Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
  • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
  • A61G7/05—Parts, details or accessories of beds
  • A61G7/057—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor
  • A61G7/05769—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor with inflatable chambers

Definitions

• the present invention relates to the field of inflatable anti-decubitus mattresses which are used in hospital or similar or private homes, for the bed rest of people for long periods.
• the invention relates to a new inflatable cell of anti-decubitus mattress, and an anti-decubitus mattress comprising a plurality of inflatable cells.
• a known solution to date consists in proposing inflatable anti-foam mattresses, which comprise a plurality of juxtaposed inflatable cells.
• This type of mattress is described, for example, in US Pat. No. 5,004,084.
• the cells of an anti-decubitus mattress are individually inflatable by means of a compressor or the like and in a so-called "dynamic" mode characterized by a sequence and a pre-defined inflation cycle, so as to reduce the compression times of the body parts in contact with the cells of the mattress. For example, it is cyclical to inflate one cell in two.
• the characteristics of this dynamic mode are generally configurable in order to best adapt them to the bedridden person.
• an inflatable anti-fall prevention cell for anti-decubitus mattresses.
• This cell comprises two outer sheets which are welded on their periphery so as to form an inflatable envelope, and which are fixed by circular welding points to an inner sheet to limit the expansion of the envelope.
• the envelope When inflated, the envelope has a bearing surface having a cup-shaped fall arrest profile with raised ends.
• An object of the invention is to provide a new inflatable cell anti-decubitus mattress which provides a good operation in dynamic mode, avoiding the aforementioned risks of sliding and poor positioning of the cell, compared to a neighboring cell, during repetitive cycles of inflation / deflation, and without the need to fix the cell on a support.
• the invention thus has for its first object an inflatable cell of anti-decubitus mattress defined in claim 1.
• This cell comprises an inflatable envelope, of elongated shape, having two opposite main lateral faces, and several oblong welds, whose longitudinal axis main is oriented substantially perpendicular to the main longitudinal axis of the casing, which are spaced along the length of the casing, and which bind together the two opposite major side faces of the casing.
• Another object of the invention is to provide a new inflatable cell anti-decubitus mattress that reduces for people bedridden at the same time the risk of bedsores and the risk of accidental falls.
• the invention thus has for its second object an inflatable cell of anti-decubitus mattress, said cell comprising an inflatable envelope, of elongated shape, which has two opposite main lateral faces and an upper surface which, in the inflated state of the envelope, forms a superior carrying surface; the two opposite main lateral faces of the cell are welded together on at least three sides of their periphery by means of at least one lower longitudinal weld line and two lateral weld lines, and said lower longitudinal weld line has a curved profile which is made such that in the inflated state of the casing, the carrier surface is deformed so as to have a cup-shaped curved fall arrester with raised ends.
• the invention also has for its third object an inflatable cell of anti-decubitus mattress, said cell comprising an inflatable envelope, of elongate shape, which has two opposite main lateral faces and an upper surface which in the inflated state of the envelope forms a superior carrying surface; said envelope is either (i) made of a sheet folded in two in the direction of its length, and welded on three sides of its periphery by means of a lower longitudinal weld line and two lateral weld lines, and the carrying surface being free of welding, or (ii) consisting of two separate sheets welded together over their entire periphery by means of at least four lines of welds: a lower longitudinal weld line, two lines two side welds, and a line upper longitudinal weld, said cell having one or more additional welds which are spaced along the length of the envelope, and which allow to link between the two opposite major side faces of the envelope, the distance (ei) between each weld additional end and the lateral weld line adjacent to the envelope, measured along
• the invention also has for its fourth object an inflatable cell of anti-decubitus mattress, said cell comprises an inflatable envelope, of elongated shape, which has two opposite main lateral faces, an upper surface which, in the inflated state of the envelope, forms an upper bearing surface, and one or more oblong welds, the main longitudinal axis of which is oriented substantially parallel to the main longitudinal axis of the casing, and which make it possible to bond the two opposite main lateral faces of the casing to each other; , in a way to defining in the envelope at least two superimposed inflation chambers communicating with each other; the upper bearing surface of the envelope in the deflated state has a substantially rectilinear profile over the entire length of the envelope, and the oblong weld or welds are made so that in the inflated state of the envelope the carrier surface is deformed so as to have a curved profile fall arrester cup with raised ends.
