WOUND DRESSING

• US 20180133065A1
• Filed: 12/21/2017
• Published: 05/17/2018
• Est. Priority Date: 11/21/2007
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Hartwell, Edward Yerbury
• Granted Patent: US 10,555,839 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• CPC Class Codes: A61F 13/0206 with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
• CPC Class Codes: A61F 13/0209 comprising superabsorbent material
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0226 characterised by the support layer
• CPC Class Codes: A61F 13/025 having a special distribution arrangement of the adhesive
• 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 2013/00246 in a special way pervious to air or vapours
• CPC Class Codes: A61F 2013/0028 applying of mechanical pressure; passive massage
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61M 1/90 Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
• CPC Class Codes: A61M 1/912 Connectors between dressing and drainage tube
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/962 having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
• CPC Class Codes: A61M 27/00 Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202

Abstract

A method and apparatus are disclosed for dressing a wound. The apparatus comprises an absorbent layer for absorbing wound exudate, a liquid impermeable, gas permeable filter layer over the absorbent layer, a cover layer comprising at least one orifice and a first liquid and gas permeable transmission layer underlying the absorbent layer. The transmission layer is in fluid communication with the filter layer.

Claims

1-37. -37. (canceled)

38. A wound treatment apparatus, comprising:

a dressing comprising;

a cover layer, the cover layer comprising at least one opening;

a wound contact layer;

a first layer disposed in a space between the cover layer and the wound contact layer, wherein the first layer comprises a foam material;

an absorbent layer positioned in fluid communication between the first layer and the wound contact layer, wherein the absorbent layer is below the first layer, wherein the absorbent layer comprises a plurality of through holes;

a connector in fluid communication with the space for connecting the space to a source of negative pressure; and

a hydrophilic member in fluid communication with the absorbent layer that permits moisture vapor and gas through, the hydrophilic member positioned in fluid communication between the first layer and the connector, wherein the hydrophilic member covers the at least one opening in the cover layer.

39. The apparatus of claim 38, wherein the plurality of through holes in the absorbent layer are configured to provide fluid transmission paths through the absorbent layer.

40. The apparatus of claim 38, wherein the plurality of through holes in the absorbent layer are vertically extending through holes.

41. The apparatus of claim 38, further comprising a second layer disposed in the space, wherein the second layer is below the absorbent layer and above the wound contact layer.

42. The apparatus of claim 41, wherein the first layer and the second layer have a larger perimeter than the absorbent layer.

43. The apparatus of claim 41, wherein the second layer is made of a different material than the first layer.

44. The apparatus of claim 41, wherein the second layer comprises a porous, non-woven layer.

45. The apparatus of claim 41, wherein the second layer comprises a foam transmission layer.

46. The apparatus of claim 38, further comprising a source of negative pressure configured to apply negative pressure to the dressing through the connector.

47. The apparatus of claim 38, wherein the cover layer is secured to the wound contact layer.

48. The apparatus of claim 38, wherein the cover layer comprises a moisture vapor permeable material.

49. The apparatus of claim 38, wherein the absorbent layer comprises a superabsorber material that is adapted to absorb fluid.

50. The apparatus of claim 38, wherein the hydrophilic member is above the cover layer.

51. The apparatus of claim 38, wherein the hydrophilic member is below the cover layer.