Vacuum wound therapy wound dressing with variable performance zones
AssigneeSmith & Nephew, Inc.
InventorRonald F. Vitaris
Life of this patent
Estimating the term…
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.
Claims12
A wound dressing for use with a negative pressure wound therapy apparatus, the wound dressing comprising:
- a cover layer comprising:
- a central zone comprising a moisture vapor permeable membrane devoid of any coating deterring the transmission of moisture through the membrane;
- and
- a peripheral zone positioned at a periphery of the cover layer, the peripheral zone comprising a first adhesive configured to form a seal with skin surrounding a wound;
- a filler configured to absorb wound exudate;
- an intermediate zone comprising a plurality of regions with a distinct shape and including a therapeutic material configured to provide a therapeutic effect to the wound, the intermediate zone further comprising a second adhesive configured to laterally stabilize the wound dressing when negative pressure is applied to the wound dressing, wherein the intermediate zone comprises a layer of material that is separate from the central zone and peripheral zone, and wherein the plurality of regions including the therapeutic material are arranged in the intermediate zone as a pattern;
- and
- a fluid flow passage configured to be in fluidic communication with the negative pressure wound therapy apparatus, the fluid flow passage configured to permit a one way flow of fluid away from the wound dressing when negative pressure is applied to the wound dressing;
- wherein the first adhesive is different from the second adhesive, and
- wherein the first adhesive comprises a high peal-strength adhesive and the second adhesive comprises a shear-resistant adhesive.
Dependencies are inferred from the claim text.