Abstract:
A transfer mattress includes an upper mattress having three longitudinally oriented plenums and three separate inlet/outlet valves that are each arranged in airflow communication with their respective plenum. First and second of the plenums are arranged in airflow communication with one another while a central plenum is arranged in airflow isolation from the first plenum and the second plenum so that the first and second plenums may be inflated and deflated independently of the central plenum. A lower inflatable mattress is separated by a common wall from the upper mattress. A lower inlet/outlet valve is arranged in airflow communication with a lower plenum defined by the lower inflatable mattress. A bottom wall defines a plurality of perforations so that when the lower plenum is charged with pressurized air, it escapes under pressure through the perforations to create an air bearing under the mattress. A method for transporting a patient in comfort is also provided by the invention.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This patent application is a continuation of U.S. patent application Ser. No. 11/751,864, entitled “PARTIALLY DEFLATABLE TRANSFER MATTRESS AND METHOD FOR TRANSPORTING A PATIENT IN COMFORT,” filed on May 22, 2007 and assigned to the same assignee as this application. The aforementioned patent application is expressly incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention generally relates to patient transfer devices and, more particularly to a patient transfer apparatus which employs an air bearing to facilitate the transfer. 
       BACKGROUND OF THE INVENTION 
       [0003]    Patient handling mattresses are known in the art which include at least two flexible material sheets that together define a plenum chamber, with at least one sheet being perforated with small pinholes over at least a central surface area, and which open up directly to the interior of the plenum chamber. Such prior art mattresses are used by arranging the perforated sheet so that it faces an underlying fixed, generally planar support surface such as a floor or table. When the mattress is charged with pressurized air the escape of air under pressure through the pinholes acts initially to jack a load placed upon the mattress above the perforated flexible sheet, and thereby creates an air bearing of relatively small height between the underlying fixed, generally planar support surface and the perforated flexible sheet. 
         [0004]    For example, in U.S. Pat. No. 4,517,690, issued to Wegener, an air pallet is disclosed that is formed from upper and lower thin flexible film sheets sealed at their edges to form a plenum chamber. Wegener&#39;s air pallet functions to move a load with minimal friction over an underlying generally planar fixed support surface. The bottom thin flexible material sheet is perforated by small diameter perforations such as pin holes at the load imprint area. 
         [0005]    In U.S. Pat. No. 5,561,873, issued to Weedling, provides an inflatable flexible pallet within which an array of structurally interrelated inflatable chambers are formed to support a load when inflated. The flexible pallet is configured to resist lateral and longitudinal shrinkage of the load support surface, as well as ballooning and hot dogging. Rotational instability is also reduced by providing a greater load surface support area. 
         [0006]    In U.S. Pat. No. 6,073,291, issued to Davis, an inflatable medical patient transfer apparatus is disclosed that has a combination of transverse partition members and a raised perimeter section to reduce deleterious ballooning and uneven inflation as well as quick emergency deflation. Additional differentially inflatable patient rolling chambers are disclosed on the top of the transfer apparatus to provide assistance to medical personnel in beginning to roll patients reclining or lying upon the transfer apparatus, particularly in a deflated condition on a hospital bed. 
         [0007]    In U.S. Pat. No. 7,107,641, issued to Davis, a double chambered transfer mattress is provided capable of partial deflation that includes a top inflatable mattress and a bottom inflatable mattress that are separated by a common wall from one another. A selectable inlet/outlet valve is arranged for airflow communication between an interior chamber of the bottom inflatable mattress and a source of pressurized air. A one-way valve is positioned through the common wall so as to provide selective air flow communication between the top inflatable mattress and the bottom inflatable mattress so that when the inlet/outlet valve is opened, so as to deflate the bottom inflatable mattress, the one-way valve is actuated so as to prevent deflation of the top inflatable mattress. 
