Devices and methods for treating and closing wounds with negative pressure

• US 10,117,782 B2
• Filed: 05/23/2013
• Issued: 11/06/2018
• Est. Priority Date: 05/24/2012
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC), University Of Massachusetts
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC), University Of Massachusetts
• Inventors: Dagger, Anthony C., Fry, Nicholas Charlton, Hicks, John Kenneth, Huddleston, Elizabeth Mary, Phillips, Marcus Damian, Saxby, Carl, Dunn, Raymond M.
• Primary Examiner(s): Marcetich, Adam
• Assistant Examiner(s): Arble, Jessica
• Application Number:
  US14/403,163
• Publication Number:
  US 20150150729A1
• Time in Patent Office: 1,993 Days
• CPC Class Codes: A61F 13/01021 characterised by the structure of the dressing
• 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: A61M 1/912 Connectors between dressing and drainage tube
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/916 specially adapted for deep wounds
• CPC Class Codes: A61M 2210/1021 Abdominal cavity

Abstract

The present invention relates to a negative pressure wound closure system and methods for using such a system. Preferred embodiments of the invention facilitate closure of the wound by preferentially contracting to provide for movement of the tissue.

Claims

1. A wound filler for use in treating a wound with negative pressure, comprising:

a porous wound filling material; and

a plurality of sheets or slabs configured to extend vertically and lengthwise across a wound bed when the wound filler is positioned within the wound bed, the plurality of sheets or slabs being made of a more rigid material than the porous wound filling material;

wherein the plurality of sheets or slabs are spaced apart and dispersed throughout the wound filler in a horizontal plane;

wherein the plurality of sheets or slabs are fully surrounded by the porous wound filling material in the horizontal plane and the porous wound filling material extends between the plurality of sheets or slabs;

wherein the sheets or slabs are aligned parallel to one another; and

wherein upon application of negative pressure to the wound filler, the wound filler is configured to contract horizontally with the sheets or slabs reducing vertical movement of the wound filler.

2. The wound filler of claim 1, wherein the porous wound filling material surrounds the plurality of sheets or slabs.

3. The wound filler of claim 1, wherein the porous wound filling material comprises a plurality of slits or areas in which the plurality of sheets or slabs are inserted.

4. The wound filler of claim 1, wherein flexible material is positioned between the sheets or slabs to allow compression of the sheets or slabs towards each other in a horizontal plane when the wound filler is positioned within a wound bed and is placed under negative pressure.

5. The wound filler of claim 1, wherein the plurality of sheets or slabs are adhered to the porous wound filling material.

6. The wound filler of claim 1, further comprising one or more draw strings or cords extending through the wound filler configured such that pulling of the draw strings will cause contracting of the wound filler in a horizontal plane.

7. The wound filler of claim 1, wherein the sheets or slabs are spaced apart equally in the wound filler when the wound filler is positioned within a wound bed.

8. The wound filler of claim 1, wherein the sheets or slabs are spaced apart unequally in the wound filler when the wound filler is positioned within a wound bed.

9. The wound filler of claim 1, wherein the sheets or slabs and the wound filling material are portions of material that are substantially parallel to one another and alternatingly stacked adjacent to one another.

10. A negative pressure wound therapy system, comprising:

the wound filler of claim 1; and

a wound cover configured to be placed over the wound filler.

11. The system of claim 10, further comprising a connection for connecting the wound cover to a source of negative pressure.

12. The system of claim 10, further comprising a negative pressure source configured to be connected to the wound cover to provide negative pressure to the wound filler when placed within the wound bed.

13. A method of treating a wound, comprising:

positioning the wound filler of claim 1 into a wound bed;

covering the wound filler with a wound cover; and

applying negative pressure to the wound cover, wherein the application of negative pressure causes the wound filler to contract horizontally with the sheets or slabs reducing vertical movement of the wound filler.