Wound dressing and method of treatment

• US 9,877,872 B2
• Filed: 07/12/2012
• Issued: 01/30/2018
• Est. Priority Date: 07/14/2011
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Mumby, Ella Lynn, Lecomte, Hlne Anne
• Primary Examiner(s): Stephens, Jacqueline
• Application Number:
  US14/232,607
• Publication Number:
  US 20140249495A1
• Time in Patent Office: 2,028 Days
• CPC Class Codes: A61F 13/00055 Saturation indicators
• CPC Class Codes: A61F 13/00059 provided with visual effects, e.g. printed or colored
• 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 13/00987 Apparatus or processes for manufacturing non-adhesive dressings or bandages
• CPC Class Codes: A61F 13/01029 made of multiple layers
• CPC Class Codes: A61F 13/0203 with fluid retention members
• 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 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0223 characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution
• CPC Class Codes: A61F 13/0226 characterised by the support 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 2013/0028 applying of mechanical pressure; passive massage
• CPC Class Codes: A61F 2013/00846 with transparent or translucent part
• CPC Class Codes: A61F 2013/00876 vapour permeability >500 g/mg/24h
• 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 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/918 for multiple suction locations
• 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

Abstract

A wound dressing, a method of manufacturing a wound dressing, and a method of treating a patient are disclosed. The wound dressing may include an absorbent layer for absorbing wound exudate; and an obscuring element for at least partially obscuring a view of wound exudate absorbed by the absorbent layer in use.

Claims

1. A wound dressing for providing protection at a wound site, comprising:

a wound contact layer;

an absorbent layer for absorbing wound exudate, the absorbent layer positioned above the wound contact layer;

an obscuring element for at least partially obscuring a view of wound exudate absorbed by the absorbent layer in use, the obscuring element positioned above the absorbent layer, wherein the obscuring element is configured to yield a CIE L* value of 50 or more; and

a cover layer positioned above the obscuring element.

2. The wound dressing of claim 1, wherein the wound contact layer carries an adhesive portion on a lower surface thereof, the adhesive portion for forming a substantially fluid tight seal over the wound site.

3. The wound dressing of claim 1, further comprising an odor control element.

4. The wound dressing of claim 3, wherein the odor control element is dispersed within or adjacent the absorbent layer or the obscuring element.

5. The wound dressing of claim 3, wherein the odor control element comprises activated charcoal fibres dispersed in a layer of the wound dressing.

6. The wound dressing of claim 1, wherein the obscuring element comprises a shielding layer positioned above the absorbent layer, the shielding layer configured for spreading pressure applied to the wound dressing at a first area over a second area, wherein the second area is larger than the first area.

7. The wound dressing of claim 6, wherein the shielding layer increases the area over which a pressure applied to the dressing is transferred by 25% or more or the initial area of application.

8. The wound dressing of claim 6, wherein the shielding layer comprises two or more sub-layers, wherein a first sub-layer comprises through holes and a further sub-layer comprises through holes and the through holes of the first sub-layer are offset from the through holes of the further sub-layer.

9. The wound dressing of claim 1, further comprising a porous layer positioned between the wound contact layer and the absorbent layer, the porous layer configured to draw exudate away from the wound site.

10. The wound dressing of claim 9, wherein the dressing further comprises an odor control element, and the odor control element is provided as a layer sandwiched between the porous layer and the absorbent layer.

11. The wound dressing of claim 1, wherein the cover layer comprises a translucent film having a moisture vapour permeability of 500 g/m²/24 hours or more.

12. The wound dressing of claim 1, wherein the cover layer comprises a bacterial barrier.

13. The wound dressing of claim 1, wherein the obscuring element is provided over a central region of the absorbent layer and not over a border region of the absorbent layer.

14. The wound dressing of claim 1, wherein the obscuring element comprises, or is coated with, a material having size-exclusion properties for selectively permitting or preventing passage of molecules of a predetermined size or weight.

15. The wound dressing of claim 1, wherein the obscuring element comprises, or is coated with, a hydrophilic material.

16. The wound dressing of claim 1, wherein the obscuring element comprises a three-dimensional knitted spacer fabric.

17. The wound dressing of claim 1, wherein the obscuring element is partially translucent.

18. The wound dressing of claim 1, further comprising a region in or adjacent to the obscuring element for allowing viewing of the absorbent layer.

19. The wound dressing of claim 1, wherein the obscuring element comprises an indicator for indicating a need to change the dressing.

20. The wound dressing of claim 1, wherein the obscuring element comprises at least one opening for allowing passage of fluid therethrough.

21. The wound dressing of claim 1, wherein the obscuring element is configured to at least partially mask light radiation having wavelength of 600 nm and less.

22. The wound dressing of claim 1, wherein the obscuring element is configured to reduce light absorption by 50% or more.

23. The wound dressing of claim 1, wherein the obscuring element is configured to yield a CIE L* value of 70 or more.

24. The wound dressing of claim 1, wherein the cover layer is sealed to the wound contact layer around a perimeter of the wound dressing.

25. The wound dressing of claim 1, wherein the obscuring element and the absorbent layer are provided as a single layer.

26. The wound dressing of claim 1, wherein the dressing is shaped to include sub-areas.