formed on plate 246 with an edge 258 of the opening, as shown by the dashed arrows, and then rotating the plate into 5 its closed position against the bottom panel, also as shown by the dashed arrows, and securing it in that position by inserting the threaded end of a mounting screw 260 through a hole 262 formed in the plate and then advancing the mounting screw into a threaded hole 264 formed in the bottom panel.
When thus mounted, air enters filter 160 from cavity 190 (Figure 10), flows around end cap 244 into the annulus defined between filter element 240 and housing 242, through the filter element, and then 15 through hose 254 attached to the end cap. Air is thus supplied to blower 162 without having any opening directly from cavity 190 to the surroundings, which opening could be a conduit for the transmission of airbourne noise.
20 The placement of filter 160, as shown on Figure 12, permits easy access thereto for cleaning or replacement of filter element 240 by simply loosening retaining nut 262 and swinging the filter away from opening 161.
25 Figure 13 is a side elevation view of the bed structure of the present invention showing an embodiment thereof in which a portion of the bed deck is inclinable, in which figure, elements the same as, or similar to those shown on~Figures 1-4 are given 30 primed reference numerals. Here, bed structure 10' is constructed the same as bed structure 10, but first and second deck panels 12' and 14' are divided athwart the bed structure so as to form the top of an inclinable portion 220. Likewise, first and second side panels 20'and 22' are divided (only panel 20' visible) to form the sides of inclinable portion 220, and headboard 30' is divided as shown. Deck panels 12' and 14' may be provided with a hinge structure at 5 222 and filler panels, as at 224, may be provided for safety. An upper bottom panel 226 may be provided along at the bottom of inclinable portion 220 extending between side panels 20' and 22' and headboard 30'and a lower top panel 228 may be provided 10 extending between the side panels and the headboard.
The means by which inclinable portion 220 is raised may be any conventional mechanism known in the art, and may be the telescoping mechanism 230 shown on Figure 13, and the mechanism used may be adapted by 15 conventional means known in the art to be patient operable.
Inclinable portion 220 permits adjustment of bed structure 10' so that a patient may be placed in a convenient posture for reading or eating. A similar 20 inclinable portion may be provided at the foot of bed structure 10' instead of, or in addition to, inclinable portion 220.
Bed structure 10' is preferably constructed according to the techniques shown and described above 25 with reference to bed structure 10 and may also be adapted for use as an air bed as taught above.
Figures 16-21 illustrate an air bed system, generally indicated by the reference numeral 400, which, among other features, is highly portable and 30 which may be employed in a variety of circumstances.
Referring now to Figure 16, in which bed system 400 is shown ready for shipping or other relocation, bed system includes only three major elements: a low loss air mattress structure 12, shown deflated and _ 2 2 _ iG~U~.~~'~
secured in a roll, an air supply 14, and a coil of four air hoses 406-409. As can be seen from Figure 16, the entire system is secured to a small hand cart 412 for easy transport. Alternatively, bed system 400 could be boxed and, when so boxed, the overall dimensions thereof are, for example, well within the maximum dimensions set by the United Parcel Service of (girth + length =) 130 inches maximum and the weight thereof is less than the UPS maximum of 70 pounds, as well as within the maximum dimensions set by the United States Postal Service of (girth + width =) 100 inches maximum and the weight thereof is less than the LISPS maximum of 70 pounds. Thus, a complete low loss air bed system can be sent across the United States for a very modest sum and can be air-freighted anywhere in the world also at relatively low cost.
In Figure 17, mattress structure 402, still in its deflated and rolled state, has been placed on the springs 420 of a standard articulated hospital bed, generally indicated by the reference numeral 422;
although, it will be apparent from inspection of the drawing figures and from the following description that the bed system would work quite satisfactorily if the mattress structure were placed on any type of bed or even, if necessary, on a large table or on a floor. Air supply 404 has been conveniently hung from a bracket 424 which has been placed over the horizontal frame members of bed 422 and air supply hoses 406-409 have been connected to the air supply.
It may be assumed that air supply 404 is similar to that described with reference to Figures 9 and 10, except that this air supply has been provided with its own, conventional housing.
On Figure 18, mattress structure 402 has been unrolled on bed 422 and inflated. Mattress structure 402 comprises, in this case, four air bags 440-443 (only a portion of 443 visible on Figure 18) of the 5 type described above with reference to Figures 4, 7, and 8, attached to a base pad 446. Base pad 446 has attached thereto a plurality of straps, as at 448, which are buckled around the horizontal members of the frame of bed 422 and which hold mattress structure 402 10 firmly in position on the bed. Disposed on strap 448 is a snap fitting 450 which may be used for attachment thereto of a complementary snap fitting 452 on a strap 454 attached to a mattress cover 456 of the type described above. Thus, mattress cover 456 is firmly 15 held in position over mattress structure 402 without slipping.
