Trauma Covering Material

Abstract

A pressure gradient type wound dressing (1,101,201,301,401), wherein the wound dressing includes an absorbent pad (10,110,210,310,410) having a shape including two extending portions and at least one wing portion, wherein the short side of the first extending portion (11,111,211,311,411) abuts against the long side of the second extending portion (12,112,212,312,412), and the at least one wing portion (14,114,214,314,414) extends between the long side of the first extending portion and the long side of the second extending portion.

Description

[Technical Field]

[0001] This invention relates to the shape of a wound dressing, and more particularly to the shape of a wound dressing used with a non-atmospheric pressure source. [Background technology]

[0002] It is well known that wound dressings are manufactured for use on wounds to aid in wound healing and prevent infection. Depending on the location of the wound, such dressings may need to adhere to (or be attached to) the patient's body. This may require the dressing to adhere to areas with irregular shapes, highly contoured (or uneven) surfaces, or relatively mobile areas. This can make initial adhesion of the dressing difficult and further limit the subsequent wearing time.

[0003] To address this problem, healthcare practitioners will often use additional fixation methods for applying wound dressings, which can result in additional time and expense, as well as reduced patient comfort. To help mitigate this, manufacturers have often focused on providing dressings with shapes specific to each site. However, this not only complicates the design and manufacture of dressings with different shapes and sizes, but also requires healthcare providers to have many different types and sizes of dressings on hand. Furthermore, to reduce the risk of dressing misuse, healthcare practitioners are required to be educated and / or have experience with many different types of wound dressings.

[0004] Furthermore, when wound dressings are used with a non-atmospheric pressure source, for example in negative pressure wound therapy, it is important to ensure that the wound dressing provides a sufficient degree of airtightness over the wound to allow the pressure difference to be consistently applied.

[0005] The present invention aims to provide a wound dressing having a shape that helps to alleviate some of the problems with existing wound dressing shapes. [Overview of the project]

[0006] The present invention provides a wound dressing as described in the appended claims.

[0007] This disclosure provides a wound dressing comprising an absorbent pad. The wound dressing may be a pressure gradient type wound dressing. The absorbent pad may have a shape comprising two elongate portions. The absorbent pad may have a shape comprising at least one wing portion. The short side of the first elongate portion may abut the long side of the second elongate portion. At least one wing portion may extend between the long side of the first elongate portion and the long side of the second elongate portion.

[0008] According to a first aspect of the present invention, a pressure gradient type wound dressing is provided, the wound dressing comprising an absorbent pad having a shape including two extensions and at least one wing portion, wherein the short side of the first extension abuts against the long side of the second extension, and the at least one wing portion extends between the long side of the first extension and the long side of the second extension.

[0009] Advantageously, by providing wings between the two extended portions of the absorbent pad, both are provided: an improved ability of the covering material to conform to the contoured wound site, and an increase in the volume of the absorbent pad near the wound site.

[0010] The short side of the first extension may abut the long side of the second extension at its end. Such an arrangement of extensions provides an L-shaped absorbent pad, which may be particularly beneficial for linear wounds and allows a non-atmospheric pressure source to be supplied at a location away from the wound site, thereby improving healing.

[0011] The short side of the first extension may abut the long side of the second extension at a point between its two ends. The short side of the first extension may abut the long side of the second extension at its midpoint. Such an arrangement of extensions provides a T-shaped absorbent pad, which is particularly advantageous in that it allows for increased versatility of the covering material and can be used for linear and punctate wounds, in which case the intersection of the extension and wing provides a relatively large surface area.

[0012] The first and second extensions may be positioned at angles between 0 and 180° relative to each other, preferably between 30 and 150° relative to each other, more preferably between 45 and 135° relative to each other, for example between 60 and 120° relative to each other, for example between 75 and 105° relative to each other, for example at an angle of about 90° relative to each other, that is, the first and second extensions may be positioned perpendicular to each other.

[0013] The wound dressing may include two wings. The first wing may extend from the first long side of the first extension to the long side of the second extension. The second wing may extend from the second long side of the first extension to the long side of the second extension.

[0014] The wing portion or each wing portion may have a triangular shape. The wing portion or each wing portion may have sides having a curved contour. The wing portion or each wing portion may have sides having a concave arc-shaped contour.

[0015] The concave arc shape may have a radius of curvature of at least 20 mm, at least 25 mm, at least 30 mm, at least 35 mm, at least 40 mm, at least 45 mm, at least 50 mm, at least 55 mm, at least 60 mm, at least 65 mm, at least 70 mm, at least 75 mm, or at least 80 mm.

[0016] The concave arc shape may have a radius of curvature between 20 and 80 mm, preferably between 20 and 600 mm, more preferably between 25 and 45 mm, for example between 28 and 32 mm, for example 30 mm.

[0017] Advantageously, such a concave arc shape having such a radius of curvature provides an improvement in the degree of conformity to the contour of the wound site and an increase in the volume of the absorbent pad in the vicinity of the wound site without hindering the ability of the covering material to be sharply bent (e.g., around the heel) or without unduly increasing the bulk of the covering material.

[0018] The concave arc shape may have a radius of curvature of at least 20% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 25% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 30% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 35% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 40% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 45% of the width of one or both of the extensions. The concave arc shape may have a radius of curvature of at least 50% of the width of one or both of the extensions.

[0019] Advantageously, such a concave arc shape having such a radius of curvature provides an improvement in the degree of conformity to the contour of the wound site and an increase in the volume of the absorbent pad in the vicinity of the wound site without hindering the ability of the covering material to be sharply bent (e.g., around the heel) or without unduly increasing the bulk of the covering material.

[0020] The wing part or each wing part may have an area equal to at least 0.8% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 0.9% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 1% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 1.1% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 1.2% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 1.3% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 1.5% of the total area of the absorption pad. The wing part or each wing part may have an area equal to at least 2% of the total area of the absorption pad.

[0021] The wing part or each wing part is at least 1.5 cm 2 , at least 1.6 cm 2 , at least 1.7 cm 2 , at least 1.8 cm 2 , at least 1.9 cm 2 , or at least 2.0 cm 2 and may have an area.

[0022] Advantageously, by providing the wing part or each wing part with the above-described area, the volume of the absorption pad in the vicinity of the wound site is improved without excessively changing the shape of the covering material.

[0023] One or more or each short side of the short sides of the second extending part of the absorption pad may include a notch. The notch or each notch may have an angular contour. The notch or each notch may have a curved contour.

[0024] By providing notches on one or both short sides of the second extension, the ability of the second extension to conform to the contour of the wound site is improved, a preferred point for initiating a fold is provided, and the ability of the adjacent dressing to form a cup-shaped or dome-shaped form is improved. This effect is particularly pronounced when the notches have a curved contour. A curved contour has the additional advantage of improving manufacturability.

[0025] The first extension may have a substantially quadrilateral perimeter. The first extension may have a substantially rectangular perimeter. The first extension may include two parallel sides. The first extension may include two sides that taper toward each other. The first extension may include at least two straight sides.

[0026] The second extension may have a substantially quadrilateral perimeter. The second extension may have a substantially rectangular perimeter. The second extension may include two parallel sides. The second extension may include two sides that taper toward each other. The second extension may include at least two straight sides.

[0027] The first extension, the second extension, and at least one wing may define (or define) the outer circumference of the absorbent pad. The first extension may define a portion of the outer circumference of the absorbent pad. The second extension may define a portion of the outer circumference of the absorbent pad. At least one wing, or each wing, may define a portion of the outer circumference of the absorbent pad.

[0028] The wound dressing may include an opening. The opening may be configured to connect the wound dressing to a non-atmospheric pressure source. The opening may be located on a first extension. The opening may be located on the first extension distal to a second extension. The opening may be located through the dressing layer.

[0029] The wound dressing may include a wound contact layer. The wound dressing may include a covering layer. The wound dressing may include an adhesive (or tacky) skin contact layer. The wound dressing may include an absorbent layer. The wound dressing may include a transmission layer. The wound dressing may include a fluid distribution layer. The wound dressing may include a wicking layer. The wound dressing may include an absorbent layer. The wound dressing may include a superabsorbent layer. The wound dressing may include a foam layer. The wound dressing may include a pressure distribution layer. The wound dressing may include a gauze layer. The wound dressing may include an interlayer adhesive layer.

[0030] The absorbent pad may include a wound contact layer. The absorbent pad may include an absorbent layer. The absorbent pad may include a transfer layer. The absorbent pad may include a fluid distribution layer. The absorbent pad may include a wicking layer. The absorbent pad may include an absorbent layer. The absorbent pad may include a superabsorbent layer. The absorbent pad may include a foam layer. The absorbent pad may include a pressure distribution layer. The absorbent pad may include a gauze layer. The absorbent pad may include an interlayer adhesive layer.

[0031] The absorbent pad may have a "T-shaped" outer shape. The absorbent pad may have an "L-shaped" outer shape.

[0032] The wound contact layer may have a T-shaped outline. The covering layer may have a T-shaped outline. The adhesive skin contact layer may have a T-shaped outline. The absorbent layer may have a T-shaped outline. The transfer layer may have a T-shaped outline. The fluid distribution layer may have a T-shaped outline. The wicking layer may have a T-shaped outline. The absorbent layer may have a T-shaped outline. The superabsorbent layer may have a T-shaped outline. The foam layer may have a T-shaped outline. The pressure distribution layer may have a T-shaped outline. The gauze layer may have a T-shaped outline. The interlayer adhesive layer may have a T-shaped outline. The adhesive skin contact layer may be placed on the covering layer and may have the same outline. The wound dressing (i.e., the outer edge of the entire dressing) may have a T-shaped outline.

[0033] The wound contact layer may have an L-shaped outline. The covering layer may have an L-shaped outline. The adhesive skin contact layer may have an L-shaped outline. The absorbent layer may have an L-shaped outline. The transfer layer may have an L-shaped outline. The fluid distribution layer may have an L-shaped outline. The wicking layer may have an L-shaped outline. The absorbent layer may have an L-shaped outline. The superabsorbent layer may have an L-shaped outline. The foam layer may have an L-shaped outline. The pressure distribution layer may have an L-shaped outline. The gauze layer may have an L-shaped outline. The interlayer adhesive layer may have an L-shaped outline. The adhesive skin contact layer may be placed on the covering layer and may have the same outline. The wound dressing (i.e., the outer edge of the entire dressing) may have an L-shaped outline.

[0034] The first extension of the absorbent pad may be tapered. The width of the first extension of the absorbent pad may decrease as it moves away from the interface with the second extension of the absorbent pad. The tapering may be terminated with a rounded end.

[0035] The wound dressing may comprise at least two layers. The wound dressing may comprise a wound contact layer and a covering layer. The covering layer may extend outward beyond the outer periphery of the wound contact layer. The covering layer may extend outward by an equal distance around the entire circumference of the outer periphery of the wound contact layer. Adhesive may be provided at the boundary of the covering layer. Adhesive may be provided in a portion of the covering layer that extends outward beyond the outer periphery of the wound contact layer. Adhesive may be provided in the region of the covering layer that extends between the outer periphery of the wound contact layer and the outer periphery of the covering layer.

[0036] The wound dressing may include at least two layers selected from the following: a wound contact layer, an adhesive skin contact layer, a covering layer, a fluid distribution layer, a wicking layer, an absorbent layer, a superabsorbent layer, a transfer layer, a foam layer, a pressure distribution layer, a gauze layer, and / or an interlayer adhesive layer.

[0037] The wound dressing may comprise at least three layers selected from the following: a wound contact layer, an adhesive skin contact layer, a covering layer, a fluid distribution layer, a wicking layer, an absorbent layer, a superabsorbent layer, a transfer layer, a foam layer, a pressure distribution layer, a gauze layer, and / or an interlayer adhesive layer. Preferably, the wound dressing may comprise a wound contact layer, a covering layer, and one additional layer listed above. More preferably, the additional layer is a superabsorbent layer. The additional layer may be positioned between the wound contact layer and the covering layer. The additional layer may have the same external shape as the wound contact layer. The additional layer may have a T-shaped external shape. The additional layer may have an L-shaped external shape. The wound contact layer and the additional layer may be the same size. The wound contact layer and the additional layer may be different sizes. The additional layer may be larger than the wound contact layer. The additional layer may be smaller than the wound contact layer. The covering layer may have the same shape as the wound contact layer and / or additional layer. The covering layer may be larger than the wound contact layer and / or additional layer.

[0038] The wound dressing may comprise at least four layers selected from the following: a wound contact layer, an adhesive skin contact layer, a covering layer, a fluid distribution layer, a wicking layer, an absorbent layer, a superabsorbent layer, a transfer layer, a foam layer, a pressure distribution layer, a gauze layer, and / or an interlayer adhesive layer. Preferably, the wound dressing comprises a wound contact layer, a covering layer, and two additional layers listed above. More preferably, the two additional layers are a superabsorbent layer and a transfer layer. The additional layers may be positioned between the wound contact layer and the covering layer. If the additional layers are a superabsorbent layer and a transfer layer, the layers may be in the order of wound contact layer, transfer layer, superabsorbent layer, and covering layer. One or both of the additional layers may have the same external shape as the wound contact layer. The two additional layers may have the same external shape. The two additional layers may have different external shapes. One or both of the additional layers may have a T-shaped external shape. One or both of the additional layers may have an L-shaped external shape. The wound contact layer and / or the additional layer, or both, may be the same size. The wound contact layer and / or the additional layer, or both, may be different sizes. One or both of the additional layers may be larger than the wound contact layer. One or both of the additional layers may be smaller than the wound contact layer. The covering layer may have the same shape as the wound contact layer and / or one or both of the additional layers. The covering layer may be larger than the wound contact layer and / or one or both of the additional layers. If the additional layers are a superabsorbent layer and a transfer layer, the wound contact layer, superabsorbent layer and transfer layer may have the same T-shape, and the covering layer may be rectangular.

[0039] The wound dressing may comprise at least five layers selected from the following: a wound contact layer, an adhesive skin contact layer, a covering layer, a fluid distribution layer, a wicking layer, an absorbent layer, a superabsorbent layer, a transfer layer, a foam layer, a pressure distribution layer, a gauze layer, or an interlayer adhesive layer. Preferably, the wound dressing comprises a wound contact layer, a covering layer, and three additional layers listed above. More preferably, the three additional layers are a superabsorbent layer, a transfer layer, and an adhesive skin contact layer. The additional layers may be positioned between the wound contact layer and the covering layer. If the additional layers are a superabsorbent layer, a transfer layer, and an adhesive skin contact layer, the layers may be in the order of adhesive skin contact layer, wound contact layer, transfer layer, superabsorbent layer, and covering layer. One or more of the additional layers, or each additional layer, may have the same external shape as the wound contact layer. Two of the three additional layers may have the same external shape. The three additional layers may have the same external shape. The three additional layers may have different external shapes. One or more of the additional layers, or each additional layer, may have a T-shaped external shape. One or more of the additional layers, or each additional layer, may have an L-shaped external shape. The wound contact layer and one or more of the additional layers, or each additional layer, may be the same size. The wound contact layer and one or more of the additional layers, or each additional layer, may be different sizes. One or more of the additional layers, or each additional layer, may be larger than the wound contact layer. One or more of the additional layers, or each additional layer, may be smaller than the wound contact layer. The covering layer may have the same shape as the wound contact layer and / or one or more of the additional layers, or each additional layer. The covering layer may be larger than the wound contact layer and / or one or more of the additional layers, or each additional layer.