• the invention also relates to an anti-decubitus mattress comprising a plurality of inflatable cells referred to above, which are positioned transversely to the longitudinal axis of the mattress, and which are juxtaposed along said longitudinal axis.
• FIG. 1 is a perspective representation of an inflatable cell for an anti-decubitus mattress, produced according to a first variant embodiment
• FIG. 2 is a schematic cross-sectional view of the cell of FIG. 1 in the section plane H-II,
• FIG. 3 is a schematic and partial view in plan view of the cell of FIG. 1;
• FIG. 4 is a diagrammatic representation in flat view and in side view of the cell of FIG. 1 (deflated state),
• FIG. 5 is a diagrammatic representation in flat view and in front view of an inflatable cell for anti-decubitus mattresses, produced according to a second variant embodiment
• FIG. 6 is a schematic representation in a flat view and in front view; of an inflatable cell for anti-decubitus mattress, realized according to a third variant embodiment
• FIG. 7 is a perspective representation of an anti-decubitus mattress cell, in the inflated state and produced in accordance with a fourth embodiment of the invention
• FIG. 8 is a schematic representation of the cell of Figure 7 in the deflated state
• FIG. 9 is a schematic cross section of the cell of FIG. 7 in the IX-IX plane
• FIG. 10 is a view from above of the cell of FIG. 7;
• FIG. 11 is a cross-sectional view in the plane X1-X1 of the cell of FIG. 8;
• FIG. 12 is a longitudinal sectional view in plane XII-XII of the cell of FIG. 6,
• FIG. 13 schematically shows in a side view a set of cells of the invention which are juxtaposed, so as to form an anti-decubitus mattress;
• FIG. 14 schematically shows in a side view a set of cylindrical cells of the prior art which are juxtaposed, so as to form an anti-decubitus mattress
• FIG. 15 is a schematic representation in flat and in lateral view of FIG. a cell in the deflated state, produced according to a fifth embodiment of the invention
• FIG. 16 is a diagrammatic representation in a flat view and in front view of an inflatable cell for anti-decubitus mattresses, produced according to a sixth variant embodiment of the invention.
• FIG. 17 is a schematic representation in a flat view and in front view of an inflatable cell for an anti-decubitus mattress, produced according to a seventh embodiment of the invention.
• FIG. 18 represents a cell, in the inflated state, produced according to an eighth embodiment of the invention.
• FIG. 19 is a schematic side view of the cell of the figure 18.
• FIGS. 1 and 4 show an individual inflatable cell 1 of anti-decubitus mattress, according to a first embodiment of the invention.
• the cell 1 is inflated.
• the cell 1 is shown flat in the deflated state.
• This cell 1 comprises an inflatable envelope 2 of elongate shape and longitudinal main axis 2a.
• this envelope 2 is constituted by a sheet 20 of substantially rectangular shape of heat-sealable material, for example polyurethane.
• this sheet 20 is folded in two on itself in the direction of its length along a substantially straight longitudinal upper folding line 20a (schematized by a dashed line in FIG. 3).
• the two longitudinal edges of the sheet 20 which are folded one above the other are referenced 20b, and the two side edges of the sheet 20 which are folded one above the other are referenced 20c.
• the folded sheet 20 is heat sealed on three sides of its periphery by means of a longitudinal weld line less than 4 (opposite the top fold line 20a) in length 1_ 2, less than the length L of the sheet 20, and two lateral weld lines 5 which extend said longitudinal weld line 4 at both ends thereof and extend to the upper longitudinal fold line 20a of the sheet 20.
