WOUND DRESSINGS

• US 20120078153A1
• Filed: 08/26/2011
• Published: 03/29/2012
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Prometheus Medical Ltd. (Response Plus Holding PJSC)
• Original Assignee: Prometheus Medical Ltd. (Response Plus Holding PJSC)
• Inventors: Andrews, Philip, Russell, Malcolm, Munro, Hugh Semple, Halstead, Robert, Preece, David
• Granted Patent: US 8,710,289 B2
• Time in Patent Office: Days
• US Class Current: 602/43
• CPC Class Codes: A61F 13/0213 the fluid retention member being a layer of hydrocolloid, gel forming material
• CPC Class Codes: A61F 13/0226 characterised by the support layer
• CPC Class Codes: A61F 13/023 wound covering film layers without a fluid retention layer
• CPC Class Codes: A61F 13/0253 characterized by the adhesive material
• CPC Class Codes: A61F 13/05 specially adapted for use with sub-pressure or over-pressure therapy, wound drainage or wound irrigation, e.g. for use with negative-pressure wound therapy [NPWT]
• CPC Class Codes: A61F 2013/00165 not touching the wound

Abstract

A dressing for covering a wound of a patient comprises a sheet member adapted to be adhered to the patient'"'"'s skin in use to provide an airtight seal around the wound, wherein the skin-adhesion is provided by a hydrogel layer 10 on the skin-facing face of the sheet member, wherein the sheet member defines in use a substantially enclosed space 5 above the wound, and wherein a plurality of mutually spaced-apart flutter valves formed by holes 5 in a thin film 13 overlying an upper face of a layer 12 of the sheet member permit one-way air, blood and/or other fluid flow communication from the space 5 above the wound to the exterior of the dressing.

Claims

1-21. -21. (canceled)

22. A dressing for covering a wound of a patient, comprising:

a sheet member adapted to be adhered to the patient'"'"'s skin in use to provide an airtight seal around the wound, wherein the sheet member is adapted to be spaced apart from the skin in the region of the wound to define in use a space above the wound, and

a plurality of mutually spaced-apart flutter valves permitting one-way air, blood and/or other fluid flow communication from the space above the wound to the exterior of the dressing.

23. The dressing according to claim 22, wherein the dressing, including the flutter valves, is formed from one or more sheet materials which are of sufficient flexibility that the whole dressing is skin-conformable and the sheet material has substantially no rigid parts.

24. The dressing according to claim 22, wherein the sheet member is a multilayer sheet member comprising a first layer nearest the patient'"'"'s skin in use and at least one additional layer overlying at least a portion of the first layer on the major face thereof directed away from the patient'"'"'s skin in use, and

wherein the first layer is skin-adhesive on the major face that is directed towards the patient'"'"'s skin in use, and an aperture is provided in the first layer, so that the first layer can surround the wound, but not adhere to it, when the first layer is positioned on the patient'"'"'s skin to surround the wound and adheres to the patient'"'"'s skin around the wound to provide an airtight seal to the skin around the wound.

25. The dressing according to claim 24, wherein the at least one additional layer comprises a film layer which overlies the wound encircling aperture above the major face of the first layer of the sheet member that is directed away from the skin in use, and extends radially outwardly to overlie a portion of the first layer of the sheet member around the aperture,

wherein the film layer is sealed to the first layer of the sheet member and is provided with a plurality of holes defining the mouths of the plurality of flutter valves of the dressing, and

wherein the flutter valves permit one-way air, blood and/or other fluid flow communication from the space above the wound to the exterior of the dressing.

26. The dressing according to claim 22, wherein the dressing has two or three flutter valves.

27. The dressing according to claim 22, wherein the dressing has four flutter valves.

28. The dressing according to claim 22, wherein the dressing has five flutter valves.

29. The dressing according to claim 22, wherein the sheet member includes skin-adhesive coating comprising one or more gels, hydrocolloids, pressure-sensitive adhesives or any combination thereof.