[0040] At least two layers of the absorbent pad may be laminated together. At least two layers of the wound contact layer, the transfer layer, and the superabsorbent layer may be laminated together. Laminating two or more layers of the absorbent pad is advantageous because, for example, some known wound dressings in the prior art typically have an adhesive layer that forms an external housing or envelope together with the dressing layer, and the remaining layers (e.g., the wound contact layer and the absorbent layer) are housed inside. The adhesive layer is usually connected to the lining layer and the outer surface of the absorbent structure (usually the wound contact layer) to fix the absorbent structure. The adhesive layer also adheres the wound dressing to the skin around the wound. Therefore, the adhesive layer is commonly wetted with wound exudate during use, which may reduce the adhesive strength between the adhesive layer and the absorbent structure. In this case, the absorbent structure may partially or completely separate, which adversely affects the application of negative pressure to the wound site and the wound dressing's ability to retain wound exudate.

[0041] When a wound dressing includes lamination of at least two layers among the wound contact layer, transmission layer, and superabsorbent layer of an absorbent pad, the degree of reliance on an external adhesive layer to bind the absorbent structure together is reduced or eliminated. Therefore, the present invention does not suffer from the disadvantages of the prior art described above.

[0042] Furthermore, the present invention does not rely on additional covering and binding members to bind the absorbent pads together, some of which require specialized manufacturing processes and techniques for integration into wound dressings. The present invention uses a simple lamination technique to enhance the strength and integrity of the absorbent structure. Therefore, the wound dressing of the present invention is less expensive and easier to manufacture than some conventional wound dressings.

[0043] Even more advantageously, since the present invention does not require relatively rigid covering and bonding members, the absorbent structure is less rigid than that of the conventional absorbent structure. Therefore, by providing lamination between two or more layers of the absorbent pad, a flexible negative pressure wound dressing is provided, which in some cases is more flexible than that of the conventional negative pressure wound dressing. As a result, the conformity to the contours of the patient's body at the wound site is increased during use, and consequently, patient comfort is increased.

[0044] The wound contact layer, the transfer layer, and the superabsorbent layer may all be laminated together.

[0045] The opening may partially extend into the absorbent pad. The opening may extend into the interior of at least one layer. The opening may extend through at least one layer. The opening may extend through at least one layer of the absorbent pad. The opening does not have to extend into the interior of at least one layer of the absorbent pad. The opening does not have to penetrate at least one layer of the absorbent pad. The opening may be provided through the superabsorbent layer. The opening may be provided within the absorbent layer. The opening may be provided within the transfer layer. The opening may be provided within the fluid distribution layer. The opening may be provided within the wicking layer. The opening may be provided within the absorbent layer. The opening may be provided within the foam layer. The opening may be provided within the pressure distribution layer. The opening may be provided within the gauze layer. The opening may be provided within the interlayer bonding layer.

[0046] The area of ​​the covering layer within the range defined by the adhesive boundary may be closed, sealed, and / or continuous. The area of ​​the covering layer within the range defined by the adhesive skin contact layer may be closed, sealed, and / or continuous. This limits or prevents the entry of microorganisms, bacteria, etc., into the wound site.

[0047] The wound dressing may include a release layer, which, when removed, exposes the adhesive boundary or the adhesive skin contact layer.

[0048] The adhesive boundary may include an adhesive skin contact layer. The adhesive skin contact layer may have an outer peripheral shape. The outer peripheral edge of the adhesive skin contact layer may have the same shape as the covering layer. The adhesive skin contact layer may have a window (or window portion). The window portion may be smaller in size than the absorbent pad. The window portion may have the same shape as the absorbent pad. The adhesive skin contact layer may include the wound-facing surface. The adhesive skin contact layer may include the wound-facing surface and the opposite surface. The adhesive skin contact layer may include an inner region. The adhesive skin contact layer may include an outer region. The opposite surface in the inner region may be adhered to the absorbent pad. The opposite surface in the outer region may be adhered to the covering layer.

[0049] The outer periphery of the covering layer may define the shape of the wound dressing. The outer periphery of the covering layer may have a "T-shaped" edge. The covering layer may include a first extension. The covering layer may include a second extension. The short side of the first extension (of the covering layer) may abut against the long side of the second extension (of the covering layer).

[0050] Advantageously, by providing a T-shaped periphery to the coating layer, the coating material can be formed more easily over highly contoured areas, and instances (or frequency) of bulging of the coating layer, which can increase the risk of leakage when a pressure difference is applied to the coating material, are reduced.

[0051] The width of the first extension (measured along the shorter direction of the first portion) may be between 30 and 90% of the length of the second extension (measured along the longer direction of the second portion), preferably between 40 and 80%, more preferably between 50 and 70%, for example between 60 and 70%, for example between 64 and 68%, i.e., 66%.

[0052] The length of the first extension (measured along the longitudinal direction of the first portion) may be between 20% and 200% of the width of the second extension (measured along the short direction of the second portion), preferably between 30% and 150%, more preferably between 40% and 100%, for example between 40% and 70%, for example between 45% and 55%, i.e., 50%.

[0053] One or more layers, or each layer, may have the same external shape. One or more layers, or each layer, may have the same external shape as the wound dressing. One or more layers, or each layer, may be symmetrical with respect to the central axis.

[0054] Having the same shape as the outer shape of the layer means that they are geometrically similar, that is, they may have the same relative arrangement and proportions as the other two outer shapes, even if they are different in size. For example, the outer shape of the wound dressing may be uniformly enlarged relative to the outer shape of the absorbent pad.

[0055] The wound dressing may have a length between 120 and 320 mm, preferably between 170 and 270 mm, more preferably between 200 and 240 mm, for example between 210 and 230 mm, for example 220 mm. The wound dressing may have a width between 120 and 460 mm, preferably between 170 and 270 mm, more preferably between 200 and 240 mm, for example between 210 and 230 mm, for example 220 mm.

[0056] The absorbent pad may have a length between 80 and 240 mm, preferably between 120 and 200 mm, more preferably between 140 and 280 mm, for example between 150 and 170 mm, for example 160 mm.

[0057] The absorbent pad may have a maximum width between 80 and 360 mm, preferably between 120 and 280 mm, more preferably between 140 and 180 mm, for example between 150 and 170 mm, for example 160 mm.

[0058] The first extension may have a length between 60 and 140 mm, preferably between 80 and 120 mm, more preferably between 90 and 110 mm, for example between 95 and 105 mm, for example 100 mm.

[0059] The first extension may have a width of 40 to 80 mm, preferably 45 to 75 mm, more preferably 50 to 70 mm, for example 55 to 65 mm, or for example 60 mm, (if tapered in shape).

[0060] The second extension may have a length between 60 and 360 mm, preferably between 80 and 180 mm, more preferably between 90 and 140 mm, for example between 95 and 105 mm, for example 100 mm.

[0061] The second extension may have a width of 40 to 80 mm, preferably 45 to 75 mm, more preferably 50 to 70 mm, for example, between 55 and 65 mm, for example, 60 mm.

[0062] The notches or each notch may have a width between 10 and 60 mm, preferably between 20 and 55 mm, more preferably between 30 and 50 mm, for example between 35 and 45 mm, for example 40 mm.

[0063] The notches or each notch may have a depth of 2 to 20 mm, preferably 5 to 15 mm, more preferably 8 to 12 mm, for example, 10 mm.

[0064] The coating layer may have a length between 120 and 320 mm, preferably between 170 and 270 mm, more preferably between 200 and 240 mm, for example between 210 and 230 mm, for example 220 mm. The coating layer may have a width between 120 and 320 mm, preferably between 170 and 270 mm, more preferably between 200 and 240 mm, for example between 210 and 230 mm, for example 220 mm.

[0065] The adhesive skin contact layer may extend outward from the absorbent pad by at least 10 mm, at least 15 mm, at least 20 mm, at least 25 mm, at least 30 mm, at least 40 mm, or at least 50 mm.

[0066] The covering layer may extend outward from the absorbent pad by at least 10 mm, at least 15 mm, at least 20 mm, at least 25 mm, at least 30 mm, at least 40 mm, or at least 50 mm.

[0067] The adhesive skin contact layer may overlap the absorbent pad by at least 2 mm, at least 4 mm, at least 6 mm, at least 8 mm, at least 10 mm, at least 12 mm, at least 15 mm, or at least 20 mm.

[0068] The absorbent pad may be placed between the first portion of the adhesive skin contact layer and the covering layer. The second portion of the adhesive skin contact layer may be placed on the covering layer. The second portion of the adhesive skin contact layer may be placed on the wound-facing side of the covering layer. The adhesive skin contact layer may have a window portion. The window portion may be provided in the first portion of the adhesive skin contact layer.

[0069] The wound dressing may have a thickness between 1 mm and 20 mm, or between 2 mm and 10 mm, or, for example, between 3 mm and 7 mm.

[0070] The coating layer may have a thickness of 10 to 50 μm (microns), preferably between 20 and 40 μm, more preferably between 25 and 35 μm, for example, 30 μm.

[0071] The wound dressing may be configured for use with a non-atmospheric pressure source. The wound dressing may be configured for use in a pressure gradient wound healing system. The wound dressing may be configured for use in negative pressure wound healing. The wound dressing may be configured for use in positive pressure wound healing.

[0072] As used herein and throughout this specification, the term "pressure gradient wound treatment system" is intended to encompass a wound treatment system in which a pressure difference (either positive or negative pressure) is applied between the area covered by the wound dressing and the surrounding environment.

[0073] As used herein, negative pressure wound treatment is a treatment technique that uses a suction-type dressing to remove excessive exudate and promote the healing of acute or chronic wounds. A vacuum of -50 to -200 mmHg, or -75 to -150 mmHg, may be applied, and the normal negative pressure is usually -80 to -130 mmHg, -100 to -130 mmHg, or often about -125 mmHg is applied to the wound.

[0074] In positive pressure wound treatment, positive pressure is applied to the wound, which may include providing simultaneous suction and irrigation of the wound. Positive pressure wound treatment may be performed at a positive pressure of up to 50% atm. in the wound, usually a low positive pressure of up to 20% atm., and more commonly up to 10% atm. Positive pressure wound treatment is known and is referred to in U.S. Patent Publication US20180140755.

[0075] The (outer) coating layer of the dressing is provided as a barrier layer against bacteria and viruses (or a barrier layer), and preferably resists the intrusion of liquid and air while allowing the transmission of water vapor. In this way, the coating layer allows the escape of water vapor through the dressing while enabling the application of pressure (either positive or negative pressure) to the wound, thereby enhancing the overall fluid handling capacity of the dressing. The outer coating layer is, for example, at least 3,000 g / m per 24 hours 2 (gm -2 ) or, more preferably, measured by the method described in "Test Methods for Primary Wound Dressings - Part 2 - Water Vapor Transmission Rate of Permeable Film Dressings" (BS EN 13726-2 (2002)), 10,000 g / m per 24 hours 2 to 50,000 g / m 2The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0076] The wound dressing is preferably an integral dressing. That is, the dressing layer and the body of the wound dressing are provided as a single, complete article, and the user or healthcare professional does not need to assemble it at the site of use or before application. The wound dressing preferably includes an adhesive layer and preferably a removable release layer. The wound dressing may be provided in packaging. The packaging may form a sterile space in which the wound dressing is provided. The wound dressing may be integrally formed in packaging.

[0077] Providing wound dressings as a single, integrated dressing offers advantages over more common negative pressure wound dressing systems that use a separate filler (e.g., foam) for contact with the wound and a drape that covers the wound site and provides a seal for applying negative pressure. The integrated system is easier for the user or healthcare professional to apply because each layer is properly aligned and integrated.

[0078] Wound dressings may be provided as a kit. The kit may include at least one wound dressing and at least one sealing strip. The sealing strip may be shaped to fit at least a portion of the outer circumference of the wound dressing.

[0079] During use, the wound dressing may be connected to a negative pressure source, such as a pump.

[0080] The coating layer may have a quadrilateral periphery. In this application, quadrilateral is understood to mean any shape having four sides, especially regular quadrilateral shapes such as rectangles, squares, stadium shapes, and rhombuses, and more particularly rectangles and squares, and also includes these shapes with rounded corners, such as rectangles and squares with rounded corners.

[0081] Accordingly, a second embodiment of the present disclosure provides a pressure gradient wound dressing comprising an absorbent pad and a covering layer, wherein the absorbent pad has a shape comprising two extended portions arranged at angles to each other, and the covering layer overlaps the absorbent pad and has a quadrangular periphery.

[0082] For wound dressings having an absorbent pad including two extended portions arranged at angles to each other, it is advantageous to provide a dressing layer with a quadrilateral periphery because this allows healthcare professionals to modify a wide area of ​​the dressing layer without risking the integrity of the seal once the dressing is applied to the wound site. Furthermore, especially when the dressing layer is made of a thin film, for example, polyurethane with a thickness between 25 and 35 μm, e.g., 30 μm, the dressing layer can be easily cut, and overlapping two portions improves both the conformity to the contour and the sealing at that location.

[0083] The first and second extensions may be positioned at angles between 0 and 180° relative to each other, preferably between 30 and 150° relative to each other, more preferably between 45 and 135° relative to each other, for example between 60 and 120° relative to each other, for example between 75 and 105° relative to each other, for example at an angle of about 90° relative to each other, that is, the first and second extensions may be positioned perpendicular to each other.

[0084] By arranging the two extending portions at an angle to each other, the wound dressing can be applied to cover nonlinear wounds and also to wounds that extend along the contours of the body. Furthermore, the opening for applying a non-atmospheric pressure source can be positioned away from the wound site, thereby reducing the risk of irritation to the wound site by the airway supplying non-atmospheric pressure.

[0085] The wound dressing according to the second embodiment may include any of the features described above with respect to the first embodiment.

[0086] In some embodiments, a wound dressing according to a second embodiment may include features of the first embodiment of the present invention (i.e., a wound dressing according to a second embodiment of the invention may include an absorbent pad having a shape including at least one wing portion, wherein the short side of the first extension portion abuts against the long side of the second extension portion, and at least one wing portion extends between the long side of the first extension portion and the long side of the second extension portion).

[0087] However, naturally, a wound dressing according to a second aspect of the present invention may include any of the features described above in relation to the first aspect of the present invention, without including the features defined in relation to the first aspect of the present invention. (For example, an embodiment according to a second aspect of the present invention may include an absorbent pad as outlined in relation to the first aspect of the present invention, while not requiring the shape according to the first aspect of the present invention, which includes wings.)

[0088] A third aspect of the present invention provides a method for applying a wound dressing according to the first or second aspect to a wound site.

[0089] The wound dressing may include any feature of the first or second embodiment of the present invention.

