US20090100605A1 - Inflatable cell, a method of manufacturing such a cell, and a support device including such a cell - Google Patents

Abstract

An inflatable cell that is inflatable with a fluid, such as air, comprises a flexible casing that is closed at its ends, the casing defining, between its walls, at least one inflatable chamber; and at least one fluid insertion means for inserting fluid into the chamber and at least one fluid removal means for removing fluid from said chamber, these insertion and removal means being bonded in substantially airtight manner to at least one end of the casing; and at least one link means for linking the cell to another identical cell, which link means are integral with or secured to the casing. A method of manufacturing such a cell and a support device of the mattress type that is manufactured on the basis of assembling together such cells are also disclosed.

Description

• The present application claims priority, under 35 U.S.C. §119(a), of French National Application No. 07 58411 which was filed Oct. 18, 2007 and which is hereby incorporated by reference herein.
BACKGROUND
• The present disclosure relates to support devices of the mattress type or of the cushion type for supporting the body of a person sitting or lying on the support device, and in particular to support devices of the therapeutic mattress type for supporting patients' bodies. The present disclosure relates more particularly to an inflatable cell and to a method of manufacturing such an inflatable cell, the cell and the method being specifically developed for making a support device having a structure made up, at least in part, of a plurality of inflatable cells that are suitable for being inflated with a fluid, and in particular inflated with air, that are, more particularly, in the form of sausage-shaped tubes, and that are disposed transversely relative to the longitudinal direction of the mattress, side-by-side, so as to form an inflatable support layer on which a person can be recumbent and be supported under desired comfort conditions.
• Support devices of this type are, in particular, used as mattresses for patient care because they make it possible, by means of a device for regulating the inflation/deflation of the cells, to distribute appropriately the interface pressures, i.e. the pressures exerted locally by each point of the body on the surface of the mattress, as a function of the morphology and of the position of the patient, and thus to avoid or to reduce the risks of decubitus ulcers or “bedsores” forming in the zones of the body that are at risk such as the zone of the sacrum and the zone of the heels, for example.
• A large number of devices of this type are known and described in various forms in the state of the art. However, those support devices having structures that are inflatable, at least in part, all suffer from the drawback of being very costly to manufacture, which limits their field of use to hospitals, and indeed sometimes to only certain departments of hospitals for admitting and treating patients having very reduced mobility and/or having high risks of developing bedsores.
• The cost of manufacturing such support devices is, in particular, related to manufacturing their structural elements, and in particular the inflatable cells, and also the systems for automatically inflating said cells, which systems require implementation of a large number of ducts and of valves for feeding and/or removing air so as to enable the cells to be inflated and then for their inflation pressures to be regulated.
• The high cost of such support devices having inflatable cells currently rules out the use of such support devices for the vast majority of patients receiving healthcare treatment at home because public and private health insurance schemes generally refuse to pay or to reimburse the costs inherent to purchasing and using such devices.
• And yet giving healthcare treatment at home is a form of healthcare treatment that is increasingly being encouraged by the very same public and private health insurance schemes because it makes it possible to reduce considerably the healthcare costs related to prolonged periods in a hospital or to repeated spells in a hospital, or even makes it possible to avoid having to admit to a hospital at all patients who can, by means of progress in medical techniques, henceforth be treated as outpatients.
• There thus exists a major technical problem consisting in designing and making a support device made up of inflatable cells whose cost is low enough to be borne by patients and/or covered by their healthcare cover systems so as to enable them to be treated at home.
• Such a problem requires, in particular, the cost of each of the component elements of support devices having inflatable cells to be reduced, in particular the cost of the cells themselves, and also requires the structures of such support devices to be simplified so as to facilitate assembly of them and thus so as to reduce the cost of manufacturing them.
• Another problem is to provide a support device made up of inflatable cells that improve the support of the mattress and the comfort of the patient, and that are suitable for being assembled together and, when necessary, replaced individually so as to form a support device of the mattress type.
SUMMARY
• The present disclosures provides a solution to these problems by providing, in a first aspect, an inflatable cell that is inflatable with a fluid, such as air, and that comprises: a flexible casing that is closed at its ends in its longitudinal direction, said casing defining, between its walls, at least one inflatable chamber that is substantially cylindrical in shape after inflation; and at least one fluid insertion means for inserting fluid into said chamber and at least one fluid removal means for removing fluid from said chamber, these insertion and removal means being bonded in airtight manner to at least one of said ends of the casing; and at least one link means for linking the cell to another identical cell, which means are integral with or secured to the casing.
• The inflatable cell disclosed herein provides an individual and independent inflation chamber that incorporates into its structure means for inserting and removing an inflation fluid, and that, in addition includes link means for linking to another identical cell, thereby making it possible, by assembling together a plurality of cells, to make an inflatable support mattress of size adaptable to demand, and in which each cell is inflatable individually and can, in the event of failure, be replaced rapidly and simply with another identical cell, without replacing the entire mattress.
• The cell disclosed herein also offers the feature of being made from a single casing that is bonded at its ends, thereby making it possible to make the cell in a single operation, at high rates, from a sheath or from a segment of tubular material, in particular by welding two opposite faces of the tubular wall of the sheath along lines that extend transversely relative to the axial longitudinal direction of said sheath so as to form the ends of the casing, thereby reducing the manufacturing cost considerably.
• More precisely, according to an aspect of the present disclosure, the tubular casing may be constituted by a segment of tube or sheath made of an extruded thermoplastic material, which segment is closed at its ends by respective welds along respective lines that are optionally curved lines and that extend substantially transversely relative to the axial longitudinal direction of the sheath at said closed ends.
• Thus, in some embodiments, the tubular casing is constituted by a segment of tube or sheath made of an extruded thermoplastic material, which segment is closed at its ends by welding, such as by heat-sealing or high-frequency welding, the tubular wall of said sheath to itself, the opposite faces of said tubular wall of said casing being welded transversely to one another at said closed end, i.e. substantially in the direction that is transverse to the longitudinal direction of said cell, so as to form or define ends optionally having a curved transverse profile.
• The term “transversely” or “transverse direction” is used herein to mean a direction perpendicular to said axial longitudinal direction of said sheath and of the cells, corresponding to a diametrical direction when the sheath has a circular cross-section and corresponding more particularly to a vertical direction when said cells are assembled together side-by-side horizontally to form a mattress.
• More particularly, the opposite faces of said tubular casing are welded to each other transversely in end zones beyond said closed ends of said casing.
• More particularly, said fluid insertion means and said fluid removal means are constituted by tubular end-pieces welded at the weld of at least one of said closed ends of the casing, said end-pieces communicating with said inflatable chamber, said tubular end-pieces being interposed between the opposite faces of said tubular wall that are welded together transversely at said closed end.
