# US 10,765,783 B2 · Dressings and methods for treating a tissue site on a patient

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- Number: US 10,765,783 B2
- Document ID: US10765783B2
- Status: Granted
- Kind: B2
- Application number: 15/273,991
- Filed: 2016-09-23
- Published: 2017-03-23
- Granted: 2020-09-08
- Earliest claimed: 2010-04-16
- Assignees: KCI Licensing, Inc.
- Applicants: KCI Licensing, Inc.
- Inventors: Christopher Brian Locke; Timothy Mark Robinson; Aidan Marcus Tout
- Web page: https://patentgrep.com/patent/US10765783B2

## CPC

- A61M 1/74: {Suction control (underwater drainage A61M1/61)}
- 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 13/0223: {characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution}
- A61F 13/0226: {characterised by the support layer}
- A61F 13/0266: {especially adapted for wound covering/occlusive dressings}
- 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 1/60: {Containers for suction drainage, adapted to be used with an external suction source (containers not adapted for subjection to vacuum A61M1/69)}
- A61M 1/64: {Containers with integrated suction means (containers not adapted for subjection to vacuum A61M1/69)}
- A61M 1/71: {Suction drainage systems (containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90)}
- A61M 1/784: {by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves}
- A61M 1/85: {with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants (for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208)}
- A61M 1/884: {Draining devices provided with means for filtering out the harmless water content before discarding the drainage container}
- A61M 1/94: {with gas supply means}
- A61M 1/962: {having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction}
- A61M 1/964: {having venting means on or near the dressing}
- A61M 1/98: {Containers specifically adapted for negative pressure wound therapy}
- A61M 1/985: {the dressing itself forming the collection container}
- A61F 2013/00119: {elastic}
- A61F 2013/00246: {in a special way pervious to air or vapours}
- A61F 2013/00536: {for draining or irrigating wounds}
- A61F 2013/0074: {containing foams}
- A61M 1/77: {Suction-irrigation systems (aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463)}
- A61M 1/80: {Suction pumps (A61M1/64, A61M1/71, A61M60/00 take precedence)}
- 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

Dressings, systems, and methods for treating a tissue site on a patient involve allowing liquids from the tissue site or a priming fluid to evaporate and exit the dressing through a liquid-impermeable, vapor-permeable membrane. The dressing is able to process more liquids than would otherwise be possible without evaporation and potentially to create reduced pressure. Other dressings, systems, and methods are disclosed.

## Claims

### Claim 1

A dressing for treating a tissue site, the dressing comprising:
a covering configured to be positioned over the tissue site to create a sealed space, the covering comprising:
a film having a periphery and a center, an adhesive disposed on the periphery of the film, and the center of the film being free of the adhesive and configured to permit evaporation of water vapor through the center: a manifold configured to be positioned over the covering; and a drape configured to be positioned over the manifold and further configured to have a first aperture configured to be fluidly coupled to a forced-air device, and at least one second aperture configured to be fluidly coupled to an ambient environment to generate a fluid flow between the first aperture and the at least one second aperture in response to operation of the forced-air device.

### Claim 2 (depends on 1)

The dressing of claim 1, wherein the at least one second aperture comprises a plurality of apertures.

### Claim 3 (depends on 2)

The dressing of claim 2, wherein the plurality of apertures are circumferentially spaced around a periphery of the drape.

### Claim 4 (depends on 1)

The dressing of claim 1, wherein the second portion comprises a membrane.

### Claim 5 (depends on 1)

The dressing of claim 1, further comprising a one-way valve coupled to the film, the one-way valve permitting fluid flow from the sealed space through the covering.

### Claim 6 (depends on 1)

The dressing of claim 1, further comprising a pressure-regulating valve coupled to the film, the pressure-regulating valve permitting fluid flow into the sealed space through the film.

### Claim 7 (depends on 6)

The dressing of claim 6, wherein the pressure-regulating valve permits fluid flow into the sealed space in response to a maximum reduced pressure in the sealed space.

### Claim 8 (depends on 1)

The dressing of claim 1, further comprising a wound interface disposed adjacent the tissue site in the sealed space.

### Claim 9 (depends on 1)

The dressing of claim 1, further comprising an absorbent layer disposed adjacent the tissue site in the sealed space.