[0090] The method may further include a step of removing the wound dressing from the sterile packaging. The method may further include a step of removing the release layer from the wound dressing. The method may further include a step of placing the central region of the wound dressing on the wound site. The method may further include a step of placing the first extended portion away from the wound site.

[0091] The method described above may further include the step of connecting the wound dressing to a negative pressure source.

[0092] A fourth aspect of the present disclosure provides a kit comprising at least one wound dressing according to the first or second aspect (including any feature thereof) and at least one of a port, a ventilation channel, or a non-atmospheric pressure source.

[0093] The ventilation channel may be formed integrally with the wound dressing.

[0094] A fifth aspect of the present disclosure provides a negative pressure wound healing (NPWT) system comprising at least one wound dressing according to the first or second aspect (including any feature thereof), connected to a pump.

[0095] Any feature or combination of features disclosed or claimed herein may be combined with any other feature or combination of features, as far as possible, whether expressly stated or not. [Brief explanation of the drawing]

[0096] To better understand the present invention, one or more embodiments of the present invention will be described below by reference only to the accompanying drawings: [Figure 1] Figure 1 shows a plan view of the wound dressing material relating to this disclosure. [Figure 2] Figure 2 shows a plan view of the wound dressing shown in Figure 1, viewed from the side opposite the wound. [Figure 3] Figure 3 shows a cross-sectional view of the wound dressing shown in Figure 1. [Figure 4] Figure 4 shows a perspective view of the wound dressing from Figure 1 applied to the heel. [Figure 5] Figure 5 shows a plan view of a further wound dressing according to this disclosure. [Figure 6] Figure 6 shows a cross-sectional view of the wound dressing shown in Figure 5. [Figure 7] Figure 7 shows a plan view of yet another wound dressing related to this disclosure. [Figure 8] Figure 8 shows a cross-sectional view of the wound dressing shown in Figure 7. [Figure 9] Figure 9 shows a plan view of yet another wound dressing according to this disclosure. [Figure 10] Figure 10 shows a plan view of the wound dressing shown in Figure 9, viewed from the side opposite the wound. [Figure 11] Figure 11 shows a cross-sectional view of the wound dressing shown in Figure 9. [Figure 12] Figure 12 shows a perspective view of the wound dressing from Figure 9 applied to the heel. [Figure 13] Figure 13 shows the test apparatus using the wound dressing shown in Figure 9. [Figure 14] Figure 14 shows a plan view of yet another wound dressing relating to this disclosure. [Figure 15] Figure 15 shows an exploded perspective view of the covering material shown in Figure 14. [Figure 16] Figure 16 shows a cross-sectional view of the wound dressing shown in Figure 14. Detailed description of the invention

[0097] The following detailed description includes numerous specific details to allow for a full understanding of the various embodiments and inventive concepts. However, those skilled in the art will understand that the present invention may be carried out without these specific details or with known equivalents thereof, that the present invention is not limited to the embodiments described, and that the present invention may be carried out in various alternative embodiments. They will also understand that known methods, procedures, components, and systems may not be described in detail.

[0098] Generally, a wound dressing can be understood as any covering applied to a wound to promote wound healing and protect it from further deterioration. A wound dressing will typically cover the wound and be kept in direct contact with it. A wound dressing will generally include a surface that is in contact with the wound and a back surface that faces outward from the wound and defines the exterior of the dressing.

[0099] The wound contact surface may be provided by a separate wound contact layer having specific properties to promote healing. The wound contact layer is typically a non-adhesive layer positioned to be in direct contact with the wound and may be designed to facilitate the removal of exudate, e.g., by wicking or absorption. The back of the dressing may include a separate dressing layer to provide the exterior and the aforementioned back of the dressing. The dressing layer may be configured to provide a sealed envelope to the wound, preventing unwanted contamination of the wound and allowing a pressure gradient to be applied to the wound, while optionally being permeable to allow the release of moisture to aid in the healing performance of the dressing and the wound.

[0100] The wound dressing may be attached to the wound site by any known attachment method, such as fastening with a bandage, using adhesive tape, or by other forms of mechanical restraints that hold the dressing in place. Furthermore, or alternatively, the dressing may include an adhesive skin contact layer provided on the dressing layer or on a portion of the wound contact layer to adhere the dressing to the wound site, as needed.

[0101] It will be understood that, in addition to the wound contact layer, the dressing may include many other types of layers. The dressing may include, for example, a covering layer for covering the wound, and may further include one or more layers from the group consisting of a wound contact layer, a fluid distribution layer, a wicking layer, an absorbent layer, a superabsorbent layer, a transport layer, a foam layer, a gauze layer, an adhesive skin contact layer, or an interlayer adhesive layer. When the wound dressing includes a covering layer and one or more other layers, the additional layers will be provided within a laminated structure in which the covering layer is provided as an outer layer that defines the outer surface of the dressing, which is usually adhered to the patient, in order to cover the wound and to provide an envelope that can accommodate the other layers inside. Each layer may be described in relation to the covering layer and the wound site. Thus, each layer positioned between the wound site and the covering layer may include a first surface facing inward and toward the wound site, and a second surface facing outward from the wound site and toward the covering layer.

[0102] The shapes of wound dressings described herein may be used for any type of wound dressing. The specific embodiments described below include, but are not limited to, a covering layer, a wound contact layer, and an adhesive skin contact layer, and in some examples, one or more of these layers may be omitted. For example, the wound dressing according to this disclosure may include only a covering layer. Such a covering layer may be used, for example, to cover a separate wound contact dressing. In other examples, the wound dressing may not include an adhesive layer and may be attached to the patient by secondary means such as the aforementioned fastening means.

[0103] The wound dressings described herein have generally similar shapes, but are designed to be suitable for multiple different types of wound sites. This improves the versatility of the wound dressings and reduces the specialized knowledge required for their application. By providing multi-site wound dressing shapes, the aim is to provide dressings that balance ease of use with improved performance in terms of application time and patient comfort in a wide variety of situations.

[0104] Figures 1 to 4 show wound dressings according to a first embodiment of the present disclosure. The wound dressings are considered suitable for attachment or adhesion to multiple different parts of the human body, particularly the heel or the chest (or breast).

[0105] Figure 1 shows a plan view of the wound dressing 1. The dressing 1 includes an absorbent pad 10. To aid in describing the shape of the dressing 1, a center line AA extending through the center along the main axis of the dressing is shown. The length of the dressing 1 is measured along the main axis, and the width of the dressing 10 is measured perpendicular to the main axis.

[0106] The absorbent pad 10 has an overall "T-shape," that is, it includes a first extended portion 11 and a second extended portion 12. The short side 11a of the first extended portion 11 abuts the second extended portion 12 perpendicularly at the midpoint of the first long side 12a.

[0107] A first wing portion 13 is provided, extending between the first long side 11c of the first extension portion 11 and the long side 12a of the second extension portion 12. The first wing portion 13 has a triangular shape (i.e., generally triangular), with two short sides that abut against the first long side 11c of the first extension portion 11 and the long side 12a of the second extension portion 12. The third side 13a has a concave curved contour. To aid in understanding the various shapes of the parts of the absorbent pad, dashed lines are provided to demarcate each part, and it will be understood that these lines do not represent any structure in the covering material.

[0108] Similarly, a second wing portion 14 is provided extending between the second long side 11d of the first extension portion 11 and the long side 12a of the second extension portion 12. The second wing portion 14 has a triangular shape, with two short sides that abut against the second long side 11d of the first extension portion 11 and the long side 12a of the second extension portion 12. The third side 14a has a concave curved contour.

[0109] A covering layer 30 is provided above the periphery of the absorbent pad 10 and extending outward from the periphery, and the covering layer has an outer periphery 31, which has a square shape with rounded corners. When the wound dressing 1 is applied, the covering layer 30 and the wound may define a wound dressing cavity in which the remaining layers of the dressing 1 are located. Therefore, the covering layer 30 defines the shape of the dressing. The region of the covering layer 30 between the outer periphery 31 and the periphery of the absorbent pad 10 may be called the boundary region 33.

[0110] The covering layer 30 of the covering material is provided as a barrier layer against bacteria and viruses, and preferably resists the intrusion of liquids and air while allowing the passage of water vapor. In this way, the covering layer 30 enhances the overall fluid handling capacity of the covering material by allowing moisture vapor to escape through the covering material while enabling the application of pressure (either positive or negative pressure) to the wound. The outer covering layer has a density of, for example, at least 3,000 g / m² per 24 hours. 2 Or, more preferably, 10,000 g / m² per 24 hours, as measured by the method described in "Test Methods for Primary Wound Dressings Part 2: Water Permeability of Permeable Film Dressings" (BS EN 13726-2 (2002)). 2 From 50,000 g / m 2 The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some preferred embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0111] An opening 35 is provided in the covering layer 30 to provide fluid communication between the wound dressing cavity and a non-atmospheric pressure source. The opening 35 is located on the centerline (AA) of the first extending portion 11 of the absorbent pad 10, distal to the interface between the first extending portion 11 and the second extending portion 12, at a position approximately 75% of the length of the first extending portion 11.

[0112] As shown in Figure 3, the absorbent pad may consist of multiple layers. These may be, in order from the wound (or the area surrounding the wound) toward the covering layer 30, an adhesive skin contact layer 20, a wound contact layer 21, a transfer layer 22, and a superabsorbent layer 23. In some embodiments, the wound contact layer 21, the transfer layer 22, and the superabsorbent layer 23 may be laminated together, meaning that each layer forms an integrated, highly absorbent, and highly retaining structure. Advantageously, this reduces or eliminates the need for additional members to maintain the structure, thereby reducing the bulk of the covering, improving flexibility, and further improving the suitability of the covering to a wound site with a contour.

[0113] The adhesive skin contact layer 20 may have an outer periphery shape with a window portion 20a in the center, and the outer edge 20b of the adhesive skin contact layer may be continuous with the outer periphery 31 of the covering layer 30. The window portion 20a is a through-hole in the adhesive skin contact layer and has the same shape as the absorbent pad, but is sized to be smaller than the absorbent pad 10. As a result, the adhesive skin contact layer 20 holds the absorbent pad 10 in a position between the adhesive skin contact layer 20 and the covering layer 30.

[0114] The adhesive skin contact layer 20 includes an upper surface 20c and a lower surface 20d. The lower surface 20d is in contact with the skin surface during use. During use, the lower surface 20d of the adhesive skin contact layer 20 is detachably adhered to the patient's skin surface (not shown) such that the wound site (not shown) is located within the window portion 20a. Thereafter, the adhesive skin contact layer 20 surrounds the wound site rather than directly contacting it. Thus, the adhesive skin contact layer 20 contacts only the intact skin around the wound. The upper surface 20c may face outward from the patient's body.

[0115] A removable cover or "release layer" (not shown) may be adhered to the lower surface 20d of the adhesive skin contact layer 20. The removable cover may include foldable grip sections and be removable from the lower surface 20d of the adhesive skin contact layer 20. Thus, when the removable cover is adhered to the adhesive skin contact layer 20, the removable cover protects the adhesive skin contact layer 20, while when the removable cover is removed from the lower surface 20d of the adhesive skin contact layer 20 for the use of the wound dressing 1, the lower surface 20d is exposed and the wound dressing 1 can be removably secured to the patient's skin.

[0116] The wound contact layer 21 may include a first surface 21a and a second surface 21b. During use, the first surface 21a may face inward towards the patient's body, and the second surface 21b may face outward towards the patient's body. The first surface 21a of the wound contact layer 21 may come into contact with the wound when the wound dressing 1 is adhered to the skin adjacent to the wound (i.e., during use). The first surface 21a of the wound contact layer 21 is substantially aligned with the window portion 20a of the adhesive skin contact layer 20. Therefore, during use, the first surface 21a comes into contact with the wound through the window portion 20a. The second surface 21b of the wound contact layer 21 may come into contact adjacent to the first surface 22a of the transfer layer 22 or the first surface 23a of the superabsorbent layer 23. In the embodiment described, the second surface 22b of the wound contact layer 22 comes into contact adjacent to the first surface 23a of the transfer layer 23.

[0117] The transfer layer 22 may include a first surface 22a and a second surface 22b. During use, the first surface 22a may face inward towards the patient's body, and the second surface 22b may face outward towards the patient's body. The first surface 22a of the transfer layer 22 may be in contact adjacent to the second surface 21b of the wound contact layer 21 or the second surface 23b of the superabsorbent layer 23. The second surface 22b of the transfer layer 22 may be in contact adjacent to the first surface 23a of the superabsorbent layer 23 or the first surface 30c of the covering layer 30. In the embodiment described, the first surface 22a of the transfer layer 22 is in contact adjacent to the second surface 21b of the wound contact layer, and the second surface 22b of the transfer layer 22 is in contact adjacent to the first surface 23a of the superabsorbent layer 23.

[0118] The superabsorbent layer 23 may include a first surface 23a and a second surface 23b. During use, the first surface 23a may face inward towards the patient's body, and the second surface 23b may face outward towards the patient's body. The first surface 23a of the superabsorbent layer 23 may be in contact adjacent to the second surface 21b of the wound contact layer 21 or the second surface 22b of the transfer layer 22. The second surface 23b of the superabsorbent layer 23 may be in contact adjacent to the first surface 22a of the transfer layer 22 or the first surface 30c of the lining layer 30. In the embodiment described, the first surface 23a of the superabsorbent layer 23 is in contact adjacent to the second surface 22b of the transfer layer 22, and the second surface 23b of the superabsorbent layer 23 is in contact adjacent to the first surface 30c of the lining layer 30.

[0119] The adhesive skin contact layer 20 may overlap the absorbent pad 10 radially (or radially). The adhesive skin contact layer 20 may include an inner portion 20' adjacent to and surrounding the window portion 20a, and an outer portion 20'' radially outward from the inner portion. The inner and outer portions of the first surface 20c of the adhesive skin contact layer 20 may contact and adhere to the patient's skin during use. The inner portion of the second surface 20d of the adhesive skin contact layer 20 may be adjacent to and in contact with a portion of the first surface 21a of the wound contact layer 21. The outer portion of the second surface 20b of the adhesive skin contact layer 20 may be adjacent to and joined to the periphery of the first surface 30c of the lining layer 30. Beneficially, this helps prevent leakage of wound exudate from the area of ​​the wound dressing, which would be unsanitary and cause discomfort to the user. Furthermore, this also helps maintain negative pressure at the wound site. Moreover, this helps maintain the structure of the dressing before use, meaning that the dressing is formed integrally as a "one-piece" dressing.

[0120] The outer portion of the second surface 20d of the adhesive skin contact layer 20 may be attached to the periphery of the first surface 30c of the lining layer 30 by heat lamination, adhesive, welding (or baffling), or sewing.

[0121] The outer portion of the second surface 20d of the adhesive skin contact layer 20 may extend radially outward by about 12 mm beyond the periphery of the absorption structure.