• According to other aspects of an inflation cell of the present disclosure: said link means are formed integrally with the tubular casing of the cell, in one of said welded end zones of the cell, such as in the form of a tongue extending beyond said closed end of the casing; and said link means are provided with or co-operate with reversible fastener means suitable for co-operating with identical link means or with identical reversible fastener means and/or with complementary reversible fastener means of another identical inflatable cell so as to make it possible to establish a reversible link between the cell and said other identical cell, and in some instances to establish reversible links between the cell and two other identical cells.
• According to the present disclosure, the opposite faces of the tubular casing are bonded together by a longitudinal weld extending between said closed ends of the casing over a fraction of its length only, thereby separating said inflatable chamber into two inflatable compartments, namely an upper compartment and a lower compartment in the form of sausage-shaped tubes that are superposed and that communicate with each other at their ends.
• This embodiment is particularly interesting because it makes it possible to provide cells that present depth or height in said vertical transverse direction that is larger than their width (dimension in the longitudinal direction of the mattress), thereby imparting greater rigidity to said cells, and thus greater stability, giving them strength for withstanding crushing and deformation under the effect of the weight of the patient on the mattress.
• In some embodiments, two diametrically opposite faces of the tubular wall of the tubular casing are welded together longitudinally between said closed ends of the casing, substantially half-way up said casing, thereby separating said inflatable chamber into two inflatable compartments, namely an upper compartment and a lower compartment in the form of sausage-shaped tubes that are superposed and that are of substantially the same height.
• This feature is desirable in some embodiments because it enables the cells to keep a width that is substantially constant over their entire length, and thus it is possible to implement a mattress made up of an assembly of individualized cells, connected together reversibly by reversible link means at their ends only, further contributing to improving the support offered by the mattress and the comfort of the patient.
• When the cells of a mattress are secured to one another over their entire longitudinal sides, as is conventional, any variation in the volume of one cell, caused by pressure being applied to the cell, is passed on to the adjacent cells that are secured to it. Conversely, individualized cells of some embodiments contemplated herein deform independently from one another so that the zone made up of individualized cells matches more closely the shapes of the patient on it. However, it is desirable that said individualized cells have greater stability widthwise, regardless of their levels of inflation. That is why, in accordance with some embodiments of the present disclosure, the opposite longitudinal side faces of the tubular wall of each cell are tied together by tie means consisting of a longitudinal weld zone or line over a portion only of their length, thereby defining two superposed compartments that communicate with each other at their ends.
• More particularly, the cell has at least two link means, each provided with reversible fastener means suitable for co-operating with identical reversible fastener means of another identical inflatable cell so as to make it possible to establish a reversible link between the cell and at least one said other identical cell, and in some instances to establish reversible links between the cell and at least two other identical cells.
• Even more particularly, the two fluid insertion and fluid removal means are formed by tubular end-pieces that are typically rigid or semi-rigid, in a manner such that each of them opens out into said chamber at a different one of said upper and lower compartments.
• In the present disclosure, the term “semi-rigid” is used to mean that said tubular end-pieces hold their shapes while also being suitable for being curved, in particular for being provided with bends, without kinking.
• Even more particularly, facing each of said upper and lower compartments, the cell has: a fluid insertion means or a fluid removal means formed by a tubular end-piece bonded to the same end of the casing; and a link means formed at the end opposite from said fluid insertion means and from said fluid removal means.
• In accordance with other features of an inflatable cell of the present disclosure, the casing is made of ethylene vinyl acetate (EVA) or of polyurethane (PUR), more particularly of thickness lying in the range 150 micrometers (μm) to 350 μm.
• In another aspect of the present disclosure, a method of manufacturing such an inflatable cell is provided, comprising: a) selecting a segment of a tube or of a sheath made of a thermoplastic material and of determined length; and b) transversely welding together, such as by heat-sealing, the opposite faces of said segment of tube or of sheath so as to form said closed ends of the casing, and longitudinally welding together the opposite faces of the tubular wall of the casing of the cell substantially in a longitudinal zone or along a longitudinal straight line of said casing over a fraction only of the length of said cell so as to subdivide the inflatable chamber into two inflatable compartments that are superposed and that communicate at their ends; c) then cutting out the segment of tube or of sheath in the welded zones, beyond the boundaries of the transverse welds forming the closed ends of said casing defining said chamber, so as to obtain said inflatable cell.
• The term “transversely” is used herein to mean a direction that is transverse relative to the axial longitudinal direction of said sheath, as defined above.
• More particularly, in step b), said ends of said segment of tube or of sheath are transversely welded in a manner such as to form, in a single operation, the tubular casing that is closed at its two ends with said fluid insertion and removal means of the cell being assembled in airtight manner to one of said ends of the segment of tube or of sheath simultaneously with the welding, by interposing tubular end-pieces suitable for forming respectively at least one said fluid insertion means and at least one said fluid removal means between the opposite faces of the tubular wall of said portion of tube at at least one end before welding the ends of the casing over said tubular end-pieces.
• Yet more particularly, in step b), the opposite faces of said tubular casing that are transversely welded together are welded together in end zones beyond the curved transverse weld lines forming said closed ends of said chamber; and in step c), the segment of tube or of sheath is cut out in the welded end zones in a manner such as to form said link means of the cell.
• Yet more particularly, said link means are formed by cutting out a tongue, and forming perforations in said welded end zone.
• Yet more particularly, the diametrically opposite faces of the tubular wall of the casing of the cell are welded together between its closed ends, substantially half-way up its height so as to subdivide the inflatable chamber into two inflatable compartments, namely an upper inflatable compartment and a lower inflatable compartment, which compartments are superposed and of substantially the same height.
• The method disclosed herein makes it possible to make inflatable cells from a very long roll of a sheath or of a tube made of an extruded thermoplastic material, and thus to manufacture the inflatable cells on a mass-produced basis with a single operator, who merely has to position the fluid insertion and removal means at one end of the sheath or tube made of a plastics material before its walls are welded together locally so as, simultaneously, to form the casing of the cell, to weld said fluid insertion and removal means of the cell, and to form the attach or link means for attaching or linking the casing of the inflatable cell.
• The method disclosed herein thus makes it possible to obtain very considerable productivity gains when manufacturing individual inflatable cells for support devices of the mattress type, and thus a very considerable reduction in production and labor costs for such manufacturing.
• Finally, in another aspect, the present disclosure contemplates a support device for supporting an element to be supported, in particular a mattress or a cushion for supporting a patient's body, said support device being made up of at least two individualized inflatable cells as discussed above, assembled together by means of a said link means.
• More particularly, the support device is made up of a plurality p of individualized inflatable cells disposed side-by-side, one after the other, in the longitudinal direction of the mattress, and extending in a direction transverse to the longitudinal direction of the mattresses, where p is an integer lying in therange 2 to n, p and n being integers, the individualized inflatable cells being secured to one another by means of the respective link means being secured together, and communicating fluidly, such as pneumatically, with one another via fluid or pneumatic connection means comprising pipes or tubular fittings suitable for conveying and for transferring, as applicable, the inflation fluid between said fluid insertion means of some cells and said fluid removal means of other cells, to which means the pipes or tubular fittings are connected.
