Wound dressing for use in vacuum therapy

Patent metadata

Field	Value
Publication number	US-10968543-B2
Application number	US-201214362039-A
Country	US
Kind code	B2
Filing date	Nov 29, 2012
Priority date	Dec 1, 2011
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A wound dressing for use in vacuum wound therapy comprising a wound contact layer which is an open structure comprising a yarn comprising gel-forming filaments or fibres, the structure having a porosity which allows exudate to flow through it.

First claim

The invention claimed is:

1. A wound dressing for use in vacuum wound therapy comprising
a wound contact layer comprising an open structure in a form of a net comprising a spun yarn comprising a blend of gel-forming filaments or fibres and textile fibres, the net having a pore or mesh size from 0.5 mm 2 to 5.0 mm 2 that allows exudate to flow through the net, wherein the yarn has a linear density of 20 tex to 40 tex, wherein the yarn has a dry tensile strength of at least 10 cN/tex, wherein the textile fibers have an absorbency of between 5 g/g and 10 g/g as measured by the free swell method, and wherein the blend of gel-forming filaments or fibres and textile fibres includes only one type of gel-forming filaments or fibres.

2. A wound dressing as claimed in claim 1 wherein the net is knitted, woven, or embroidered.

3. A wound dressing as claimed in claim 1 wherein the pore or mesh size of the net is between 3.0 mm 2 to 4.0 mm 2 .

4. A wound dressing as claimed in claim 1 wherein the net is knitted.

5. A wound dressing as claimed in claim 1 wherein the net is joined at intervals to form a set of meshes.

6. A wound dressing as claimed in claim 1 wherein the yarn comprises 30% to 100% by weight gel-forming filaments or fibres.

7. A wound dressing as claimed in claim 1 wherein the net comprises 50% to 100% by weight gel-forming filaments or fibres.

8. The wound dressing of claim 1 wherein the yarn has a dry tensile strength from 10 cN/tex to 40 cN/tex.

9. The wound dressing of claim 1 wherein the spun yarn comprises a blend of the gel-forming filaments or fibres and the textile fibres in a ratio of 60:40 to 70:30.

10. The wound dressing of claim 1 , wherein the pore or mesh size of the net facilitates application of strain to tissue through pores or mesh of the net to stimulate tissue growth when a vacuum of at least 0.4 atm is applied by a vacuum source to the wound dressing such that a relative vacuum is retained in the wound dressing.

11. A device for vacuum wound therapy comprising:
a wound dressing comprising an open structure in a form of a net comprising a spun yarn comprising a blend of gel-forming filaments or fibres and textile fibres, the net having a pore or mesh size from 0.5 mm 2 to 5.0 mm 2 that allows exudate to flow through the net, wherein the yarn has a linear density of 20 tex to 40 tex, wherein the yarn has a dry tensile strength of at least 10 cN/tex, and wherein the blend of gel-forming filaments or fibres and textile fibres includes only one type of gel-forming filaments or fibres;
a source of vacuum situated to be separated from a wound bed by the wound dressing; and
a vacuum sealing layer separate from the wound dressing that covers the wound dressing and is adapted to retain relative vacuum in the wound dressing,
wherein the pore or mesh size of the net facilitates application of strain to tissue through pores or mesh of the net to stimulate tissue growth when a vacuum of at least 0.4 atm is applied by the source of vacuum to the wound dressing such that the relative vacuum is retained in the wound dressing by the vacuum sealing layer.

12. A device as claimed in claim 11 wherein the net is knitted, woven, or embroidered.

13. A device as claimed in claim 11 wherein the yarn comprises 30% to 100% by weight gel-forming filaments or fibres.

14. A device as claimed in claim 11 wherein the net comprises 50% to 100% by weight gel-forming filaments or fibres.

15. The device of claim 11 wherein the yarn has a dry tensile strength from 10 cN/tex to 40 cN/tex.

16. The device of claim 11 wherein the spun yarn comprises a blend of the gel-forming filaments or fibres and the textile fibres in a ratio of 60:40 to 70:30.

17. The device of claim 11 , wherein the textile fibers have an absorbency of between 5 g/g and 10 g/g as measured by the free swell method.

18. A wound dressing comprising a wound contact layer comprising an open structure in a form of a net comprising a spun yarn comprising a blend of gel-forming filaments or fibres and textile fibres, the net having a pore or mesh size from 0.5 mm 2 to 5.0 mm 2 that allows exudate to flow through the net, wherein the yarn has a linear density of 20 tex to 40 tex, wherein the yarn has a dry tensile strength of at least 10 cN/tex, and wherein the blend of gel-forming filaments or fibres and textile fibres includes only one type of gel-forming filaments or fibres.

19. The wound dressing of claim 18 wherein the yarn has a dry tensile strength from 10 cN/tex to 40 cN/tex.

20. The wound dressing of claim 18 , wherein the pore or mesh size of the net facilitates application of strain to tissue through pores or mesh of the net to stimulate tissue growth when a vacuum of at least 0.4 atm is applied by a vacuum source to the wound dressing such that a relative vacuum is retained in the wound dressing.

Assignees

• Convatec Technologies Inc

Inventors

• Bonnefin Wayne
• Wroe Sarah
• Prentice Amelia

Classifications

• A61F2013/00229

  with alginate · CPC title

• A61F2013/0054

  for deep wounds · CPC title

• D01G15/00

  Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines (de-burring apparatus or machines operating independently D01B) · CPC title

• D02G3/04 Primary

  Blended or other yarns or threads containing components made from different materials · CPC title

• Y10T428/2975

  Tubular or cellular · CPC title