Apparatuses and methods for negative pressure wound therapy

• US 9,907,703 B2
• Filed: 05/22/2013
• Issued: 03/06/2018
• Est. Priority Date: 05/23/2012
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Allen, Julie, Askem, Ben Alan, Collinson, Sarah Jenny, Gowans, Philip, Mehta, Steven Carl, Nicolini, Derek, Zagrabski, Carol
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): Mensh, Andrew J
• Application Number:
  US14/403,036
• Publication Number:
  US 20150141941A1
• Time in Patent Office: 1,749 Days
• Field of Search: 604290, 604313, 604319
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• 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 2013/00238 characterised by way of knitting or weaving
• CPC Class Codes: A61M 1/64 Containers with integrated suction means containers not adapted for subjection to vacuum A61M1/69
• CPC Class Codes: A61M 1/79 Filters for solid matter specially adapted for dental use A61C17/065
• CPC Class Codes: A61M 1/86 Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece
• CPC Class Codes: A61M 1/913 having a bridging element for transferring the reduced pressure from the connector to the dressing
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• 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 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes

Abstract

Disclosed herein are several embodiments of a negative pressure appliance and methods of using the same in the treatment of wounds. Some embodiments are directed towards wound dressings comprising a liquid and gas permeable transmission layer, an absorbent layer for absorbing wound exudate, the absorbent layer overlying the transmission layer, a gas impermeable cover layer overlying the absorbent layer and comprising a first orifice, wherein the cover layer is moisture vapor permeable. Some embodiments are directed to improved fluidic connectors or suction adapters for connecting to a wound site, for example using softer, kink-free conformable suction adapters.

Claims

1. An apparatus to provide suction to a wound site comprising:

a fluidic connector comprising;

a spacer layer comprising a proximal end, an elongate middle portion, a distal end, and a fold at the proximal end, wherein at the fold a length of the spacer layer is folded onto itself thereby forming two folded layers;

a top layer constructed from a liquid impermeable material provided over the spacer layer;

a bottom layer constructed from a liquid impermeable material provided below the spacer layer, wherein the top layer and the bottom layer substantially enclose the spacer layer;

one or more apertures in the bottom layer beneath the distal end of the spacer layer;

a filter positioned below the distal end of the spacer layer adjacent the one or more apertures, wherein the filter is positioned between the distal end of the spacer layer and the bottom layer; and

a conduit comprising a proximal end and a distal end, wherein conduit is in fluid communication with the proximal end of the spacer layer, and wherein a length of the conduit at the distal end of the conduit rests between the two folded layers; and

a wound dressing comprising;

an absorbent layer for absorbing wound exudate from the wound site; and

a cover layer overlying the absorbent layer and comprising an opening;

wherein the distal end of the bottom layer of the fluidic connector is adhered to the cover layer of the wound dressing with the aperture in the bottom layer being positioned over the opening in the cover layer, and wherein the filter substantially prevents the wound exudate from escaping the wound dressing.

2. The apparatus of claim 1, wherein the distal end of the spacer layer is enlarged relative to a width of the elongate middle portion and a width of the proximal end.

3. The apparatus of claim 1, wherein the spacer layer comprises one of a 3D knitted or 3D fabric material, foam, a porous material and non-woven material.

4. The apparatus of claim 1, wherein the spacer layer comprises an opening through one or both of the two folded layers, and wherein the distal end of the conduit extends into the opening with the length of the distal end of the conduit resting between the two folded layers.

5. The apparatus of claim 4, wherein the opening comprises an elongated slot in a proximal end of the fold in the spacer layer.

6. The apparatus of claim 4, wherein the opening comprises a channel extending away from a proximal end of the fold in the spacer layer.

7. The apparatus of claim 1, wherein the conduit extends proximally from the proximal end of the spacer layer, with a portion of the conduit extending between the top and bottom layers.

8. The apparatus of claim 7, wherein the conduit has one or more circumferential ribs to facilitate connection to the top and bottom layers.

9. The apparatus of claim 1, wherein a distal end of the bottom layer comprises adhesive.

10. The apparatus of claim 1, wherein an elongate middle portion of the bottom layer comprises adhesive.

11. The apparatus of claim 1, further comprising an extension conduit configured to be removably connected to the conduit in fluid communication with the proximal end of the spacer layer.

12. The apparatus of claim 1, wherein the top layer is adhered to the bottom layer to form an elongate channel holding the spacer layer therein.

13. The apparatus of claim 1, wherein the filter has a perimeter shape corresponding in shape to the distal end of the spacer layer.

14. The apparatus of claim 1, wherein the distal end of the spacer layer has a circular shape.

15. The apparatus of claim 1, wherein the distal ends of the top and bottom layers have an enlarged distal end similar in shape to an enlarged distal end of the spacer layer.

16. The apparatus of claim 1, wherein the spacer layer has a substantially rectangular cross-sectional dimension.

17. The apparatus of claim 1, wherein the spacer layer is adhered to at least one of the top and bottom layers.

18. The apparatus of claim 1, wherein the wound dressing comprises a wound contact layer comprising perforated film for transmission of the suction to the wound site.

19. The apparatus of claim 18, wherein the cover layer is attached to the wound contact layer around a perimeter, thereby defining an interior space comprising the absorbent layer.

20. The apparatus of claim 1, wherein the filter is liquid-impermeable and gas permeable.

21. The apparatus of claim 1, wherein the filter comprises an oleophobic filter membrane.

22. The apparatus of claim 1, wherein the length of the distal end of the conduit is adhered to the two folded layers.