Apparatuses and methods for negative pressure wound therapy

• US 10,406,037 B2
• Filed: 08/18/2017
• Issued: 09/10/2019
• Est. Priority Date: 12/22/2009
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Albert, Sean, Armstrong, Ed, Beaudoin, Ken, Blackburn, Iain Michael, Bussone, Phil, Crawford, Brendan, Emmerson, Robert, Ewaschuk, Mike, Gianelis, Stephen, Goddard, Andrew, Gordon, Joseph, Guarraia, Mark, Johnson, Tim, Keith-Lucas, Darwin, Linton, Andrew, Nelsen, Dan, Salame, Michael, Stern, Tim, White, Mark
• Primary Examiner(s): Wiest, Philip R
• Application Number:
  US15/681,165
• Publication Number:
  US 20180028365A1
• Time in Patent Office: 753 Days
• CPC Class Codes: A61F 13/02 Adhesive bandages or dressings
• CPC Class Codes: A61F 13/0206 with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
• 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 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00238 characterised by way of knitting or weaving
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0057 with openable cover
• CPC Class Codes: A61F 2013/0074 containing foams
• CPC Class Codes: A61F 2013/00846 with transparent or translucent part
• CPC Class Codes: A61M 1/86 Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece
• CPC Class Codes: A61M 1/90 Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
• CPC Class Codes: A61M 1/912 Connectors between dressing and drainage tube
• 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 1/964 having venting means on or near the dressing
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/7518 bacterial
• CPC Class Codes: A61M 39/20 Closure caps or plugs for connectors or open ends of tubes

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 to improved fluidic connectors or suction adapters for connecting to a wound site, for example using softer, kink-free conformable suction adapters.

Claims

1. A negative pressure wound treatment system, comprising:

a wound cover configured to be positioned over a wound, the wound cover comprising an opening;

a suction adapter having a proximal end and a distal end, the suction adapter attached to the wound cover to provide negative pressure to the wound, the suction adapter comprising;

an elongate liquid impermeable top layer extending from the proximal end to the distal end, wherein the top layer has an enlarged distal end;

an elongate liquid impermeable bottom layer extending from the proximal end to the distal end, wherein the bottom layer has an enlarged distal end comprising one or more apertures configured to fluidically connect the suction adapter to the opening in the wound cover;

an elongate spacer positioned within an elongate channel extending between the top and bottom layers, the spacer extending from a proximal end to a distal end with the distal end of the elongate spacer positioned between the enlarged distal ends of the top layer and bottom layer;

a connector extending into the proximal end of the spacer, the connector being configured to directly or indirectly connect the proximal end of the spacer to a source of negative pressure, wherein the connector is attached to the proximal ends of the top and bottom layers to form a fluid tight connection; and

a fluid-flow restricting element attached to the wound cover over an opening in the wound cover and beneath the enlarged distal end of the bottom layer.

2. The negative pressure wound treatment system of claim 1, wherein the fluid-flow restricting element comprises a one-way valve.

3. The negative pressure wound treatment system of claim 1, wherein the spacer is configured to permit fluid to pass therethrough when the spacer is kinked or folded over.

4. The negative pressure wound treatment system of claim 1, wherein the spacer comprises nylon.

5. The negative pressure wound treatment system of claim 4, wherein the spacer comprises a 3D fabric.

6. The negative pressure wound treatment system of claim 1, wherein the spacer layer comprises a foam.

7. The negative pressure wound treatment system of claim 1, wherein the top and bottom layers are sealed together along respective edges to thereby form the elongate channel.

8. The negative pressure wound treatment system of claim 1, wherein the enlarged distal ends of the top and bottom layers comprise a circular shape.

9. The negative pressure wound treatment system of claim 8, wherein the distal end of the spacer extends past a midpoint of the enlarged distal ends of the top and bottom layers.

10. The negative pressure wound treatment system of claim 1, wherein the enlarged distal ends of the top and bottom layers comprise a teardrop shape.

11. The negative pressure wound treatment system of claim 1, wherein the spacer extends over the one or more apertures of the bottom layer.

12. The negative pressure wound treatment system of claim 1, wherein the spacer has a substantially constant width over the entire length of the spacer.

13. A negative pressure wound treatment system, comprising:

a wound cover configured to be positioned over a wound, the wound cover comprising an opening;

a suction adapter attached to the wound cover and configured to provide negative pressure to the wound, the suction adapter comprising;

an elongate liquid impermeable top layer having a proximal end and an enlarged distal end;

an elongate liquid impermeable bottom layer having a proximal end and an enlarged distal end, wherein the enlarged distal end comprises one or more apertures;

an elongate channel formed between the top and bottom layers, wherein the one or more apertures of the bottom layer, the opening in the wound cover, and the elongate channel form a fluid path for providing the negative pressure to the wound;

an elongate spacer positioned within the elongate channel, the spacer extending from a proximal end to a distal end with the distal end of the elongate spacer positioned between the enlarged distal ends of the top layer and bottom layer;

a connector extending into the proximal end of the spacer, the connector being configured to directly or indirectly connect the proximal end of the spacer to a source of negative pressure, wherein the connector is attached to the proximal ends of the top and bottom layers to form a fluid tight connection; and

a valve positioned in the fluid path.

14. The negative pressure wound treatment system of claim 13, wherein the valve is attached to the wound cover over the opening in the wound cover and beneath the enlarged distal end of the bottom layer.

15. The negative pressure wound treatment system of claim 13, wherein the valve is incorporated into the suction adapter near the distal end of the elongate spacer, and the valve is located in a location above the wound cover.

16. The negative pressure wound treatment system of claim 13, wherein the valve is a one-way valve.

17. The negative pressure wound treatment system of claim 13, wherein the spacer has a substantially constant width over the entire length of the spacer.