         [0008]    All of the foregoing devices have suffered from an inability to be used on a patient transfer vehicle, e.g., a typical wheeled hospital bed or gurney, when fully or even partially inflated. Such patient transfer vehicles often include a frame, a patient pallet supported by the frame, and a pair of side rails that are movably coupled to the frame for movement between a raised position and a lowered position relative to the patient pallet&#39;s surface. When an inflated prior art transfer mattress is placed upon the patient pallet&#39;s surface, and an attempt is made to lift the side rails into their raised position, they collide with the margins of the inflated transfer mattress. This has required the complete deflation of such transfer mattresses while resident upon a patient transfer vehicle, resulting in discomfort for the patient. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention provides a mattress having three adjacent longitudinally oriented plenums at least two separate inlet/outlet valves, one of which is arranged in airflow communication with a respective two of the three adjacent plenums. In one embodiment, two of the plenums are spaced apart from one another but arranged in airflow communication with one another, while a third of the plenums is located between the spaced apart plenums. The third plenum is arranged in airflow isolation from the communicating plenums so that the communicating plenums may be inflatable or deflatable independently of the third plenum. 
         [0010]    In an alternative embodiment, a transfer mattress is provided that includes an upper mattress that defines a first longitudinally oriented plenum having a first inlet/outlet valve arranged in airflow communication with the first plenum, a central longitudinally oriented plenum having a central inlet/outlet valve arranged in airflow communication with the central plenum, and a second longitudinally oriented plenum having a second, optional inlet/outlet valve arranged in airflow communication with the second plenum. The first and second plenums are arranged in airflow communication with one another while the central plenum is arranged in airflow isolation from the first plenum and the second plenum. In this way, the first and second plenums may be inflated and deflated independently of the central plenum so as to allow for the positioning of the mattress on support surfaces of varying width. A lower inflatable mattress is separated by a common wall from the upper mattress. A lower inlet/outlet valve is arranged in airflow communication with a lower plenum defined by the lower inflatable mattress. A bottom wall defines a plurality of perforations so that when the lower plenum is charged with pressurized air through the lower inlet/outlet valve, the escape of the air under pressure through the perforations creates an air bearing. 
         [0011]    In a further embodiment, a transfer mattress is provided that includes an upper mattress that defines a first longitudinally oriented plenum having a first inlet/outlet valve arranged in airflow communication with the first plenum, a central longitudinally oriented plenum having a central inlet/outlet valve arranged in airflow communication with the central plenum, and a second longitudinally oriented plenum. The first and second plenums are arranged in airflow communication with one another while the central plenum is arranged in airflow isolation from the first plenum and the second plenum. In this way, the first and second plenums may be inflated and deflated independently of the central plenum so as to allow for the positioning of the mattress on support surfaces of varying width. A lower inflatable mattress is also provided that is separated by a common wall from the upper mattress. A lower inlet/outlet valve is arranged in airflow communication with a lower plenum defined by the lower inflatable mattress. A bottom wall of the lower mattress defines a plurality of perforations so that when the lower plenum is charged with pressurized air through the lower inlet/outlet valve, the escape of that air under pressure through the perforations creates an air bearing. 
         [0012]    A method for transporting a patient in comfort is also provided wherein a patient is positioned upon a transfer mattress formed in accordance with anyone of the foregoing embodiments comprising three adjacent longitudinally oriented plenums wherein at least one of the plenums is pressurizable independently of the other two plenums. The transfer mattress is then moved from a first location to a mobile transport device, e.g., a patient gurney, of the type that often have adjustable side railings. Two out of the three plenums are then deflated so that the patient is supported only upon the at least one of the plenums that is independently pressurizable. The patient is then transported upon the mobile transport, often with the adjustable railing arranged in position on either side of the patient without interference or obstruction by the deflated portions of the transfer mattress. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    These and other features and advantages of the present invention will be more fully disclosed in, or rendered obvious by, the following detailed description of the preferred embodiments of the invention, which are to be considered together with the accompanying drawings wherein like numbers refer to like parts and further wherein: 
           [0014]      FIG. 1  is a perspective view of a multichambered mattress formed in accordance with the present invention; 
           [0015]      FIG. 1A  is a perspective view, partially broken-away of a multichambered mattress formed in accordance with the present invention in combination with a transfer mattress formed in accordance with the present invention; 
