Wound dressing

Patent metadata

Field	Value
Publication number	US-11701263-B2
Application number	US-201916720621-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Sep 26, 2006
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

A wound dressing, suitable for use in negative pressure wound therapy, comprising a body of porous material, the body of porous material comprising a plurality of cuts which provide regions of flexibility within the body. Further embodiments relate to methods of manufacturing and method of use of such wound dressings. In addition, the wound dressing can comprise a retaining mechanism removably coupled to the material and configured to retain the material in the expanded conformation.

First claim

What is claimed is:

1. A wound treatment apparatus, comprising:
a perforated foam layer, comprising:
a foam body; and
a first series of apertures extending all the way through the foam body, wherein:
the first series of apertures comprises a plurality of curved apertures arranged in an end to end pattern; and
the first series of apertures has a plurality of gaps between each of the plurality of curved apertures where the material is left uncut;

a second series of apertures extending all the way through the foam body, wherein:
the second series of apertures comprises a plurality of curved apertures arranged in an end to end pattern;
the second series of apertures has a plurality of gaps between each of the plurality of curved apertures where the material is left uncut;
the plurality of curved apertures of the second series of apertures are offset from the plurality of curved apertures of the first series of apertures so that each of the curved apertures of the second series of apertures is staggered relative to each of the curved apertures of the first series of apertures and so that each of the gaps of the second series of apertures is staggered relative to each of the gaps of the first series of apertures; and
the plurality of curved apertures of the first series of apertures are arranged in an end to end pattern along a curved path when the foam layer is in an initial conformation.

2. The wound treatment apparatus of claim 1 , wherein the plurality of curved apertures of the second series of apertures are offset from the plurality of curved apertures of the first series of apertures so that a center point of an aperture of the second series of apertures is aligned approximately with the gap of the first series of apertures.

3. The wound treatment apparatus of claim 1 , further comprising a third series of apertures extending all the way through the foam body, wherein:
the third series of apertures comprises a plurality of curved apertures arranged in an end to end pattern;
the third series of apertures has a plurality of gaps between each of the plurality of curved apertures where the material is left uncut;
each of the plurality of curved apertures of the third series of apertures forms an aperture in the foam body; and
the plurality of curved apertures of the third series of apertures are offset from the plurality of curved apertures of the second series of apertures so that each of the curved apertures of the third series of apertures is staggered relative to each of the curved apertures of the second series of apertures and so that each of the gaps of the third series of apertures is staggered relative to each of the gaps of the second series of apertures.

4. The wound treatment apparatus of claim 3 , further comprising a fourth series of apertures extending all the way through the foam body, wherein:
the fourth series of apertures comprises a plurality of curved apertures arranged in an end to end pattern;
the fourth series of apertures has a plurality of gaps between each of the plurality of curved apertures where the material is left uncut;
each of the plurality of curved apertures of the fourth series of apertures forms an aperture in the foam body; and
the plurality of curved apertures of the fourth series of apertures are offset from the plurality of curved apertures of the third series of apertures so that each of the curved apertures of the fourth series of apertures is staggered relative to each of the curved apertures of the third series of apertures and so that each of the gaps of the fourth series of apertures is staggered relative to each of the gaps of the third series of apertures.

5. The wound treatment apparatus of claim 1 , wherein nearly an entire first surface of the foam body is covered by curved apertures.

6. The wound treatment apparatus of claim 1 , wherein, when the perforated foam layer is stretched by the application of an extensive force to the perforated foam layer, the first series of apertures and the second series of apertures both expand so that the apertures of the first series of foam apertures and the apertures of the second series of foam apertures expand.

7. The wound treatment apparatus of claim 1 , wherein the first and second series of apertures provide macroscopic flexibility to the perforated foam layer to allow the perforated foam layer to drape more easily to conform to the shape of a wound.

8. The wound treatment apparatus of claim 1 , wherein the foam body has a thickness of from 15 mm to 40 mm.

9. The wound treatment apparatus of claim 1 , wherein the plurality of curved apertures of the first and second series of apertures extend through a thickness of the foam body.

10. The wound treatment apparatus of claim 1 , wherein the plurality of apertures of the first and second series of apertures are formed by cutting slits in the foam body.

11. The wound treatment apparatus of claim 1 , wherein the foam body comprises polyurethane.

12. The wound treatment apparatus of claim 1 , wherein the first and second series of curved apertures are in an arrangement that describes a circumference of a circle.

13. The wound treatment apparatus of claim 1 , wherein one or more of the plurality of gaps of the first and second series of apertures is from 1.5 mm to 4 mm in length.

14. The wound treatment apparatus of claim 1 , wherein the plurality of gaps of the first series of apertures separates each aperture from adjacent apertures in the first series of apertures, and the plurality of gaps of the second series of apertures separates each aperture from adjacent apertures in the second series of apertures.

15. The wound treatment apparatus of claim 1 , wherein the perforated foam layer is configured to transfer contractile forces to a wound site to promote wound closure.

16. A wound dressing, comprising:
a perforated contact layer;
the perforated foam layer of claim 1 ; and
a cover layer.

17. The wound treatment apparatus of claim 1 , wherein the plurality of curved apertures of the second series of apertures are arranged in an end to end pattern along a curved path that is spaced apart from the curved path of the first series of apertures.

18. A perforated foam layer for use in a negative pressure wound therapy dressing, comprising:
a foam body; and
a first series of slits extending all the way through the foam body, wherein:
the first series of slits comprises a plurality of curved slits arranged in an end to end pattern;
the first series of slits has a plurality of gaps between each of the plurality of curved slits where the material is left uncut; and
each of the plurality of curved slits of the first series of slits forms an aperture in the foam body;

a second series of slits extending all the way through the foam body;
wherein:
the second series of slits comprises a plurality of curved slits arranged in an end to end pattern;
the second series of slits has a plurality of gaps between each of the plurality of curved slits where the material is left uncut;
each of the plurality of curved slits of the second series of slits forms an aperture in the foam body; and
the plurality of curved slits of the second series of slits are offset from the plurality of curved slits of the first series of slits so that each of the curved slits of the second series of slits is staggered relative to each of the curved slits of the first series of slits and so that each of the gaps of the second series of slits is staggered relative to each of the gaps of the first series of slits;
wherein, when

Assignees

• Smith & Nephew Inc

Inventors

• Greener Bryan
• Freedline Allan

Classifications

• A61F13/00038 Primary

  Human Necessities · mapped topic

• A61F13/01038 Primary

  Flexibility, stretchability or elasticity · CPC title