Provision of wound filler

• US 8,998,866 B2
• Filed: 07/01/2011
• Issued: 04/07/2015
• Est. Priority Date: 07/02/2010
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Hicks, John Kenneth
• Primary Examiner(s): Deak, Leslie
• Assistant Examiner(s): WENG, KAI H
• Application Number:
  US13/806,722
• Publication Number:
  US 20130116641A1
• Time in Patent Office: 1,376 Days
• Field of Search: 604/313, 604/317, 604/319, 604/543, 604/304, 128/898, 128/897
• US Class Current: 604/319
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• CPC Class Codes: A61F 13/00987 Apparatus or processes for manufacturing non-adhesive dressings or bandages
• 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 2013/00357 implanted wound fillings or covers membranes for covering bone defects A61F2/2846
• CPC Class Codes: A61L 26/0019 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: A61L 26/0085 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 2210/04 Skin

Abstract

A process of manufacturing a wound dressing filler and/or wound dressing.

Claims

1. A method of providing wound filler at a wound site prior to application of negative pressure wound therapy, the method comprising:

first, securing a drape over a wound cavity to form a seal;

second and subsequently to forming the seal, injecting a liquid foam filler material through an aperture in the drape, the liquid foam filler material configured to expand outward as the liquid foam filler material cures into a solid and substantially fills an entire volume of the wound cavity, the liquid foam filler material applying an outward force a against the wound cavity and the drape and thereby directing the expanding foam filler through the aperture without causing the seal to lift away from the wound cavity; and

third, removing excess foam filler material which flows out through the aperture.

2. The method as claimed in claim 1, wherein the foam filler cures into the form of an elongated string, the elongated string comprising a porous lattice structure.

3. The method as claimed in claim 1, further comprising:

forming a porous structure by injecting a pre-mixed biocompatible foam.

4. The method as claimed in claim 1, further comprising:

lining a wound bed at the wound site with a liner element prior to securing the drape over the wound site.

5. The method as claimed in claim 1, further comprising:

locating a fluid communication port over each opening in the drape.

6. The method as claimed in claim 1, further comprising:

urging injected filler material into peripheral regions of a wound cavity under the drape prior to allowing the filler material to set or curing the filler material.

7. The method as claimed in claim 6, further comprising:

injecting the filler material with an injector apparatus comprising a nozzle member; and

urging the filler material with the nozzle member.

8. The method as claimed in claim 1, wherein removing excess filler material comprises cutting off semi-solid filler material subsequent to drape the material having flowed out through the aperture.

9. The method as claimed in claim 1, wherein connecting the injected filler material comprises:

securing a suction port comprising a spout member and a flange member over each opening in the drape; and

securing a distal end of a suction lumen to the spout member of the suction port.

10. The method of claim 1, wherein removing excess filler material comprises removing an outer skin layer of the filler material.

11. The method of claim 10, wherein the outer skin layer comprises a section of foam that has cured into a structure that will not transmit negative pressure.

18. The method as claimed in claim 7, wherein the injector apparatus comprises two chambers and a static mixer.

12. A method of providing negative pressure wound therapy at a wound site, comprising:

first, securing at least one drape over a wound site to form a seal;

second and subsequently to forming the seal, injecting filler material through at least one opening in the drape, the filler material configured to expand and fill a wound cavity under the drape, the filler material further configured to apply an outward force to the wound and the drape without causing the seal to lift away from the wound cavity;

third, fluidically connecting the injected filler material to a source of negative pressure; and

fourth, applying negative to the wound cavity pressure via said source.

13. The method as claimed in claim 12, further comprising:

urging injected filler material into peripheral regions of a wound cavity under the drape prior to allowing the filler material to set or curing the filler material.

14. The method as claimed in claim 13, further comprising:

injecting the filler material with an injector apparatus comprising a nozzle member; and

urging the filler material with the nozzle member.

15. The method as claimed in claim 12, wherein applying negative pressure comprises one of selectively, continuously, or intermittently applying a predetermined negative pressure via a suction pump.

16. The method as claimed in claim 12, further comprising removing excess filler material that flows through an opening in the drape.

17. The method as claimed in claim 12, wherein the filler material is in the shape of an elongated string.