# US 11,110,010 B2 · Wound dressing

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- Number: US 11,110,010 B2
- Document ID: US11110010B2
- Status: Granted
- Kind: B2
- Application number: 16/186,393
- Filed: 2018-11-09
- Published: 2019-05-16
- Granted: 2021-09-07
- Earliest claimed: 2007-11-21
- Assignees: Smith & Nephew, Inc.
- Applicants: Smith & Nephew PLC
- Inventors: Edward Yerbury Hartwell
- Web page: https://patentgrep.com/patent/US11110010B2

## CPC

- A61M 1/962: {having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction}
- A61F 13/00063: {comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic (drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00)}
- A61F 13/02: Adhesive bandages or dressings
- A61F 13/0206: with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
- A61F 13/0209: {comprising superabsorbent material}
- A61F 13/022: {having more than one layer with different fluid retention characteristics}
- A61F 13/0226: {characterised by the support layer}
- A61F 13/0246: characterised by the skin-adhering layer
- 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]
- A61M 1/71: {Suction drainage systems (containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90)}
- A61M 1/78: {Means for preventing overflow or contamination of the pumping systems (combined with drainage containers A61M1/60)}
- A61M 1/784: {by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves}
- A61M 1/915: {Constructional details of the pressure distribution manifold}
- A61M 1/964: {having venting means on or near the dressing}
- A61M 1/985: {the dressing itself forming the collection container}
- 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})
- A61F 13/01029: {made of multiple layers}
- A61F 13/01046: {Air-vapor permeability}
- A61F 2013/00246: {in a special way pervious to air or vapours}
- A61F 2013/00536: {for draining or irrigating wounds}
- A61M 1/882: {Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid}
- A61M 2205/7527: liquophilic, hydrophilic
- A61M 2205/7536: allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

A method and apparatus are disclosed for dressing a wound. The apparatus comprises a sealing layer comprising at least one orifice, an absorbent layer over the sealing layer, absorbing wound exude and a liquid impermeable, gas permeable filter layer over the absorbent layer.

## Claims

### Claim 1

An apparatus for the treatment of a wound by applying negative pressure to the wound, the apparatus comprising:
a wound contact layer comprising a plurality of fluid passages through the wound contact layer that allow for fluid to pass there through, wherein the wound contact layer is configured to be in contact with the wound and adhere to skin around the wound;
a porous layer above the wound contact layer;
a first flexible layer above the porous layer comprising a flexible film, wherein the first flexible layer comprises an orifice;
a pump comprising a pump inlet and a pump outlet, wherein the pump inlet is configured to be in a facing relationship with the orifice in the first flexible layer to provide a fluid flow path through the orifice directly into the pump inlet to apply negative pressure to the wound through the porous layer and the wound contact layer and configured to draw fluid from the wound into the porous layer; and
a second flexible layer comprising a flexible film, wherein the second flexible layer is sealed to the first flexible layer to form a chamber enclosing the pump.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the first flexible layer and the second flexible layer comprise a gas and liquid impermeable material.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the second flexible layer comprises a hole.

### Claim 4 (depends on 3)

The apparatus of claim 3, further comprising a filter layer covering the hole in the second flexible layer, wherein gas is configured to pass through the filter layer and hole in the second flexible layer.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the pump outlet is configured to exhaust fluid pumped through the pump.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the gaseous components of the fluid drawn from the wound are exhausted through the second flexible layer.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the second flexible layer and the pump are positioned above the first flexible layer.

### Claim 8 (depends on 1)

The apparatus of claim 1, wherein the wound contact layer comprises an upper surface and a lower surface, and further comprising an adhesive on the lower surface, wherein the adhesive is configured to adhere the wound contact layer to the wound.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the porous layer disposed over the wound contact layer is configured to distribute negative pressure, through the wound contact layer, equally over the entire portion of the wound site being treated.

### Claim 10 (depends on 1)

The apparatus of claim 1, wherein the porous layer is provided directly over the plurality of fluid passages in the wound contact layer.

### Claim 11 (depends on 4)

The apparatus of claim 4, wherein the filter layer comprises an odor trapping material.

### Claim 12 (depends on 4)

The apparatus of claim 4, wherein the filter layer comprises a gas permeable and liquid impermeable material.

### Claim 13 (depends on 1)

The apparatus of claim 1, wherein the pump inlet is in direct contact with the orifice in the first flexible layer.