# US 8,771,244 B2 · Attachment device for use in the vacuum therapy of wounds > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,244 B2 - Document ID: US8771244B2 - Status: Granted - Kind: B2 - Application number: 12/974,067 - Filed: 2010-12-21 - Published: 2011-06-23 - Granted: 2014-07-08 - Earliest claimed: 2009-12-23 - Assignees: Paul Hartmann AG - Applicants: Axel Eckstein; Juergen Hofstetter; Pierre Croizat; Klaus Klimenta; Steffen Suess - Inventors: Axel Eckstein; Juergen Hofstetter; Pierre Croizat; Klaus Klimenta; Steffen Suess - Web page: https://patentgrep.com/patent/US8771244B2 ## CPC - 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}) - 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 1/912: {Connectors between dressing and drainage tube} - A61M 1/915: {Constructional details of the pressure distribution manifold} - A61F 2013/00174: {possibility of applying pressure} - A61F 2013/00536: {for draining or irrigating wounds} - A61M 1/92: {with liquid supply means} - 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)} - 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 An attachment device (2) for use in the vacuum therapy of wounds has a vacuum-tight mounting element (6). A conduit is fastening to the upper side of that mounting element in a vacuum-tight manner. The conduit (4) communicates with the wound space through openings (22) in the mounting element (6) and in the vacuum dressing. The conduit (4) is flexible and flat and is connected to the mounting element (6) non-detachably and extensively in a longitudinal section (8) on the wound side over at least 70% of its surface projected perpendicularly onto the mounting means (6). The conduit (4) is made out of a flexible elastomer material of Shore A hardness of no more than 60 and the thickness (D) of the combined conduit (4) and mounting element (6) is no more than 7 mm. ## Claims ### Claim 1 An attachment device for use in vacuum therapy of a wound, the wound being treated using a vacuum dressing, wherein the vacuum dressing is adapted to be fixed to skin of a patient surrounding the wound to cover and tightly seal the wound with respect to atmosphere, the vacuum dressing having an opening adapted to communicate with the wound, the attachment device comprising: a large-surface, vacuum-tight mounting element, said mounting element structured for attachment to the vacuum dressing and not to the skin of the patient surrounding the wound, said mounting element having openings, wherein said mounting element is made of a flexible elastomer non-adhesive material with a Shore A hardness of 5 to 60; and a flexible, flat conduit having a width of at least 10 mm, wherein said conduit has an upper wall, a lower wall and two side walls disposed between and integral with said upper wall and said lower wall, said upper wall, lower wall and side walls thereby defining a flat duct passing longitudinally through said conduit, wherein said lower wall has openings and said side walls and said upper walls have no openings and, as projected perpendicularly onto said mounting element, at least 70% of a lower surface portion of said lower wall is attached to an upper side of said mounting element in a vacuum-tight, extensive and non-detachable manner, said conduit also structured for attachment to a vacuum generating device for evacuation thereof, wherein said lower wall openings are adapted to communicate with the wound via said openings in said mounting element and the opening in the vacuum dressing, said conduit being made from a flexible elastomer material of Shore A hardness of no more than 60, wherein a combined thickness of said conduit and said mounting element does not exceed 7 mm, said conduit thereby constituting an extruded part having internal members to prevent collapse of said conduit when a vacuum is applied, said internal members being integrally molded to form one integral element with said material of said conduit, wherein said internal members comprise a plurality of ribs, protrusions or septa, said ribs, protrusions or septa extending continuously from end to end in a longitudinal direction of said conduit, wherein at least one of said ribs, protrusions or septa defines multiple ducts in said conduit which are pressure-tightly separated from each other, said conduit thereby being structured as one integral element. ### Claim 2 (depends on 1) The attachment device of claim 1, wherein said conduit is connected to said mounting element non-detachably and extensively in a longitudinal section on the wound side over at least 80% of said lower surface of said lower wall. ### Claim 3 (depends on 1) The attachment device of claim 1, wherein a width of said conduit is at least 15 mm. ### Claim 4 (depends on 1) The attachment device of claim 1, wherein said material from which said conduit is made has a Shore A hardness of 5 to 60. ### Claim 5 (depends on 1) The attachment device of claim 1, wherein, said conduit, seen in cross-section in a circumferential direction, is completely tubular. ### Claim 6 (depends on 1) The attachment device of claim 1, wherein said mounting element is made of a flexible elastomer material with a has a thickness of preferably 0.75 to 3 mm. ### Claim 7 (depends on 1) The attachment device of claim 1, wherein, projected perpendicularly onto said mounting element, an area of said mounting element is at least 1.5 times an area of said conduit. ### Claim 8 (depends on 1) The attachment device of claim 1, wherein, seen in cross-section, said conduit is trapezoidal in shape. ### Claim 9 (depends on 1) The attachment device of claim 1, wherein said conduit is adhesively bonded or thermally joined to a topside of said mounting element facing away from the wound. ### Claim 10 (depends on 1) The attachment device of claim 1, wherein, in a region of flat sides thereof that are non-detachably joined, said lower wall openings and said openings in said mounting element coincide and are aligned with each other. ### Claim 11 (depends on 1) The attachment device of claim 1, wherein there are at least two lower wall openings per cm length of said conduit. ### Claim 12 (depends on 10) The attachment device of claim 10, wherein a clearance opening area of said lower wall openings and said openings in said mounting element is 5 to 50% of an area of non-detachably joined flat sides of said conduit and said mounting element. ### Claim 13 (depends on 1) The attachment device of claim 1, wherein said mounting element is attached to the vacuum dressing using an additional adhesive film, said additional adhesive film being provided on a topside of said mounting element facing away from the wound to overlap said mounting element along a perimeter thereof. ### Claim 14 (depends on 13) The attachment device of claim 13, wherein said additional adhesive film does not cover said conduit. ### Claim 15 (depends on 1) The attachment device of claim 1, wherein said mounting element or said adhesive film overlapping said mounting element has a peripheral frame-forming support means.