           [0016]      FIG. 1B  is a perspective view, partially broken-away of a multichambered mattress, having a single perimeter seal formed in accordance with the present invention in combination with a transfer mattress formed in accordance with the present invention; 
           [0017]      FIG. 2  is a further perspective view of the multichambered mattress formed in accordance with the present invention in combination with a transfer mattress formed in accordance with the present invention shown in  FIG. 1A , with an end portion cutaway for clarity of illustration; 
           [0018]      FIG. 3  is a cross-sectional view of the multichambered transfer mattress shown in  FIG. 2 , as taken along lines  3 - 3 ; 
           [0019]      FIG. 4  is a cross-sectional view of the multichambered transfer mattress shown in  FIG. 2 , as taken along lines  4 - 4 ; 
           [0020]      FIG. 5  is a perspective view of the multichambered transfer mattress shown in  FIGS. 1 and 2 , with a bottom plenum deflated; 
           [0021]      FIG. 6  is a cross-sectional view of the multichambered transfer mattress shown in  FIG. 5 , as taken along lines  6 - 6 ; 
           [0022]      FIG. 7  is a perspective view of the multichambered transfer mattress shown in  FIGS. 1 and 2 , with a bottom plenum and side plenums deflated; 
           [0023]      FIG. 8  is a cross-sectional view of the multichambered transfer mattress shown in  FIG. 7 , as taken along lines  8 - 8 ; 
           [0024]      FIG. 9  is a perspective view of the multichambered transfer mattress shown in  FIGS. 1-2 , positioned atop a support surface, with its lower plenum deflated, and prior to transfer to a mobile transport device; 
           [0025]      FIG. 10  is a perspective view of the multichambered transfer mattress shown in  FIG. 9 , positioned atop a support surface, with its lower plenum inflated, and ready to transfer to a mobile transport device; 
           [0026]      FIG. 11  is a perspective view of the multichambered transfer mattress shown in  FIG. 10 , positioned atop a mobile transport device with its lower plenum inflated, but with the side rails of the mobile transport device fully retracted; 
           [0027]      FIG. 12  is a perspective view of the multichambered transfer mattress shown in  FIG. 11 , positioned atop a mobile transport device with its lower plenum and side communicating plenums deflated, and ready for the side rails of the mobile transport device to be fully extended; 
           [0028]      FIG. 13  is a perspective view of the multichambered transfer mattress shown in  FIG. 12 , positioned atop a mobile transport device with its lower plenum and side communicating plenums deflated and with the side rails of the mobile transport device fully extended; and 
           [0029]      FIG. 14  is an end view of the multichambered transfer mattress shown in  FIG. 13 , positioned atop a mobile transport device with its lower plenum and side communicating plenums deflated and with the side rails of the mobile transport device fully extended. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0030]    This description of preferred embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description of this invention. The drawing figures are not necessarily to scale and certain features of the invention may be shown exaggerated in scale or in somewhat schematic form in the interest of clarity and conciseness. In the description, relative terms such as “horizontal,” “vertical,” “up,” “down,” “top” and “bottom” as well as derivatives thereof (e.g., “horizontally,” “downwardly,” “upwardly,” etc.) should be construed to refer to the orientation as then described or as shown in the drawing figure under discussion. These relative terms are for convenience of description and normally are not intended to require a particular orientation. Terms including “inwardly” versus “outwardly,” “longitudinal” versus “lateral” and the like are to be interpreted relative to one another or relative to an axis of elongation, or an axis or center of rotation, as appropriate. Terms concerning attachments, coupling and the like, such as “connected” and “interconnected,” refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. The term “operatively connected” is such an attachment, coupling or connection that allows the pertinent structures to operate as intended by virtue of that relationship. In the claims, means-plus-function clauses, if used, are intended to cover the structures described, suggested, or rendered obvious by the written description or drawings for performing the recited function, including not only structural equivalents but also equivalent structures. 
         [0031]    Referring to  FIGS. 1-4 , a partially deflatable, multichambered transfer mattress  2  is provided that includes a top panel  4 , a barrier panel  6 , a bottom panel  8 , at least two longitudinal baffle-panels  10 , a plurality of transverse baffle-panels  12 , a top perimeter band  14 , and a bottom perimeter band  16 . More particularly, top panel  4  has a top surface  20  and a peripheral edge  22 , and often comprises a rectangular shape. Barrier panel  6  includes a top inner surface  24 , a bottom inner surface  26 , and a peripheral edge  29 , and is substantially the same in length and width as top panel  4 . Bottom panel  8  has a peripheral edge  30 , and includes a plurality of perforations  32  that are defined through its thickness to allow air, that is supplied by a high-pressure air supply to partially deflatable multichambered transfer mattress  2  via an air supply hose  34 , to escape in a controlled manner. A portion of the air supplied to partially deflatable, multichambered transfer mattress  2  escapes through plurality of perforations  32 , providing a weight-bearing cushion of air that facilitates the sliding of partially deflatable, multichambered transfer mattress  2  along a surface, as well as, from one surface to another. 
