Wound dressing

1. A wound dressing for the treatment of a wound by applying negative pressure to the wound, the wound dressing comprising:

a wound contact layer comprising a plurality of perforations through the wound contact layer that allow for fluid to pass there through;

a porous layer above the wound contact layer;

a sealing material in communication with the porous layer, wherein the sealing material is gas impermeable;

an absorbent layer configured to form a reservoir for fluid removed from the wound;

a cover layer covering the absorbent layer, wherein the cover layer extends over the absorbent layer into an edge region that is secured to the wound contact layer; and

a pump positioned between the cover layer and the wound contact layer and within the absorbent layer, the pump separated from the porous layer by the sealing material, the pump configured to apply negative pressure to the wound and configured to draw fluid from the wound through the wound contact layer and the porous layer and into the absorbent layer.

2. The wound dressing of claim 1 , wherein gaseous components of the fluid collected and stored by the absorbent layer are exhausted through the cover layer.

3. The wound dressing of claim 1 , further comprising a filter layer which permits air to be exhausted from the wound dressing.

4. The wound dressing of claim 1 , wherein the cover layer comprises a high moisture vapor permeable material configured to allow moisture to transpire through the cover layer.

5. The wound dressing of claim 1 , wherein the wound contact layer comprises an upper surface and a lower surface, and further comprising an adhesive on the lower surface, wherein the adhesive is configured to adhere the wound contact layer to the wound.

6. The wound dressing of claim 1 , wherein the absorbent layer comprises a synthetic superabsorbing material.

7. The wound dressing of claim 1 , wherein the porous layer disposed over the wound contact layer is configured to distribute negative pressure, through the wound contact layer, equally over the entire portion of the wound site being treated.

8. The wound dressing of claim 1 , wherein the porous layer is provided directly over the plurality of perforations in the wound contact layer.

9. The wound dressing of claim 1 , wherein the porous layer comprises a reticulated material.

10. The wound dressing of claim 1 , wherein the porous layer comprises a non-woven material.

11. The wound dressing of claim 1 , wherein the porous layer comprises reticulated foam.

12. The wound dressing of claim 1 , further comprising an opening in the sealing material, wherein the pump is in communication with the porous layer through the opening in the sealing material.

13. The wound dressing of claim 1 , wherein the sealing material extends across the width of the wound dressing.

14. The wound dressing of claim 3 , wherein the filter layer comprises an odor trapping material.

15. The wound dressing of claim 3 , wherein the filter layer comprises a gas permeable and liquid impermeable material.

16. The wound dressing of claim 3 , wherein the cover layer comprising at least one hole and the filter layer is configured to cover the at least one hole in the cover layer, wherein air exhausted from the pump is configured to pass through the filter layer and the at least one hole in the cover layer.

17. The wound dressing of claim 3 , wherein the filter layer is configured to prevent pathogens from being exhausted from the wound dressing.

18. A wound dressing for the treatment of a wound by applying negative pressure to the wound, the wound dressing comprising:

a wound contact layer comprising a plurality of perforations through the wound contact layer that allow for fluid to pass there through;

a porous layer above the wound contact layer;

an absorbent layer configured to form a reservoir for fluid removed from the wound, wherein the absorbent layer is above the porous layer;

a cover layer covering the absorbent layer, wherein the cover layer extends over the absorbent layer into an edge region that is secured to the wound contact layer;

a pump positioned between the cover layer and the wound contact layer and within the absorbent layer, the pump configured to apply negative pressure to the wound and configured to draw fluid from the wound through the wound contact layer and the porous layer and into the absorbent layer; and

a filter layer which permits air to be exhausted from the wound dressing, wherein air exhausted from the pump is configured to pass through the filter layer while allowing liquid to be absorbed and retained within the wound dressing and while negative pressure is maintained by the wound dressing.

19. The wound dressing of claim 18 , wherein gaseous components of the fluid collected and stored by the absorbent layer are exhausted through the cover layer.

20. The wound dressing of claim 18 , wherein the cover layer comprises a high moisture vapor permeable material configured to allow moisture to transpire through the cover layer.

21. The wound dressing of claim 18 , wherein the cover layer comprises at least one hole and the filter layer is configured to cover the at least one hole in the cover layer, wherein air exhausted from the pump is configured to pass through the filter layer and the at least one hole in the cover layer.

22. The wound dressing of claim 18 , wherein the wound contact layer comprises an upper surface and a lower surface, and further comprising an adhesive on the lower surface, wherein the adhesive is configured to adhere the wound contact layer to the wound.

23. The wound dressing of claim 18 , wherein the filter layer comprises an odor trapping material.

24. The wound dressing of claim 18 , wherein the filter layer comprises a gas permeable and liquid impermeable material.

25. The wound dressing of claim 18 , wherein the filter layer is configured to prevent pathogens from being exhausted from the wound dressing.