• The phrase “individualized inflatable cells” is used herein to mean cells that are made singly and independently, and that are connected one to another, optionally reversibly; in particular by said link means and optionally by pipes enabling fluid, in particular air, to flow between the various cells and connected to a device for feeding air to and for regulating the inflation pressures of the cells. Thus, said individualized cells can be replaced singly. In addition, since said individualized cells are not secured to one another over their entire length, they have and impart greater freedom of movement in order to match more closely the curves and shapes of the patient.
• When the consecutive cells disposed transversely relative to the longitudinal direction of the mattress are secured to one another along their entire longitudinal sides, as is conventional, any variation in the volume of one cell, caused by pressure being applied to the cell, is passed on to the adjacent cells that are secured to it. Conversely, individualized cells connected together at their ends only, in accordance with some embodiments disclosed herein, deform independently from one another so that the zone made up of individualized cells matches more closely the shapes of the patient on it. But, since they are made in individualized manner, some of the cells contemplated herein have greater stability widthwise, regardless of their levels of inflation, compared with juxtaposed cells that are welded together over their entire length.
• That is why, in accordance with some embodiments of the present disclosure, the opposite side faces of each cell are connected together by tie means constituted by a longitudinal weld extending over a portion of the length of said cells, and not reaching their ends, said weld optionally being situated substantially in the middle relative to the height of the cell, giving the cells a width that is substantially constant regardless of their level of inflation.
• More particularly, in accordance with some embodiments contemplated by the present disclosure, in at least one support zone, such as a substantially central zone designed to support the sacrum zone of a said person's body, and, in some instances a zone at which a sensor is situated, said support device is made up of a plurality of inflatable elements that are of a width smaller than their height, the width of said individualized inflatable elements of said central support zone also, even more particularly, being smaller than the width of the non-individualized inflatable elements of an end zone adjacent to said central support zone.
• At least in its central support zone, the support device of such embodiments presents a greater density of cells so that there is reduced risk of the patient sinking through the cells, in particular in the event of deflation when the cells are inflated in an alternating-pressure mode.
• The feature of the cells being individualized taken in combination with their width being stabilized and optionally smaller in said zone contributes to improving the support imparted by this zone and the comfort of the patient. This makes it possible to increase the number of support points procured by the inflatable elements and to enhance their distribution in said support zone when a person's body is on the upper layer of the device.
• Even more particularly, over at least one zone of the mattress, said consecutive cells are disposed in opposite directions with their air insertion and air removal means being disposed on opposite sides in the transverse direction of the mattress, so that said zone of the mattress comprises two first and second series of cells, each of said first and second series of cells being made up of cells having their fluid insertion and removal means on the same side in the transverse direction of the mattress and communicating fluidly, such as pneumatically, with one another continuously, said removal means of one cell being connected to a said insertion means of the next cell of the same series, namely the first or the second series, the first and second series of cells being connected in parallel and fed by the same inflation device, both of said series of cells comprising the same number of cells, with the cells being disposed in alternation from one series to the other in the longitudinal direction of the mattress in said zone, a cell from said first or second series being preceded and/or followed by a cell from said second or first series respectively.
• According to some embodiments contemplated by this disclosure, in said zone of the mattress, said consecutive cells have their link means disposed at an end opposite from the end at which said fluid insertion and removal means are disposed, so that each cell of each of said first and second series of cells made up of cells having their link means on the same side in the transverse direction of the mattress is linked by said link means to the following cell in the same series, and also in some embodiments where applicable, to the adjacent cell of the other series.
• This embodiment is more particularly useful, in particular when said and first and second series are inflated in the alternating mode, because it makes it possible to reduce the space occupied by the fluid connection pipes between the various cells disposed along the mattress, on either side of the mattress.
• According to other features, a support device in accordance with the present disclosure further comprises:
• an inflation device co-operating with at least one fluid feed duct connected to a said fluid insertion means of at least one said cell; and/or
• at least one fluid removal duct connected to a said fluid removal means of at least one other said cell; and/or
• at least one solenoid valve making it possible to control fluid feed and/or fluid removal for said cells; and/or
• the support device is provided with an electronic control and regulation device making it possible to control at least two said solenoid valves and said inflation device so as to cause inflation and/or deflation to take place, such as in an alternating manner, for the two first and second series of cells in at least one said zone of the mattress; and/or
• the support device is also provided with a device of the manual valve type for deflating at least some of said inflatable cells in an emergency, said device of the manual valve type comprising:
• a fastener first piece provided with a plurality of rigid first end-pieces perforated with through cylindrical orifices, said rigid first end-pieces co-operating with said removal means of said cells, such as for example, said perforated rigid first end-pieces being inserted into said tubular end-pieces forming said removal means, or said perforated rigid first end-pieces being inserted into the ends of fluidic or in some instances pneumatic transfer pipes communicating at their other ends with said removal means of a plurality of said cells, so as to enable at least one zone of cells of said mattress to be deflated; and a removable second piece including second end-pieces suitable for being fitted in said first orifices of said perforated rigid first end-pieces so as to form removable stoppers closing off said first orifices, and a handle suitable for being pulled manually so as to extract said second end-pieces from said orifices in said first end-pieces, and so as to make it possible for said cells to be deflated rapidly for such emergency purposes;
• said second end-pieces of said removable piece are provided with second through cylindrical orifices closed off in substantially airtight manner by caps, said caps being suitable for co-operating with pressure measurement means, thereby making it possible for the pressures in said cells to be measured rapidly;
• each of said caps includes a portion made of an elastomer that is suitable for being perforated and passed through in substantially airtight manner by a hollow needle, said hollow needle co-operating with pressure measurement means, thereby making it possible for the pressures in said cells to be measured rapidly; and/or
• the support device is provided with controlled air distribution means comprising at least one semi-rigid duct, forming an air distribution network, provided with a substantially rectilinear duct provided with perforations or with branches forming a plurality of nozzles perforated at their ends and extending in a direction that is substantially perpendicular to the longitudinal direction of said rectilinear duct, said perforations or said nozzles being suitable for distributing streams of air under the patient, when said controlled air distribution means are disposed under said cells and is connected to a fluid feed device, said controlled air distribution device sometimes comprising at least one said duct on either side of the mattress and connected to the same feed device.
BRIEF DESCRIPTION OF THE DRAWINGS
• Other features and aspects appear from the following detailed description of an embodiment of the inflatable cell of the present disclosure and of a support device including such inflatable cells, given with reference to the accompanying drawings, in which:
• FIG. 1 shows an individual inflatable cell according to the present disclosure, seen face-on;
• FIG. 2 is a perspective view of a support device according to the present disclosure for supporting an element to be supported, which device comprises an inflatable mattress made up of an assembly of a plurality of individual inflatable cells that are as shown inFIG. 1;