         [0032]    Longitudinal baffle-panels  10  each comprise substantially rectangular sheets, and include a top edge  38 , a bottom edge  40 , and in some embodiments a through-hole  42 . Each Longitudinal baffle-panel  10  preferably has substantially the same length as top panel  4  and barrier panel  6  and, in embodiments that do not feature a single perimeter seal ( FIG. 1B ) substantially the same width as top perimeter band  14 . Two longitudinal baffle panels  10  are installed within an upper portion of partially deflatable, multichambered transfer mattress  2 , so as to form a first plenum  46 , a central plenum  48 , and a second plenum  50  that are peripherally enclosed by top perimeter band  14 . A conduit  51  is arranged in flow communication with each of through-holes  42  so that first plenum  46  and second plenum  50  are in airflow communication with one another, and in airflow isolation from central plenum  50 . Plurality of transverse baffle-panels  12  each often have a substantially rectangular shape, and include a top edge  54  and a bottom edge  56 . Baffle-panels  12  may have differing widths, depending upon their position within a lower plenum  60  of partially deflatable, multichambered transfer mattress  2 . Transverse baffle panels  12  are installed within lower plenum  60  of partially deflatable, multichambered transfer mattress  2 , with each top edge  54  being fastened transversely to a portion of bottom inner surface  26  and bottom edge  56 . 
         [0033]    Top perimeter band  14  and a bottom perimeter band  16  often take the form of elongate, rectangular strips of material. Top perimeter band  14  is sealingly fastened between peripheral edge  22  of top panel  4  and peripheral edge  29  of barrier panel  6 , e.g., by heat sealing, gluing or sewing, so as to complete the formation of first plenum  46 , central plenum  48 , and second plenum  50 . Bottom perimeter band  16  is sealingly fastened between peripheral edge  29  of barrier panel  6  and peripheral edge  30  of bottom panel  8 , so as to complete the formation of lower plenum  60 . 
         [0034]    At least one inlet/outlet opening  65  is formed in bottom perimeter band  16  that sealingly accepts an air supply hose  34 . Inlet opening  65  is sized and shaped so that air supply hose  34  may be inserted, with the inlet being thereafter snapped shut or otherwise closed to hold air supply hose  34  in place while lower plenum  60  is charged with pressurized air. Inlet opening  65  may also include a valve (not shown) that is biased to be normally closed to prevent air from exiting through the inlet, and opened when air supply hose  34  is inserted into inlet opening  65 . Other arrangements known to those skilled in the art may be used to inflate lower plenum  60 . Top perimeter band  14  includes at least two and often three inlet/outlet openings  70   a,   70   b,   70   c,  that also sealingly accept air supply hose  34 . Inlet/outlet opening  70   a  is arranged in flow communication with first plenum  46 , inlet/outlet opening  70   b  is arranged in flow communication with central plenum  48 , and inlet/outlet opening  70   c  is arranged in flow communication with second plenum  50 . Of course, as a result of conduit  51  being arranged in flow communication with each of through-holes  42  so that first plenum  46  and second plenum  50  are in airflow communication with one another, and in airflow isolation from central plenum  50 , only one of  70   a,   70   c  need be provided in order to initiate inflation or deflation of first plenum  46  and second plenum  50 . 
         [0035]    It should be understood that some or all of top panel  4 , barrier panel  6 , bottom panel  8 , longitudinal baffle-panels  10 , transverse baffle-panels  12 , top perimeter band  14 , and bottom perimeter band  16 , are most often, but not always formed from a sheet of fabric, e.g., nylon scrim or the like, and may be coated on at least their outer surfaces with a water proof coating. The water proof coating may be any of the well known polymeric or elastomeric compounds that are known to be impervious to semi-solids and liquids, such as, blood, urine, feces, hospital strength disinfecting compounds, alcohol, or the like. For example, a nylon twill fabric that is coated on one side with a heat sealable, polyurethane coating (e.g., an inner side) and the outer side coated with a durable water repellant (patient side). A practical benefit associated with the use of the foregoing materials is that partially deflatable, multichambered transfer mattress  2  retains a better appearance for longer periods of time during use. 
