Device and method for wound therapy

• US 10,391,212 B2
• Filed: 09/22/2017
• Issued: 08/27/2019
• Est. Priority Date: 05/11/2006
• Status: Active Grant

• Current Assignee: Smith+Nephew, Inc.
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Joshi, Ashok V., Gordon, John Howard, Bhavaraju, Sai, Dayton, Troy C., Heiser, Jeremy
• Primary Examiner(s): Kidwell, Michele M
• Assistant Examiner(s): Treyger, Ilya Y
• Application Number:
  US15/713,479
• Publication Number:
  US 20180028729A1
• Time in Patent Office: 704 Days
• 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 13/0213 the fluid retention member being a layer of hydrocolloid, gel forming material
• CPC Class Codes: A61F 13/0243 characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
• 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: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/743 by changing the cross-section of the line, e.g. flow regulating valves A61M1/7413 takes precedence
• CPC Class Codes: A61M 1/78 Means for preventing overflow or contamination of the pumping systems combined with drainage containers A61M1/60
• CPC Class Codes: A61M 1/784 by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
• CPC Class Codes: A61M 1/882 Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid
• 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 1/915 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 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 2205/13 with means for the detection of operative contact with patient, e.g. lip sensor
• CPC Class Codes: A61M 2205/15 : Detection of leaks
• CPC Class Codes: A61M 2205/7509 : for virus
• CPC Class Codes: A61M 2205/7518 : bacterial
• 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 wound therapy device is disclosed. The wound therapy device may include a housing for covering at least a portion of a wound and for sealing to a body surface of a patient. The housing may also include a liquid collector for retaining liquid therein and a vacuum connection for coupling to a vacuum source. The vacuum connection may be in gaseous communication with the liquid collector. The vacuum connection may be separated from the liquid collector by a liquid barrier.

Claims

1. A wound dressing comprising:

a wound interface layer;

a flexible wound cover configured to cover at least a portion of a wound;

a first region comprising an absorbent layer positioned between the flexible wound cover and the wound interface layer;

a second region comprising a source of negative pressure positioned over the wound interface layer and configured to deliver a reduced pressure to the wound; and

a liquid barrier configured to prevent liquid from reaching the source of negative pressure;

wherein the first region and the second region are positioned over the wound interface layer with the second region offset from the first region; and

wherein the flexible wound cover covers at least the first region.

2. The wound dressing of claim 1, wherein the second region is laterally offset from the first region.

3. The wound dressing of claim 1, wherein the second region is vertically offset from the first region.

4. The wound dressing of claim 1, further comprising a moisture disperser layer positioned above the wound interface layer, the moisture disperser layer configured to distribute liquid.

5. The wound dressing of claim 4, wherein the moisture disperser layer is positioned between the absorbent layer and the wound interface layer at least in the first region.

6. The wound dressing of claim 1, further comprising a three-dimensional knit spacer fabric beneath the absorbent layer at least in the first region.

7. The wound dressing of claim 1, wherein the flexible wound cover covers at least a portion of the second region.

8. The wound dressing of claim 1, wherein the liquid barrier comprises a filter.

9. The wound dressing of claim 1, wherein the liquid barrier comprises a gas permeable material.

10. The wound dressing of claim 1, wherein the flexible wound cover covers the source of negative pressure.

11. The wound dressing of claim 10, wherein the source of negative pressure comprises an inlet and an outlet, the outlet configured to vent gas outside the flexible wound cover.

12. The wound dressing of claim 11, wherein the inlet comprises a hydrophobic filter.

13. The wound dressing of claim 1, wherein the dressing is configured to locate the source of negative pressure at a location away from the wound.

14. The wound dressing of claim 1, wherein the dressing comprises a pump module in the second region that encloses the source of negative pressure and a power source.

15. The wound dressing of claim 1, wherein the source of negative pressure is a vacuum pump.

16. The wound dressing of claim 11, wherein the outlet comprises a filter.