As can be seen on Figure 18, air bag 443 is inflated by means of hoses 409 attached thereto.
Figure 19 shows bed 422 and bed system 400 with 20 a patient reposed thereon, the bed having the back and knee portions thereof elevated. This figure illustrates and important advantage of the air bags of the present invention. ~'ith conventional air bags, the ends of the air structure must be supported so 25 that the air bags do not spill over the ends of the bed. Here, as can be seen on Figure 19, the structural rigidity of the air bags of the present invention permit elevating the head~section of bed 422, yet no special provision need be made to support 30 the end of air bag 443 (under mattress cover 456) on that section.
Figures 20 and 21 illustrate how bed system 400 may be made ready quickly for cardiopulmonary resuscitation (CPR) procedures, which require that the patient's back be supported on a firm surface in order to perform manual chest compressions on the patient.
Figure 20 shows a patient lying on a fully inflated mattress structure 402. (For greater clarity, 5 mattress cover 456 is not shown on Figures 20 and 21.) When CPR procedures are indicated, an attendant (not shown) deflates air bags 442 and 443 by grasping the ends of air hoses 408 and 409 at their connections to the air bags and disconnecting them. On Figure 21, 10 the attendant has disconnected air hoses 408 and 409 from air bags 442 and 443 which have deflated, thus lowering the back and seat portions of the patient to be supported on the surface of base pad 446 (base pad not visible on Figure 21). CPR can now be started by 15 a person climbing on top of the bed and beginning the procedure. Keeping the foot and thigh portions of mattress structure 402 inflated is preferred, as that causes blood to flow to the head of the patient. The deflation can be accomplished in 8-15 seconds and the 20 air supply controls do not have to be touched.
Figure 22 illustrates a preferred method of assuring that the air hoses remain attached to the air bags and cannot be accidentally disconnected. Since bed system 400 is designed to be portable, it is 25 necessary that the ends of the hoses ma~~ be secured in any orientation in which they may happen to be connected to the air bags. Here, the end of a typical air hose 466 is attached to an elbow connector 468 sized to fit over a flanged nipple 470 attached to an 30 air bag 472. A plate 474 rotatingly disposed on nipple 470 has attached thereto the ends of straps 476 and 478. After hose 466 is connected to air bag 472, straps 476 and 478 are placed over the hose and connected together by means of a buckle (not shown) or they may be Velcro material has shown) and require no separate mechanical connecting mechanism. Thus, regardless of the orientation of hose 466 about nipple 470, plate 474 may be rotated so that straps 476 and 5 478 can be positioned to releasably hold hose 466 securely in place.
The embodiment being described includes having air hose connections to the sides of the air bags.
Alternatively, within the intent of the present 10 invention, air hose connections could be furnished on the bottoms of the air bags. The former arrangement is preferred, however, since it offers greater flexibility in the types of surfaces with which the bed system may be employed.
15 As illustrated above, base pad 446 is a single piece of material and it has been found that a preferred material is 1/8-inch thick neoprene rubber, especially when mattress structure 402 is to be placed over springs; although, any suitable material may be 20 employed, provided it has sufficient flexibility to be rolled or folded into a suitable shape for shipping.
For example, other synthetic rubber materials, reinforced or not, fabric mats, or even slats interleaved with webbing, as illustrated on Figure 25 25 may be employed. The bottom panels of the air bags may also serve as base pads, Figure 24 illustrating how such air bags could be joined together by means of snaps, as shown, or by other mechanical means.
Figure 23 illustrates how air bags 440-443 are 30 preferably attached to base pad 446. Here, air bag 440 is shown as being attached to base pad 446 by means of a plurality of snap fittings, as at 484 and 486.
Bed structure 10 described above employed five air bags 112-116, each having four compartments.
While that arrangement is quite satisfactory, it has been found that the arrangement of air bags 440-443 5 can improve patient comfort in some cases. Figure 26 illustrates such an arrangement wherein it can be seen that each of air bags 440 and 443 has seven compartments, while each of air bags 441 and 442 has four compartments.