         [0036]    Alternatively, in those instances where a single use, single patient mattress is provided, i.e., where patient use lasting less than twenty four hours is desired, some or all of top panel  4 , barrier panel  6 , bottom panel  8 , longitudinal baffle-panels  10 , transverse baffle-panels  12 , top perimeter band  14 , and bottom perimeter band  16  may be made of materials, such as, acetate, acrylic, anidex, aramid, azlon, cotton, elastoester, fluorocarbon, fur, glass, lyocell, melamine, metallic, modacrylic, modal, mosacrylic, novoloid, nylon, nytril, olefin, PAN, PBI, PEEK, Pelco, PEN, PLA, PTT, polyester, polyester-polyarylate, rayon, saran, spandex, sulfar, triacetate, vinal, vinyon, and wool, and including blends and partially blends of these materials together or with other compatible materials. A common characteristic of the foregoing and like materials is their propensity to stain or discolor as a result of contact with blood, urine, feces, hospital strength disinfecting compounds, alcohol, or the like. Additionally, a variety of films may be used to form a single patient, single use partially deflatable, multichambered transfer mattress  2 , for example, copolyester, copolyether, ethylene vinyl acetate, fluorocarbon, polyamide, olefins, polybutylene, polycarbonate, polyester, polystyrene, polyurethane, polyvinyl, alcohol, polyvinyl chloride, polyvinyl fluoride, and polyvinylidene chloride and including blends and partially blends of these materials together or with other compatible materials. A practical benefit associated with the use of the foregoing preferred materials is that partially deflatable, multichambered transfer mattress  2  retains a stained and discolored appearance for longer periods of time after use thereby alerting hospital staff or other care givers that a particular partially deflatable, multichambered transfer mattress  2  has completed its useful life, and must be discarded. 
         [0037]    In one embodiment, some or all of top panel  4 , barrier panel  6 , bottom panel  8 , longitudinal baffle-panels  10 , transverse baffle-panels  12 , top perimeter band  14 , and bottom perimeter band  16  may comprise a cold water soluble partially hydrolyzed polyvinyl alcohol, cold water insoluble hot water disintegrable aliphatic polyester, and minor proportions of processing and performance aids. The aliphatic polyester has a melt temperature above the normal body temperature of a human (37 degrees C.; 98.6 degrees F.) and is present in the resin blend at a concentration sufficient to constitute the continuous phase of the blend, with the polyvinyl alcohol constituting a discontinuous phase of the blend. The aliphatic polyester renders the resin blend, and the partially hydrolyzed polyvinyl alcohol in the blend is, cold water insoluble and determines the temperature at which articles formed from the blend will be subject to dissolution in an aqueous bath and subsequent disposal. A practical benefit associated with the use of the foregoing material is that partially deflatable, multichambered transfer mattress  2  not only retains a stained and discolored appearance for longer periods of time after use, thereby alerting hospital staff or other care givers that a particular partially deflatable, multichambered transfer mattress  2  has completed its useful life, and must be discarded, but also if an attempt is made to launder the mattress after a single use it disintegrates during the washing process. 
         [0038]    A partially deflatable, multichambered transfer mattress  2  is assembled according to the present invention in the following manner. Bottom panel  8  is laid out on a suitable support surface so that baffle-panels  12  may be transversely arranged in the center section of the inner surface of bottom panel  8 . Once in this position, bottom edge  56  of each transverse baffle-panel  12  is fixedly fastened, e.g., via heat sealing, ultrasonic welding, or adhesive, to the inner surface of bottom panel  8 . In this way, a re-solidified interface structure is formed so as to improve the bond and its resistance to rupture under normal loading. Once transverse baffle-panels  12  are fastened to the inner surface of bottom panel  8 , barrier panel  6  is arranged in overlying confronting relation with bottom panel  8  so that each top edge  54  of each transverse baffle-panel  12  may be fixedly fastened to bottom inner surface  26  of barrier panel  6 , e.g., via heat sealing, ultrasonic welding, or adhesive. 