• the two faces 20d, 20e of the sheet 20 (FIGS. 1 and 4) which are folded one above the other form the two main lateral faces of the inflatable envelope 2.
• the lower longitudinal weld 4 has a particular arcuate curved profile whose vertex 4a is oriented towards the upper fold line 20a.
• the distance H 2 between this vertex 4a of the weld 4 and the upper fold line 20a which corresponds to the upper longitudinal edge of the envelope 2 in the deflated state is smaller than the height Hi of the lateral welds 5.
• the dimension H 2 corresponds to the height in the center of the envelope 2 in the deflated state
• the dimension Hi corresponds to the height at the ends of the envelope 2 at the deflated state.
• the casing 2 also has an inner sheet 6 of heat-seal material, for example polyurethane, which was positioned between the two faces 2Od 1 20th sheet 20 folded one above the other, before heat sealing of the two surfaces 20d, 20th.
• Each main face 20d, 20e of the envelope 2 is fixed to the inner sheet 6, by means of vertical oblong heat-sealing 7A and 7B, of principal longitudinal axis 7a, length L 3 and width I 3 (L 3 > l 3 ).
• the main longitudinal axis 7a of the welds 7A, 7B is oriented substantially perpendicular to the main longitudinal axis 2a of the envelope 2, and the welds 7A, 7B are spaced along the length of the envelope 2.
• Each weld 7A, 7B has a peripheral edge 7b forming a closed oblong contour.
• the face 20d or 20e of the sheet 20 is welded over the entire surface located inside the peripheral edge 7b.
• the face 20d or 20e of the sheet 20 may be welded only along a weld line of small width corresponding to said elongated peripheral contour 7b.
• the oblong heat-sealing 7A corresponds to the welds of the face 2Od of the envelope 2 with the inner sheet 6, and the oblong heat-sealing 7B (in dashed lines in FIGS. 1 and 4) correspond to the welds on the other side 20e of the envelope 2 with the inner sheet 6.
• These welds 7A and 7B are alternated along the length (Y direction) of the envelope 2.
• the weld lines 4 and 5 and the oblong welds 7A, 7B are for example made by high frequency welding.
• welds 7A and 7B are all identical. This characteristic is however not essential.
• the welds 7A (respectively 7B) of a face 20d (respectively 20e) are substantially equidistant along the longitudinal axis 2a of the cell. This characteristic is however not essential.
• the invention is not limited to the particular number of welds 7A,
• the cell of the invention possibly comprising more welds 7A, 7B or less welds 7A, 7B than the variant of FIG. 4,
• the number of welds 7A 1 7B and their spacing depends in particular on the length of the inflatable envelope.
• the cell 1 comprises an inflation tip 8, for example made of plastic, which can incorporate a valve, and which allows rapid inflation and deflation of the casing 2.
• This tip 8 is fixed, for example by gluing, on the envelope 2 at the opening 3.
• This nozzle 8 is intended to be connected to a compressor (not shown) for example by means of a flexible tubing to allow inflation and deflation of the casing 2 of the cell 1.
• the upper face of the inflated cell which extends on either side of the fold line 20a forms an upper bearing surface SP (FIGS. 1 and 2) in contact with which the body of the bedridden person.
• this carrier surface SP is free of welding, and is thus advantageously smooth.
• a plurality of cells 1 are juxtaposed against each other along the longitudinal axis X, each cell 1 being positioned perpendicularly (Y axis) to this longitudinal axis X and the main face 20d of a cell being in contact with the main face 20e of a neighboring cell.
• the envelope 2 of the cell are preferably attached means 9, for example snaps, allowing, where appropriate, to quickly assemble two adjacent cells 1 together during the constitution of the mattress.
• the cells 1 are placed on a flat support such as a bed base, without being fixed to this flat support.
