Flexible reduced pressure treatment appliance

• US 8,449,509 B2
• Filed: 07/07/2010
• Issued: 05/28/2013
• Est. Priority Date: 04/05/2004
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Bluesky Medical Group Inc. (Smith & Nephew PLC)
• Inventors: Weston, Richard Scott
• Primary Examiner(s): HAND, MELANIE JO
• Application Number:
  US12/832,031
• Publication Number:
  US 20100274207A1
• Time in Patent Office: 1,056 Days
• Field of Search: 604/304, 604/305, 604/307, 604/313
• US Class Current: 604/313
• 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 1/60 Containers for suction drainage, adapted to be used with an external suction source containers not adapted for subjection to vacuum A61M1/69
• CPC Class Codes: A61M 1/68 Containers incorporating a flexible member creating suction
• CPC Class Codes: A61M 1/682 bulb-type, e.g. nasal mucus aspirators
• CPC Class Codes: A61M 1/782 using valves with freely moving parts, e.g. float valves
• CPC Class Codes: A61M 1/784 by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
• CPC Class Codes: A61M 1/962 having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
• CPC Class Codes: A61M 1/98 Containers specifically adapted for negative pressure wound therapy
• CPC Class Codes: A61M 2205/075 Bulb type

Abstract

A wound treatment appliance is provided for treating all or a portion of a wound. In some embodiments, the appliance comprises an impermeable flexible overlay that covers all or a portion of the wound for purposes of applying a reduced pressure to the covered portion of the wound. In other embodiments, the impermeable flexible overlay comprises suction assistance means, such as channels, which assist in the application of reduced pressure to the area of the wound and removal of exudate from the wound. In other embodiments, the wound treatment appliance also includes a vacuum system to supply reduced pressure to the wound in the area under the flexible overlay. In yet other embodiments, the wound treatment appliance also includes wound packing means to prevent overgrowth of the wound or to encourage growth of the wound tissue into an absorbable matrix comprising the wound packing means. In still other embodiments, the appliance may include a suction drain. In other embodiments, the appliance may include a collection chamber to collect and store exudate from the wound. In yet other embodiments, a suction bulb may be used to provide a source of reduced pressure to an impermeable overlay that covers all or a portion of the wound. Finally, methods are provided for using various embodiments of the wound treatment appliance.

Claims

1. A wound treatment apparatus comprising:

a flexible overlay with a circular shape sized to be placed over an area of the wound to be treated, the flexible overlay comprising a plurality of channels extending radially outward from a central portion of the flexible overlay,

wherein the channels assist in the application of reduced pressure to the area of the wound and removal of exudate from the wound, wherein the plurality of channels are connected only at the central portion, and wherein each of the plurality of channels is substantially enclosed and includes one or more perforations formed therein along a length thereof; and

a conduit configured to apply reduced pressure to the wound through the channels in the flexible overlay.

2. The wound treatment apparatus of claim 1, wherein the conduit is connected to a vacuum pump.

3. The wound treatment apparatus of claim 1, wherein the channels are molded into the flexible overlay.

4. The wound treatment apparatus of claim 1, wherein the channels are raised above the surface of the flexible overlay.

5. The wound treatment apparatus of claim 1, wherein the flexible overlay is constructed from an at least partially gas-permeable material.

6. The wound treatment apparatus of claim 1, wherein the apparatus additionally comprises a port adapted to receive the conduit.

7. The wound treatment apparatus of claim 1, wherein the apparatus additionally comprises a wound packing material under the flexible overlay.

8. The wound treatment apparatus of claim 7, wherein the wound packing material is foam.

9. A method of treating a wound, comprising:

providing a flexible overlay configured to fit an area of the wound to be treated, wherein the flexible overlay has a circular shape sized to be placed over the area of the wound to be treated and comprises a plurality of channels extending radially outward from a central portion of the flexible overlay, wherein the plurality of channels are connected only at the central portion, and wherein each of the plurality of channels is substantially enclosed and includes one or more perforations formed therein along a length thereof;

positioning the flexible overlay over the area of a wound to be treated such that the channels are in fluid communication with the area of the wound to be treated;

operably connecting a source of reduced pressure to the flexible overlay so as to supply reduced pressure and remove wound exudate from the area of the wound to be treated, wherein the channels assist in the application of reduced pressure to the area of the wound and removal of exudate from the wound; and

maintaining the reduced pressure until the area of the wound to be treated has progressed toward a desired stage of healing.

10. The method of claim 9, further comprising cutting the flexible overlay to adapt the flexible overlay for use prior to positioning the flexible overlay.

11. The method of claim 9, further comprising placing wound packing material into the wound.

12. The method of claim 9, further comprising collecting the wound exudate in a container.

13. The method of claim 12, further comprising shutting off the application of reduced pressure if the volume of exudate collected in the container exceeds a predetermined amount.

14. A wound treatment apparatus for use in a system for the treatment of wounds with reduced pressure, the apparatus comprising:

a first dressing member comprising a cup-shaped portion having a continuous wall and a port at a top end of the cup-shaped portion, the port configured to be fluidically connected to a source of reduced pressure;

an opening at a base end of the cup-shaped portion configured to face toward a wound site to be treated with reduced pressure; and

a plurality of flow channels formed in the continuous wall of the cup-shaped portion of the first dressing member extending from the base end to the top end of the cup-shaped portion, the channels comprising concave channels suitable for channeling wound exudate from the wound site toward the source of reduced pressure.

15. The apparatus of claim 14, wherein the flow channels converge toward a central port at the top end of the cup-shaped portion.

16. The apparatus of claim 14, in combination with a wound packing material configured for placement at a wound.

17. The apparatus of claim 14, in combination with tissue protection material configured to be placed over the wound site.

18. The apparatus of claim 14, in combination with a source of reduced pressure further includes a mechanism to shut off the application of reduced pressure to the wound.

19. The apparatus of claim 18, further comprising a mechanism configured to automatically shut off the application of reduced pressure to the wound if the volume of exudate from the wound exceeds a predetermined amount.

20. A method of delivering reduced pressure to a wound, comprising:

connecting a cup-shaped portion to a source of reduced pressure via at least one tubing member;

wherein the cup-shaped portion comprises;

a top end having a port configured to be fluidically connected via the at least one tubing member to the source of reduced pressure,

a base end with an opening configured to face toward the wound; and

a continuous wall portion extending between the top end and the base end;

applying reduced pressure to the wound via the cup-shaped portion; and

channeling reduced pressure along a plurality of channels formed in the continuous wall portion of the cup-shaped portion when said reduced pressure is applied.

21. The method of claim 20, wherein the reduced pressure is applied through tissue protection material placed over the wound.

22. The method of claim 20, wherein the reduced pressure is applied through wound packing material placed between the wound and under the cup-shaped portion.

23. The method of claim 20, further comprising collecting wound exudate in a container.