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1. (WO2019027731) MULTI-LAYER COMPARTMENT DRESSING AND NEGATIVE-PRESSURE TREATMENT METHOD
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CLAIMS

What is claimed is:

1. A dressing for treating a tissue site, the dressing comprising:

a first layer being made from a liquid-impermeable material and being at least partially fenestrated;

a second layer being made from a liquid-impermeable material and being at least partially fenestrated, the second layer coupled to the first layer to define a chamber between the first layer and the second layer; and

a third layer disposed within the chamber, the third layer comprising a manifold having a central region and a perimeter region, the perimeter region containing perforations arranged in a pattern that defines a plurality of sub-regions of the perimeter region;

wherein the first layer and the second layer are coupled together by a plurality of welds or bonds through the perimeter region of the third layer comprising the manifold.

2. The dressing of claim 1, wherein the chamber further comprises a plurality of fluid removal pathways, substantially all of which flow through the manifold.

3. The dressing of claim 1 or claim 2, wherein the manifold is monolithic and wherein the plurality of welds or bonds extend through at least some of the perforations in the perimeter region.

4. The dressing of any of claims 1-3, wherein each of the plurality of sub-regions from the perimeter region is configured to be manually removable by a user.

5. The dressing of any of claims 1-4, wherein the first layer and the second layer are releasably coupled together near their outer edges.

6. The dressing of any of claims 1-5, wherein the first layer and the second layer are coupled together by a plurality of bonds to the perimeter region of the third layer comprising the manifold.

7. The dressing of claim 6, the coupling further comprising a low-tack adhesive bonding the first layer to the second layer.

8. The dressing of any of claims 1-7, wherein the third layer does not comprise, and the chamber does not contain, any manifolding elements extending outward from an outer edge of the perimeter region.

9. The dressing of any of claims 1-8, wherein the chamber comprises an effective amount of one or more of an antiseptic and an antimicrobial agent.

10. The dressing of any of claims 1-9, wherein the third layer further comprises an absorbent material adapted to reduce, inhibit, or eliminate granulation in vivo and adapted to absorb fluid.

11. The dressing of claim 10, wherein the absorbent material comprises a cross-linked hydrogel.

12. The dressing of any of claims 1-11, wherein the first layer and the second layer each comprise a polyurethane film.

13. The dressing of claim 12, wherein the first layer and the second layer each has a thickness of between 25 μπι and 500 μπι.

14. The dressing of any one of claims 1-13, further comprising:

a filler member disposed above the central region of the manifold; and

a cover disposed above the filler member and configured to form a seal with a tissue site.

15. The dressing of claim 14, wherein the cover comprises a polyurethane drape and an adherent layer adapted to sealably couple the polyurethane drape to the tissue site.

16. A dressing for treating a tissue site, the dressing comprising:

a first layer being made from a liquid-impermeable material and being at least partially fenestrated;

a second layer being made from a liquid-impermeable material and being at least partially fenestrated, the second layer coupled to the first layer to define a chamber between the first layer and the second layer; and

a third layer disposed within the chamber, the third layer comprising a manifold having a central region and a perimeter region, the perimeter region containing perforations arranged in a pattern that defines a plurality of sub-regions of the perimeter region;

wherein the manifold does not comprise, and the chamber does not contain, any manifolding elements extending outward from an outer edge of the perimeter region, and wherein the first layer and the second layer are coupled together by a plurality of welds or bonds through the perimeter region of the third layer comprising the manifold.

17. A system for treating a tissue site with negative pressure, the system comprising:

a dressing according to any of claims 1-16; and

a negative-pressure source fluidly coupled to a plurality of fluid removal pathways via the manifold.

18. The system of claim 17, further comprising:

a negative-pressure conduit; and

a negative-pressure connector subsystem for fluidly coupling the negative-pressure source to the plurality of fluid removal pathways via the manifold.

19. The system of claim 18, further comprising a container fluidly coupled to the negative-pressure source and the dressing and adapted to collect fluid.

20. The system of any of claims 17-19, further comprising:

a fluid source coupled to and in fluid communication with the dressing; and a plurality of fluid delivery pathways formed within the chamber and configured to be in fluid communication with the fluid source,

wherein the fluid delivery pathways are also in fluid communication with the fluid removal pathways via the manifold.

21. The system of claim 20, wherein the plurality of fluid delivery pathways comprise openings at peripheral ends or perforations along a length of each fluid delivery pathway.

22. The system of claim 21, wherein the plurality of fluid delivery pathways are disposed between the third layer and the first layer.

23. The system of claim 21, wherein the plurality of fluid delivery pathways are disposed on the first layer outside, but in fluid communication with, the chamber.

24. The system of any of claims 21-23, further comprising a fourth layer being made of a liquid-impermeable material and coupled to the first layer to provide a fluid delivery space, wherein the perforations along the length of the fluid delivery pathways are formed by apertures in the fourth layer or by apertures or fenestrations in the first layer.

25. The system of any of claims 20-24, further comprising a centrally-positioned hub in fluid communication with the plurality of fluid delivery pathways.

26 The system of any of claims 20-25, further comprising a central manifold configured for fluid delivery and configured to be a part of the plurality of fluid removal pathways, which central manifold is within the filler member when the filler member is present.

27. The system of claim 26, wherein the filler member comprises a polyurethane foam or a three-dimensional textile form.

28. The system of any of claims 17-27, further comprising a sensor configured to sense relative changes in one or more variables, including pressure, temperature, pH, relative humidity, and location, near the tissue site.

29. The system of claim 28, wherein the sensor is configured to wirelessly provide information regarding the one or more variables to a person or to a pressure control system configured to control the negative-pressure source.

30. A method for treating a compartmented wound site, the method comprising:

opening the compartmented wound site to form an open cavity;

deploying within the compartmented wound site the dressing of any of claims 1-16 or at least a portion of the system for treating a tissue site according to any of claims 17-29; deploying a negative-pressure connector subsystem;

deploying a cover to form a fluid seal over the open cavity;

fluidly coupling the negative-pressure connector subsystem to a negative-pressure source; and

activating the negative-pressure source.

31. The method of claim 30, wherein the compartmented wound site comprises a peritoneal or abdominal cavity.

32. The systems, apparatuses, dressings, compositions, and methods substantially as described herein.