# US 2019/0167865 A1 · Suction device and dressing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167865 A1 - Document ID: US20190167865A1 - Status: Published application - Kind: A1 - Application number: 16/201,508 - Filed: 2018-11-27 - Published: 2019-06-06 - Earliest claimed: 2007-11-21 - Assignees: T.J.Smith and Nephew, Limited - Applicants: T.J.Smith and Nephew,Limited - Inventors: Edward William Walton; George Russell Walton - Web page: https://patentgrep.com/patent/US20190167865A1 ## CPC - A61M 1/81: {Piston pumps, e.g. syringes} - 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 1/732: {Visual indicating means for vacuum pressure} - A61M 1/74: {Suction control (underwater drainage A61M1/61)} - A61M 1/76: {Handpieces (specially for suction-irrigation A61M1/774, aspiration tips A61M1/84)} - A61M 1/80: {Suction pumps (A61M1/64, A61M1/71, A61M60/00 take precedence)} - A61M 1/86: {Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece} - 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 1/915: {Constructional details of the pressure distribution manifold} - A61M 1/962: {having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction} - A61F 2013/0028: {applying of mechanical pressure; passive massage} - A61M 1/84: {Drainage tubes; Aspiration tips (for negative pressure wound therapy A61M1/90; for surgical cutting instruments A61B17/32)} - 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 Some embodiments are directed to a system 10 for the application of topical negative pressure therapy to a site 18 on the body of a mammal. Some embodiments of the system 10 comprise a piston 22 and cylinder 24 device 12 having a self-contained power source for the generation of a reduced pressure and for aspirating the site 18. Some embodiments of the system 10 comprise a dressing 14 sealably surrounding the site 18 that can be operably connected to the device 12 by a conduit means 16 to apply the reduced pressure to the site 18. ## Claims ### Claim at position 1 1-40. (canceled) ### Claim 41 A system for the application of negative pressure therapy, comprising: a pump for generating negative pressure; a dressing for covering and protecting a wound, the dressing comprising a porous layer configured to contact the wound, a cover layer, and an absorbent layer between the porous layer and the cover layer; a first conduit having a first end connected to the dressing and a second end extending away from the dressing; a second conduit having a first end configured to be connected to the pump and a second end configured to extend away from the pump, wherein the first and second conduits are configured to be fluidically connected to provide fluid communication between the pump and the dressing; and a one-way valve provided at the second end of the first conduit and configured to be in-line between the pump and the dressing when the first and second conduits are fluidically connected, wherein the second conduit is configured to be fluidically disconnected from the first conduit after negative pressure has been applied to the dressing from the pump and the one-way valve is configured to maintain a negative pressure within the dressing when the second conduit is disconnected. ### Claim 42 (depends on 41) The system of claim 41, wherein the second end of the second conduit is configured to be removably connected to the one-way valve. ### Claim 43 (depends on 41) The system of claim 41, wherein the pump comprises a portable battery powered pump. ### Claim 44 (depends on 41) The system of claim 41, wherein the one-way valve is integral with the first conduit. ### Claim 45 (depends on 41) The system of claim 41, wherein the absorbent layer comprises superabsorbent material. ### Claim 46 (depends on 41) The system of claim 41, wherein the absorbent layer comprises carbomethoxycellulose. ### Claim 47 (depends on 41) The system of claim 41, further comprising a second suction device configured to generate negative pressure within the dressing, the second suction device being removably connectable to the one-way valve. ### Claim 48 A method for the application of negative pressure therapy to a wound, the method comprising: sealingly enclosing the wound with a dressing comprising a porous layer configured to contact the wound, a cover layer and an absorbent layer between the porous layer and the cover layer; wherein ambient air is substantially prevented from entering a space between the cover layer and the wound; operating a pump to apply a desired level of negative pressure within the dressing, wherein the pump is connected to the cover layer through a fluid passage so that the pump is in fluid communication with the space between the cover layer and the wound, and wherein the negative pressure is applied through a one-way valve in-line between the pump and the dressing, wherein the fluid passage comprises: a first conduit providing fluid communication between the dressing and the one-way valve and a second conduit providing fluid commination between the one-way and the pump; and disconnecting the second conduit from the first conduit, wherein the one-way valve maintains a negative pressure within the dressing when the second conduit is disconnected from the first conduit. ### Claim 49 (depends on 48) The method of claim 48, wherein the second conduit comprises a first end connected to the pump and a second end removably connected to the one-way valve when the pump is operated to apply the desired level of negative pressure. ### Claim 50 (depends on 48) The method of claim 48, wherein disconnecting the second conduit from the first conduit comprises disconnecting the second conduit from the one-way valve. ### Claim 51 (depends on 48) The method of claim 48, further comprising reconnecting the second conduit to the first conduit and re-operating the pump to apply negative pressure within the dressing.