Negative pressure wound therapy dressing

• US 10,154,929 B2
• Filed: 03/29/2016
• Issued: 12/18/2018
• Est. Priority Date: 04/04/2011
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Corley, Kevin
• Primary Examiner(s): Wiest, Philip R
• Assistant Examiner(s): Townsend, Guy K
• Application Number:
  US15/083,825
• Publication Number:
  US 20160317356A1
• Time in Patent Office: 994 Days
• CPC Class Codes: A61F 13/0203 with fluid retention members
• 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: A61F 13/36 Surgical swabs, e.g. for absorbency or packing body cavities during surgery A61F13/38 takes precedence
• CPC Class Codes: A61F 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00357 implanted wound fillings or covers membranes for covering bone defects A61F2/2846
• CPC Class Codes: A61F 2013/0074 containing foams
• CPC Class Codes: A61M 1/882 Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid
• 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

Abstract

A wound dressing suitable for use in negative pressure wound therapy system includes a cover layer adapted to establish a reservoir over a wound in which a negative pressure may be maintained. The cover layer includes an opening therein through which atmospheric gasses and wound exudates may pass through the cover layer. A vacuum port is affixed to the cover layer, and establishes a substantially fluid tight seal about the opening in the cover layer. The vacuum port includes a hollow interior in fluid communication with the opening in the cover layer and a connector to facilitate connection to a vacuum source. A packing member is affixed to the cover layer, to provide a wound dressing that may be applied in a single step process. The packing member is adapted to fill the wound and support the cover layer when a negative pressure is applied to the reservoir.

Claims

1. A wound treatment system, which comprises:

a cover layer adapted to establish a reservoir over a wound in which a negative pressure may be maintained;

a vacuum port configured to be affixed to the cover layer to establish a substantially fluid tight seal about an opening formed in the cover layer, the vacuum port including a hollow interior configured to be in fluid communication with the opening in the cover layer, and a connector to facilitate connection to a vacuum source; and

a foam packing member, the packing member comprising a continuous strip of open cell foam with no inner conduit and arranged in a plane substantially parallel to the plane of the cover layer and adapted to support the cover layer when a negative pressure is applied to the reservoir, the packing member arranged in a continuous spiral configuration comprising a seam, the seam extending from a first end to a second end of the packing member.

2. The wound treatment system according to claim 1, wherein the packing member includes an open-celled foam arranged to exhibit a generally planar cross-section.

3. The wound treatment system according to claim 2, wherein the packing member is arranged to radially surround the vacuum port.

4. The wound treatment system according to claim 1, wherein the spiral includes a plurality of minor seams extending laterally across the individual windings, the minor seams defining discrete separable components of the spiral.

5. The wound treatment system according to claim 1, wherein the packing member includes a plurality of discrete elongated fingers extending distally from a distal side of the cover layer.

6. The wound treatment system according to claim 5, wherein the elongated fingers are constructed of a tow of continuous filaments.

7. The wound treatment system according to claim 5, wherein the elongated fingers are constructed of strips of a foam material.

8. The wound treatment system according to claim 5, wherein the elongated fingers are constructed of strips of at least one of the group consisting of gauze, woven fabrics and non-woven absorbent materials.

9. The wound treatment system according to claim 5, wherein the packing member includes a supporting media affixed to the cover layer, the supporting media defining a plurality of apertures therein through which a proximal end of the elongated fingers are interlaced.

10. The wound treatment system according to claim 9, wherein the supporting media is constructed as a generally planar polymeric mesh.

11. The wound treatment system according to claim 9, wherein the supporting media defines a flange of the vacuum port.

12. The wound treatment system according to claim 5, wherein the packing member includes a cellulose solution adapted to maintain the packing member in a relatively rigid condition prior installation of the wound dressing, and a relatively pliable condition when the packing member is in contact with a wound.

13. The wound treatment system according to claim 12, wherein the cellulose solution arranged on an outer surface of the elongated fingers to substantially encapsulate the elongated fingers.

14. The wound treatment system according to claim 1, wherein the opening in the cover layer is configured to allow atmospheric gasses and wound exudates to pass through.

15. The wound treatment system according to claim 1, wherein the packing member is affixed to the cover layer.

16. The wound treatment system according to claim 1, wherein the foam packing member is adjacent to the vacuum port.

17. wound treatment system according to claim 1, wherein the f seam further comprises perforations.