• FIGS. 3A and 3B are views of a construction detail of the support device ofFIG. 2, showing the structure and the positioning of a Cardio-Pulmonary Resuscitation (CPR) rapid deflation valve for rapidly deflating the cells of the inflatable mattress of the support device;
• FIGS. 4A and 4B show an air distribution device that is typically of the Low Air Loss type and that is incorporated into the support device shown inFIG. 2, under the inflatable mattress of the support device; and
• FIGS. 5A and 5B diagrammatically show the hydraulic connection network for the inflatable cells of the mattress of the support device of the present disclosure in an illustrative embodiment.
DETAILED DESCRIPTION
• FIG. 1 shows an inflatable cell according to the present disclosure that is designated byoverall reference1. Thecell1 is inflatable by means of an inflation fluid such as a gas, such as air, that can be injected into the cell by any suitable means such as, for example, a turbine or a compressor.
• Theinflatable cell1 comprises firstly a flexibletubular casing2 that is illustratively elongate and closed at itsends3,4.
• The cell further comprises at least one fluid insertion means5 for inserting fluid into the cell and at least one fluid removal means6, these fluid insertion and removal means being bonded in substantially airtight manner to at least one of theends3,4 of thecasing2, and, for example, being constituted by two tube end-pieces made of a rigid or a semi-rigid plastics material, such as a co-extruded material based on EVA.
• Theinflatable cell1 finally further comprises at least one, and in some embodiments at least two, and in further embodiments at least four attach or link means7 for attaching or linking thecell1 to another identical cell.
• These attach or link means sometimes take the form of rectangular tongues that are integral with or secured to at least oneend3,4 of thecasing2 as shown inFIG. 1.
• Said attach or link means7 are possibly formed integrally with the remainder of thecasing2 of thecell1 while said cell is being manufactured, as described below.
• Thecasing2 of thecell1 is, in the illustrated embodiment, constituted by a segment of tube or of sheath made of a thermoplastic material, in particular EVA or PUR, welded over its entire height at the two ends3,4 of thecasing2, and defining, between its walls, aninflatable chamber8 that communicates with the outside of thecell1 via end-pieces5,6 for inserting inflation fluid into the cell and for removing inflation fluid therefrom.
• Typically, in order to provide that thecell1 has good strength for withstanding the various forces to which it might be subjected the thickness of the walls of thetubular casing2 lies in the range 150 μm to 350 μm.
• In addition, thetongues7 for linking thecell1 to other identical cells are provided with reversible fastener means (not shown inFIG. 1) of the press stud type, or the clip type, or of the Velcro® fastener type, and suitable for co-operating with identical or complementary reversible fastener means on alink tongue7 of another identicalinflatable cell1 so as to enable saididentical cells1 to be linked together reversibly.
• Theinflatable cell1 is also provided with a middle longitudinal weld between the two ends3,4 of thecasing2 and over at least a portion of the length thereof, thereby separating theinflatable chamber8 into two compartments, namely anupper compartment8aand alower compartment8bin the form of inflatable sausage-shaped tubes, superposed and communicating at theirends8cso that an inflation fluid with which thecell1 is filled can flow easily between the two sausage-shapedtubes8a,8bof the chamber.
• The middlelongitudinal weld9 makes it possible, starting from a tubular casing that has a substantially circular cross-section when it is inflated, to form two sausage-shapedtubes8a,8bof substantially identical diameter. The diameter of said sausage-shapedtubes8a,8bis substantially halved relative to the diameter of the initial tubular casing. The cell thus has a width (dimension in the longitudinal direction of the mattress) that is less than the height, depth, or thickness of the cell (dimension in the vertical direction of the mattress), thereby imparting improved rigidity to said cell. Starting from a tubular wall of substantially circular cross-section, it is thus possible to obtain a cell of width that is substantially half its height.
• Said middlelongitudinal weld9 reinforces the structure of thecell1 and, in particular, improves its strength and resistance to compression forces applied perpendicularly to the longitudinal midplane of thecell1. The crush and deformation strength of thecell1 is thus improved.
• Theinflatable cell1 can be manufactured using a method that is extremely simple, productive, and economical.
• In this method, firstly a segment of a tube or of a sheath made of a thermoplastic material such as EVA or PUR is selected, of a determined length that is slightly greater than the total length of theinflatable cell1 that is to be obtained, and having walls of thickness lying in the range 150 μm to 350 μm.
• The tube or sheath made of a plastics material used for making the cell can in particular be in the form of a roll or of a coil formed by rolling up the tube as flat after it has been extruded continuously, thereby making it easier to use for manufacturing inflatable cells of some embodiments, in particular automatically or semi-automatically.
• After a segment of tube of suitable length has been selected, the walls of said segment of tube are welded together in two mutually distant zones over the entire width of the tube or of the sheath so as to form, in a single operation, thetubular casing2, theends3,4 thereof, and thelink tongues7 for the cell in alignment with said ends, themeans5,6, for inserting fluid into thecell1 and for removing fluid therefrom being assembled in substantially airtight manner to one of said ends3,4, simultaneously with the welding.
• Once the welding has been performed, the segment of tube or sheath is cut off beyond its welded zones (in practice at theends3,4 of thecasing2 and of thelink tongues7 obtained after welding) in order to obtain aninflatable cell1.
• So that the means for inserting fluid into the cell and for removing fluid therefrom are welded to thecasing2 while said casing is being made, at least one end-piece oftube5 that is suitable for forming fluid insertion means and at least one end-piece oftube5 that is suitable for forming fluid removal means are positioned at a cut end of the segment of tube or of sheath that is made of a thermoplastic material and that is chosen for forming the casing of a said inflatable cell.
• The fluid insertion andremoval tubes5,6 can be positioned in this way manually by an operator or automatically.
• Optionally, the formed cell is cut out simultaneously with the welding of its ends. The cutting-out can, in particular, result either from the welding itself, or in some instances from a cutting member adjacent to the welding tools and actuated automatically either simultaneously with actuation of the welding tools or subsequently to actuation thereof so as to cut the cell out after welding from the sheath or tube made of a plastics material.
• The attach or link tongue(s)7 of thecell1 are formed by welding together the flanks of the segment of tubular wall or sheath made of thermoplastic material and from which thecasing2 is formed, in alignment and in continuity with theends3,4 of thechamber8, simultaneously to forming of said ends3,4, and then by cutting out said tongues from the weldedend zones31,41 that form said flanks that are welded together.
• Similarly, the walls of the segment of tube or of sheath made of a thermoplastic material are welded together along a longitudinalmiddle line9 of thecasing2 of the formed cell so as to subdivide theinflatable chamber8 defined by said walls into twoinflatable chambers8a,8bor inflatable sausage-shaped tubes that communicate with each other at their ends.
• The length and the diameter of the sausage-shapedtubes8a-8b,and thus the length and the width of thecells1 can be respectively in therange 60 centimeters (cm) to 100 cm for the length and in therange 7 cm to 16 cm for the width, in order to form respective mattresses of width lying in therange 60 cm to 100 cm and of length lying in the range 115 cm to 220 cm with sausage-shaped tubes disposed transversely relative to the longitudinal direction of the mattress.
• After thecell1 has been cut out, reversible fastener means, in particular of the press stud type or of the clip type, as mentioned above, are installed manually or automatically on the link tongue(s)7 of thecasing2 of thecell1.
• More particularly, inFIG. 2, said link means are constituted by saidtongue7 provided withperforations7aand co-operating withrivets7b,said rivets being suitable for co-operating in reversible fastening with perforations in another identical tongue or with perforations at the end of another cell, the two cells being disposed parallel to each other with their said link means at their ends on the same side.
• It can be understood that, in this example, saidperforations7aconstitute reversible fastener means and saidrivets7bconstitute complementary reversible fastener means, co-operating with said reversible fastener means7ato form a said reversible fastening.