• all the cells 1 are not inflated simultaneously, but are inflated and deflated individually according to a programmed cycle, so as to modify cyclically the compression points on the body of the person lying down on the mattress, which reduces the risk of pressure ulcer formation.
• each portion 20f of the main face 20d (respectively 20e) of the casing 2 located between two adjacent welds 7A (respectively 7B) advantageously forms, thanks to the implementation of vertical oblong welds 7A (respectively 7B), a pad whose outer face is convex only over the entire height of the casing 2, and has no concave portion, unlike what can be obtained for example with a cell of Figure 1 of the application of FR 2,883,728 or the cells of FIGS. 2 and 3 of US Pat. No. 5,109,560. This avoids the risk of vertical sliding and incorrect positioning of a cell 1 in height relative to a neighboring cell. during repeated cycles of inflation / deflation of the cells of the mattress.
• the oblong welds 7A, 7B are substantially centered between the lower longitudinal weld line 4 and the upper longitudinal edge of the casing 2 in the deflated state, that is to say in the variant of Figure 4, the upper fold line 20a.
• each weld 7A, 7B is chosen so as to obtain the formation of the above-mentioned pads 2Of with a convex surface only.
• the length L 3 of each weld 7A, 7B is at least equal to 30% of the height Hi maximum of the envelope 2 in the deflated state ( Figure 4) and / or preferably at least 50% of Ia height H 4 of the inner sheet 6 to deflection limiter function.
• the inner sheet 6 has the function of limiting the expansion of the casing 2 in the direction X which is perpendicular to the two main faces 20d 1 20e of the casing 2, and thus allows limit the width of the envelope 2 to the inflated state. It also allows in combination with the oblong welds 7A, 7B to obtain a cell 1 which is mechanically robust, and whose welds 7A, 7B are not altered after intensive use.
• the cell may be free of inner sheet 6 and the main faces 2Od, 20e may be welded directly together by means of vertical oblong welds 7A 1 7B in a manner comparable to the cell of Figure 7 described - After whose two main faces 20d, 20e are welded together by means of oblong welds 7 horizontal.
• the upper bearing surface SP is advantageously automatically deformed so as to have a curved anti-fall profile forming a trough oriented along the longitudinal axis 2a of the cell with raised ends 20g (FIG. 1).
• This cup-shaped profile with raised ends 20g advantageously makes it possible to prevent the sliding in the Y direction of a person lying on a mattress M comprising cells juxtaposed in the X direction, and thus to stabilize laterally this person in a central position on the mattress M. Thus significantly reduces the risk of accidental fall.
• Ia difference in height ⁇ H between the heights Hi and H 2 is preferably, but not necessarily at least equal to 3 cm, and more particularly still at least equal to 5 cm.
• the longitudinal weld 4 could have another curved profile for obtaining the cup-shaped fall arrest profile for the carrier surface SP, when the envelope 2 is inflated.
• the longitudinal weld 4 could have another curved profile making it possible to obtain a height H 2 at the center of the envelope that is smaller than the height Hi at the ends of the envelope 2.
• top of the lower longitudinal weld 4 is substantially centered with respect to the casing 2 along the longitudinal axis 2a of the casing. This characteristic, although preferential, is however not essential.
• the smallest distance ei between each end weld 7A and the adjacent lateral weld 5 of the envelope, measured along the longitudinal axis 2a of the envelope, is greater than or equal to higher preference, at the smallest distance e 2 between said weld 7A and the upper fold line 20a of the casing 2.
• the distance e1 is substantially equal to the distance e2. If it is desired to accentuate more significantly the lifting of the ends 20g of the carrier surface SP, a distance e1 greater than the distance e2 will preferably be implemented, as implemented for example for the variant of FIG. described below.
• This dimensional characteristic (e1 ⁇ e2) is however optional to obtain the fall arrest profile, when a lower weld line 4 having the curved profile of FIG. 4 is implemented.
