VACUUM WOUND THERAPY WOUND DRESSING WITH VARIABLE PERFORMANCE ZONES

• US 20090234306A1
• Filed: 03/13/2008
• Published: 09/17/2009
• Est. Priority Date: 03/13/2008
• Status: Abandoned Application

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Vitaris, Ronald F.
• Application Number:
  US12/047,910
• Publication Number:
  US 20090234306A1
• Time in Patent Office: Days
• US Class Current: 604/304
• 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 13/00068 specially adapted for application or removal of fluid, e.g. irrigation or drainage of wounds, under-pressure wound-therapy A61F13/0216 takes precedence; drainage appliances for wounds in general A61M27/00
• 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 13/0213 the fluid retention member being a layer of hydrocolloid, gel forming material
• CPC Class Codes: A61F 13/0216 the fluid handling member being non absorbent, e.g. for use with sub- or over-pressure therapy, wound drainage or wound irrigation systems
• 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 13/0243 characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
• 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 13/0256 characterized by the parametric properties of the adhesive
• 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 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00217 not adhering to the wound with wax A61F2013/00161
• CPC Class Codes: A61F 2013/00246 in a special way pervious to air or vapours
• CPC Class Codes: A61F 2013/00263 vapour permeability >500 g/m2/24h
• CPC Class Codes: A61F 2013/00285 medication confinement
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0054 for deep wounds
• CPC Class Codes: A61F 2013/00646 Medication patches, e.g. transcutaneous
• CPC Class Codes: A61F 2013/00804 : different adhesion of different adhesive layers plasters with a double adhesive layer A61F2013/00421; with cyano-acrylic adhesive A61F2013/00459; with adhesive connecting means A61F2013/00561; adhesives for plasters A61F2013/00655; with absorbent adhesives A61F2013/00757; with permeable adhesive layers A61F2013/00761; changing the adhesion force with strain value A61F2013/00838
• CPC Class Codes: A61F 2013/00855 : pervious to air or vapours wound bandages in a special way pervious to air or vapour A61F2013/00246
• CPC Class Codes: A61F 2013/00902 : containing means

Abstract

A dressing for an open wound includes a cover layer dimensioned for positioning relative to a wound bed. The cover layer permits an evacuation of the space around the wound bed such that a sub-atmospheric pressure may be established to stimulate healing and facilitate the removal of fluid from the wound. Multiple performance zones in the cover layer allow the wound dressing to remain in position through repeated cycles of evacuation without placing undue strain on the wound bed. An outer peripheral zone may include a high peal-strength adhesive while an intermediate zone may include a shear resistant adhesive. A central zone may be devoid of any coating to maximize moisture transmission through cover layer.

Claims

1. A cover layer for a wound dressing for use in vacuum wound therapy, the cover layer comprising:

a central zone defined by a portion of a moisture vapor permeable membrane devoid of any coating deterring the transmission of moisture through the membrane;

a peripheral zone substantially surrounding the central zone, the peripheral zone adapted to provide a seal around a perimeter of a wound bed; and

at least one intermediate zone at least partially disposed between the central zone and the peripheral zone, the at least one intermediate zone comprising a substance for imparting a therapeutic effect to the wound bed.

2. The cover layer according to claim 1, wherein the peripheral zone includes a high peal-strength adhesive.

3. The cover layer according to claim 1, wherein the at least one intermediate zone comprises a first intermediate zone including a shear-resistant adhesive

4. The cover layer according to claim 3, wherein the at least one intermediate zone further comprises a second intermediate zone including a medicament delivery coating.

5. The cover layer according to claim 3, wherein the at least one intermediate zone further comprises a second intermediate zone including a hydrogel.

6. The cover layer according to claim 3, wherein the at least one intermediate zone further comprises a second intermediate zone including at least one of an anti-infective agent, an antimicrobial, antibiotic, analgesic, healing factor, vitamins, growth factors, debridement agents, or nutrients.

7. The cover layer according to claim 1, wherein the moisture vapor permeable membrane extends to a periphery of the cover layer to constitute a backing layer, the peripheral zone defined by a layer of adhesive bonded to the backing layer.

8. The cover layer according to claim 1, wherein the peripheral zone and the at least one intermediate zone are arranged concentrically with respect to the central zone.

9. The cover layer according to claim 1, further comprising a port for permitting access to a vacuum reservoir defined under the cover layer for a vacuum tube.

10. A wound dressing apparatus for use in a vacuum wound therapy procedure, which comprises:

a contact layer adapted for positioning adjacent a wound bed;

an absorbent filler positioned adjacent the contact layer within the wound bed for collecting liquids exuding from the wound bed;

a cover layer positioned over the wound bed defining a vacuum reservoir there between and permitting access of a vacuum tube to the vacuum reservoir, the cover layer comprising a peripheral zone to provide a seal around the wound bed, at least one intermediate zone for imparting a therapeutic effect to the wound bed, and a central zone formed from a moisture vapor permeable membrane.

11. The wound dressing apparatus according to claim 10, wherein the contact layer is formed from a conical apertured film.

12. The wound dressing apparatus according to claim 10, wherein the absorbent filler material comprises polyolefin filaments arranged in a multi-strand bundle.

13. The wound dressing apparatus according to claim 10, further comprising a vacuum system in fluid communication with the vacuum reservoir.

14. The wound dressing apparatus according to claim 13, wherein the vacuum system includes a vacuum source, a collection canister and a one-way valve.