10 Figure 27 illustrates the preferred method of fabricating an air bag. Here, there is first formed an open sleeve, generally indicated by the reference numeral 490, comprising bottom 492, top 494, and sides 496 and 498. Then, bulkheads 500-505 are positioned 15 over fixture 508 and the fixture with the bulkheads thereon is inserted in sleeve 490. Referring now to Figure 28, sleeve 490 is then placed on a base plate 512 and an RF platen is lowered to top 494 of the sleeve. RF energy heats fixture 508 and the upper and 20 lower edges of bulkheads 500-505 are thereby welded to top 494 and bottom 492. Finally, the ends of the air bag are welded to either end of the sleeve to complete the fabrication. Such a method of fabrication provides a rapid and economical method of fabricating 25 air bags or similar articles having internal bulkheads. Fixture 508 is preferably aluminum or brass.
It will thus be seen that the objects set forth above, among those made apparent from the preceding 30 description and the accompanying drawing figures, are efficiently attained and, since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown on the accompanying drawing figures shall be interpreted as illustrative only and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
Claims (11)
1. A siderail for a bed, adapted for attachment to one side of raid bed in a plane parallel to the plane of said one side of said bed, comprising:
a) a first member joined to said one side of said bed and adapted for rotation in said plane parallel to the plane of said one side of said bed from a first position wherein said first member is substantially vertical to a second position wherein said first member is substantially horizontal; and b) a second member which extends from the first member such that when said siderail is in said first position, said second member impedes an occupant of said bed from exiting therefrom and when said siderail is in said second position, said second member does not impede an occupant of said bed from exiting therefrom.
a) a first member joined to said one side of said bed and adapted for rotation in said plane parallel to the plane of said one side of said bed from a first position wherein said first member is substantially vertical to a second position wherein said first member is substantially horizontal; and b) a second member which extends from the first member such that when said siderail is in said first position, said second member impedes an occupant of said bed from exiting therefrom and when said siderail is in said second position, said second member does not impede an occupant of said bed from exiting therefrom.
2. The siderail as set forth in claim 1 wherein said first member rotates through at least 90 degrees.
3. The siderail as set forth in claim 1 or 2 wherein said second member is substantially vertical when said siderail is in said second position.
4. The siderail as set forth in claim 1, 2 or 3 wherein said bed has a first end and a second end and wherein said first member is attached to said one side of said bed at a point closer to one of said first or second ends than to the midpoint therebetween.
5. The siderail as set forth in claim 4 wherein the length of said second member is less than the length of said bed.
6. The siderail as set forth in claim 1 wherein said siderail can be selectively locked in either said first position or said second position.
7. A siderail for a bed, said siderail to be attached to one side of said bed and being rotatable in a plane parallel to the plane of said one side to which it is attached, said siderail comprising:
a) a vertical member;
b) gage means formed solely as an horizontal, unidirectional extension of said vertical member so as to serve as a barrier when said siderail is in its closed position; and c) rotation means disposed at the lower end of said vertical member to permit rotation of said siderail only 90 degrees such that said unidirectional extension extends vertically when said siderail is in its open position.
a) a vertical member;
b) gage means formed solely as an horizontal, unidirectional extension of said vertical member so as to serve as a barrier when said siderail is in its closed position; and c) rotation means disposed at the lower end of said vertical member to permit rotation of said siderail only 90 degrees such that said unidirectional extension extends vertically when said siderail is in its open position.
8. A siderail for a bed as set forth in claim 7 wherein said siderail is rotatable 90 degrees between an open position and a closed position.
9. A siderail for a bed as set forth in claim 8 wherein said siderail is adapted to be releasably selectively locked in either its open or its closed positions.
10. A siderail for a bed as set forth in claim 7 wherein said means to permit rotation of said siderail comprises:
a) a mounting boss fixedly attached to said one of said sides;
b) an opening defined in the lower end of said vertical member sized to closely fit said mounting boss; and c) means to rotatably hold said opening in engagement with said mounting boss thereby to support said vertical member thereon.
a) a mounting boss fixedly attached to said one of said sides;
b) an opening defined in the lower end of said vertical member sized to closely fit said mounting boss; and c) means to rotatably hold said opening in engagement with said mounting boss thereby to support said vertical member thereon.
11. A siderail for a bed as set forth in claim 1 wherein said means to permit rotation of said siderail further comprises spring means to impede the free rotation of said siderail while said siderail is being rotated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36456589A | 1989-06-05 | 1989-06-05 | |
| US07/364,565 | 1989-06-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2016673A1 CA2016673A1 (en) | 1990-12-05 |
| CA2016673C true CA2016673C (en) | 2001-02-06 |
Family
ID=23435068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002016673A Expired - Fee Related CA2016673C (en) | 1989-06-05 | 1990-05-14 | Bed system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2016673C (en) |
-
1990
- 1990-05-14 CA CA002016673A patent/CA2016673C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2016673A1 (en) | 1990-12-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
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Effective date: 20050516 |