# US 11,992,601 B2 · System for providing continual drainage in negative pressure wound therapy

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- Number: US 11,992,601 B2
- Document ID: US11992601B2
- Status: Granted
- Kind: B2
- Application number: 17/087,088
- Filed: 2020-11-02
- Published: 2021-05-20
- Granted: 2024-05-28
- Earliest claimed: 2009-06-01
- Assignees: Smith & Nephew, Inc.
- Applicants: Smith & Nephew, Inc.
- Inventors: Mark A. Vess; Chirag B. Shah; Richard M. Braga; David R. Swisher
- Web page: https://patentgrep.com/patent/US11992601B2

## CPC

- A61M 1/964: {having venting means on or near the dressing}
- A61F 13/023: {wound covering film layers without a fluid retention layer}
- 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 1/86: {Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece}
- A61M 1/912: {Connectors between dressing and drainage tube}
- A61M 1/98: {Containers specifically adapted for negative pressure wound therapy}
- A61F 2013/00089: {Wound bandages (A61F2013/00361 takes precedence;)}
- A61F 2013/00174: {possibility of applying pressure}
- A61M 1/784: {by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves}
- A61M 1/88: {Draining devices having means for processing the drained fluid, e.g. an absorber (for liposuction A61M1/892)}
- A61M 2205/583: by visual feedback
- A61M 2205/7518: bacterial
- 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 system for subatmospheric pressure therapy in connection with healing a wound is provided. The system includes a wound dressing cover dimensioned for positioning relative to a wound bed of a subject to establish a reservoir over the wound bed in which subatmospheric pressure may be maintained, a subatmospheric pressure mechanism including, a housing, a vacuum source disposed in the housing, and a collection canister in fluid communication with the vacuum source. The system further includes an exudate conduit in fluid communication with the wound dressing and the collection canister for collecting exudate removed from the reservoir and deposited in the collection canister under influence of the vacuum source and a vent conduit in fluid communication with the collection canister and the wound dressing for introducing air into the reservoir to facilitate flow of exudate through the exudate conduit.

## Claims

### Claim 1

A system for treating a wound site with reduced pressure, the system comprising:
a wound filler configured to be placed proximate to the wound site;
a cover layer configured to cover the wound filler;
a conduit comprising a first segment comprising a primary lumen and a second segment integral with the first segment comprising a secondary lumen; and
a port, the port comprising:
a port body having a cavity, the cavity configured to be coupled to the wound filler through an aperture in the cover layer,
wherein:
the port is configured to couple the primary lumen to the cavity within the port,
the port body has a second passageway configured to couple the secondary lumen to the wound filler, the second passageway configured to fluidly isolate the secondary lumen from direct pneumatic coupling with the cavity; and
the second passageway extends at least from the secondary lumen past a bottom surface of the port.

### Claim 2 (depends on 1)

The system according to claim 1, wherein the primary lumen has a larger diameter than the secondary lumen.

### Claim 3 (depends on 1)

The system according to claim 1, wherein the cavity is larger than the second passageway.

### Claim 4 (depends on 1)

The system according to claim 1, comprising a reduced pressure source configured to be coupled to the primary lumen.

### Claim 5 (depends on 1)

The system according to claim 1, wherein the port has a base configured to be coupled with the cover layer and extend over a larger area of the cover layer than a portion of the port adjacent to the base.

### Claim 6 (depends on 1)

The system according to claim 1, wherein the second passageway comprises an elbow within the port.

### Claim 7 (depends on 1)

The system according to claim 1, wherein a fluid flow path through at least the secondary lumen and the second passageway is configured to extend into the wound when the port is attached to the cover layer.

### Claim 8 (depends on 1)

The system according to claim 1, wherein a fluid flow path through at least the secondary lumen and the second passageway includes a filter at an end opposite from an end that extends beyond a wound-facing surface of the port.

### Claim 9 (depends on 1)

The system according to claim 1, wherein a fluid flow path through at least the secondary lumen and the second passageway includes a puncturing tip at an end that extends beyond a wound-facing surface of the port.

### Claim 10 (depends on 1)

The system according to claim 1, wherein a fluid flow path through at least the secondary lumen and the second passageway comprises a valve operable to control a flow of fluid into the wound.

### Claim 11 (depends on 10)

The system according to claim 10, wherein the valve is a needle valve.

### Claim 12 (depends on 1)

The system according to claim 1, wherein the port is circular, and wherein a fluid flow path through at least the secondary lumen and the second passageway is placed around an interior circular portion of the port.

### Claim 13 (depends on 1)

The system according to claim 1, wherein the wound filler further comprises a wound packing material configured to be disposed in the wound, and wherein a fluid flow path through at least the secondary lumen and the second passageway is configured to extend into the wound packing material when the port is attached to the cover layer.

### Claim 14 (depends on 1)

The system according to claim 1, wherein a fluid flow path through at least the secondary lumen and the second passageway is configured to introduce atmospheric air under the cover layer.

### Claim 15

A system for treating a wound site with reduced pressure, the system comprising:
a wound filler configured to be placed proximate to the wound site;
a cover layer configured to cover the wound filler;
a conduit comprising a first segment comprising a primary lumen and a second segment integral with the first segment comprising a secondary lumen; and
a port, the port comprising:
a port body having a cavity, the cavity configured to be coupled to the wound filler through an aperture in the cover layer,
wherein:
the port is configured to couple the primary lumen to the cavity within the port,
the port body has a second passageway configured to couple the secondary lumen to the wound filler, the second passageway configured to fluidly isolate the secondary lumen from direct pneumatic coupling with the cavity; and
a fluid flow path through at least the secondary lumen and the second passageway is configured to extend into the wound when the port is attached to the cover layer.

### Claim 16 (depends on 15)

The system according to claim 15, wherein the primary lumen has a larger diameter than the secondary lumen.

### Claim 17 (depends on 15)

The system according to claim 15, comprising a reduced pressure source configured to be coupled to the primary lumen.

### Claim 18 (depends on 15)

The system according to claim 15, wherein the second passageway comprises an elbow within the port.

### Claim 19 (depends on 15)

The system according to claim 15, wherein the port has a base configured to be coupled with the cover layer and extend over a larger area of the cover layer than a portion of the port adjacent to the base.

### Claim 20 (depends on 15)

The system according to claim 15, wherein the fluid flow path through at least the secondary lumen and the second passageway includes a filter at an end opposite from an end that extends beyond a wound-facing surface of the port.