Tissue Interface With Integral Fluid-Control Layer

Patent metadata

Field	Value
Publication number	US-2022211932-A1
Application number	US-202017604802-A
Country	US
Kind code	A1
Filing date	Mar 16, 2020
Priority date	May 17, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

Tissue dressing materials and associated methods of forming such dressing materials are disclosed. In one example embodiment, a dressing material may include a foam and a film formed on a first side of the foam. The film may be integrally-formed on the side of the foam. The film may include a plurality of apertures. A method of making the dressing material may include placing a pre-polymer mixture and water into a mold to create the dressing material comprising a foam and an integral film on at least one surface of the foam. The method may further include forming a plurality of openings in at least the integral film, with the openings being formed within the mold or subsequent to removal of the dressing material from the mold.

First claim

1 . A method for manufacturing a dressing material, comprising:
placing a pre-polymer mixture and water into a mold to generate a reaction that produces a foam and an integral film on at least one surface of the foam; and forming a plurality of openings in the integral film of the dressing material.

2 . The method of claim 1 , further comprising placing a secondary film in the mold prior to placing the pre-polymer mixture and water into the mold.

3 . The method of claim 2 , wherein the secondary film comprises one or more of a patterned material, a colored material, and a plurality of textured features.

4 . (canceled)

5 . (canceled)

6 . The method of claim 1 , wherein the mold is an open tray and the method further comprises skiving a top surface of the foam formed in the open tray.

7 . The method of claim 6 , wherein the mold comprises a bottom side having a first surface facing an interior of the mold, and wherein the first surface is smooth.

8 . The method of claim 1 , wherein the pre-polymer mixture comprises isocyanate and polyol.

9 . The method of claim 1 , wherein the pre-polymer mixture comprises molten polyethylene and a low-boiling-point liquid.

10 . (canceled)

11 . (canceled)

12 . The method of claim 1 , wherein forming the plurality of openings comprises using a blade to make fenestrations in the integral film.

13 . The method of claim 1 , wherein forming the plurality of openings comprises using one or more pins to make the openings in the integral film.

14 . The method of claim 1 , wherein the plurality of openings extend through at least a portion of the foam.

15 . The method of claim 1 , wherein the plurality of openings are formed by a plurality of pins within the mold.

16 . The method of claim 1 , wherein the integral film has a thickness of between 20 μm and 100 μm, and wherein the foam has a thickness of between 4 mm and 50 mm.

17 . (canceled)

18 . The method of claim 1 , wherein an interior surface of the mold comprises a plurality of embossed features.

19 . The method of claim 1 , wherein the mold comprises an anatomical shape corresponding to at least one of a breast, a hand, a sacral region, or a foot.

20 . (canceled)

21 . (canceled)

22 . (canceled)

23 . (canceled)

24 . (canceled)

25 . (canceled)

26 . The method of claim 1 , further comprising placing the dressing material in a reticulation chamber and applying a gas to form a plurality of pores in the foam.

27 . A tissue interface, comprising:
a foam having a first side, a second side, and a fluid-control layer on the first side; and a plurality of apertures extending through the fluid-control layer.

28 . (canceled)

29 . (canceled)

30 . The tissue interface of claim 27 , wherein the second side of the foam comprises a plurality of embossed features.

31 . (canceled)

32 . The tissue interface of claim 27 , wherein the foam comprises a plurality of perforations.

33 . (canceled)

34 . (canceled)

35 . The tissue interface of claim 27 , wherein the tissue interface comprises an anatomical shape corresponding to at least one of a foot, a hand, a breast, or a sacral region.

36 . (canceled)

37 . (canceled)

38 . (canceled)

39 . (canceled)

40 . (canceled)

41 . (canceled)

42 . (canceled)

43 . The tissue interface of claim 27 , wherein the plurality of apertures comprise linear fenestrations that are distributed across the fluid-control layer.

44 . (canceled)

45 . The tissue interface of claim 27 , wherein the fluid-control layer comprises an adhesive surface, and wherein the adhesive surface comprises a silicone gel.

46 . (canceled)

47 . The tissue interface of claim 27 , wherein the fluid-control layer comprises a liquid-impermeable film.

48 . (canceled)

49 . (canceled)

50 . A system for treating a tissue site, comprising:
the tissue interface according to claim 27 ; and a cover comprising a polymer drape adapted to be positioned over a second side of the foam.

51 . The system of claim 50 , wherein the fluid-control layer comprises a film integrally-formed on a first side of the foam.

52 . (canceled)

53 . (canceled)

54 . (canceled)

55 . The system of claim 50 , further comprising:
a dressing interface adapted to be coupled to the cover; and a negative-pressure source adapted to be fluidly connected to the tissue interface through the dressing interface.

56 . (canceled)

57 .- 72 . (canceled)

Assignees

• Kci Licensing Inc

Inventors

• Robinson Timothy Mark
• Locke Christopher Brian
• Long Justin Alexander

Classifications

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• B29C44/02

  for articles of definite length, i.e. discrete articles · CPC title

• A61F13/022

  having more than one layer with different fluid retention characteristics · CPC title

• B29C44/5663

  by perforating the foam, e.g. to open the cells · CPC title

• A61M1/91 Primary

  Suction aspects of the dressing · CPC title