• e1 ⁇ e2 is smaller than the distance e2 and which nevertheless makes it possible to obtain a cup-shaped fall arrest profile for the carrier surface SP of the cell, by virtue of the implementation of the curved longitudinal bottom weld 4.
• the inner sheet 6 used is for example a rectangular sheet of length L 4 equal to 950 mm, width H 4 is 180 mm and thickness is 0.2 mm.
• FIG. 6 shows another variant embodiment, which makes it possible to obtain a bearing surface having a cup-shaped fall arrest profile.
• a lower longitudinal weld 4 having a curved profile that provides a carrier surface SP with a cup-shaped fall arrest profile, when the envelope 2 is inflated.
• the variant of Figure 6 differs from the variant of Figure 4 mainly by the implementation of pairs of 7'A welds (respectively 7'B) circular instead of oblong welds 7A (respectively 7B). Unlike the variant of FIG. 4, this variant does not, however, make it possible to obtain the above-mentioned pads 2Of with a convex surface only.
• FIGS. 7 and 8 show an individual inflatable cell V of anti-decubitus mattress, in accordance with another variant embodiment of the invention.
• the cell 1 is inflated.
• cell V is shown flat in the deflated state.
• this cell has an inflatable envelope 2, of elongated shape and main axis longitudinal 2a.
• This envelope 2 is constituted by a sheet 20 of substantially rectangular shape of heat-sealable material, for example polyurethane.
• This sheet 20 is folded in two on itself in the direction of its length along a longitudinal upper fold line 20a.
• the common elements between this cell 1 ! of Figure 6 and the cell 1 of Figure 1 are identified by the same references.
• the folded sheet 20 is heat-sealed on three sides of its periphery by means of a lower longitudinal weld line 4 'of length L 2 , smaller than the length Li of the sheet 20, and two lateral weld lines 5 which extend said longitudinal weld line 4 'at its two ends, and which extend up to the upper longitudinal fold line 20a of the sheet 20.
• the lower welding line 4 ' is not curved but is substantially straight.
• the cell 1 has no internal sheet 6 with a displacement limiter function, and the two main lateral faces 20d, 20e of the inflatable envelope 2 are heat-sealed directly to the body. one with the other by means of a line of oblong welds 7, longitudinal axis 7a, length L 3 and width I 3 (L 3 > 3 ).
• Each weld 7 has a peripheral edge 7b forming a closed oblong contour.
• the two faces 20d, 20e of the sheet 20 are welded over the entire surface located inside the peripheral edge 7b.
• the two faces 20d, 20e of the sheet 20 may be welded only along a weld line of small width corresponding to said oblong peripheral contour 7b.
• the welds 7 are oriented so that their main longitudinal axis 7a is substantially parallel to the longitudinal main axis 2a of the envelope 2.
• the welds 7 are further positioned by relative to the others, being spaced and aligned along the main longitudinal axis 2a of the envelope 2.
• the welds 7 make it possible to define in the envelope 2 two superimposed chambers, namely a lower chamber 2b and an upper chamber 2c (FIG. 10), which extend over the entire length L 2 of the envelope 2, and which communicate between them thanks to the spaces E (figure
• the air contained in the upper chamber 2c can be rapidly evacuated via the nozzle 8 through the lower chamber 2b, which allows rapid deflation of the two cushions C1 and C2.
• the welds 7 are identical and the distances d between two adjacent welds 7, measured along the longitudinal axis 2 a of the envelope, are identical.
• the welds 7 may have a different oblong shape, and may also not be identical; the spacing of welds 7 is not necessarily constant.
• it is implemented four welds 7 aligned and spaced. This particular number of welds 7 is not limiting of the invention.
• the weld line 7 is made substantially at half height H of the envelope 2, so that the cushions C1 C2 advantageously have substantially the same volume.
• the height position of the weld line 7 could nevertheless be different, and therefore the volumes of the two cushions C1 and C2 could be different.
