WOUND DRESSING AND METHOD OF TREATMENT

• US 20160144084A1
• Filed: 03/14/2014
• Published: 05/26/2016
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: COLLINSON, SARAH JENNY, Fry, Nicholas Charlton, Gowans, Philip, Hartwell, Edward Yerbury, Phillips, Marcus Damian
• Granted Patent: US 10,493,184 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 13/01029 made of multiple layers
• 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: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61M 1/913 having a bridging element for transferring the reduced pressure from the connector to the dressing
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/916 specially adapted for deep wounds

Abstract

Embodiments disclosed herein are directed to negative pressure treatment systems and wound dressing systems, apparatuses, and methods that may be used for the treatment of wounds. In particular, some embodiments are directed to improved wound dressings comprising a bridge portion connecting two or more portions of an absorbent layer that facilitates trimming of the wound dressing to suitable sizes. Some embodiments provide for trimming the dressing in a gap between two or more portions of an absorbent layer and sealing the exposed portion of dressing after trimming when the dressing is applied to skin surrounding a wound.

Claims

1. A wound treatment apparatus for treatment of a wound site comprising:

a backing layer having an upper surface and a lower surface and defining a perimeter configured to be positioned over skin surrounding a wound site, wherein the backing layer is configured to maintain negative pressure over the wound site;

a first portion underneath the backing layer having a first layer structure comprising at least one material layer configured to transmit negative pressure to the wound site; and

a bridging portion underneath the backing layer having a second layer structure comprising at least one material layer configured to transmit negative pressure from the first portion through the bridging portion, wherein the second layer structure of the bridging portion is different than the first layer structure of the first portion.

2. The apparatus of claim 1, further comprising a wound contact layer positioned below the backing layer, wherein the wound contact layer is sealed to the backing layer along a perimeter of the backing layer.

3. The apparatus of claim 1, wherein the at least one material layer of the first layer structure comprises one or more transmission layers.

4. The apparatus of claim 3, wherein the one or more transmission layers are selected from the group consisting of reticulated open-cell foam, woven material, non-woven material, 3D knit fabric, Baltex 7970 weft knitted polyester, acquisition distribution material, DryWeb TDL2, SlimCore TL4, and combinations thereof.

5. The apparatus of claim 3, wherein the first layer structure of the first portion further comprises an absorbent layer positioned above the one or more transmission layers.

7. The apparatus of claim 1, wherein the at least one material layer of the second layer structure is capable of transmitting a negative pressure of at least −

40 mmHg against a set point in the range −

60 to −

200 mmHg with an air leak of 50 scc/minute.

8. The apparatus of claim 1, wherein the at least one material layer of the second layer structure is capable of experiencing a pressure differential of approximately −

25 mmHg or less at a set point of −

200 mmHg with an air leak of 50 scc/minute over an approximately 20 mm±

1 mm distance.

9. The apparatus of claim 1, wherein the at least one material layer of the second layer structure is capable of experiencing a pressure differential of approximately −

5 mmHg or less at a set point of −

200 mmHg with an air leak of 50 scc/minute over an approximately 20 mm±

1 mm distance.

10. The apparatus of claim 1, wherein the at least one material layer of the second layer structure has a width of at least 1 mm.

12. The apparatus of claim 1, wherein the second layer structure comprises fewer layers than the first layer structure.

14. The apparatus of claim 1, wherein the layer(s) in the second layer structure have a smaller height than the layer(s) in the first layer structure.

17. The apparatus of claim 1, wherein the bridging portion connects the first portion to an adjacent portion, the adjacent portion having the first layer structure.

18. The apparatus of claim 17, comprising multiple bridging portions connecting the first portion to multiple adjacent portions, each of the multiple bridging portions having the second layer structure, each of the multiple adjacent portions having the first layer structure.

19. The apparatus of claim 17, comprising multiple bridging portions connecting multiple adjacent portions, each of the multiple bridging portions having second layer structure, each of the multiple adjacent portions having the first layer structure.

24. The apparatus of claim 3, wherein the one or more transmission layers comprise a first layer of a spacer material configured to vertically wick fluid.

25. The apparatus of claim 24, wherein the one or more transmission layers comprise a second layer of an acquisition distribution material configured to horizontally wick fluid, the second layer positioned above the first layer.

34. The apparatus of claim 5, wherein the absorbent material is absent in the second layer structure.

117. The apparatus of claim 1, further comprising a port configured to transmit the negative pressure through the backing layer for the application of topical negative pressure at the wound site.

118. The apparatus of claim 117, wherein the port is provided over the first portion.

119. The apparatus of claim 117, further comprising a source of negative pressure connected to the port.

6. (canceled)

11. (canceled)

13. (canceled)

15. (canceled)

16. (canceled)

20-23. -23. (canceled)

26-33. -33. (canceled)

35-116. -116. (canceled)