• More precisely, rivets7bco-operate withperforations7ain thetongue7 of a cell and withperforations7aat the end of the next cell. Thus, rivets7bmake it possible to attach atongue7 of one cell throughperforations7ain two other following cells, theperforation7ain the second following cell being a perforation in the tongue of the link means7 of said second following cell, while the first following cell is not provided with any tongue on this side.
• The main but not exclusive purpose of theinflatable cell1 of the illustrative embodiment is to enable support devices of the therapeutic mattress type having inflatable cells to be manufactured at a low cost relative to the cost of manufacturing currently existing support devices of this type for supporting the bodies of patients presenting risks of bedsores forming or worsening both in hospital and at home.
• To this end, this disclosure proposes such a support device such as that shown in one embodiment inFIG. 2 or inFIG. 4B and designated byoverall reference10.
• Thissupport device10 illustratively comprises an upper layer for supporting a person's body, which layer is constituted by aninflatable mattress11 made up of a plurality ofinflatable cells1 identical to the cell described above and shown inFIG. 1 and rests on a lower layer for supporting theinflatable mattress1, which layer is, for example, constituted by afoam mattress12, in particular a polyurethane foam mattress, the density of the foam being chosen to stiffen thesupport device10 and to take up to a good extent the forces applied by the body of a person recumbent on thecells1 of theinflatable mattress11.
• Thesupport device10 further comprises anautomatic inflation system13 for automatically inflating themattress11, which system is placed in a rigid console orhousing14 resting on thefoam mattress12 in alignment with theinflatable mattress11.
• Theinflatable mattress11, thefoam mattress12, and theinflation system13 are optionally inserted into a removable protective cover that is not shown inFIG. 2.
• Theinflatable mattress11 is made up of a plurality ofinflatable cells1 in the illustrative example, and sometimes in the range of 3 identical inflatable cells to 24 substantially identical inflatable cells, themattress11 shown inFIG. 2 or inFIG. 4B having 19 substantially identical inflatable cells.
• Thecells1 are assembled together at theirends3,4 via theirlink tongues7 provided with complementary reversible fastener means, in particular press studs, or indeed plastic rivets.
• Thecells1 are thus pressed and held against one another over their side faces such that their respectivelongitudinal welds9 separating theirinflation chambers8 into superposedcompartments8a,8blie substantially in the same horizontal plane that forms a longitudinal midplane for theinflatable mattress11, when no patient is on the mattress.
• Theinflatable cells1 of themattress11 of the support device also communicate with one another at their fluid insertion and removal means5,6 and with theinflation device14 via pneumatic connection means such as ducts and valves establishing communication between theinflation chambers8 of all of thecells1 and suitable for conveying inflation fluid (air, in practice) and, where applicable, for transferring it between theinflation cells1.
• The connection means form a pneumatic circuit that comprises, in particular, at least one fluid feed pipe connected to the fluid insertion means5 of thecells1 and at least one fluid removal duct connected to the fluid removal means6 of thecells1. The connection means further comprise at least one solenoid valve making it possible to control the fluid feed and/or fluid discharge for thecells1 in order to regulate the inflation pressure thereof.
• More practically, the pneumatic communications between thevarious cells1 and theinflation device14 are optionally established in the manner described below and shown inFIGS. 5A and 5B for aninflatable mattress11 having twentycells1.
• FIGS. 5A and 5B show atherapeutic mattress11 equipped with aninflation device14 as contemplated by this disclosure.
• Thetherapeutic mattress11 is made up of 19 inflatable cells that are disposed transversely to the longitudinal direction of the mattress. Each cell is made up of two compartments, namely an upper compartment and a lower compartment, said upper and lower compartments being in the form of sausage-shaped tubes and communicating with each other at their ends.
• Themattress11 shown inFIGS. 5A and 5B comprises the following three zones: afoot zone11P made up of the first three cells (cells Nos.1 to3); acentral zone11C made up of eight cells (cells Nos.4 to11); and ahead zone11T also made up of eight cells (cells Nos.12 to19).
• Thecentral zone11C corresponds to a zone inflated using an alternating inflation method as described herein.
• Thecentral zone11C comprises a first series of cells or “first cells”11C1 (cells Nos.5,7,9 and11) and a second series of cells or “second cells”11C2 (cells Nos.4,6,8 and10).
• The cells of each of said first and second series11C1 and11C2 are connected in series, i.e. in line, the two series being connected in parallel, fed by thesame inflation device14.
• More precisely, each of the cells of themattress11 is provided with an inlet orifice and with an outlet orifice (not shown). The inlet or feed orifice is situated at one end of the upper compartment, in the transverse direction of the mattress, the outlet or removal orifice being situated at the same-side end of the lower compartment, in the transverse direction of the mattress (or in the longitudinal direction of the cell). Two adjacent cells have their orifices disposed at opposite ends in the transverse direction of the mattress and they belong to different series of cells.
• Thus, inFIG. 5A, it can be seen that cell No.1 at the foot of the mattress is fed via apipe33 at theend5 of the upper compartment of cell No.1, and theend6 of the same side of the lower compartment of cell No.1 communicates directly with the end of the lower compartment on the same side of cell No.3, whose same-side end of the upper compartment communicates, starting from a T-branch fitting33a,firstly with a first solenoid valve34₁, starting from which cells Nos.5,7,9, and11 of said first series11C1 of cells are disposed in series, and secondly, connected in parallel with the cells11C1, with the same-side end of the upper compartment of cell No.13, which is the second cell of thehead zone11T starting from the foot of the bed, the other cells of the head zone Nos.15,17, and19 being connected one after another in series.
• Symmetrically, inFIG. 5B, it is shown that cell No.2 of thefoot zone11P is fed, at the opposite end of the upper compartment, from thedevice14, via thesame pipe33. And the same-side end of the lower compartment of cell No.2 of thefoot zone11P feeds a T-branch fitting33a,from which the following are fed in parallel: firstly the second solenoid valve34₂, from which cell No.4 of the mattress, representing the first cell of said second series of cells11C2, is fed, the other cells of the second series of cells11C2, namely cells Nos.6,8, and10, being fed in series, i.e. communicating with one another in series symmetrically and parallel to said first series of cells11C1; and secondly apipe33 that feeds the end of the upper compartment of the first cell No.12 of the head zone, the same-side end of the lower compartment of the following second cell of the head zone, namely cell No.14 starting from the foot of the bed, being fed from the same-side end of the lower compartment of cell No.12, and so on, in series on to cell No.16 and then on to the penultimate cell No.18 of thehead zone11T.
• It can thus be seen that the cells of thehead zone11T and of thefoot zone11P constitute third cells that are situated upstream of the first and second solenoid valves34₁and34₂.
• The solenoid valves34₁and34₂are shown disposed in line between thepipes33 and the orifices of the first cells of said first series11C1 and of said second series of cells11C2. However, they could be disposed in specific housings.
• Said first and second solenoid valves34₁and34₂are 3-port solenoid valves of the 3/2 type, as described above.
• This organization of the various cells of the mattress in two series of cells11C1 and11C2 that are connected in parallel but that are disposed such that the cells of said first series11C1 and of said second series11C2 succeed one another in alternation, and with the two series being controlled by different solenoid valves, makes it possible to facilitate implementation of the alternating inflation method described herein, while minimizing the space occupied around the mattress by the network of pipes and other means for establishing hydraulic communication between the cells.
• In order to control and to achieve the inflation/deflation of thecells1 of the support device, the inflation device in thehousing14 comprises, in conventional manner, at least one air compressor and means for measuring the inflation pressures in the cells that are electrically connected to an electronic control andregulation device13 that is received, like the remainder of the inflation device, in particular the compressor, in a block of foam at the foot of thesupport device10 in alignment with themattress11.
• The electronic control andregulation device13 makes it possible to control both the air compressor and the solenoid valves of the pneumatic circuit for inflating the support device so as to inflate/deflate thecells1 as a function of the air pressures in the cells and also of the pressures applied by the body of a person recumbent on theinflatable mattress11.
