Method and apparatus for bridging from a dressing in negative pressure wound therapy

• US 8,162,907 B2
• Filed: 01/20/2009
• Issued: 04/24/2012
• Est. Priority Date: 01/20/2009
• Status: Expired

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Heagle, David G.
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): Hanrahan, Benedict L
• Application Number:
  US12/356,246
• Publication Number:
  US 20100185163A1
• Time in Patent Office: 1,190 Days
• Field of Search: 604/313, 604/290, 604304-307, 604/327, 604/540, 604/541, 604/543, 602 41- 44
• US Class Current: 604/313
• 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 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00412 for use with needles, tubes or catheters
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0054 for deep wounds
• CPC Class Codes: A61F 2013/00553 with detachable parts
• CPC Class Codes: A61M 1/86 Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/964 having venting means on or near the dressing
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 27/00 Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202

Abstract

A method of bridging from a wound dressing to a wound port for negative pressure wound therapy includes positioning an elongate wick between a wound and a remote location with respect to the wound. The elongate wick includes a three-dimensional spacer fabric having an upper fabric layer spaced from a lower fabric layer by an intermediate layer of pile threads. The elongate wick is covered with a flexible wick cover such that an enclosure is formed around the elongate wick. A substantially fluid-tight seal is established between a first end of the elongate wick cover and the wound dressing such that a reservoir is defined over the wound in which a negative pressure may be maintained. A substantially fluid-tight seal is established between a second end of the elongate wick cover and a fluid port configured for connection to a source of negative pressure.

Claims

1. A composite wound dressing apparatus comprising:

a cover layer for defining a reservoir over a wound in which a negative pressure may be maintained by forming a substantially fluid-tight seal around the wound, the cover layer including an aperture therein through which fluids may be extracted from the reservoir;

an elongate wick having a first end and a second end, the first end in fluid communication with the reservoir through the aperture in the cover layer, the second end disposed remotely with respect to the aperture in the cover layer, the elongate wick comprising a three-dimensional spacer fabric;

a flexible wick cover extending over the elongate wick and having a first end and a second end, the first end of the wick cover configured for forming a substantially fluid tight seal over the aperture in the cover layer, the second end of the wick cover cover including an aperture therein through which fluids may be extracted from the elongate wick, the wick cover having an adhesive coating for establishing a substantially fluid tight seal over the aperture in the cover layer and with the skin surface disposed remotely from the wound; and

a fluid port coupled to the wick cover and in fluid communication with the second end of the elongate wick through the aperture in the wick cover.

2. The apparatus according to claim 1, further comprising a skin covering positioned beneath at least a portion of the elongate wick to impede direct contact of the elongate wick with the skin surface.

3. The apparatus according to claim 2, wherein the skin covering defines a first width, the elongate wick defines a second width and the wick cover defines a third width, the third width of the wick cover substantially greater than the first width of the skin covering.

4. The apparatus according to claim 3, wherein the first width is about 2 inches, the second width is about one inch, and the third width is about 3 inches.

5. The apparatus according to claim 1, wherein the fluid port is configured to receive a fluid conduit.

6. The apparatus according to claim 2, wherein the fluid port includes a flange coupled to an underside of the wick cover.

7. The apparatus according to claim 1, wherein the elongate wick is treated with an antimicrobial agent.

8. The apparatus according to claim 7, wherein the antimicrobial agent is polyhexamethylene biguanide.

10. The apparatus according to claim 1, including a vacuum source in fluid communication with the fluid port, the vacuum source suitable for generating the negative pressure in the reservoir.

16. The apparatus according to claim 2, wherein at least a portion of the skin covering is interposed between the skin surface and the wick cover.

9. A negative pressure wound therapy apparatus, comprising:

a cover layer disposed over a reservoir in a wound in which a negative pressure may be maintained;

an elongate wick having a first end and a second end, the first end in fluid communication with the reservoir, the second end disposed remotely from the wound, the elongate wick comprising a three-dimensional spacer fabric;

a wick cover disposed over the elongate wick and having a first end and a second end, the first end of the wick cover configured for forming a substantially fluid tight seal with the cover layer, the second end of the wick cover including an aperture in fluid communication with the elongate wick,

an adhesive coating for the wick cover to establish a substantially fluid tight seal over the aperture in the cover layer and with the skin surface disposed remotely from the wound; and

a vacuum source in fluid communication with the reservoir.

11. The apparatus according to claim 9 wherein the vacuum source is in fluid communication with the reservoir through the elongate wick.

12. The apparatus according to claim 11 including a fluid port mounted to the wick cover, and wherein the vacuum source is in fluid communication with the reservoir through the fluid port.

13. The apparatus according to claim 11 wherein the elongate wick comprises polyhexamethylene biguanide.

14. The apparatus according to claim 11 wherein the three dimensional spacer fabric comprises an upper fabric layer, a lower fabric layer, and an intermediate layer of pile threads between the upper fabric layer and the lower fabric layer.

15. The apparatus according to claim 11 wherein the elongate wick comprises hydrophobic fibers.