         [0039]    At this stage of the construction, longitudinal baffle-panels  10  may be arranged in spaced-apart, substantially parallel relation to one another on top inner surface  24  of barrier panel  6 . Once in this position, bottom edge  40  of each longitudinal baffle-panel  10  is fixedly fastened to top inner surface  24  of barrier panel  6 . Longitudinal baffle-panels  10  are heat sealed along the interface between bottom edge  40  and top inner surface  24  of barrier panel  6 . This heat sealing may be done with the application of heat or ultra sonic energy at the edge interface. In this way, a re-solidified interface structure is formed so as to improve the bond and its resistance to rupture under normal loading. Also, conduit  51  may be arranged in flow communication with each of through-holes  42  and similarly fastened to each of longitudinal baffle-panels  10 . [ 0040 ] Once each longitudinal baffle-panel  10  is fastened to top inner surface  24  of barrier panel  6 , top panel  4  is arranged in overlying confronting relation with barrier panel  6 . In this position, each top edge  38  of each longitudinal baffle-panel  10  is fixedly fastened to the inner surface of top panel  4 . The edges of top perimeter band  14  are then sealingly fastened to peripheral edge  22  of top panel  4  and peripheral edge  29  of barrier panel  6 , respectively, and the edges of bottom perimeter band  16  are then sealingly fastened to peripheral edge  29  of barrier panel  6  and peripheral edge  30  of bottom panel  8  so as to complete assembly of partially deflatable, multichambered transfer mattress  2 . 
         [0040]    Advantageously, first plenum  46  and second plenum  50  are in air flow communication with one another via conduit  51 , isolated from central plenum  48 , and each of first plenum  46 , central plenum  48 , and second plenum  50  are isolated from lower plenum  60 . In this way, first plenum  46 , central plenum  48 , and second plenum  50  may be fully inflated, i.e., pressurized above ambient pressure, while lower plenum  60  is deflated, i.e., at or below ambient pressure ( FIGS. 5 and 6 ). This configuration being suitable for a patient  75  to lie upon while at a stationary location, i.e., a hospital bed, operating table, or support platform of a diagnostic instrument  76  ( FIGS. 9 and 10 ). Advantageously, first plenum  46  and second plenum  50  may be deflated along with lower plenum  60 , while central plenum  48  remains inflated and capable of comfortably supporting a patient upon a mobile transport  77  of the type that include side rails  80  ( FIGS. 7-8  and  11 - 14 ). Side rails  80  on conventional mobile transports  77  are located on each longitudinal side of mobile transport  77  in spaced apart relation to one another, and constructed so as to be movable from between a first fully retracted position ( FIGS. 9-12 ) and a second fully extended position ( FIGS. 13-14 ). 
         [0041]    Patient  75  may be moved from a bed  76  or the like by first being positioned upon top surface  20  of multichambered transfer mattress  2 . Pressurized air is then pumped into first plenum  46 , central plenum  48 , second plenum  50 , via inlet/outlet openings  70   a,   70   b,   70   c  using air supply hose  34 . It will be understood that inlet/outlet openings  70   a,   70   b,   70   c  are closable so as to prevent deflation to occur unintentionally. Also, the sequence of inflation or deflation may be altered as needed or desired by the user. Once in this position, pressurized air is then pumped into lower plenum  60 , via inlet opening  65  using air supply hose  34 , so as to pressurize lower plenum  60  with pressurized air. When the pressurized air escapes through perforations  32  it creates an air bearing under multichambered transfer mattress  2  ( FIG. 10 ). Multichambered transfer mattress  2  may then be slid from its position on bed  76  to the top surface of mobile transport  77  ( FIG. 11 ). In order to allow for this transfer, side rails  80  must be lowered to their first fully retracted position. However, when multichambered transfer mattress  2  is located on top of mobile transport  77 , its overall width is generally greater than the overall width of the mobile transport so that side rails  80  may not be moved back to their second fully extended position. In order to facilitate the movement of side rails  80  into proper position on either side of patient  75 , first plenum  46  and second plenum  50  may be deflated by releasing either of inlet/outlet openings  70   a,   70   c.  In this way, air escapes from first plenum  46  and second plenum  50 , while pressurized air remains in central plenum  48  due to its isolated configuration. Once first plenum  46  and second plenum  50  are deflated each of side rails  80  may be moved from its first fully retracted position to its second fully extended position, so that the patient may be transported safely upon the mobile transport. To remove multichambered transfer mattress  2  from mobile transport  77 , the foregoing process is simply reversed. 
         [0042]    It is to be understood that the present invention is by no means limited only to the particular constructions herein disclosed and shown in the drawings, but also comprises any modifications or equivalents within the scope of the claims.