[0122] The central region 2 of the dressing 1 may generally be understood as referring to the area where the wound would be located during use, i.e., the area within the wound contact layer 21. In some embodiments, the central region 2 of the dressing may refer to a circular (or elliptical) region located at the interface between the first extension 10 and the second extension 11 of the absorbent pad 10, encompassing part or all of the wing portions 12, 13. However, it will be understood that each layer of the wound dressing in the central region 2 does not have a different composition from other parts of the same layer. By providing the wing portions 12, 13, the size of the central region 2 is significantly increased, and as shown in Figure 1, the circular central region 2' defined by the corners of the first and second extensions has a substantially smaller area than the circular central region 2 defined by the wing portions 12, 13. In fact, in this embodiment, the wing portions 12, 13 provide an increase of approximately 40% in the area of ​​the central region, while representing only a modest 4% increase in the surface area of ​​the absorbent pad 10. This allows wound dressing 1 to be used on larger wounds and / or reduces the precision required when applying the dressing to the wound site.

[0123] The wound dressing 1 is shaped to better conform to different areas of the patient's body that typically have a contour, but not necessarily, and / or areas where it is difficult to adhere the dressing. For example, these areas may include the shoulder, armpit, elbow, wrist, sacrum, hip, and especially the chest and heel.

[0124] In this embodiment, the wound dressing 1 has a length of 220 mm (measured between two opposing outer edges of the dressing layer 30) and a width of 220 mm (measured between two other opposing outer edges of the dressing layer).

[0125] In this embodiment, the first extension has a length of 100 mm and a width of 60 mm, and the second extension has a length of 160 mm and a width of 60 mm. Therefore, the length of the absorbent pad 10, which is composed of the length of the first extension and the width of the second extension, is 160 mm. The maximum width of the absorbent pad 10 is measured along the length of the second extension and is also 160 mm. The concave curved edges 13a and 14a of each wing portion 13 and 14 have a radius of curvature of 30 mm.

[0126] The convex corners of the absorbent pad 10, namely the two corners of the first extension 11 distal to the wing portions 12 and 14, and the four corners of the second extension, are rounded to a radius of 10 mm.

[0127] The absorbent pad 10 is positioned in the center of the wound dressing 1, but because the absorbent pad 10 and the dressing layer 30 have different shapes, the width of the boundary region 33 (measured orthogonally from the periphery of the absorbent pad 10 to the outer periphery 31 of the dressing layer 30) is not uniform. The minimum width of the boundary region 33 is observed at several points, namely near the second short side 11b of the first extension, and the two short sides 12c, 12d and the second long side 12b of the second extension 12. At these points, the boundary region has a width of 30 mm.

[0128] The inner region 20' of the adhesive skin contact layer 20 is 12 mm wide, which does not hinder the effectiveness of the absorbent pad 12 while providing sufficient retention force.

[0129] Naturally, the above teachings can also be applied to dressings of other sizes. For example, a dressing may be uniformly reduced in size for use on smaller wound sites, or uniformly enlarged for larger wound sites. Similarly, the dressing may be non-uniformly enlarged or reduced, thereby maintaining the T-shaped outline of the absorbent pad 10 while providing a more extended or wider dressing as needed to fit a particular wound site. Likewise, the width of the boundary area can also be varied, for example, between 10 mm and 50 mm, in which case a wider boundary area improves adhesion to the wound site and sealing of the wound dressing cavity.

[0130] Referring to Figure 4, when in use, the wound dressing 1 is applied to the wound site such that the central region 2 is positioned over the wound site and secured in place using the adhesive skin contact layer 20. In this embodiment, the dressing 1 is applied to a patient with a wound on the heel. The central region 2 is positioned over the wound, the distal ends 12c,12d of the second extension are folded to the side of the foot, and the wings 13,14 help the wound dressing 1 conform to this fold and provide an increased volume of the absorbent pad 10 near the wound, thereby providing improved fluid management at the wound site. The first extension 11 is folded around the heel and extends posteriorly to the ankle. The shape of the wound dressing 1 is suitable for folding as described above. When folded, the boundary region 33, particularly the outer portion of the wing sections 13 and 14, may bulge due to the increased amount of the covering layer 30 in that portion. However, the HCP allows for easy cutting of this portion without risking impairing the seal, thus assisting in the adaptation of the dressing to the wound site. In fact, a large amount of material helps to overlap the cut portion, thereby improving the seal. This effect is particularly pronounced in preferred embodiments in which the covering layer 30 and the adhesive skin contact layer 20 include a flexible film adhesive structure (e.g., a polyurethane film with a silicone adhesive) that is easily cut and responds well to overlapping.

[0131] Next, the ventilation channel 37 is attached to the opening 35, connecting the covering material 1 to a non-atmospheric pressure source 50 (e.g., a pump if configured for use in an NPWT). To further improve airtightness, a sealing strip (not shown) may be applied to the outer circumference of the covering material 1 to ensure no leakage occurs. Providing the opening 35 on the first extension 11 of the absorbent pad 10 is particularly advantageous for the user because the connection to the non-atmospheric pressure (e.g., the ventilation channel 37) is not located over the wound site. If the port is located over the wound site, external pressure is applied to the covering material, for example, when the user lies on or leans on it, and the raised nature of the port applies greater pressure to the port.

[0132] In other cases, particularly when the wound is linear, for example as a result of an incision, the wound dressing 1 may be positioned such that the second extending portion 12 extends along the wound, and in such cases as well, the wings again provide an increase in the volume of the absorbent pad near the wound site.

[0133] Referring to Figures 5 and 6, a wound dressing 101 according to a second embodiment of the present invention is shown. The wound dressing of the second embodiment has many similarities to the wound dressing 1 of the first embodiment, and similar features have the same reference numerals with the numerical value increased by 100. Compared with the wound dressing 1 of the first embodiment, the wound dressing 101 of the second embodiment provides improved efficiency with respect to non-atmospheric pressure application.

[0134] Figure 5 shows a plan view of the wound dressing 101. The dressing 101 includes an absorbent pad 110. To aid in describing the shape of the dressing 101, a center line BB extending from the center along the main axis of the dressing is shown. The length of the dressing 101 is measured along the main axis, and the width of the dressing 110 is measured perpendicular to the main axis.

[0135] The absorbent pad 110 has an overall "T-shape," that is, it includes a first extended portion 111 and a second extended portion 112. The short side 111a of the first extended portion 111 abuts perpendicularly to the second extended portion 112 at the midpoint of the first long side 112a.

[0136] A first wing portion 113 is provided, extending between the first long side 111c of the first extension portion 111 and the long side 112a of the second extension portion 112. The first wing portion 113 has a triangular shape, with two short sides that abut against the first long side 111c of the first extension portion 111 and the long side 112a of the second extension portion 112. The third side 113a has a concave curved contour.

[0137] Similarly, a second wing portion 114 is provided, extending between the second long side 111d of the first extension portion 111 and the long side 112a of the second extension portion 112. The first wing portion 113 has a triangular shape, with two short sides abutting the second long side 111d of the first extension portion 111 and the long side 112a of the second extension portion 112. The third side 114a has a concave curved contour. To aid in understanding the various parts of the absorbent pad, dashed lines are provided to demarcate each part, and it will be understood that these lines do not represent any structure in the covering material.

[0138] As will be discussed in more detail below, the wound dressing 101 will typically be positioned such that the second extension 112 of the absorbent pad, or the area at the interface between the first extension 111 and the second extension 112, is positioned over the wound. The distal end of the first extension 111 from the second extension 112 has a reduced role in extrudate control, and therefore it is beneficial to reduce the volume of this area, thereby improving the efficiency of non-atmospheric pressure supply. For this purpose, the first extension 111 tapers so as to decrease in width as it moves away from the interface with the second extension 112, and also has a rounded distal end 111b'.

[0139] The covering layer 130 is positioned above the periphery of the absorbent pad 110 and extends outward beyond the outer periphery, and the covering layer is provided with an outer periphery 131, which has a square shape with rounded corners. The covering layer 130 and the wound may define a wound dressing cavity in which the remaining layers of the dressing material 101 are provided. Thus, the covering layer 130 defines the shape of the dressing material. The region of the covering layer 130 between the outer periphery 131 and the periphery of the absorbent pad may be referred to as the boundary region 133.

[0140] The covering layer 130 of the covering material is provided as a barrier layer against bacteria and viruses, and preferably resists the intrusion of liquids and air while allowing the passage of water vapor. In this way, the covering layer 130 enhances the overall fluid handling capacity of the covering material by allowing moisture vapor to escape through the covering material while enabling the application of pressure (either positive or negative pressure) to the wound. The outer covering layer has a density of, for example, at least 3,000 g / m² per 24 hours. 2 Or, more preferably, 10,000 g / m² per 24 hours, as measured by the method described in "Test Methods for Primary Wound Dressings Part 2: Water Permeability of Permeable Film Dressings" (BS EN 13726-2 (2002)). 2 From 50,000 g / m 2 The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some preferred embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0141] An opening 135 is provided in the covering layer 130 to provide fluid communication between the wound dressing cavity and a non-atmospheric pressure source. The opening 135 is located on the centerline of the first extension 111 of the absorbent pad 110, distal to the interface between the first extension 111 and the second extension 112, at a position approximately 75% of the length of the first extension 111.

[0142] As in the first embodiment, the absorbent pad may consist of multiple layers. These may be, in order from the wound (or the area around the wound) toward the covering layer 130, an adhesive skin contact layer 120, a wound contact layer 121, a transfer layer 122, and a superabsorbent layer 123.

[0143] In some embodiments, the wound contact layer 121, the transfer layer 122, and the superabsorbent layer 123 may be laminated together, meaning that each layer forms an integrated, highly absorbent, and highly retaining structure. Advantageously, this reduces or eliminates the need for additional members to maintain the structure, thereby reducing the bulk of the dressing, improving flexibility, and further enhancing the dressing's fit to contoured wound sites.

[0144] The adhesive skin contact layer 120 may have an outer periphery shape with a window portion 120a in the center, and the outer edge 120b of the adhesive skin contact layer may be continuous with the outer periphery 131 of the covering layer 130. The window portion 120a is a through-hole in the adhesive skin contact layer and has the same shape as the absorbent pad, but is set to be smaller in dimensions than the absorbent pad 110. As a result, the adhesive skin contact layer 120 holds the absorbent pad 110 in a position between the adhesive skin contact layer 120 and the covering layer 130.

[0145] The adhesive skin contact layer 120 includes an upper surface 120c and a lower surface 120d. The lower surface 120d is in contact with the skin surface during use. During use, the lower surface 120d of the adhesive skin contact layer 120 is detachably adhered to the patient's skin surface (not shown) such that the wound site (not shown) is located within the window portion 120a. Thereafter, the adhesive skin contact layer 120 surrounds the wound site rather than making direct contact with it. Thus, the adhesive skin contact layer 120 contacts only the intact skin around the wound. The upper surface 120b may face outward from the patient's body.

[0146] A removable cover or "release layer" (not shown) may be adhered to the lower surface 120d of the adhesive skin contact layer 120. The removable cover may include a foldable grip and is removable from the lower surface 120d of the adhesive skin contact layer 120. Thus, when the removable cover is adhered to the adhesive skin contact layer 120, the removable cover protects the adhesive skin contact layer 120, while when the removable cover is removed from the lower surface 120d of the adhesive skin contact layer 120 for the use of the wound dressing 101, the lower surface 120d is exposed, and the wound dressing 101 can be removably secured to the patient's skin.

[0147] The wound contact layer 21 may include a first surface 121a and a second surface 121b. During use, the first surface 121a may face inward towards the patient's body, and the second surface 121b may face outward towards the patient's body. The first surface 121a of the wound contact layer 121 may come into contact with the wound when the wound dressing 101 is adhered to the skin adjacent to the wound (i.e., during use). The first surface 121a of the wound contact layer 121 is substantially aligned with the window portion 120a of the adhesive skin contact layer 120. Therefore, during use, the first surface 121a comes into contact with the wound through the window portion 120a. The second surface 121b of the wound contact layer 121 may come into contact adjacent to the first surface 122a of the transfer layer 122 or the first surface 123a of the superabsorbent layer 123. In the embodiment described, the second surface 122b of the wound contact layer 122 is in contact with the first surface 123a of the transmission layer 123 adjacent to it.

[0148] The transfer layer 122 may include a first surface 122a and a second surface 122b. During use, the first surface 122a may face inward towards the patient's body, and the second surface 122b may face outward towards the patient's body. The first surface 122a of the transfer layer 122 may be in contact adjacent to the second surface 121b of the wound contact layer 121 or the second surface 123b of the superabsorbent layer 123. The second surface 122b of the transfer layer 122 may be in contact adjacent to the first surface 123a of the superabsorbent layer 123 or the first surface 130c of the covering layer 130. In the embodiment described, the first surface 122a of the transfer layer 122 is in contact adjacent to the second surface 121b of the wound contact layer, and the second surface 122b of the transfer layer 122 is in contact adjacent to the first surface 123a of the superabsorbent layer 123.

[0149] The superabsorbent layer 123 may include a first surface 123a and a second surface 123b. During use, the first surface 123a may face inward towards the patient's body, and the second surface 123b may face outward towards the patient's body. The first surface 123a of the superabsorbent layer 123 may be in contact adjacent to the second surface 121b of the wound contact layer 121 or the second surface 122b of the transfer layer 122. The second surface 123b of the superabsorbent layer 123 may be in contact adjacent to the first surface 122a of the transfer layer 122 or the first surface 130c of the lining layer 130. In the embodiment described, the first surface 123a of the superabsorbent layer 123 is in contact adjacent to the second surface 122b of the transfer layer 122, and the second surface 123b of the superabsorbent layer 123 is in contact adjacent to the first surface 130c of the lining layer 130.

[0150] The adhesive skin contact layer 120 may overlap the absorbent pad 110 in the radial direction. The adhesive skin contact layer 120 may include an inner portion 120' adjacent to and surrounding the window portion 120a, and an outer portion 120'' radially outward from the inner portion. The inner and outer portions of the first surface 120c of the adhesive skin contact layer 120 may contact and adhere to the patient's skin during use. The inner portion of the second surface 120d of the adhesive skin contact layer 120 may be adjacent to and in contact with a portion of the first surface 121a of the wound contact layer 121. The outer portion of the second surface 120b of the adhesive skin contact layer 120 may be attached adjacent to the periphery of the first surface 130c of the lining layer 130. Beneficially, this helps prevent leakage of wound exudate from the area of ​​the wound dressing, which would be unsanitary and cause discomfort to the user. Furthermore, this also helps maintain negative pressure at the wound site. Moreover, this maintains the structure of the dressing before use, which means that the dressing is formed integrally as a "one-piece" dressing.

[0151] The outer portion (or boundary region) of the second surface 120d of the adhesive skin contact layer 120 may be attached to the periphery of the first surface 130c of the lining layer 130 by heat lamination, adhesive, welding, or sewing.

[0152] The outer portion of the second surface 120d of the adhesive skin contact layer 120 may extend radially outward by about 12 mm beyond the periphery of the absorption structure.

[0153] The central region 102 of the dressing 101 may generally be understood as referring to the area where the wound would be located during use, i.e., within the area of ​​the wound contact layer 121. In some embodiments, the central region of the dressing may refer to a circular (or elliptical) region located at the interface between the first extension 110 and the second extension 111 of the absorbent pad 110, encompassing part or all of the wing portions 112, 113. However, it will be understood that each layer of the wound dressing in the central region 102 does not have a different composition from other parts of the same layer.