• Such pressures applied by the body of a person recumbent on themattress11 are measured by means of at least onesensor29, such as the sensor described, for example, in the Applicant's European Patent EP 0 676 158, disposed between theinflatable mattress11 and thefoam mattress12 or under thefoam mattress12 and also connected to the electronic control device, which, by comparing the air pressures measured in the cells with the pressures applied to the cells by the body of a person operates the compressor and the solenoid valves so as to adjust the inflation pressure of thecells1.
• In known manner, the electronic control device of theautomatic inflation system13 can be configured to implement and maintain an “alternating-pressure” inflation mode forcertain cells1 of theinflatable mattress11 of thesupport device10, and, in particular, for thecells1 serving to support the sacral zone of a patient, which cells are generally thecells1 of the central zone of themattress11.
• In such an “alternating-pressure” inflation mode, for example, one in every two cells of the sacral support zone for supporting the sacral zone of the patient are deflated and then re-inflated, and then the cells adjacent to the preceding cells that have been deflated and then re-inflated are in turn deflated and then re-inflated.
• Thus, eachcell1 of themattress11 in the alternating-pressure regulated support zone of themattress11 is successively and progressively deflated and then re-inflated, generating a kind of wave moving back and forth in the longitudinal direction of themattress11 and massaging the patient, thereby facilitating blood circulation through the soft tissue of the body at the interface with the mattress while the cells are being re-inflated, or minimizing the effects of ischemia, in particular anoxia or hypoxia, while the compartments are being deflated.
• As shown in detail inFIGS. 3A to 3B, thesupport device10 also comprises a manual emergency deflation valve15 for deflating at least some of theinflatable cells1 of themattress11. Such an emergency deflation valve is generally known as a “CPR” (Cardio-Pulmonary Resuscitation) valve;
• Such a CPR valve makes it possible, when it is actuated, to deflate simultaneously and very rapidly the cells supporting the torso of a patient recumbent on the mattress so that the patient can be given a heart massage on a rigid surface rather than on the inflatable cells of the support device.
• The manual CPR valve15 includes a fastener first piece15₁that is essentially made up of first perforated end-pieces17₁. These first end-pieces17₁are perforated with through cylindrical orifices19₁.
• InFIGS. 3A and 3B, said fastener piece15₁has four said rigid first end-pieces17₁. Said first end-pieces17₁are designed to be inserted into removal orifices of said cells and/or into the ends of small hydraulic transfer pipes or hoses communicating at their other ends with said removal orifices of said cells. Said fastener first piece15₁illustratively has a base or asupport plate18 enabling it to be fastened to the mattress. The base orplate18 is slid under thefoam mattress12 and co-operates in clamping with a backing plate (not shown) positioned above thefoam mattress12 and enabling it to be fastened securely around thefoam mattress12, on which theinflatable mattress1 rests, thefoam mattress12 being clamped between theplate18 and the backing plate (not shown).
• The manual CPR valve15 also includes a second piece15₂, or removable piece15₂, having second end-pieces17₂suitable for stopping said first cylindrical orifices19₁of the first end-pieces17₁, and ahandle22 suitable for making it possible to pull said removable piece15₂so as to extract said second end-pieces17₂from said first orifices19₁, so as to enable thecells1 of the mattress communicating with said first end pieces17₁to be deflated in accelerated manner.
• By being fastened securely, said fastener piece15₁makes it possible to facilitate actuation of thehandle22 for releasing the piece15₂from the piece15₁. The removable piece15₂is made of a more flexible plastics material, in particular of a styrene-ethylene-butadiene-styrene (SEBS) elastomer or of an ethylene-propylene-diene-monomer (EPDM) elastomer, while the fastener piece15₁is made of a more rigid material, in particular of acrylonitrile-butadiene-styrene (ABS) or of polycarbonate (PC). The removable piece15₂is fastened to the fastener piece15₁, by adapting and fastening the portion16₂of the piece15₂against the portion16₁of the piece15₁, via rivets co-operating with theorifices23₁of the pieces15₁andorifices23₂of the piece15₂, theorifices23₁and23₂being put into correspondence, so that, by pulling on thehandle22, it is possible to disengage the second end-pieces17₂from the first orifices19₁.
• InFIG. 3B, the moving piece15₂includes three second end-pieces17₂each of which is also perforated with a respective second cylindrical orifice19₂through said end-piece and receiving aremovable cap20 suitable for closing off said second end-pieces19₂in substantially airtight manner.
• InFIG. 3B, each of theremovable caps20 has aninner end21 inside a corresponding one of said second cylindrical orifices19₂. Since saidend21 is made of a fluorocarbon-containing perforatable material, a hollow needle connected to a pressure measurement device can pass through it, so that it is possible rapidly to measure the pressures in the cells communicating with said end-pieces17₁. In a variant, it is possible to replace thecaps20 with ball valves of the type used for inflating footballs, inserted into said second end-pieces17₂of the removable piece15₂, so as to enable an accessory system to be connected rapidly for measuring and/or inflatingcells1 of amattress11.
• After removing the moving piece15₂from the fastener piece15₁or after removing thecaps20, it is possible to re-inflate the mattress rapidly by means of an accessory fluid injection device connected in said first orifices19₁.
• It can be understood that said fastener first piece15₁constitutes an interface piece between said removable piece15₂, carrying stoppers and orifices communicating with the cells. By means of said fastener first piece15₁being held securely relative to the mattress, it is quick and easy for all of the orifices closed off by said removable piece15₂to be opened suddenly and rapidly.
• InFIGS. 3A and 3B, the manual valve device15 has four said first end-pieces17₁suitable for co-operating with four portions of hydraulic connection pipe. In a first embodiment, the four hydraulic connection pipes are connected to cells Nos.9,10,11, and12, in particular with a closed-off tubular removal/feed end-piece6₁of cell No.9 and a closed-off removal/feed end-piece6₂of cell No.10 on the opposite side. The manual valve15 can also communicate with removal/feed end-pieces disposed on the opposite sides of cells Nos.11 and12 of thezone11C, or with the unused closed-off feed/removal end-pieces6₀,6₃, and6₄of cells Nos.1,19, and18.
• As shown inFIG. 4, thesupport device10 of the illustrative embodiment is also provided with a controlledair distribution device22 for distributing air in controlled manner between the cells, and generally known as a “Low Air Loss” device.
• The controlledair distribution device22 is designed to convey and to distribute the volume of air generated by the air compressor with a view to providing air circulation inside the patient support device in order to limit the development of dampness both in said support device and at the interface with the patient through the removable protective cover.
• In another embodiment, the device is limited to a vulnerable zone to be treated (in particular the sacral zone, for example).
• This controlled air distribution device comprises in particular one, and in some embodiments, as shown inFIG. 4, at least twosemi-rigid ducts23 disposed under theinflatable cells1 of themattress11 and on thefoam mattress12 and connected to the air compressor of theinflation system13. Theducts23 are provided withnozzles24 projecting from their surfaces, saidnozzles24 being perforated at their pointed ends in a manner such as to distribute steams of air under theinflatable cells1 of themattress1 of the support device. In a variant, thenozzles24 can be replaced with holes in a pipe forming theduct23 that is provided with holes at a defined pitch.
• The air diffusion flow-rate through thenozzles24 is determined primarily by the aperture diameter of saidnozzles24 that can lie in therange 1 millimeter (mm) to 3 mm as a function of the flow-rate of the air compressor used.
• Theducts33 are optionally disposed parallel to each other along the longitudinal edges of thefoam mattress12 of the support device with theirnozzles24 facing one another. They are also optionally provided withfastener tabs25 via which they can be fastened, such as removably, to thefoam mattress12 by suitable fastener means and/or to the ends of said cells.
• Theducts23 are, in addition, connected together via apipe26 that makes it possible for pneumatic communication to be established between the twopipes22, asecond pipe27, also secured to one of the twoducts23, making it possible to connect the controlled air distribution device to the compressor of theinflation system13 of thesupport device10 of the disclosed embodiment.