30. The dressing according to claim 29, wherein the skin-adhesive coating comprises a hydrogel.

31. The dressing according to claim 30, wherein the hydrogel comprises a hydrated polymer formed by polymerisation of one or more monomers selected from olefinically unsaturated aliphatic or aromatic vinyl sulphonic acids, vinyl sulphobetaines, acrylic and methacrylic sulphonic acid esters, 2-hydroxy-3-acryloxy propyl sulphonic acid, 2-hydroxy-3-methacryloxy propyl sulphonic acid and 2-acrylamido-2-methyl-propanesulphonic acid and salts thereof.

32. The dressing according to claim 22, further comprising a spacer device which comprises:

one or more outwardly extending projections which in use extend in the region of the flutter valves of the dressing and serve to space external objects away from the dressing to prevent the flutter valves from being pressed closed by the external objects, and

apertures being present through the projection(s) and/or between projections so that air, blood and other fluid can pass from a space above the flutter valves to the external atmosphere when the spacer is in place on the dressing, when an external object is laid over the dressing and spacer.

33. A spacer device for use with a dressing comprising a sheet member and a plurality of flutter valves, the spacer device being adapted to be stuck to the face of the dressing that is directed away from the patient'"'"'s skin in use, comprising:

one or more outwardly extending projections which in use extend in the region of the flutter valves of the dressing and serve to space external objects away from the dressing to prevent the flutter valves from being pressed closed by the external objects, and

apertures being present through the projection(s) and/or between projections so that air, blood and other fluid can pass from a space above the flutter valves to the external atmosphere when the spacer is in place on the dressing, when an external object is laid over the dressing and spacer.

34. A dressing for covering a wound of a patient, comprising:

a sheet member adapted to be adhered to the patient'"'"'s skin in use to provide an airtight seal around the wound, and

one or more valves permitting one-way air, blood and/or other fluid flow communication from a space above the wound to the exterior of the dressing,

wherein the dressing has a threshold valve-opening overpressure of less than about 2.2 cm H₂O.

35. The dressing according to claim 34, wherein the dressing has two, three, four or five valves.

36. The dressing according to claim 34, wherein the sheet member includes skin-adhesive coating comprising a hydrated polymer formed by polymerisation of one or more monomer selected from olefinically unsaturated aliphatic or aromatic vinyl sulphonic acids, vinyl sulphobetaines, acrylic and methacrylic sulphonic acid esters, 2-hydroxy-3-acryloxy propyl sulphonic acid, 2-hydroxy-3-methacryloxy propyl sulphonic acid, 2-acrylamido-2-methyl-propanesulphonic acid and salts thereof.

37. The dressing according to claim 34, further comprising a spacer device which comprises:

one or more outwardly extending projections which in use extend in the region of the flutter valves of the dressing and serve to space external objects away from the dressing to prevent the flutter valves from being pressed closed by the external objects, and

apertures being present through the projection(s) and/or between projections so that air, blood and other fluid can pass from a space above the flutter valves to the external atmosphere when the spacer is in place on the dressing, when an external object is laid over the dressing and spacer.

38. A dressing for covering a wound of a patient suffering from a penetrating chest wound, comprising:

a sheet member adapted to be adhered to the patient'"'"'s skin in use to provide an airtight seal around a space defined by the dressing over the wound, and

at least one valve permitting one-way air, blood and/or other fluid flow communication from the space above the wound to the exterior of the dressing,

wherein the sheet member is adapted to be adhered to the patient'"'"'s skin in use by being provided with a skin-adhesive coating comprising a hydrated polymer formed by polymerisation of one or more monomer selected from olefinically unsaturated aliphatic or aromatic vinyl sulphonic acids, vinyl sulphobetaines, acrylic and methacrylic sulphonic acid esters, 2-hydroxy-3-acryloxy propyl sulphonic acid, 2-hydroxy-3-methacryloxy propyl sulphonic acid, 2-acrylamido-2-methyl-propanesulphonic acid and salts thereof.

39. The dressing according to claim 38, wherein the dressing has two, three, four or five valves.

40. The dressing according to claim 38, further comprising a spacer device which comprises:

one or more outwardly extending projections which in use extend in the region of the flutter valves of the dressing and serve to space external objects away from the dressing to prevent the flutter valves from being pressed closed by the external objects, and

apertures being present through the projection(s) and/or between projections so that air, blood and other fluid can pass from a space above the flutter valves to the external atmosphere when the spacer is in place on the dressing, when an external object is laid over the dressing and spacer.