[0154] By providing the wing portions 112 and 113, the size of the central region 102 is significantly increased, and as shown in Figure 5, the circular central region 102' defined by the corners of the first and second extensions has a substantially smaller area than the circular central region 102 defined by the wing portions 112 and 113. In fact, in this embodiment, the wing portions 112 and 113 represent only a modest 4% increase in the surface area of ​​the absorbent pad 110, while providing an approximately 40% increase in the area of ​​the central region 102. This allows the wound dressing 101 to be used on larger wounds and / or reduces the precision required when applying the dressing to the wound site.

[0155] The wound dressing 101 is shaped to better conform to different areas of the patient's body that typically have a contour, but not necessarily, and / or areas where it is difficult to adhere the dressing. For example, these areas may include the shoulder, armpit, elbow, wrist, sacrum, hip, and especially the chest and heel.

[0156] In this embodiment, the wound dressing 1001 has a length of 220 mm (measured between two opposing outer perimeters of the dressing layer along line BB) and a width of 220 mm (measured between two other opposing outer perimeters of the dressing layer).

[0157] In this embodiment, the first extension has a length of 100 mm and a width of 60 mm, and the second extension has a length of 160 mm and a width that tapers from 60 mm near the wing portions 113, 114 to 50 mm near the opening 35. The length of the absorbent pad 110, which is composed of the length of the first extension and the width of the second extension, is 160 mm. The maximum width of the absorbent pad 110 is measured along the length of the second extension and is also 160 mm. The concave curved edges 113a, 114a of each wing portion 113, 114 have a radius of curvature of 30 mm.

[0158] The distal end 111c of the first extension 111 of the absorbent pad 110 is rounded to a radius of 25 mm, so that the distal end 111c terminates as a semicircular contour, thereby further reducing the volume of the first extension. The convex corner of the second extension is rounded to a radius of 10 mm.

[0159] The absorbent pad 110 is positioned in the center of the wound dressing 101, but because the absorbent pad 110 and the dressing layer 130 have different shapes, the width of the boundary region 133 (measured orthogonally from the periphery of the absorbent pad 110 to the outer periphery 131 of the dressing layer 130) is not uniform. The minimum width of the boundary region 133 is observed at several points, namely near the second short side 111b of the first extension, and the two short sides 112c, 112d and the second long side 112b of the second extension 112. At these points, the boundary region has a width of 30 mm.

[0160] The inner region 120' of the adhesive skin contact layer 120 is 12 mm wide, which does not hinder the effectiveness of the absorbent pad 112 while providing sufficient retention force.

[0161] Naturally, the above teachings can also be applied to dressings of other sizes. For example, a dressing may be uniformly reduced in size for use on smaller wound sites, or uniformly enlarged for larger wound sites. Similarly, a dressing may be non-uniformly enlarged or reduced, thereby maintaining the overall T-shaped outline of the absorbent pad 110 while providing a more extended or wider dressing as needed to fit a particular wound site. Likewise, the width of the boundary region can also be varied, for example, between 10 mm and 50 mm, in which case a wider boundary region improves adhesion to the wound site and sealing of the wound dressing cavity.

[0162] When used, the wound dressing 101 is applied to the wound site such that the central region 102 is positioned over the wound site and secured in place using the adhesive skin contact layer 120. The central region 102 is applied over the wound site and bent and / or curved to conform to the wound site. The wings 113, 114 help the wound dressing 101 achieve this conformity and provide an increased volume of the absorbent pad 110 near the wound, thereby providing improved fluid management at the wound site. The first extension 111 extends away from the wound. When the covering material 101 is folded or bent, the boundary region 133, particularly the outer portion of the wing portions 113 and 114, may bulge due to the increased amount of covering layer 130 in that portion. However, HCP allows this portion to be easily cut without risk of impairing the seal, in order to assist in the fitting of the covering material to the wound site. In fact, a large amount of material helps to overlap the cut portion, thereby improving the seal. This effect is particularly pronounced in preferred embodiments in which the covering layer 130 and the adhesive skin contact layer 120 include a flexible film adhesive structure (e.g., a polyurethane film with a silicone adhesive) that is easily cut and responds well to overlapping.

[0163] Next, the wound dressing 101 is attached via the ventilation channel 137 to a non-atmospheric pressure source (e.g., a pump if configured for use in an NPWT). To further improve airtightness, a sealing strip may be applied to the outer circumference of the dressing 101 to ensure no leakage occurs. Providing the opening 135 on the first extension 111 of the absorbent pad 110 is particularly advantageous because it is beneficial to the user in that the connection to the non-atmospheric pressure (i.e., the ventilation channel) is not located over the wound site. If the port is located over the wound site, external pressure applied to the dressing, for example, when a user lies on or leans on it, will result in greater pressure being applied to the port due to its protruding structure.

[0164] In a further example, particularly when the wound is linear, for example as a result of an incision, the wound dressing 101 may be positioned such that the second extension 112 extends along the wound, and in such an example as well, the wings 113, 114 again provide an increase in the volume of the absorbent pad 110 near the wound site.

[0165] Referring to Figures 7 and 8, a wound dressing 201 according to a third embodiment of the present invention is shown. The wound dressing of the third embodiment has many similarities to the wound dressings 1 of the first and second embodiments, and similar features are represented by the same reference numerals with the numerical values ​​increased by 200 and 100, respectively. Compared with the first and second embodiments, the wound dressing 201 of the third embodiment provides improved fit to wound sites with contours.

[0166] Figure 7 shows a plan view of the wound dressing 201. The dressing 201 includes an absorbent pad 210. To aid in describing the shape of the dressing 201, a center line CC extending through the center along the main axis of the dressing is shown. The length of the dressing 201 is measured along the main axis, and the width of the dressing 201 is measured perpendicular to the main axis.

[0167] The absorbent pad 210 has an overall "T-shape," that is, it includes a first extended portion 211 and a second extended portion 212. The short side 211a of the first extended portion 211 abuts the second extended portion 212 perpendicularly at the midpoint of the first long side 212a.

[0168] A first wing portion 213 is provided, extending between the first long side 211c of the first extension portion 211 and the long side 212a of the second extension portion 212. The first wing portion 213 has a triangular shape, with two short sides that abut against the first long side 211c of the first extension portion 211 and the long side 212a of the second extension portion 212. The third side 213a has a concave curved contour.

[0169] Similarly, a second wing portion 214 is provided, extending between the second long side 211d of the first extension portion 211 and the long side 212a of the second extension portion 212. The second wing portion 214 has a triangular shape, with two short sides that abut against the second long side 211d of the first extension portion 211 and the long side 212a of the second extension portion 212. The third side 214a has a concave curved contour.

[0170] To improve the fit of the dressing to the contour of the wound site, notches 240a and 240b are provided on the short sides 212c and 212d. Each notch 240a and 240b has a curved contour with a depth of one-quarter of the width of the notch.

[0171] The covering layer 230 is positioned above the periphery of the absorbent pad 210 and extends outward beyond the outer periphery, and the covering layer is provided with an outer periphery 231, which has a square shape with rounded corners. The covering layer 230 and the wound may define a wound dressing cavity in which the remaining layer of the dressing material 201 is provided. Thus, the covering layer 230 defines the shape of the dressing material. The region of the covering layer 230 between the outer periphery 231 and the periphery of the absorbent pad may be referred to as the boundary region 233.

[0172] The covering layer 230 of the covering material is provided as a barrier layer against bacteria and viruses, and preferably resists the intrusion of liquids and air while allowing the passage of water vapor. In this way, the covering layer 230 enhances the overall fluid handling capacity of the covering material by allowing moisture vapor to escape through the covering material while enabling the application of pressure (either positive or negative pressure) to the wound. The outer covering layer has a density of, for example, at least 3,000 g / m² per 24 hours. 2 Or, more preferably, 10,000 g / m² per 24 hours, as measured by the method described in "Test Methods for Primary Wound Dressings Part 2: Water Permeability of Permeable Film Dressings" (BS EN 13726-2 (2002)). 2 From 50,000 g / m 2The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some preferred embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0173] An opening 235 is provided in the covering layer 230 to provide fluid communication between the wound dressing cavity and a non-atmospheric pressure source. The opening 235 is located on the centerline of the first extension 211 of the absorbent pad 210, distal to the interface between the first extension 211 and the second extension 212, at a position approximately 75% of the length of the first extension 211.

[0174] As shown in Figure 8, the absorbent pad may consist of multiple layers. These may be, in order from the wound (or the area around the wound) toward the covering layer 230, an adhesive skin contact layer 220, a wound contact layer 221, a transfer layer 222, and a superabsorbent layer 223.

[0175] In some embodiments, the wound contact layer 221, the transfer layer 222, and the superabsorbent layer 223 may be laminated together, meaning that each layer forms an integrated, highly absorbent, and highly retaining structure. Advantageously, this reduces or eliminates the need for additional members to maintain the structure, thereby reducing the bulk of the dressing, improving flexibility, and further enhancing the dressing's fit to contoured wound sites.

[0176] The adhesive skin contact layer 220 may have an outer periphery shape with a window portion 220a in the center, and the outer edge 220b of the adhesive skin contact layer may be continuous with the outer periphery 231 of the covering layer 230. The window portion 220a is a through-hole in the adhesive skin contact layer and has the same shape as the absorbent pad, but is sized smaller than the absorbent pad 210. Thereafter, the adhesive skin contact layer 220 holds the absorbent pad 210 in a position between the adhesive skin contact layer 220 and the covering layer 230.

[0177] The adhesive skin contact layer 220 includes an upper surface 220c and a lower surface 220d. The lower surface 220d is in contact with the skin surface during use. During use, the lower surface 220d of the adhesive skin contact layer 220 is detachably adhered to the patient's skin surface (not shown) such that the wound site (not shown) is located within the window portion 220a. Thereafter, the adhesive skin contact layer 220 surrounds the wound site rather than making direct contact with it. Thus, the adhesive skin contact layer 220 contacts only the intact skin around the wound. The upper surface 220b may face outward from the patient's body.

[0178] A removable cover or "release layer" (not shown) may be adhered to the lower surface 220d of the adhesive skin contact layer 220. The removable cover may include a foldable grip and is removable from the lower surface 20d of the adhesive skin contact layer 220. Thus, when the removable cover is adhered to the adhesive skin contact layer 220, the removable cover protects the adhesive skin contact layer 220, while when the removable cover is removed from the lower surface 220d of the adhesive skin contact layer 220 for use of the wound dressing 1, the lower surface 220d is exposed, and the wound dressing 1 can be removably secured to the patient's skin.

[0179] The wound contact layer 221 may include a first surface 221a and a second surface 221b. During use, the first surface 221a may face inward towards the patient's body, and the second surface 221b may face outward towards the patient's body. The first surface 21a of the wound contact layer 221 may come into contact with the wound when the wound dressing 201 is adhered to the skin adjacent to the wound (i.e., during use). The first surface 221a of the wound contact layer 221 is substantially aligned with the window portion 220a of the adhesive skin contact layer 220. Therefore, during use, the first surface 221a comes into contact with the wound through the window portion 220a. The second surface 221b of the wound contact layer 221 may come into contact adjacent to the first surface 222a of the transfer layer 222 or the first surface 223a of the superabsorbent layer 223. In the embodiment described, the second surface 222b of the wound contact layer 222 is in contact adjacent to the first surface 223a of the transmission layer 223.

[0180] The transfer layer 222 may include a first surface 222a and a second surface 222b. During use, the first surface 222a may face inward towards the patient's body, and the second surface 222b may face outward towards the patient's body. The first surface 222a of the transfer layer 222 may be in contact adjacent to the second surface 221b of the wound contact layer 221 or the second surface 223b of the superabsorbent layer 223. The second surface 222b of the transfer layer 222 may be in contact adjacent to the first surface 223a of the superabsorbent layer 223 or the first surface 230c of the covering layer 230. In the embodiment described, the first surface 222a of the transfer layer 222 is in contact adjacent to the second surface 221b of the wound contact layer, and the second surface 222b of the transfer layer 222 is in contact adjacent to the first surface 223a of the superabsorbent layer 223.

[0181] The superabsorbent layer 223 may include a first surface 223a and a second surface 223b. During use, the first surface 223a may face inward towards the patient's body, and the second surface 223b may face outward towards the patient's body. The first surface 223a of the superabsorbent layer 223 may be in contact adjacent to the second surface 221b of the wound contact layer 221 or the second surface 222b of the transfer layer 222. The second surface 223b of the superabsorbent layer 223 may be in contact adjacent to the first surface 222a of the transfer layer 222 or the first surface 230c of the lining layer 230. In the embodiment described, the first surface 223a of the superabsorbent layer 223 is in contact adjacent to the second surface 222b of the transfer layer 222, and the second surface 223b of the superabsorbent layer 223 is in contact adjacent to the first surface 230c of the lining layer 230.

[0182] The adhesive skin contact layer 220 may overlap the absorbent pad 210 in the radial direction. The adhesive skin contact layer 220 may include an inner portion 220' adjacent to and surrounding the window portion 220a, and an outer portion 220'' radially outward from the inner portion. The inner and outer portions of the first surface 220c of the adhesive skin contact layer 220 may contact and adhere to the patient's skin during use. The inner portion of the second surface 220d of the adhesive skin contact layer 220 may be in contact adjacent to a portion of the first surface 221a of the wound contact layer 221. The outer portion of the second surface 220b of the adhesive skin contact layer 220 may be attached adjacent to the periphery of the first surface 230c of the lining layer 230. Beneficially, this helps prevent leakage of wound exudate from the area of ​​the wound dressing, which would be unsanitary and cause discomfort to the user. Furthermore, this also helps maintain negative pressure at the wound site. Moreover, this maintains the structure of the dressing before use, which means that the dressing is formed integrally as a "one-piece" dressing.

[0183] The outer portion of the second surface 220d of the adhesive skin contact layer 220 may be attached to the periphery of the first surface 230c of the lining layer 230 by heat lamination, adhesive, welding, or sewing.

[0184] The outer portion of the second surface 220d of the adhesive skin contact layer 220 may extend radially outward by about 12 mm beyond the periphery of the absorption structure.

[0185] The central region 202 of the dressing 201 may generally be understood as referring to the area where the wound would be located during use, i.e., the area within the wound contact layer 221. In some embodiments, the central region of the dressing may refer to a circular (or elliptical) region located at the interface between the first extension 210 and the second extension 211 of the absorbent pad 210, encompassing part or all of the wing portions 212, 213. However, it will be understood that each layer of the wound dressing in the central region 202 does not have a different composition from other parts of the same layer.

[0186] By providing the wing portions 212 and 213, the size of the central region 2 is significantly increased, and as shown in Figure 7, the circular central region 202' defined by the corners of the first and second extensions has a substantially smaller area than the circular central region 202 defined by the wing portions 212 and 213. In fact, in this embodiment, the wing portions 212 and 213 represent only a 6% increase in the surface area of ​​the absorbent pad 210, while providing an approximately 40% increase in the area of ​​the central region. This allows the wound dressing 201 to be used on larger wounds and / or reduces the precision required when applying the dressing to the wound site.

