# US 2016/0354535 A1 · Wound treatment apparatus and method

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- Number: US 2016/0354535 A1
- Document ID: US20160354535A1
- Status: Published application
- Kind: A1
- Application number: 15/177,305
- Filed: 2016-06-08
- Published: 2016-12-08
- Earliest claimed: 2004-04-27
- Assignees: Smith & Nephew, Inc.
- Applicants: Smith & Nephew PLC
- Inventors: Patrick Lewis Blott; Edward Yerbury Hartwell; Julian Lee-Webb; Derek Nicolini; Clare Green; Robin Paul Martin
- Web page: https://patentgrep.com/patent/US20160354535A1

## CPC

- 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]
- A61N 5/025: {Warming the body, e.g. hyperthermia treatment}
- 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
- A61M 1/71: {Suction drainage systems (containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90)}
- 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 1/915: {Constructional details of the pressure distribution manifold}
- A61M 1/916: {specially adapted for deep wounds}
- A61M 1/92: {with liquid supply means}
- A61M 1/966: {having a pressure sensor on or near the dressing}
- A61M 3/0283: {with at least two inner passageways, a first one for irrigating and a second for evacuating (suction-irrigation systems A61M1/77; aspiration tips with fluid supply means A61M1/85; for negative pressure wound therapy A61M1/92)}
- A61M 5/14: Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M 5/44: having means for cooling or heating the devices or media
- 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})
- A61M 35/00: Devices for applying media, e.g. remedies, on the human body (devices for handling toiletry or cosmetic substances A45D; absorbent pads, e.g. swabs, A61F13/15)
- A61N 5/0616: {Skin treatment other than tanning}
- A61N 5/0625: {Warming the body, e.g. hyperthermia treatment}
- A61F 7/034: {Flameless}
- A61F 2007/0069: {with return means}
- A61F 2007/0075: {using a Peltier element, e.g. near the spot to be heated or cooled}
- A61F 2013/00174: {possibility of applying pressure}
- A61F 2013/00221: {biodegradable, non-irritating}
- A61F 2013/00357: {implanted wound fillings or covers}
- A61F 2013/00536: {for draining or irrigating wounds}
- A61F 2013/0054: {for deep wounds}
- A61M 1/964: {having venting means on or near the dressing}
- A61M 2205/364: by chemical reaction
- A61M 2205/3653: by Joule effect, i.e. electric resistance
- A61M 2205/368: by electromagnetic radiation, e.g. IR waves
- A61M 2205/3686: microwaves
- A61N 2005/0645: {Applicators worn by the patient}
- A61N 2005/0659: {infrared}
- 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)
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- 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 aspirating, irrigating and/or cleansing wounds is provided. The apparatus and method include one or more of the following: simultaneous aspiration and irrigation of the wound, supplying of thermal energy to fluid circulated through the wound; supplying physiologically active agents to the wound; a biodegradable scaffold in contact with the wound bed; and application of stress or flow stress to the wound bed.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

A system for delivering fluid to a wound dressing, the system comprising:
a negative pressure source coupled to a wound dressing;
a fluid flow device in fluid communication with the wound dressing, the fluid flow device configured to control flow of fluid to the wound dressing;
a reservoir coupled to the negative pressure source and in fluid communication with the wound dressing;
a bleed valve connected to the reservoir;
a valve between the wound dressing and the reservoir; and
a pressure sensor coupled to the wound dressing, the pressure sensor configured to send a control signal when the pressure sensor detects a predetermined pressure at the wound dressing,
wherein the negative pressure source is configured to evacuate the wound dressing, the vent is configured to bleed the reservoir, the valve is configured to restrict fluid flow to the reservoir, and the fluid flow device is configured to deliver fluid to the wound dressing responsive to the control signal from the pressure sensor.

### Claim 8 (depends on 7)

The system of claim 7, wherein the fluid flow device is a pump.

### Claim 9 (depends on 8)

The system of claim 8, wherein the pump is a variable-speed pump.

### Claim 10 (depends on 7)

The system of claim 7, wherein the fluid flow device is a peristaltic pump.

### Claim 11 (depends on 7)

The system of claim 7, wherein the fluid flow device is a centrifugal pump.

### Claim 12 (depends on 7)

The system of claim 7, wherein the fluid flow device is a valve.

### Claim 13 (depends on 7)

The system of claim 7, wherein the fluid flow device is a motorized valve.

### Claim 14 (depends on 7)

The system of claim 7, wherein the predetermined pressure is approximately 0.9 atm.