Claims (20)

1. An inflatable cell that is inflatable with a fluid such as air and that comprises:

a flexible casing that is closed at its ends in the longitudinal direction, said casing defining, between its walls, at least one inflatable chamber that is substantially cylindrical in shape after inflation; and

at least one fluid insertion means for inserting fluid into said chamber and at least one fluid removal means for removing fluid from said chamber, these insertion and removal means being bonded in substantially airtight manner to at least one of said ends of the casing; and

at least one link means for linking the cell to another identical cell, which means are integral with or secured to the casing;

wherein:

1) the tubular casing is constituted by a segment of tube or sheath made of an extruded thermoplastic material, which segment is closed at its ends by respective welds along respective lines that are curved lines and that extend substantially transversely relative to the axial longitudinal direction of the sheath at said closed ends; and

2) the opposite faces of the tubular casing are bonded together by a longitudinal weld extending between said closed ends of the casing over a fraction of its length only, thereby separating said inflatable chamber into two inflatable compartments, namely an upper compartment and a lower compartment in the form of sausage-shaped tubes that are superposed and that communicate with each other at their ends.

2. An inflatable cell according toclaim 1, wherein the opposite faces of said tubular casing are welded to each other transversely in end zones beyond said closed ends of said casing.

3. An inflatable cell according toclaim 2, wherein said fluid insertion means and said fluid removal means are constituted by tubular end-pieces welded at the weld of at least one of said closed ends of the casing, said end-pieces communicating with said inflatable chamber, said tubular end-pieces being interposed between the opposite faces of said tubular wall that are welded together transversely at a said closed end.

4. An inflatable cell according toclaim 1, wherein said link means are formed integrally with the tubular casing of the cell, in one of said welded end zones of the cell, in the form of a tongue extending beyond said closed end of the casing.

5. An inflatable cell according toclaim 1, wherein said link means are provided with or co-operate with reversible fastener means suitable for co-operating with identical link means or with identical reversible fastener means and/or with complementary reversible fastener means of another identical inflatable cell so as to make it possible to establish a reversible link between the cell and said other identical cell, and to establish reversible links between the cell and two other cells.

6. An inflatable cell according toclaim 4, wherein said link means are provided with or co-operate with reversible fastener means suitable for co-operating with identical link means or with identical reversible fastener means and/or with complementary reversible fastener means of another identical inflatable cell so as to make it possible to establish a reversible link between the cell and said other identical cell, and to establish reversible links between the cell and two other cells, and wherein said link means are constituted by a said tongue provided with perforations and co-operating with rivets, said rivets being suitable for co-operating in reversible fastening with perforations of another cell, the two cells being disposed parallel to each other, with their said link means at their ends on the same side.