[0187] The wound dressing 201 is shaped to better conform to different areas of the patient's body that typically have a contour, but not necessarily, and / or areas where it is difficult to adhere the dressing. For example, these areas may include the shoulder, armpit, elbow, wrist, sacrum, hip, and especially the chest and heel.

[0188] In this embodiment, the wound dressing 201 has a length of 220 mm (measured between two opposing outer perimeters of the dressing layer) and a width of 220 mm (measured between two other opposing outer perimeters of the dressing layer).

[0189] In this embodiment, the first extension has a length of 100 mm and a width of 60 mm, and the second extension has a length of 160 mm and a width of 60 mm. Therefore, the length of the absorbent pad 210, which is composed of the length of the first extension and the width of the second extension, is 160 mm. The maximum width of the absorbent pad 210 is measured along the length of the second extension and is 180 mm. The concave curved edges 213a and 214a of each wing portion 213 and 214 have a radius of curvature of 30 mm.

[0190] The convex corners of the absorbent pad 210, namely the two corners of the first extension 211 distal to the wing portions 213 and 214, and the four corners of the second extension 212, are rounded to a radius of 10 mm. The notches 240a and 240b on the second extension 212 have a depth of 10 mm and a width of 40 mm, and therefore, in this embodiment, the notches extend over the entire distance between the rounded corners at each end of the second extension 212.

[0191] The absorbent pad 210 is positioned in the center of the wound dressing 201, but because the absorbent pad 210 and the dressing layer 230 have different shapes, the width of the boundary region 233 (when measured orthogonally from the periphery of the absorbent pad 10 to the outer periphery 231 of the dressing layer 230) is not uniform. The minimum width of the boundary region 233 is observed near several points; near the second short side 211b of the first extension and the second long side 212b of the second extension 212, the width of the boundary region is 30 mm, and near the two short sides 212c and 212d of the second extension 212, the width of the boundary region is 20 mm.

[0192] The inner region 220' of the adhesive skin contact layer 220 has a width of 12 mm, which does not hinder the effectiveness of the absorbent pad 212 while providing sufficient retention force.

[0193] Naturally, the aforementioned teachings can also be applied to dressings of other sizes. For example, a dressing may be uniformly reduced in size for use on smaller wound sites, or uniformly enlarged for larger wound sites. Similarly, the dressing may be non-uniformly enlarged or reduced, thereby maintaining the overall T-shaped outline of the absorbent pad 210 while providing a more extended or wider dressing as needed to fit a particular wound site. Likewise, the width of the boundary region can also be varied, for example, between 10 mm and 50 mm, in which case a wider boundary region improves adhesion to the wound site and sealing of the wound dressing cavity.

[0194] When used, the wound dressing 201 is applied to the wound site such that the central region 202 is positioned over the wound site and secured in place using the adhesive skin contact layer 220. The central region 202 is applied over the wound site together with the distal ends 212c, 212d of the second extension, and the wings 213, 214 help to conform when the wound dressing 201 is folded or curved along the contour and provide an increased volume of the absorbent pad 210 near the wound, thereby providing improved fluid management at the wound site. The notches 240 further improve the dressing's ability to conform to the contour of the wound site, provide a preferred position for the dressing 201 to be folded, and reduce the possibility of bulging. The shape of the wound dressing 201 is suitable for folding as described above. When folded, the boundary region 233, particularly the outer portion of the wing sections 213 and 214, may bulge due to the increased amount of the covering layer 230 in that portion. However, the HCP allows for easy cutting of this portion without risking impairing the seal, thus assisting in the fitting of the dressing to the wound site. In fact, a large amount of material helps to overlap the cut portions, thereby improving the seal. This effect is particularly pronounced in preferred embodiments in which the covering layer 230 and the adhesive skin contact layer 220 include a flexible film adhesive structure (e.g., a polyurethane film with a silicone adhesive) that is easily cut and responds well to overlapping.

[0195] Next, the wound dressing 1 is attached via the ventilation channel 137 to a non-atmospheric pressure source (e.g., a pump if configured for use in an NPWT). To further improve airtightness, a sealing strip (not shown) may be applied to the outer circumference of the dressing 201 to ensure that no leakage occurs. Providing an opening 235 on the first extension 211 of the absorbent pad 210 is particularly advantageous because it is beneficial to the user in that the connection to the non-atmospheric pressure (e.g., the ventilation channel) is not located over the wound site. If the port is located over the wound site, external pressure applied to the dressing, for example, when a user lies on or leans on it, will result in greater pressure being applied to the port due to its protruding structure.

[0196] In other examples, particularly when the wound is linear, for example as a result of an incision, the wound dressing 201 may be positioned such that the second extending portion 212 extends along the wound, and in such examples as well, the wings 213, 214 again provide an increase in the volume of the absorbent pad near the wound site.

[0197] Figures 9-12 show a wound dressing 301 according to a fourth embodiment of the present disclosure. The wound dressing is considered suitable for attachment or adhesion to multiple different parts of the human body, particularly the heel or chest.

[0198] The wound dressing 301 of the fourth embodiment has many similarities to the wound dressing 1 of the first embodiment, the wound dressing 101 of the second embodiment, and the wound dressing 201 of the third embodiment. Similar features have the same reference numerals, with the numerical values ​​added by 300, 200, and 100, respectively. Compared to the above embodiments, the wound dressing 301 of the fourth embodiment combines the features of the second and third embodiments.

[0199] Figure 10 shows a plan view of the wound dressing 301. The dressing 301 includes an absorbent pad 310. To aid in describing the shape of the dressing 301, a center line DD extending from the center along the main axis of the dressing is shown. The length of the dressing 301 is measured along the main axis, and the width of the dressing 310 is measured perpendicular to the main axis.

[0200] The absorbent pad 310 has an overall "T-shape," that is, it includes a first extended portion 311 and a second extended portion 312. The short side 311a of the first extended portion 311 abuts perpendicularly to the second extended portion 312 at the midpoint of the first long side 312a.

[0201] A first wing portion 313 is provided, extending between the first long side 311c of the first extension portion 311 and the long side 312a of the second extension portion 312. The first wing portion 313 has a triangular shape, with two short sides that abut against the first long side 311c of the first extension portion 311 and the long side 312a of the second extension portion 312. The third side 313a has a concave curved contour.

[0202] Similarly, a second wing portion 314 is provided, extending between the second long side 311d of the first extension portion 311 and the long side 312a of the second extension portion 312. The first wing portion 313 has a triangular shape, with two short sides that abut against the second long side 311d of the first extension portion 311 and the long side 312a of the second extension portion 312. The third side 414a has a concave curved contour.

[0203] To improve the fit of the dressing to the contour of the wound site, notches 340a and 340b are provided on the short sides 312c and 312d. Each notch 340a and 340b has a curved contour with a depth of one-quarter of the width of the notch.

[0204] The wound dressing 301 will typically be positioned such that the second extension 312 of the absorbent pad, or the area at the interface between the first extension 311 and the second extension 312, is positioned over the wound. The distal end of the first extension 311 from the second extension 312 has a reduced role in extrusion control, and therefore it is beneficial to reduce the volume of this area, thereby improving the efficiency of non-atmospheric pressure supply. For this purpose, the first extension 311 tapers so that its width decreases as it moves away from the interface with the second extension 312, and its distal end 331b' is rounded.

[0205] The covering layer 330 is positioned above the periphery of the absorbent pad 310 and extends outward from the periphery, and the covering layer is provided with an outer periphery 331, which has a square shape with rounded corners. The covering layer 330 and the wound may define a wound dressing cavity in which the remaining layer of the dressing material 301 is provided. Thus, the covering layer 330 defines the shape of the dressing material. Of the covering layer 330, the region between the outer periphery 331 and the periphery of the absorbent pad may be referred to as the boundary region 333.

[0206] The covering layer 330 of the covering material is provided as a barrier layer against bacteria and viruses, and preferably resists the intrusion of liquids and air while allowing the passage of water vapor. In this way, the covering layer 330 enhances the overall fluid handling capacity of the covering material by allowing moisture vapor to escape through the covering material while enabling the application of pressure (either positive or negative pressure) to the wound. The outer covering layer has a density of, for example, at least 3,000 g / m² per 24 hours. 2 Or, more preferably, 10,000 g / m² per 24 hours, as measured by the method described in "Test Methods for Primary Wound Dressings Part 2: Water Permeability of Permeable Film Dressings" (BS EN 13726-2 (2002)). 2 From 50,000 g / m 2 The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some preferred embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0207] An opening 335 is provided in the covering layer 330 to provide fluid communication between the wound dressing cavity and a non-atmospheric pressure source. The opening 335 is located on the centerline of the first extension 311 of the absorbent pad 310, distal to the interface between the first extension 311 and the second extension 312, at a position approximately 75% of the length of the first extension 311.

[0208] As shown in Figure 11, the absorbent pad may be composed of multiple layers. These may be, in order from the wound (or the area around the wound) toward the covering layer 330, an adhesive skin contact layer 320, a wound contact layer 321, a transfer layer 322, and a superabsorbent layer 323.

[0209] In some embodiments, the wound contact layer 321, the transfer layer 322, and the superabsorbent layer 323 may be laminated together, meaning that each layer forms an integrated, highly absorbent, and highly retaining structure. Advantageously, this reduces or eliminates the need for additional members to maintain the structure, thereby reducing the bulk of the dressing, improving flexibility, and further enhancing the dressing's fit to contoured wound sites.

[0210] As shown in Figure 10, the adhesive skin contact layer 320 may have an outer peripheral shape with a window portion 320a in the center, and the outer peripheral edge 320b of the adhesive skin contact layer may be continuous with the outer peripheral 331 of the covering layer 330. The window portion 320a is a through-hole in the adhesive skin contact layer and has the same shape as the absorbent pad, but is dimensionally smaller than the absorbent pad 310. As a result, the adhesive skin contact layer 320 holds the absorbent pad 310 in a position between the adhesive skin contact layer 320 and the covering layer 330.

[0211] The adhesive skin contact layer 320 includes an upper surface 320c and a lower surface 320d. The lower surface 320d is in contact with the skin surface during use. During use, the lower surface 320d of the adhesive skin contact layer 320 is detachably adhered to the patient's skin surface (not shown) such that the wound site (not shown) is located within the window portion 320a. Thereafter, the adhesive skin contact layer 320 surrounds the wound site rather than making direct contact with it. Thus, the adhesive skin contact layer 320 contacts only the intact skin around the wound. The upper surface 320b may face outward from the patient's body.

[0212] A removable cover or "release layer" (not shown) may be adhered to the lower surface 320d of the adhesive skin contact layer 320. The removable cover may include a foldable grip and is removable from the lower surface 20d of the adhesive skin contact layer 320. Thus, when the removable cover is adhered to the adhesive skin contact layer 320, the removable cover protects the adhesive skin contact layer 320, while when the removable cover is removed from the lower surface 320d of the adhesive skin contact layer 320 for the use of the wound dressing 301, the lower surface 320d is exposed, and the wound dressing 301 can be removably secured to the patient's skin.

[0213] The wound contact layer 321 may include a first surface 321a and a second surface 321b. During use, the first surface 321a may face inward towards the patient's body, and the second surface 321b may face outward towards the patient's body. The first surface 321a of the wound contact layer 321 may come into contact with the wound when the wound dressing 301 is adhered to the skin adjacent to the wound (i.e., during use). The first surface 321a of the wound contact layer 304 is substantially aligned with the window portion 320a of the adhesive skin contact layer 320. Therefore, during use, the first surface 321a comes into contact with the wound through the window portion 320a. The second surface 321b of the wound contact layer 321 may come into contact adjacent to the first surface 322a of the transfer layer 322 or the first surface 323a of the superabsorbent layer 323. In the embodiment described, the second surface 322b of the wound contact layer 322 is in contact adjacent to the first surface 323a of the transmission layer 323.

[0214] The transfer layer 322 may include a first surface 322a and a second surface 322b. During use, the first surface 322a may face inward towards the patient's body, and the second surface 322b may face outward towards the patient's body. The first surface 322a of the transfer layer 322 may be in contact adjacent to the second surface 321b of the wound contact layer 321 or the second surface 323b of the superabsorbent layer 323. The second surface 322b of the transfer layer 322 may be in contact adjacent to the first surface 323a of the superabsorbent layer 323 or the first surface 330c of the covering layer 330. In the embodiment described, the first surface 322a of the transfer layer 322 is in contact adjacent to the second surface 321b of the wound contact layer, and the second surface 322b of the transfer layer 322 is in contact adjacent to the first surface 323a of the superabsorbent layer 323.

[0215] The superabsorbent layer 323 may include a first surface 323a and a second surface 323b. During use, the first surface 323a may face inward towards the patient's body, and the second surface 323b may face outward towards the patient's body. The first surface 323a of the superabsorbent layer 323 may be in contact adjacent to the second surface 321b of the wound contact layer 321 or the second surface 322b of the transfer layer 322. The second surface 323b of the superabsorbent layer 323 may be in contact adjacent to the first surface 322a of the transfer layer 322 or the first surface 330c of the lining layer 330. In the embodiment described, the first surface 323a of the superabsorbent layer 323 is in contact adjacent to the second surface 322b of the transfer layer 322, and the second surface 323b of the superabsorbent layer 323 is in contact adjacent to the first surface 330c of the lining layer 330.

[0216] The adhesive skin contact layer 320 may overlap the absorbent pad 310 in the radial direction. The adhesive skin contact layer 320 may include an inner portion 320' adjacent to and surrounding the window portion 320a, and an outer portion 320'' radially outward from the inner portion. The inner and outer portions of the first surface 20c of the adhesive skin contact layer 320 may contact and adhere to the patient's skin during use. The inner portion of the second surface 320d of the adhesive skin contact layer 320 may be in contact adjacent to a portion of the first surface 321a of the wound contact layer 321. The outer portion of the second surface 320b of the adhesive skin contact layer 320 may be attached adjacent to the periphery of the first surface 330c of the lining layer 330. Beneficially, this helps prevent leakage of wound exudate from the area of ​​the wound dressing, which would be unsanitary and cause discomfort to the user. Furthermore, this also helps maintain negative pressure at the wound site. Moreover, this maintains the structure of the dressing before use, which means that the dressing is formed integrally as a "one-piece" dressing.

[0217] The outer portion of the second surface 320d of the adhesive skin contact layer 320 may be attached to the periphery of the first surface 330c of the lining layer 330 by heat lamination, adhesive, welding, or sewing.

[0218] The outer portion of the second surface 320d of the adhesive skin contact layer 320 may extend radially outward by about 12 mm beyond the periphery of the absorption structure.

[0219] The central region 302 of the wound dressing 301 may generally be understood as referring to the area where the wound would be located during use, i.e., within the area of ​​the wound contact layer 321. In some embodiments, the central region of the wound dressing may refer to a circular (or elliptical) region located at the interface between the first extension 311 and the second extension 312 of the absorbent pad 310, encompassing part or all of the wing portions 313, 314. However, it will be understood that each layer of the wound dressing in the central region 302 does not have a different composition from other parts of the same layer.