### Claim 15 (depends on 7)

The system of claim 7, wherein the predetermined pressure is a negative pressure of no more than 0.9 atm.

### Claim 16

A method for delivering fluid to a wound therapy dressing, the method comprising:
creating a negative pressure on the wound therapy dressing;
closing a valve to restrict fluid flow from the wound therapy dressing to a negative pressure source;
delivering fluid to the wound therapy dressing while the valve is closed;
monitoring pressure at the wound therapy dressing via a pressure sensor;
achieving a desired volume of the fluid in the wound therapy dressing by restricting fluid delivery responsive to the monitored pressure;
providing a reservoir between the negative pressure source and the wound therapy dressing;
deactivating the negative pressure source prior to delivering fluid to the wound therapy dressing; and
venting the reservoir to atmosphere responsive to the monitored pressure.

### Claim 17 (depends on 16)

The method of claim 16, wherein restricting fluid delivery comprises varying speed of a variable-speed pump or operating a valve.

### Claim 18 (depends on 16)

The method of claim 16, wherein restricting fluid delivery comprises closing a second valve between a fluid flow device and the wound therapy dressing.

### Claim 19 (depends on 16)

The method of claim 16, further comprising achieving pressure at the wound therapy dressing of approximately 0.9 atm.

### Claim 20 (depends on 16)

The method of claim 16, further comprising achieving negative pressure at the wound therapy dressing of no more than 0.9 atm.

### Claim 21

A system for delivering fluid to a wound dressing, the system comprising:
a negative pressure source configured to aspirate fluid from a wound dressing;
a fluid movement device configured to be in fluid communication with the wound dressing, the fluid movement device comprising a control device configured to control flow through the fluid movement device;
a collection vessel configured to be coupled to the negative pressure source and configured to be in fluid communication with the wound dressing;
a bleed valve connected to the collection vessel and configured to bleed fluid from the collection vessel;
a valve configured to be positioned between the wound dressing and the collection vessel, the valve configured to regulate fluid flow from the wound to the collection vessel; and
a pressure sensor configured to be coupled to the wound dressing, the pressure sensor configured to send a control signal when the pressure sensor detects a predetermined pressure under the wound dressing,
wherein the control device is configured to control delivery of fluid by the fluid movement device to the wound dressing responsive to the control signal from the pressure sensor.

### Claim 22 (depends on 21)

The system of claim 21, wherein the fluid movement device comprises a pump.

### Claim 23 (depends on 22)

The system of claim 22, wherein the pump comprises a variable-speed pump.

### Claim 24 (depends on 21)

The system of claim 21, wherein the fluid movement device comprises a peristaltic pump.

### Claim 25 (depends on 21)

The system of claim 21, wherein the fluid movement device comprises a centrifugal pump.

### Claim 26 (depends on 21)

The system of claim 21, wherein the fluid movement device comprises a valve.

### Claim 27 (depends on 21)

The system of claim 21, wherein the fluid movement device comprises a motorized valve.

### Claim 28 (depends on 21)

The system of claim 21, wherein the predetermined pressure is approximately 0.9 atm.

### Claim 29 (depends on 21)

The system of claim 21, wherein the predetermined pressure is a negative pressure of no more than 0.9 atm.

### Claim 30

A method for delivering fluid to a wound therapy dressing, the method comprising:
creating a negative pressure under the wound therapy dressing;
closing a valve to restrict fluid flow from the wound therapy dressing to the negative pressure source;
delivering fluid to the wound therapy dressing while the valve is closed;
monitoring pressure under the wound therapy dressing;
achieving a desired pressure under the wound therapy dressing by restricting fluid delivery responsive to the monitored pressure;
deactivating the negative pressure source prior to delivering fluid to the wound therapy dressing; and
bleeding fluid from a collection vessel positioned between the negative pressure source and the wound therapy dressing responsive to the monitored pressure.

### Claim 31 (depends on 30)

The method of claim 30, wherein restricting fluid delivery comprises varying speed of a variable-speed pump or operating a valve.

### Claim 32 (depends on 30)

The method of claim 30, wherein restricting fluid delivery comprises closing a second valve between a fluid movement device and the wound therapy dressing.

### Claim 33 (depends on 30)

The method of claim 30, further comprising achieving pressure under the wound therapy dressing of approximately 0.9 atm.

### Claim 34 (depends on 30)

The method of claim 30, further comprising achieving negative pressure under the wound therapy dressing of no more than 0.9 atm.