WOUND CLEANSING APPARATUS IN-SITU

• US 20110054423A1
• Filed: 11/05/2010
• Published: 03/03/2011
• Est. Priority Date: 10/28/2003
• Status: Abandoned Application

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Hartwell, Edward Yerbury, Lee-Webb, Julian, Nicolini, Derek, Blott, Patrick Lewis, Greener, Bryan
• Application Number:
  US12/940,788
• Publication Number:
  US 20110054423A1
• Time in Patent Office: Days
• US Class Current: 604/319
• 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 13/0259 characterised by the release liner covering the skin adhering layer
• 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 2013/00357 implanted wound fillings or covers
• CPC Class Codes: A61M 1/75 Intermittent or pulsating suction A61M1/63, A61M1/772 take precedence
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463
• CPC Class Codes: A61M 1/772 operating alternately
• CPC Class Codes: A61M 1/81 Piston pumps, e.g. syringes
• CPC Class Codes: A61M 1/82 Membrane pumps, e.g. bulbs
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/916 specially adapted for deep wounds
• CPC Class Codes: A61M 1/92 with liquid supply means
• 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 2205/075 Bulb type
• CPC Class Codes: A61M 2205/106 reciprocating
• CPC Class Codes: A61M 2205/7518 bacterial
• CPC Class Codes: A61M 2205/8206 battery-operated
• 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
• CPC Class Codes: A61M 3/0216 : Pressure
• CPC Class Codes: A61M 3/022 : Volume; Flow rate
• CPC Class Codes: A61M 3/0229 : Devices operating in a closed circuit, i.e. recycling the irrigating fluid
• CPC Class Codes: A61M 35/30 : Gas therapy for therapeutic treatment of the skin
• CPC Class Codes: Y10T 29/49826 : Assembling or joining

Abstract

An apparatus for cleansing wounds, in which wound exudate is removed from a wound bed and selectively cleansed and returned to the wound. The cleansing means removes materials deleterious to wound healing, and the cleansed fluid, still containing materials that are beneficial in promoting wound healing, is returned to the wound bed. The associated wound dressing and cleansing means are conformable to the wound, and may have irrigant fluid circulated from a reservoir by a device for moving fluid through a flow path which passes through the dressing and a means for fluid cleansing and back to the dressing.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. A wound therapy device, comprising:

a backing layer to cover at least a portion of a wound site;

a chamber under the backing layer, wherein the chamber is configured to retain and store wound exudate from the wound site upon application of negative pressure;

an outlet for communicating with a vacuum source and for supplying negative pressure to the wound and to the chamber; and

a porous member configured to retain wound exudate in the chamber.

12. The wound therapy device of claim 11, wherein the backing layer forms a seal over the wound.

13. The wound therapy device of claim 11, wherein the backing layer is sufficiently rigid to resist deformation under pressure in any direction.

14. The wound therapy device of claim 11, wherein the backing layer material is chosen from polyolefins, polyethylenes, polypropylenes, vinyl acetates, polyvinyl alcohols, polysiloxanes, polyesters, polycarbonates, polyamides, polyurethanes, polystyrenes, copolymers thereof, and mixtures thereof.

15. The wound therapy device of claim 11, wherein the backing layer is flexible.

16. The wound therapy device of claim 11, further comprising at least one support for supporting and strengthening the backing layer.

17. The wound therapy device of claim 16, wherein the support comprises a flange.

18. The wound therapy device of claim 11, further comprising foam underneath the backing layer.

19. The wound therapy device of claim 11, wherein the porous member comprises a micropore filter.

20. The wound therapy device of claim 11, wherein the porous member comprises a polymeric membrane.

21. The wound therapy device of claim 11, wherein the porous member comprises a hydrophobic material selected from the group consisting of polyesters, polycarbonates, PTFE, polyamides, hydrophobic polyurethanes, and quartz and glass fibres.

22. The wound therapy device of claim 11, wherein the chamber comprises a porous filler.

23. The wound therapy device of claim 22, wherein the porous filler is selected from the group consisting of:

foams, gels, and solid particulates.

24. The wound therapy device of claim 11, wherein the chamber further comprises an inhibitor of microbial growth.

25. The wound therapy device of claim 11, wherein the outlet comprises a connector for connecting to a fluid moving device.

26. The wound therapy device of claim 11, wherein the outlet is coupled to a miniature pump.

27. The wound therapy device of claim 11, further comprising a bleed valve to relieve excess pressure.

28. The wound therapy device of claim 11, wherein the negative pressure is regulated by a control device.

29. The wound therapy device of claim 11, wherein the backing layer is constructed of plastic selected from the group consisting of:

polypropylene, polyurethane, polyethylene, polyesters, polyamides, polysiloxanes, and copolymers and mixtures thereof.

30. The wound therapy device of claim 11, further comprising a permeable film.

31. The wound therapy device of claim 30, wherein the permeable film is configured to contact the wound.

32. The wound therapy device of claim 30, wherein the permeable film is attached to the skin around the wound.

33. The wound therapy device of claim 30, wherein the permeable film comprises a high moisture vapor permeability material.

34. The wound therapy device of claim 11, wherein the backing layer is constructed from a high moisture vapor permeability material.