[0220] By providing the wing portions 312 and 313, the size of the central region 302 is significantly increased, and as shown in Figure 9, the circular central region 302' defined by the corners of the first and second extensions has a substantially smaller area than the circular central region 302 defined by the wing portions 312 and 313. In fact, in this embodiment, the wing portions 312 and 313 represent only a 5% increase in the surface area of ​​the absorbent pad 310, while providing an approximately 40% increase in the area of ​​the central region. This allows the wound dressing 301 to be used on larger wounds and / or reduces the precision required when applying the dressing to the wound site.

[0221] The wound dressing 301 is shaped to better conform to different areas of the patient's body that typically have a contour, but not necessarily, and / or areas where it is difficult to adhere the dressing. For example, these areas may include the shoulder, armpit, elbow, wrist, sacrum, hip, and especially the chest and heel.

[0222] In this embodiment, the wound dressing 301 has a length of 235 mm (measured along line DD between two opposing outer perimeters of the dressing layer 330) and a width of 220 mm (measured between two other opposing outer perimeters of the dressing layer 330).

[0223] In this embodiment, the first extension 311 has a length of 120 mm and a width that tapers from 60 mm near the wing portions 113 and 114 to 50 mm near the opening 35. The second extension 312 has a length of 160 mm and a width of 60 mm. Therefore, the length of the absorbent pad 310, which is composed of the length of the first extension 311 and the width of the second extension 312, is 180 mm. The maximum width of the absorbent pad 310 is measured along the length of the second extension 312 and is 160 mm. The concave curved edges 313a and 314a of each wing portion 313 and 314 have a radius of curvature of 40 mm.

[0224] The distal end 311c of the first extension 311 of the absorbent pad 310 is rounded to a radius of 25 mm, so that the distal end 311c terminates as a semicircular contour, thereby further reducing the volume of the first extension. The convex corner of the second extension is rounded to a radius of 10 mm.

[0225] The convex corners of the absorbent pad 310, namely the two corners of the first extension 311 distal to the wing portions 312 and 314, and the four corners of the second extension, are rounded to a radius of 10 mm.

[0226] The notches 340a and 340b on the second extension 312 have a depth of 10 mm and a width of 40 mm, and therefore, in this embodiment, the notches extend over the entire distance between the rounded corners at each end of the second extension 312.

[0227] The absorbent pad 310 is positioned in the center of the wound dressing 301, but because the absorbent pad 310 and the dressing layer 330 have different shapes, the width of the boundary region 333 (when measured orthogonally from the periphery of the absorbent pad 310 to the outer periphery 331 of the dressing layer 330) is not uniform. The minimum width of the boundary region 333 is observed near several points; namely, near the rounded distal end 311c of the first extension 311, the boundary region has a width of 25 mm, and near the two short sides 312c, 312d and the second long side 312b of the second extension 312, the boundary region has a width of 30 mm.

[0228] The inner region 320' of the adhesive skin contact layer 320 is 12 mm wide, which does not hinder the effectiveness of the absorbent pad 312 while providing sufficient retention force.

[0229] Naturally, the aforementioned teachings can also be applied to dressings of other sizes. For example, a dressing may be uniformly reduced in size for use on smaller wound sites, or uniformly enlarged for larger wound sites. Similarly, the dressing may be non-uniformly enlarged or reduced, thereby maintaining the overall T-shaped outline of the absorbent pad 310 while providing a more extended or wider dressing as needed to fit a particular wound site. Likewise, the width of the boundary region can also be varied, for example, between 10 mm and 50 mm, in which case a wider boundary region improves adhesion to the wound site and sealing of the wound dressing cavity.

[0230] Referring to Figure 12, when in use, the wound dressing 301 is applied to the wound site such that the central region 302 is positioned over the wound site and secured in place using the adhesive skin contact layer 320. In this embodiment, the dressing 301 is applied to a patient with a wound on the heel. The central region 302 is positioned over the wound, the distal ends 312c, 312d of the second extension are folded to the side of the foot, and the wings 313, 314 help the wound dressing 301 conform to this fold and provide an increased volume of the absorbent pad 310 near the wound, thereby providing improved fluid management at the wound site. The notch 340 further improves the dressing's ability to conform to the contour of the wound site, provides a preferred position for the dressing 301 to fold, and reduces the possibility of bulging. This effect is particularly pronounced in preferred embodiments in which the coating layer 330 and the adhesive skin contact layer 320 include a flexible film adhesive structure (e.g., a polyurethane film having a silicone adhesive) that is easily cut and responds well to overlapping.

[0231] The first extension 311 is folded around the heel and extends posteriorly to the ankle. The shape of the wound dressing 301 is suitable for folding as described above. When folded, the boundary region 333, particularly the outer portions of the wings 313 and 314, may bulge due to the increased amount of dressing layer 330 in those portions. However, HCP can easily cut this portion without risking impairing the seal, in order to help fit the dressing to the wound site. In fact, a large amount of material helps to overlap the cut portions, thereby improving the seal.

[0232] Next, a non-atmospheric pressure source 350 (e.g., a pump if configured for use in an NPWT) is attached to the wound dressing via a vent 337 attached to the opening 335. To further improve airtightness, a sealing strip (not shown) may be applied to the outer circumference of the dressing 301 to ensure no leakage occurs. Providing the opening 335 on the first extension 311 of the absorbent pad 310 is particularly advantageous because it is beneficial to the user in that the connection to the non-atmospheric pressure (e.g., the vent 337) is not located over the wound site. If the port is located over the wound site, external pressure applied to the dressing, for example, when a user lies on or leans on it, will result in greater pressure being applied to the port due to its protruding structure.

[0233] In other examples, particularly when the wound is linear, for example as a result of an incision, the wound dressing 301 may be positioned such that the second extending portion 312 extends along the wound, and in such examples as well, the wings again provide an increase in the volume of the absorbent pad near the wound site.

[0234] Referring to Figure 13, the testing of the wound dressing 301 according to the fourth embodiment will be described. A test apparatus 1000 is provided, including a female torso model 1001 having a chest 1002. On the torso 1001, two fluid inlet ports 1004 are located adjacent to the lower edge 1003 of the chest 1002, and another fluid inlet port 1005 is provided below the chest 1002. These fluid inlet ports 1004, 1005 simulate a typical anchor-shaped incision in the chest. The fluid inlet ports 1004, 1005 are circular with a diameter of 1 mm and are fluidically connected to a fluid reservoir 1006 and a pump 1007. The reservoir 1006 contains a test fluid having an ionic composition equivalent to that of wound exudate, and the fluid is colored to help visualize the diffusion of the fluid within the wound dressing 301. Pump 1007 simulates exudate from the incision site by supplying a total of 1.1 ml / hr / cm³ of fluid to the fluid inlet port. 2 It is configured to supply.

[0235] The test apparatus further includes two pressure sensors 1008 on the torso 1001 directly below the chest 1002. As will be described in detail below, these are positioned to be covered by the distal ends 312c, 312d of the second extension of the absorbent pad 310 of the covering material 301.

[0236] The apparatus 1000 is designed to simulate an incision directly below the chest. In the test, a wound dressing 301 is placed on the apparatus, covering the fluid inlet ports 1004 and 1005, with a second extension 312 extending to the lower edge of the chest and a first extension 311 extending upwards. The dressing layer 330 is sealed against the torso.

[0237] Referring to Figure 12, the negative pressure supply source is connected to the covering material via opening 350, similar to the usage example described above. Once the covering material is applied, the pump is 1.1 ml / hr / cm². 2 The test fluid was supplied. Subsequently, the negative pressure (in mmHg) was recorded by a pressure sensor at 10-second intervals for 72 hours.

[0238] The pressure measured by pressure sensor 1008 was consistently maintained at -80 mmHg of the nominal pressure throughout the test, and the two sensors showed good agreement throughout.

[0239] This indicates that the covering material 301 was able to transmit negative pressure through the exudate from the opening to the distal ends 312c and 312d of the second extension 312.

[0240] Figures 14-16 show a wound dressing 401 according to a fifth embodiment of the present disclosure. The wound dressing is considered suitable for attachment or adhesion to multiple different parts of the human body, particularly the heel or chest.

[0241] The wound dressing 401 of the fifth embodiment has many similarities to the wound dressing 1 of the first embodiment, the wound dressing 101 of the second embodiment, the wound dressing 201 of the third embodiment, and especially the wound dressing 301 of the fourth embodiment, and the similar features have the same symbols obtained by adding 400, 300, 200, and 100 to the numerical values, respectively.

[0242] Figure 13 shows a plan view of the wound dressing 401. The dressing 401 includes an absorbent pad 410. To aid in describing the shape of the dressing 401, a center line EE extending from the center along the main axis of the dressing is shown. The length of the dressing 401 is measured along the main axis, and the width of the dressing 410 is measured perpendicular to the main axis.

[0243] The absorbent pad 410 has an overall "T-shape," that is, it includes a first extended portion 411 and a second extended portion 412. The short side 411a of the first extended portion 411 abuts the second extended portion 412 perpendicularly at the midpoint of the first long side 412a.

[0244] A first wing portion 413 is provided, extending between the first long side 411c of the first extension portion 411 and the long side 412a of the second extension portion 412. The first wing portion 413 has a triangular shape, with two short sides that abut against the first long side 411c of the first extension portion 411 and the long side 412a of the second extension portion 412. The third side 413a has a concave curved contour.

[0245] Similarly, a second wing portion 414 is provided, extending between the second long side 411d of the first extension portion 411 and the long side 412a of the second extension portion 412. The second wing portion 413 has a triangular shape, with two short sides that abut against the second long side 411d of the first extension portion 411 and the long side 412a of the second extension portion 412. The third side 414a has a concave curved contour.

[0246] To improve the fit of the dressing to the contour of the wound site, notches 440a and 440b are provided on the short sides 412c and 412d of the second extension. Each notch 440a and 440b has a curved contour with a depth of one-quarter of the width of the notch.

[0247] The wound dressing 401 will typically be positioned such that the second extension 412 of the absorbent pad, or the area at the interface between the first extension 411 and the second extension 412, is positioned over the wound. The distal end of the first extension 411 from the second extension 412 has a reduced role in extrusion control, and therefore it is beneficial to reduce the volume of this area, thereby improving the efficiency of non-atmospheric pressure supply. For this purpose, the first extension 411 tapers so that its width decreases as it moves away from the interface with the second extension 412, and the distal end 411c is rounded.

[0248] The coating layer 430 is positioned above the periphery of the absorbent pad 410 and extends outward from the periphery, and the coating layer is provided with an outer perimeter 431, which has a rounded corner and a "T-shape". The "T-shape" is defined by coating layer notches 432 on two corners of the coating layer, which are generally square (as seen, for example, in a fourth embodiment having an absorbent pad of a similar shape). The two notches 432 are perpendicular to the center line EE and are located on the two corners between the outer periphery 431a of the coating layer 430 and two sides 431b parallel to the center line EE, on the proximal side of the first extension 411. Each notch 432 extends from the parallel side 431b to one-sixth of the width of the coating layer 430 and from the perpendicular side 431a to one-third of the length of the coating layer 430.

[0249] The covering layer 430 and the wound may define a wound dressing cavity in which the remaining layers of the dressing material 401 are located. Thus, the covering layer 430 defines the overall shape of the dressing material 401. The region of the covering layer 430 between the outer periphery 431 and the periphery of the absorbent pad may be referred to as the boundary region 433.

[0250] The covering layer 430 of the covering material is provided as a barrier layer against bacteria and viruses, and preferably resists the intrusion of liquids and air while allowing the passage of water vapor. In this way, the covering layer 430 enhances the overall fluid handling capacity of the covering material by allowing moisture vapor to escape through the covering material while enabling the application of pressure (either positive or negative pressure) to the wound. The outer covering layer has a density of, for example, at least 3,000 g / m² per 24 hours. 2 Or, more preferably, 10,000 g / m² per 24 hours, as measured by the method described in "Test Methods for Primary Wound Dressings Part 2: Water Permeability of Permeable Film Dressings" (BS EN 13726-2 (2002)). 2 From 50,000 g / m 2 The layer has an MVTR in the range of up to . The coating layer may be any suitable material, and in some preferred embodiments, it may include polyurethane materials known to those skilled in the art. The coating layer may have a thickness between 25 μm and 35 μm, preferably 30 μm.

[0251] An opening 435 is provided in the covering layer 430 to provide fluid communication between the wound dressing cavity and a non-atmospheric pressure source. The opening 435 is located on the centerline of the first extension 411 of the absorbent pad 410, distal to the interface between the first extension 411 and the second extension 412, at a position approximately 80% of the length of the first extension 411.

[0252] As shown in Figures 14 and 15, the absorbent pad may be composed of multiple layers. These may be, in order from the wound (or the area around the wound) toward the covering layer 430, an adhesive skin contact layer, a wound contact layer 421, a transfer layer 422, and a superabsorbent layer 423.

[0253] In some embodiments, the absorbent pad 410 includes a wound contact layer 421, a transfer layer 422, and a superabsorbent layer 423, which may be laminated together, meaning that each layer forms an integrated, highly absorbent, and highly retaining structure. Advantageously, this reduces or eliminates the need for additional members to maintain the structure, thereby reducing the bulk of the dressing, improving flexibility, and further enhancing the dressing's fit to a contoured wound site.

[0254] As shown in Figure 15, the adhesive skin contact layer 420 may have an outer peripheral shape with a window portion 420a in the center, and the outer peripheral edge 420b of the adhesive skin contact layer may be continuous with the outer peripheral 431 of the covering layer 430. The window portion 420a is a through-hole in the adhesive skin contact layer and has the same shape as the absorbent pad 410, but is set to be smaller in dimensions than the absorbent pad 410. As a result, the adhesive skin contact layer 420 holds the absorbent pad 410 in a position between the adhesive skin contact layer 420 and the covering layer 430.

[0255] As shown in Figure 16, Figure 16 is a cross-sectional view of the dressing 401 along the center line EE, with each layer separated for ease of viewing, and the adhesive skin contact layer 420 includes an upper surface 420c and a lower surface 420d. The lower surface 420d is in contact with the skin surface during use. During use, the lower surface 420d of the adhesive skin contact layer 420 is detachably adhered to the patient's skin surface (not shown) such that the wound site (not shown) is located within the window portion 420a. Thereafter, the adhesive skin contact layer 420 surrounds the wound site rather than directly contacting it. Thus, the adhesive skin contact layer 420 is in contact only with the intact skin around the wound. The upper surface 420b may face outward from the patient's body.

[0256] A removable cover or "release layer" 425 may be adhered to the lower surface 420d of the adhesive skin contact layer 420. The removable cover 425 may include a foldable grip 426 and is removable from the lower surface 420d of the adhesive skin contact layer 420. Thus, when the removable cover is adhered to the adhesive skin contact layer 420, the removable cover protects the adhesive skin contact layer 420, while when the removable cover is removed from the lower surface 420d of the adhesive skin contact layer 420 for the use of the wound dressing 401, the lower surface 320d is exposed, and the wound dressing 401 can be removably secured to the patient's skin.