• the distance d between two adjacent welds 7 affects the capacity of the air to pass more or less easily from one chamber 2b to the other 2c, and thus influences the ease and speed of inflation of the cushions C1 and C2.
• the length of the welds 7 must be large enough to obtain a mechanical strength of the welds 7 which is sufficient and reliable over time. It is therefore necessary to select the length L 3 of the welds 7 and the distance d between welds 7, taking into account these two contradictory constraints. In the variant embodiment of FIGS.
• this distance d between two adjacent welds 7 is slightly greater than the length L 3 of a weld 7. In another variant, this distance d between two adjacent welds 7 could be equal to or less than the length L 3 of a weld 7.
• the total length of the welds 7 (sum of the lengths L 3 ) is at least equal to 40% of the total length L 2 of the inflation chambers 2b , 2c.
• the envelope 2 of the cell 1 comprises only two superposed chambers 2b, 2c corresponding to the superposed cushions C1 and C2.
• the envelope 2 of the cell 1 comprises only two superposed chambers 2b, 2c corresponding to the superposed cushions C1 and C2.
• FIG 13 there is shown schematic an anti-decubitus mattress M of the invention made by means of a plurality of cells 1 'which are juxtaposed against each other along the longitudinal axis X of the mattress, each cell V being positioned perpendicularly to this longitudinal axis X (longitudinal axis 2a of each cell perpendicular to the X axis).
• each cell 1 has an upper carrier surface SP of maximum width L ma ⁇ ( Figures 10, 11) low and has a height H 'in the inflated state which is greater than said maximum width L max .
• the upper carrier surface SP is free of welding line.
• the maximum width L max of a cell V in the inflated state should preferably not be too low either. Indeed, if this width L m a is too small, the total contact area at each cycle between the bedridden person and the SP bearing surfaces of the inflated cells may become too great, and suppress the dynamic effect of relieving the bedridden person. . In practice it is preferable that this total contact area is between 50% and 75%.
• the cell 1 of the invention is preferably designed to have a maximum width Lmax in the inflated state of between 6 cm and 9 cm. More particularly, in a preferred embodiment, the V cell has been designed to have a maximum width L ma ⁇ optimal of the order of 7cm to 8 cm.
• the two main lateral faces 20d, 20e of the casing 2 are welded together so that when inflated, the casing 2 comprises a carrier upper surface SP having a profile. bowl-shaped fall arrester with raised 20g ends.
• These raised ends 20g advantageously make it possible to prevent the lateral sliding (FIG. 7 / Y axis) of a person lying on the mattress M, and to laterally stabilize this person in a central position on the mattress M. This considerably reduces the risks. accidental fall.
• the upper bearing surface SP of the casing 2 is substantially rectilinear ( Figure 7).
• the two main lateral faces 20d, 20e of the casing 2 are welded to one another so that the inflation of the casing 2 causes a deformation of the bearing surface SP of the casing 2 in the form of a bowl with 20g ends raised (Figure 7).
• Figure 7 it is appropriate to judiciously position the two end welds 7 closest to the side welds 5, so that during the inflation of the envelope 2, these end welds 7 exert relative to the lateral weld lines 5 a traction for lifting the upper ends 20g, as shown in Figure 7.
• this is achieved in particular by providing between each weld 7 end and the weld line adjacent side 5, a distance ei measured along the longitudinal axis 2a of the envelope which is equal to or slightly greater than the distance e 2 (measured perpendicularly to the longitudinal axis 2a) between said weld 7 and the upper fold line 20a of the sheet 20 constituting the envelope 2.
• FIG. 15 shows another alternative embodiment of a cell 1 'of the invention comprising a single oblong weld 7.
