Absorbent dressing and method

1. A system for treating a tissue site, comprising:

a dressing adapted to distribute reduced pressure from a reduced-pressure source to the tissue site, comprising:

a manifold layer adapted to be positioned proximate the tissue site,

a first storage layer positioned proximate the manifold layer,

a plurality of first fluid communication channels disposed through the first storage layer,

a first retainer disposed in each of the first fluid communication channels, wherein the first retainers are adapted to substantially preclude deformation of the first storage layer into the first fluid communication channels,

a second storage layer positioned in fluid communication with the first storage layer,

a plurality of second fluid communication channels disposed through the second storage layer,

a second retainer disposed in each of the second fluid communication channels, wherein the second retainers are adapted to substantially preclude deformation of the second storage layer into the second fluid communication channels,

wherein the second fluid communication channels are laterally offset from the first fluid communication channels; and

a sealing member adapted to cover the dressing and to provide a fluid seal between the sealing material and the tissue site.

2. The system of claim 1 , further comprising a conduit interface coupled in fluid communication with the dressing and adapted to provide fluid communication between the dressing and the reduced-pressure source.

3. The system of claim 1 , further comprising a fluid canister in fluid communication between the reduced-pressure source and the dressing, the fluid canister adapted to retain fluid from the tissue site.

4. The system of claim 1 , wherein the manifold layer comprises a porous, hydrophobic material.

5. The system of claim 1 , wherein the manifold layer is adapted to be positioned in contact with the tissue site, and wherein the first storage layer is disposed between the manifold layer and the second storage layer.

6. The system of claim 1 , wherein at least a portion of each of the first and the second storage layer comprises a hydrophilic material and is adapted to absorb fluid communicated from the tissue site, and wherein the first and the second retainers each comprise a porous, hydrophobic material.

7. The system of claim 1 , wherein the first storage layer has a first surface and an opposing second surface, the first surface of the first storage layer positioned proximate the manifold layer, and wherein each of the first fluid communication channels are in fluid communication with the manifold layer and between the first surface and the second surface of the first storage layer.

8. The system of claim 1 , wherein the second storage layer has a first surface and an opposing second surface, and wherein each of the second fluid communication channels are in fluid communication with the first storage layer and between the first surface and the second surface of the second storage layer.

9. The system of claim 1 , wherein the manifold layer is a first manifold layer, and wherein the dressing further comprises a second manifold layer positioned proximate the second absorbent layer and between the second absorbent layer and the sealing member, the second manifold layer comprising a porous, hydrophobic material.

10. The system of claim 1 , wherein the dressing further comprises an intermediate manifold layer positioned in fluid communication between the first and the second storage layer, wherein each of the first fluid communication channels are positioned proximate a first surface of the intermediate manifold layer and each of the second fluid communication channels are positioned proximate an opposing second surface of the intermediate manifold layer, the intermediate manifold layer comprising a porous, hydrophobic material.

11. The system of claim 1 , the dressing further comprising collagen, wherein the dressing has a porous structure, and wherein the collagen is adapted to substantially preclude clogging of the porous structure.

12. A system for treating a tissue site, comprising:

a dressing adapted to distribute reduced pressure from a reduced-pressure source to the tissue site, comprising:

a manifold layer adapted to be positioned proximate the tissue site,

a storage layer positioned proximate the manifold layer,

a fluid communication channel disposed through the storage layer, and

a retainer disposed in the fluid communication channel, wherein the retainer is adapted to substantially preclude deformation of the storage layer into the fluid communication channel, and wherein the retainer comprises a porous, hydrophobic material; and

a sealing member adapted to cover the dressing and to provide a fluid seal between the sealing material and the tissue site.

13. The system of claim 12 , further comprising a conduit interface coupled in fluid communication with the dressing and adapted to provide fluid communication between the dressing and the reduced-pressure source.

14. The system of claim 12 , further comprising a fluid canister in fluid communication between the reduced-pressure source and the dressing, the fluid canister adapted to retain fluid from the tissue site.

15. The system of claim 12 , wherein the manifold layer is in fluid communication with the tissue site and adapted to distribute reduced pressure to the tissue site, the manifold layer comprising a porous, hydrophobic material.

16. The system of claim 12 , wherein the storage layer is adapted to absorb fluid communicated from the tissue site through the manifold layer, at least a portion of the storage layer comprising a hydrophilic material.

17. The system of claim 12 , wherein the storage layer has a first surface and an opposing second surface, the first surface of the storage layer positioned proximate the manifold layer, and wherein the fluid communication channel is in fluid communication with the manifold layer and between the first surface and the second surface of the storage layer.

18. The system of claim 12 , wherein the manifold layer is a first manifold layer, and wherein the dressing further comprises a second manifold layer positioned in fluid communication between the storage layer and the sealing member.

19. The system of claim 12 , wherein:

the storage layer is a first storage layer;

the retainer is a first retainer;

the fluid communication channel is a first fluid communication channel; and

the dressing further comprises a second storage layer, a second fluid communication channel disposed through the second storage layer, and a second retainer disposed in the second fluid communication channel, wherein the second retainer is adapted to substantially preclude deformation of the second storage layer into the second fluid communication channel, wherein the second storage layer is positioned in fluid communication with the first storage layer, and wherein the second fluid communication channel is laterally offset from the first fluid communication channel.

20. The system of claim 19 , wherein the manifold layer is adapted to be positioned in contact with the tissue site, and wherein the first storage layer is disposed between the manifold layer and the second storage layer.

21. The system of claim 19 , wherein at least a portion of the second storage layer comprises a hydrophilic material and is adapted to absorb fluid communicated from the tissue site, and wherein the second retainer comprises a porous, hydrophobic material.

22. The system of claim 19 , wherein the second storage layer has a first surface and an opposing second surface, and wherein the second fluid communication channel is in fluid communication with the first storage layer and between the first surface and the second surface of the second storage layer.

23. The system of claim 19 , wherein the dressing further comprises an intermediate manifold layer positioned in fluid communication between the first and the second storage layer, and wherein the first fluid communication channel is positioned proximate a first surface of the intermediate manifold layer and the second fluid communication channel is positioned proximate an opposing second surface of the intermediate manifold layer, the intermediate manifold layer comprising a porous, hydrophobic material.

24. The system of claim 19 , wherein the manifold layer is a first manifold layer, and wherein the dressing further comprises a second manifold layer positioned proximate the second storage layer and between the second storage layer and the sealing member, the second manifold layer comprising a porous, hydrophobic material.

25. The system of claim 12 , the dressing further comprising collagen, wherein the dressing has a porous structure, and wherein the collagen is adapted to substantially preclude clogging of the porous structure.

26. A system for treating a tissue site, comprising:

a dressing adapted to distribute reduced pressure from a reduced-pressure source to the tissue site, comprising:

a manifold layer adapted to be positioned proximate the tissue site,

a first storage layer positioned proximate the manifold layer,

a first fluid communication channel disposed through the first storage layer,

a first retainer disposed in the first fluid communication channel, wherein the first retainer is adapted to substantially preclude deformation of the first storage layer into the first fluid communication channel,

a second storage layer,

a second fluid communication channel disposed through the second storage layer,

a second retainer disposed in the second fluid communication channel, wherein the second retainer is adapted to substantially preclude deformation of the second storage layer into the second fluid communication channel, wherein the second storage layer is positioned in fluid communication with the first storage layer, and wherein the second fluid communication channel is laterally offset from the first fluid communication channel; and

a sealing member adapted to cover the dressing and to provide a fluid seal between the sealing material and the tissue site.