Negative pressure wound therapy apparatus

Patent metadata

Field	Value
Publication number	US-12447057-B2
Application number	US-202217895482-A
Country	US
Kind code	B2
Filing date	Aug 25, 2022
Priority date	Jun 14, 2017
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

Disclosed embodiments relate to apparatuses and methods for wound treatment. In certain embodiments, a negative pressure wound therapy apparatus can include a wound dressing with a spacer layer separated from the absorbent layer by intermediate layers or drapes. The wound dressing can include a first portion comprising a wound contact or tissue contact layer, a first spacer layer, and a first backing layer comprising a first aperture. The spacer layer can be positioned between the contact layer and the first backing layer. The dressing can have a second portion comprising an intermediate drape with a second aperture, an absorbent layer, and a second backing layer. The absorbent layer is positioned between the intermediate drape and the second backing layer. The first aperture and the second aperture are configured to be sealed and allow fluid communication between the first portion and the second portion of the wound dressing.

First claim

What is claimed is:

1. A negative pressure wound therapy apparatus, comprising:
a wound dressing comprising a first dressing portion and a second dressing portion overlying the first dressing portion,
the first dressing portion comprising:
a tissue contact layer configured to be positioned in contact with a wound and/or skin surrounding a wound, wherein the tissue contact layer comprises a first border portion at a perimeter of the tissue contact layer;
a first dressing layer; and
a first backing layer comprising a first aperture, wherein the first backing layer comprises a second border portion at a perimeter of the first backing layer, wherein the first dressing layer is positioned between the tissue contact layer and the first backing layer and the first border portion of the tissue contact layer is directly bonded to the second border portion of the first backing layer; and

the second dressing portion comprising:
an intermediate drape comprising a second aperture, wherein the intermediate drape comprises a third border portion at a perimeter of the intermediate drape;
a second dressing layer, and
a second backing layer comprising a fourth border portion at a perimeter of the second backing layer, wherein the second dressing layer is positioned between the intermediate drape and the second backing layer and the third border portion of the intermediate drape is directly bonded to the fourth border portion of the second backing layer; and

wherein the second dressing portion is attached to the first dressing portion such that the first aperture and the second aperture are fluidly connected, and wherein the second border portion of the first backing layer is unattached and not bonded to the third border portion of the intermediate drape.

2. The negative pressure wound therapy apparatus of claim 1 , further comprising a negative pressure source configured to apply negative pressure through a third aperture in the second backing layer, wherein the first, second, and third apertures are in fluid communication with each other and are configured to provide fluid communication between the negative pressure source and the wound.

3. The negative pressure wound therapy apparatus of claim 2 , further comprising a filter configured to prevent or inhibit liquid from entering a suction port attached to the second backing layer over the third aperture in the second backing layer.

4. The negative pressure wound therapy apparatus of claim 1 , wherein the first dressing layer comprises foam.

5. The negative pressure wound therapy apparatus of claim 1 , wherein the second dressing layer comprises superabsorbent material.

6. The negative pressure wound therapy apparatus of claim 5 , further comprising a third dressing layer comprising a spacer layer, wherein the spacer layer is positioned between the second dressing layer and the intermediate drape.

7. The negative pressure wound therapy apparatus of claim 1 , wherein the first backing layer comprises a flexible material or additional material configured to allow the first backing layer to bend.

8. The negative pressure wound therapy apparatus of claim 1 , wherein the first dressing layer comprises a spacer layer and the spacer layer comprises a plurality of slits.

9. The negative pressure wound therapy apparatus of claim 1 , wherein the tissue contact layer, the first backing layer, the intermediate drape and the second backing layer all have substantially the same perimeter size and shape.

10. The negative pressure wound therapy apparatus of claim 1 , wherein the first backing layer is configured to be attached to the intermediate drape at an area around the first aperture and an area around the second aperture.

11. The negative pressure wound therapy apparatus of claim 1 , wherein the tissue contact layer extends across an entire area below the first backing layer.

12. A method of treating a wound with a negative pressure wound therapy apparatus, comprising:
positioning a wound dressing over the wound, the wound dressing comprising:
a first portion and a second portion, the first portion comprising:
a tissue contact layer configured to be positioned in contact with a wound and/or skin surrounding a wound, wherein the tissue contact layer comprises a first border portion at a perimeter of the tissue contact layer;
a first dressing layer; and
a first backing layer comprising a first aperture, wherein the first backing layer comprises a second border portion at a perimeter of the first backing layer, wherein the first dressing layer is positioned between the tissue contact layer and the first backing layer and the first border portion of the tissue contact layer is directly bonded to the second border portion of the first backing layer; and

the second portion comprising:
an intermediate drape comprising a second aperture, wherein the intermediate drape comprises a third border portion at a perimeter of the intermediate drape;
a second dressing layer, and
a second backing layer comprising a fourth border portion at a perimeter of the second backing layer, wherein the second dressing layer is positioned between the intermediate drape and the second backing layer and the third border portion of the intermediate drape is directly bonded to the fourth border portion of the second backing layer;

wherein the second portion is attached to the first portion such that the first aperture and the second aperture are fluidly connected, and wherein the second border portion of the first backing layer is unattached and not bonded to the third border portion of the intermediate drape; and
applying negative pressure through a third aperture in the second backing layer, wherein the first, second, and third apertures provide fluid communication between a source of negative pressure and the wound.

13. A negative pressure wound therapy apparatus, comprising:
a wound dressing apparatus comprising a first portion and a second portion overlapping the first portion,
the first portion comprising:
a tissue contact layer configured to be positioned in contact with a wound and/or skin surrounding a wound, wherein the tissue contact layer comprises a first border portion at a perimeter of the tissue contact layer;
a spacer layer; and
a backing layer comprising a first aperture, wherein the backing layer comprises a second border portion at a perimeter of the backing layer, wherein the spacer layer is positioned between the tissue contact layer and the backing layer and the first border portion of the tissue contact layer is directly bonded to the second border portion of the backing layer; and

the second portion comprising:
an intermediate layer comprising a second aperture, wherein the intermediate layer comprises a third border portion at a perimeter of the intermediate layer;
a manifold layer,
a wicking layer, and
a top layer comprising a fourth border portion at a perimeter of the top layer, wherein the manifold layer and the wicking layer are positioned between the intermediate layer and the top layer and the third border portion of the intermediate layer is directly bonded to the fourth border portion of the top layer; and

wherein the second portion is attached to the first portion such that the first aperture and the second aperture are fluidly connected, and wherein the second border portion of the backing layer is unattached and not bonded to the third border portion of the intermediate layer.

14. The negative pressure wound therapy apparatus of claim 13 , wherein the spacer layer is configured to distribute fluid throughout the wound.

15. The negative pressure woun

Assignees

• Smith & Nephew

Inventors

• Greener Bryan

Classifications

• A61M1/784

  by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves · CPC title

• A61M1/985

  the dressing itself forming the collection container · CPC title

• A61M1/915

  Constructional details of the pressure distribution manifold · CPC title

• A61M1/912

  Connectors between dressing and drainage tube · CPC title

• A61F13/0246 Primary

  characterised by the skin-adhering layer · CPC title