• FIG. 16 shows another alternative embodiment of a cell 1 "of the invention, which, in a manner comparable to the variant of FIG. 7, comprises an oblong weld line 7, of oval shape, whose longitudinal axis 7a is substantially parallel to the longitudinal axis 2a of the cell, and which differs from the variant of Figures 7 and 8 mainly by the implementation of a lower longitudinal weld line 4 which has a curved profile similar to that of the variant of Figure 1, so as to obtain the cup-shaped fall arrest profile for the carrier surface SP
• the distance e1 is also much greater than the distance e2 so as to accentuate the lifting effect of the 20g ends of the casing 2 during its inflation, and improve the fall arrest effect.
• FIG. 17 shows another variant embodiment of a cell of the invention, which differs from the cell of FIG. 16 only by the use of two separate sheets 20d, 20e, Instead of a single sheet 20 folded in two, these two separate sheets 20d, 20e are welded to each other over their entire periphery by means of four lines of welds: the three weld lines 4,5 described above, and a weld line. additional longitudinal longitudinal 11, which replaces the fold line 20a.When the envelope 2 of this cell of FIG 17 is inflated, the carrier surface SP extends on either side of this upper weld line 11.
• FIGS. 1, 5, 6, 7, and 15 could also be modified so as to replace the folded sheet 20 in two (with upper fold line 20a) by two separate sheets 20d, 20e welded in a contour closed by a lower longitudinal weld line 4 (or 4 ') extended at both ends by two lateral welds 5, they- they are interconnected by an upper longitudinal weld line 11.
• FIG. 18 shows another alternative embodiment of a cell of the invention comprising an inflatable envelope 2 having, in the inflated state, two main lateral faces 20d, 20e, an upper bearing surface SP, a lower bottom face F. and two end faces F '.
• This cell further comprises an inner sheet 6 'of substantially rectangular shape, which limits the expansion of the cell thickness (direction X).
• the main face 20d of the cell is welded to one of the longitudinal edges of the inner sheet 6 'by means of an oblong longitudinal weld 7.
• the other main face 20e of the cell is welded to the other longitudinal edge of the the inner sheet 6 'by means of an oblong longitudinal weld 7.
• the envelope of the cell also comprises external reinforcing welds S (in thicker lines) which, at the two end faces F 'of the cell, have an I-shaped profile and which allow a shaping of the cell.
• the inner sheet 6 ' is substantially horizontal, that is to say oriented substantially perpendicular to the two main lateral faces 20d, 20e, and the envelope forms two superimposed cushions C1, C2.
• the longitudinal oblong welds 7 do not extend to the two end faces F 'and each have a length L 3 sufficiently small that at the inflated state of the envelope, the upper bearing surface SP is deformed into so to present a cup-shaped fall arrest profile with raised 20g ends (volume in the center of the envelope smaller than the volume of the envelope at its ends). More particularly to obtain this fall arrest profile, the distance e1 which separates each end of a longitudinal weld 7 from the adjacent end face F 'and which is measured along the longitudinal axis 2a of the envelope, is greater than or equal to the distance e 2 separating said end of the weld 7 and the carrier surface SP, and which is measured in the direction (Z) perpendicular to the longitudinal axis 2a.
• the cell of FIGS. 18 and 19 can also be modified by replacing a longitudinal weld 7 by a line of several longitudinal welds 7 of shorter length and spaced in the longitudinal direction 2a of the cell, in a manner comparable to the previously described variant of FIG. figure 7.

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• Mattresses And Other Support Structures For Chairs And Beds (AREA)

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• 2009
  • 2009-11-04 WO PCT/FR2009/001275 patent/WO2010052389A1/fr active Application Filing
  • 2009-11-04 EP EP12171269.9A patent/EP2500004B1/de active Active
  • 2009-11-04 US US13/126,295 patent/US20110203053A1/en not_active Abandoned
  • 2009-11-04 EP EP12171275.6A patent/EP2500005B1/de active Active
  • 2009-11-04 EP EP09759755.3A patent/EP2341883B9/de active Active

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