# US 11,298,453 B2 · Apparatus and method for wound cleansing with actives

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- Number: US 11,298,453 B2
- Document ID: US11298453B2
- Status: Granted
- Kind: B2
- Application number: 16/142,411
- Filed: 2018-09-26
- Published: 2019-03-28
- Granted: 2022-04-12
- Earliest claimed: 2003-10-28
- Assignees: Smith & Nephew, Inc.
- Applicants: Smith & Nephew PLC
- Inventors: Patrick Lewis Blott; Clare Green; Bryan Greener; Edward Yerbury Hartwell; Julian Lee-Webb; Robin Paul Martin; Derek Nicolini; Tina Michelle Walker
- Web page: https://patentgrep.com/patent/US11298453B2

## CPC

- 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 1/90: {Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing}
- A61M 1/916: {specially adapted for deep wounds}
- A61M 35/30: {Gas therapy for therapeutic treatment of the skin}
- A61M 1/94: {with gas supply means}
- 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)}

## Abstract

An apparatus and method for cleansing and applying therapy or prophylaxis to wounds, in which irrigant fluid, which may contain a physiologically active material, and wound exudate from the dressing are moved by a device for moving fluid through a flow path which passes through the dressing. A means for fluid cleansing may also be provided to recirculate fluid back to the dressing. The cleansing means removes materials deleterious to wound healing, and the cleansed fluid, still containing materials that are beneficial in promoting wound healing, is returned to the wound bed. The apparatus may also provide means for distributing such materials in a precise and time-controlled manner over the wound bed. It may also contain a means for providing simultaneous aspiration and irrigation of the wound.

## Claims

### Claim 1

An apparatus for aspirating, irrigating and/or cleansing wounds, comprising:
a conformable wound dressing having a backing layer configured to form a relatively fluid-tight seal or closure over a wound;
a physiologically active agent source configured to connect by a fluid supply tube to the wound dressing, wherein the fluid supply tube is configured to deliver a physiologically active agent comprising oxygen from the physiologically active agent source to the wound;
a negative pressure source configured to apply negative pressure to an interior of the wound dressing and to the wound; and
wherein the physiologically active agent is configured to be supplied to the wound dressing from the physiologically active agent source via the fluid supply tube while fluid is simultaneously aspirated by the negative pressure source and desired negative pressure is applied to the wound.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising a wound contact layer.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the wound contact layer comprises a biodegradable material.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein the biodegradable material comprises a cellulose derivative.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the physiologically active agent source comprises a reservoir.

### Claim 6 (depends on 1)

The apparatus of claim 1, further comprising a controller.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the controller is configured to control delivery of negative pressure.

### Claim 8 (depends on 6)

The apparatus of claim 6, wherein the controller is configured to control delivery of the physiologically active agent.

### Claim 9 (depends on 7)

The apparatus of claim 7, wherein negative pressure is delivered continuously.

### Claim 10 (depends on 7)

The apparatus of claim 7, wherein negative pressure is delivered intermittently.

### Claim 11 (depends on 6)

The apparatus of claim 6, wherein the controller is configured to switch between a first setting where a physiologically active agent is delivered to the wound and a second setting where negative pressure is delivered to the wound.

### Claim 12 (depends on 8)

The apparatus of claim 8, wherein the physiologically active agent is delivered in a plurality of supply cycles.

### Claim 13 (depends on 6)

The apparatus of claim 6, wherein the controller is configured to control delivery of negative pressure and delivery of the physiologically active agent.