[0257] The wound contact layer 421 may include a first surface 421a and a second surface 421b. During use, the first surface 421a may face inward towards the patient's body, and the second surface 421b may face outward towards the patient's body. The first surface 421a of the wound contact layer 421 may come into contact with the wound when the wound dressing 401 is adhered to the skin adjacent to the wound (i.e., during use). The first surface 421a of the wound contact layer 404 is substantially aligned with the window portion 420a of the adhesive skin contact layer 420. Therefore, during use, the first surface 421a comes into contact with the wound through the window portion 420a. The second surface 421b of the wound contact layer 421 may come into contact adjacent to the first surface 422a of the transfer layer 422 or the first surface 423a of the superabsorbent layer 423. In the embodiment described, the second surface 422b of the wound contact layer 422 is in contact with the first surface 423a of the transmission layer 423 adjacent to it.

[0258] The transfer layer 422 may include a first surface 422a and a second surface 422b. During use, the first surface 422a may face inward towards the patient's body, and the second surface 422b may face outward towards the patient's body. The first surface 422a of the transfer layer 422 may be in contact adjacent to the second surface 421b of the wound contact layer 421 or the second surface 423b of the superabsorbent layer 423. The second surface 422b of the transfer layer 422 may be in contact adjacent to the first surface 423a of the superabsorbent layer 423 or the first surface 430c of the covering layer 430. In the embodiment described, the first surface 422a of the transfer layer 422 is in contact adjacent to the second surface 421b of the wound contact layer, and the second surface 422b of the transfer layer 422 is in contact adjacent to the first surface 423a of the superabsorbent layer 423.

[0259] The superabsorbent layer 423 may include a first surface 423a and a second surface 423b. During use, the first surface 423a may face inward towards the patient's body, and the second surface 423b may face outward towards the patient's body. The first surface 423a of the superabsorbent layer 423 may be in contact adjacent to the second surface 421b of the wound contact layer 421 or the second surface 422b of the transfer layer 422. The second surface 423b of the superabsorbent layer 423 may be in contact adjacent to the first surface 422a of the transfer layer 422 or the first surface 430c of the lining layer 430. In the embodiment described, the first surface 423a of the superabsorbent layer 423 is in contact adjacent to the second surface 422b of the transfer layer 422, and the second surface 423b of the superabsorbent layer 423 is in contact adjacent to the first surface 430c of the lining layer 430.

[0260] The adhesive skin contact layer 420 may overlap the absorbent pad 410 radially. The adhesive skin contact layer 420 may include an inner portion 420' adjacent to and surrounding the window portion 420a, and an outer portion 420'' radially outward from the inner portion. The inner and outer portions of the first surface 420c of the adhesive skin contact layer 420 may contact and adhere to the patient's skin during use. The inner portion of the second surface 420d of the adhesive skin contact layer 420 may be in contact adjacent to a portion of the first surface 421a of the wound contact layer 421. The outer portion of the second surface 420b may be attached adjacent to the periphery of the first surface 430c of the lining layer 430. Beneficially, this helps prevent leakage of wound exudate from the area of ​​the wound dressing 401, which would be unsanitary and cause discomfort to the user. Furthermore, this also helps maintain negative pressure at the wound site. Moreover, this maintains the structure of the dressing before use, which means that the dressing is formed as a single, integrated dressing.

[0261] The outer portion of the second surface 420d of the adhesive skin contact layer 420 may be attached to the periphery of the first surface 430c of the lining layer 430 by heat lamination, adhesive, welding, or sewing.

[0262] The outer portion of the second surface 420d of the adhesive skin contact layer 420 may extend radially outward by about 12 mm beyond the periphery of the absorption structure.

[0263] The central region 402 of the dressing 401 may generally be understood as referring to the area where the wound would be located during use, i.e., within the area of ​​the wound contact layer 421. In some embodiments, the central region of the dressing may refer to a circular (or elliptical) region located at the interface between the first extension 411 and the second extension 412 of the absorbent pad 410, encompassing part or all of the wing portions 413, 414. However, it will be understood that each layer of the wound dressing in the central region 402 does not have a different composition from other parts of the same layer.

[0264] By providing the wing portions 412 and 413, the size of the central region 402 is significantly increased, and as shown in Figure 13, the circular central region 402' defined by the corners of the first and second extensions has a substantially smaller area than the circular central region 402 defined by the wing portions 412 and 413. In fact, in this embodiment, the wing portions 412 and 413 represent only a 5% increase in the surface area of ​​the absorbent pad 410, while providing an approximately 40% increase in the area of ​​the central region. This allows the wound dressing 401 to be used on larger wounds and / or reduces the precision required when applying the dressing to the wound site.

[0265] The wound dressing 401 is shaped to better conform to different areas of the patient's body that typically have a contour, but not necessarily, and / or areas where it is difficult to adhere the dressing. For example, these areas may include the shoulder, armpit, elbow, wrist, sacrum, hip, and especially the chest and heel.

[0266] In this embodiment, the wound dressing 401 has a length of 270 mm (measured along line EE between two opposing outer perimeters of the dressing layer 430) and a width of 270 mm (measured between two other opposing outer perimeters of the dressing layer 330).

[0267] In this embodiment, the first extension 411 has a length of 130 mm and a width that tapers from 60 mm near the wing portions 413 and 414 to 50 mm near the opening 435. The second extension 412 has a length of 205 mm and a width of 70 mm. Therefore, the length of the absorbent pad 410, which is composed of the length of the first extension 411 and the width of the second extension 412, is 200 mm. The maximum width of the absorbent pad 410 is measured along the length of the second extension 412 and is 2050 mm. The concave curved edges 413a and 414a of each wing portion 413 and 414 have a radius of curvature of 25 mm.

[0268] The distal end 411c of the first extension 411 of the absorbent pad 410 is rounded to a radius of 25 mm, so that the distal end 411c terminates as a semicircular contour, thereby further reducing the volume of the first extension. The convex corner of the second extension 412 is rounded to a radius of 10 mm.

[0269] The convex corners of the absorbent pad 410, namely the two corners of the first extension 411 distal to the wing portions 412 and 414, and the four corners of the second extension, are rounded to a radius of 10 mm.

[0270] The notches 440a and 440b on the second extension 412 have a depth of 10 mm and a width of 50 mm, and therefore, in this embodiment, the notches extend over the entire distance between the rounded corners at each end of the second extension 412.

[0271] The absorbent pad 410 is positioned in the center of the wound dressing 401, but despite both the absorbent pad 410 and the dressing layer 430 being "T-shaped", the width of the boundary region 433 (measured orthogonally from the periphery of the absorbent pad 410 to the outer periphery 431 of the dressing layer 430) is not uniform. The minimum width of the boundary region 433 is observed near several points; namely, near the rounded distal end 411c of the first extension 411, the boundary region has a width of 25 mm, and near the two short sides and the second long side of the second extension 412, the boundary region has a width of 30 mm.

[0272] The coating layer notch 432 extends 90 mm from the outer periphery 431a of the coating layer 430 perpendicular to the center line EE, and 50 mm from the two sides 431b parallel to the center line EE.

[0273] The inner region 420' of the adhesive skin contact layer 420 is approximately 12 mm wide, which does not hinder the effectiveness of the absorbent pad 312 while providing sufficient retention force.

[0274] Naturally, the aforementioned teachings can also be applied to dressings of other sizes. For example, a dressing may be uniformly reduced in size for use on smaller wound sites, or uniformly enlarged for larger wound sites. Similarly, the dressing may be non-uniformly enlarged or reduced, thereby maintaining the overall T-shaped outline of the absorbent pad 410 while providing a more extended or wider dressing as needed to fit a particular wound site. Likewise, the width of the boundary region can also be varied, for example, between 10 mm and 50 mm, in which case a wider boundary region improves adhesion to the wound site and sealing of the wound dressing cavity.

[0275] When used, the wound dressing 401 is applied to the wound site such that the central region 402 is positioned over the wound site and secured in place using the adhesive skin contact layer 420. In this embodiment, as in the fourth embodiment, the dressing 401 is applied to a patient with a wound on the heel. The central region 402 is positioned over the wound, the distal ends 412c, 412d of the second extension are folded to the side of the foot, and the wings 413, 414 help the wound dressing 401 conform to this fold and provide an increased volume of the absorbent pad 410 near the wound, thereby providing improved fluid management at the wound site. The notches 440 further improve the dressing's ability to conform to the contour of the wound site, provide a preferred position for the dressing 401 to fold, and reduce the possibility of bulging. This effect is particularly pronounced in preferred embodiments in which the coating layer 430 and the adhesive skin contact layer 420 include a flexible film adhesive structure (e.g., a polyurethane film with a silicone adhesive) that is easily cuttable and responds well to overlapping. The presence of the coating layer notches 432 improves the ease of application of the coating material, eliminating (or reducing) the need to cut the coating layer during application, and streamlining the application. The boundary region 433 has a much (or still) larger width than conventional coating materials having a square or rectangular absorbent pad and coating layer, thereby providing improved sealing against the application of pressure differences.

[0276] The first extension portion 411 is bent around the heel and extends behind the ankle. The shape of the wound dressing 401 is suitable for being bent as described above. When bending, the boundary region 433, particularly the outer portions of the wing portions 313, 314, may bulge due to an increase in the amount of the coating layer 330 in that portion. However, by providing the coating layer notch 432, this bulging is reduced or prevented. When the bulging is only reduced by the coating layer notch 432, the HCP can easily cut the coating layer 430 without risking compromising the airtightness to assist the conformity of the dressing to the wound site. Also, in practice, a large amount of material serves to overlap the portion after cutting, thereby improving the airtightness.

[0277] Next, a non - atmospheric pressure source (e.g., a pump if configured for use with NPWT) is attached to the wound dressing via a vent passage 437 attached to the opening 435. To further improve the airtightness, a sealing strip (not shown) may be applied to the outer periphery of the dressing 401 to ensure no leakage occurs. Providing the opening 435 on the first extension portion 411 of the absorbent pad 410 is particularly advantageous because the non - atmospheric pressure connection (e.g., the vent passage 437) is not placed over the wound site, which is beneficial for the user. When a port is provided over the wound site, when an external pressure is applied to the dressing, for example, when the user lies or leans on it, a greater pressure is applied to the port due to its protruding structure.

[0278] In another example, particularly when the wound is linear, for example, as a result of an incision, the wound dressing 401 may be arranged such that the second extension portion 412 extends along the wound. Also in such an example, the wing portions again provide an increase in the volume of the absorbent pad in the vicinity of the wound site.

[0279] Embodiments are described above only as examples. Many variations (or modifications) are possible without departing from the scope of protection provided by the attached claims. In particular, while the present invention is described with reference to a T-shaped absorbent pad, those skilled in the art will understand that it can be similarly applied to other shapes, such as an L-shaped absorbent pad.

Claims

1. A pressure gradient type wound dressing, The wound contact material includes an absorbent pad having a shape that includes two extended portions and at least one wing portion. The shorter side of the first extension abuts against the longer side of the second extension. The at least one wing portion extends between the long side of the first extension and the long side of the second extension, and is a pressure gradient type wound dressing.

2. The pressure gradient type wound dressing according to claim 1, wherein the short side of the first extension portion abuts against the long side of the second extension portion at its end.

3. The pressure gradient type wound dressing according to claim 1, wherein the short side of the first extension portion abuts against the long side of the second extension portion at the midpoint of the second extension portion.

4. The wound dressing includes two wing portions, The first wing portion extends from the first long side of the first extension portion to the long side of the second extension portion. The pressure gradient type wound dressing according to claim 1 or 3, wherein the second wing portion extends from the second long side of the first extension portion to the long side of the second extension portion.

5. The pressure gradient type wound dressing according to any one of claims 1 to 4, wherein the end of the first extension distal to the second extension includes an opening for connecting the wound dressing to a non-atmospheric pressure source.

6. The pressure gradient type wound dressing according to any one of claims 1 to 5, wherein the first extended portion tapers as it moves away from the second extended portion.

7. The aforementioned wing portion or each wing portion has a triangular shape, A pressure gradient type wound dressing according to any one of claims 1 to 6, having a contour of a circular arc shape with one side concave.

8. The pressure gradient type wound dressing according to claim 7, wherein the concave arc shape has a radius of curvature of at least 20 mm.

9. The pressure gradient type wound dressing according to claim 7 or 8, wherein the concave arc shape has a radius of curvature of at least 30 mm.

10. The pressure gradient type wound dressing according to claim 7, wherein the concave arc shape has a radius of curvature of at least 20% of the width of one or both extended portions.

11. The pressure gradient type wound dressing according to claim 7, wherein the concave arc shape has a radius of curvature of at least 30% of the width of one or both extended portions.

12. The pressure gradient type wound dressing according to any one of claims 1 to 11, wherein the wing portion or each wing portion has an area of ​​at least 1% of the area of ​​the absorbent pad.

13. The pressure gradient type wound dressing according to any one of claims 1 to 12, wherein the wing portion or each wing portion has an area of ​​at least 1.2% of the area of ​​the absorbent pad.

14. The aforementioned wing section or each wing section shall be at least 1.5 cm ２ A pressure gradient type wound dressing according to any one of claims 1 to 13, having the area of ​​the above.

15. The aforementioned wing section or each wing section is at least 1.7 cm ２ A pressure gradient type wound dressing according to any one of claims 1 to 14, having an area of ​​the above.

16. The pressure gradient type wound dressing according to any one of claims 1 to 15, wherein each short side of the second extended portion of the absorbent pad includes a notch.

17. The pressure gradient type wound dressing according to claim 16, wherein the notches or each of the notches have a curved contour.

18. The wound dressing is a single-piece wound dressing, according to any one of claims 1 to 17.

19. A pressure gradient type wound dressing according to any one of claims 1 to 18, further comprising a covering layer and an adhesive skin contact layer.

20. The absorbent pad is placed between the first portion of the adhesive skin contact layer and the covering layer. The pressure gradient type wound dressing according to claim 19, wherein the second portion of the adhesive skin contact layer is disposed on the covering layer.

21. The aforementioned covering layer has a quadrilateral periphery, according to any one of claims 1 to 20, a pressure gradient type wound dressing.

22. The pressure gradient type wound dressing according to any one of claims 1 to 21, wherein the absorbent pad comprises a wound contact layer, a transmission layer, and a superabsorbent layer.

23. The pressure gradient type wound dressing according to claim 22, wherein at least two of the wound contact layer, the transmission layer, and the superabsorbent layer are laminated together.

24. The pressure gradient type wound dressing according to any one of claims 1 to 23, wherein the first extension, the second extension, and the at least one wing portion define the outer circumference of the absorbent pad. The aforementioned covering layer has a "T-shaped" periphery, according to any one of claims 1 to 23, a pressure gradient type wound dressing.

25. The coating layer includes a first extended portion and a second extended portion, The pressure gradient type wound dressing according to any one of claims 1 to 24, wherein the short side of the first extended portion of the covering layer abuts against the long side of the second extended portion of the covering layer.

26. A kit comprising at least one pressure gradient wound dressing according to any one of claims 1 to 25, and at least one of a port, a ventilation channel, and a non-atmospheric pressure source.

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