7. An inflatable cell according toclaim 1, wherein two diametrically opposite faces of the tubular wall of the tubular casing are welded together longitudinally between said closed ends of the casing, substantially half-way up said casing, thereby separating said inflatable chamber into two inflatable compartments, namely an upper compartment and a lower compartment in the form of sausage-shaped tubes that are superposed and that are of substantially the same height.

8. An inflatable cell according toclaim 1, having at least two link means, each provided with reversible fastener means suitable for co-operating with identical reversible fastener means of another identical inflatable cell so as to make it possible to establish a reversible link between the cell and at least one said other identical cell, and to establish reversible links between the cell and at least two other identical cells.

9. An inflatable cell according toclaim 1, wherein, facing each of said upper and lower compartments, it has:

said fluid insertion means or said fluid removal means formed by a tubular end-piece bonded to the same end of the casing; and

said link means formed at the end opposite from said fluid insertion means and from said fluid removal means.

10. A method of manufacturing an inflatable cell according toclaim 1, comprising the steps of:

a) selecting said segment of a tube or of a sheath made of a thermoplastic material and of determined length; and

b) transversely welding together, by heat-sealing, the opposite faces of said segment of tube or of sheath so as to form said closed ends of the casing, and longitudinally welding together the opposite faces of the tubular wall of the casing of the cell substantially in a longitudinal zone or along a longitudinal straight line of said casing over a fraction only of the length of said cell so as to subdivide the inflatable chamber into two inflatable compartments that are superposed and that communicate at their ends; then

c) cutting out the segment of tube or of sheath in the welded zones, beyond the boundaries of the transverse welds forming the closed ends of said casing defining said chamber, so as to obtain a said inflatable cell.

11. A method according toclaim 10, wherein, in step b), said ends of said segment of tube or of sheath are transversely welded in a manner such as to form, in a single operation, the tubular casing that is closed at its two ends with said fluid insertion and removal means of the cell being assembled in substantially airtight manner to one of said ends of the segment of tube or of sheath simultaneously with the welding, by interposing tubular end-pieces suitable for forming respectively at least one said fluid insertion means and at least one fluid removal means between the opposite faces of the tubular wall of said portion of tube at at least one said end before welding the ends of the casing over said tubular end-pieces.

12. A method according toclaim 10, wherein:

in step b), the opposite faces of said tubular casing that are transversely welded together are welded together in end zones beyond the curved transverse weld lines forming said closed ends of said chamber; and

in step c), the segment of tube or of sheath is cut out in the welded end zones in a manner such as to form said link means of the cell.

13. A method according toclaim 12, wherein said link means are formed by cutting out a said tongue, and said perforations are formed in said welded end zone.

14. A support device for supporting an element to be supported, in particular a mattress or a cushion for supporting a patient's body, said support device being made up of a plurality of individualized inflatable cells according toclaim 1, which cells are assembled together by means of said link means, are disposed side-by-side, one after the other, in the longitudinal direction of the mattress, and extend in a direction transverse to the longitudinal direction of the mattresses, the individualized inflatable cells being secured to one another by means of the respective link means being secured together, and communicating pneumatically with one another via pneumatic connection means comprising pipes or tubular fittings suitable for conveying and for transferring, as applicable, the inflation fluid between said fluid insertion means of some cells and said fluid removal means of other cells, to which means the pipes or tubular fittings are connected.

15. A device according toclaim 14, wherein, over at least one zone of the mattress, said consecutive cells are disposed in opposite directions with their air insertion and air removal means being disposed on opposite sides in the transverse direction of the mattress, so that said zone of the mattress comprises two first and second series of cells, each of said first and second series of cells being made up of cells having their fluid insertion and removal means on the same side in the transverse direction of the mattress and communicating pneumatically with one another continuously, said removal means of one cell being connected to a said insertion means of the next cell of the same series, namely the first or the second series, the first and second series of cells being connected in parallel and fed by the same inflation device, both of said series of cells comprising the same number of cells, with the cells being disposed in alternation from one series to the other in the longitudinal direction of the mattress in said zone, a cell from said first or second series being preceded and/or followed by a cell from said second or first series respectively.

16. A support device according toclaim 15, wherein, in said zone of the mattress, said consecutive cells have their link means disposed at an end opposite from the end at which said fluid insertion and removal means are disposed, so that each cell of each of said first and second series of cells made up of cells having their link means on the same side in the transverse direction of the mattress is linked by said link means to the following cell in the same series, and also to the adjacent cell of the other series.

17. A support device according toclaim 14, also provided with a device of the manual valve type for deflating at least some of said inflatable cells in an emergency, said device of the manual valve type comprising:

a fastener first piece provided with a plurality of rigid first end-pieces perforated with through cylindrical orifices, said rigid first end-pieces co-operating with said removal means of said cells, said perforated rigid first end-pieces being inserted into said tubular end-pieces forming said removal means, or said perforated rigid first end-pieces being inserted into the ends of pneumatic transfer pipes communicating at their other ends with said removal means of a plurality of said cells, so as to enable at least one zone of cells of said mattress to be deflated; and

a removable second piece including second end-pieces suitable for being fitted in said first orifices of said perforated rigid first end-pieces so as to form removable stoppers closing off said first orifices, and a handle suitable for being pulled manually so as to extract said second end-pieces from said orifices in said first end-pieces, and so as to make it possible for said cells to be deflated rapidly for such emergency purposes.

18. A device according toclaim 17, wherein said second end-pieces of said removable piece are provided with second through cylindrical orifices closed off in substantially airtight manner by caps, said caps being suitable for co-operating with pressure measurement means, thereby making it possible for the pressures in said cells to be measured rapidly.

19. A device according toclaim 18, wherein each of said caps includes a portion made of elastomer that is suitable for being perforated and passed through in substantially airtight manner by a hollow needle, said hollow needle co-operating with pressure measurement means, thereby making it possible for the pressures in said cells to be measured rapidly.

20. A device according toclaim 14, provided with controlled air distribution means comprising at least one semi-rigid duct, forming an air distribution network, provided with a substantially rectilinear duct provided with perforations or with branches forming a plurality of nozzles perforated at their ends and extending in a direction that is substantially perpendicular to the longitudinal direction of said rectilinear duct, said perforations or said nozzles being suitable for distributing streams of air under the patient, when said controlled air distribution means are disposed under said cells and is connected to a fluid feed device, said controlled air distribution device comprising at least one said duct on either side of the mattress and connected to the same feed device.

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