# US 11,896,754 B2 · Wound dressing with vacuum reservoir > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,754 B2 - Document ID: US11896754B2 - Status: Granted - Kind: B2 - Application number: 16/668,589 - Filed: 2019-10-30 - Published: 2020-05-07 - Granted: 2024-02-13 - Earliest claimed: 2005-09-07 - Assignees: Smith & Nephew, Inc. - Applicants: Smith & Nephew, Inc. - Inventors: Kurt Haggstrom; E. David Fink; Katja Grundmeier - Web page: https://patentgrep.com/patent/US11896754B2 ## CPC - A61M 1/732: {Visual indicating means for vacuum pressure} - 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 13/0209: {comprising superabsorbent material} - 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 1/74: {Suction control (underwater drainage A61M1/61)} - A61M 1/966: {having a pressure sensor on or near the dressing} - A61M 1/985: {the dressing itself forming the collection container} - A61M 39/24: Check- or non-return valves - A61M 1/915: {Constructional details of the pressure distribution manifold} - A61M 1/984: {portable on the body} - 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 2205/15: Detection of leaks - A61M 2205/18: with alarm - A61M 2205/3344: Measuring or controlling pressure at the body treatment site - A61M 2205/3368: Temperature - A61M 2205/583: by visual feedback - A61M 2205/584: having a color code - A61M 2205/587: Lighting arrangements - A61M 2205/6081: Colour codes - A61M 2205/8206: battery-operated - 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 wound dressing apparatus includes a wound dressing member dimensioned for positioning relative to a wound bed. The wound dressing member including an internal vacuum reservoir and has a port in communication with the vacuum reservoir for applying subatmospheric pressure to the vacuum reservoir to facilitate removal of fluid from the wound bed. The wound dressing member includes a visual pressure indicator associated therewith for indicating a level of pressure within the vacuum reservoir. The visual pressure indicator includes color indicia having a plurality of colors corresponding to a condition of the pressure within the vacuum reservoir. The wound dressing member includes a lower absorbent member positionable adjacent the wound bed and an upper member which at least partially defines the vacuum reservoir. At least one of the top member and the lower absorbent member has the visual pressure indicator mounted thereto. ## Claims ### Claim 1 A wound dressing apparatus for use in negative pressure wound therapy, comprising: a porous layer configured to be in direct contact with a wound; a wound cover layer dimensioned for positioning over the wound, wherein the wound cover layer defines an internal vacuum reservoir when the wound cover layer is positioned over the wound; a fabric layer positioned between the porous layer and the wound cover layer; and a visual indicator device in communication with the wound cover layer and configured to display a condition of the wound dressing apparatus, wherein the visual indicator device comprises a display comprising visual indicia and wherein the visual indicia comprises various symbols wherein each symbol correspond to a different condition of the wound dressing apparatus. ### Claim 2 (depends on 1) The wound dressing apparatus of claim 1, further comprising a canister for collection of wound exudate. ### Claim 3 (depends on 1) The wound dressing apparatus of claim 1, wherein the porous layer further comprises at least one medicament. ### Claim 4 (depends on 1) The wound dressing apparatus of claim 1, further comprising a connector on the wound cover layer in fluid communication with the internal vacuum reservoir and configured to be connected with a source of negative pressure. ### Claim 5 (depends on 4) The wound dressing apparatus of claim 4, wherein the connector extends into the internal vacuum reservoir. ### Claim 6 (depends on 1) The wound dressing apparatus of claim 1, wherein the wound cover layer comprises an access door to provide access to an interior of the internal vacuum reservoir. ### Claim 7 (depends on 1) The wound dressing apparatus of claim 1, wherein the visual indicator device is mounted to the wound cover layer. ### Claim 8 (depends on 1) The wound dressing apparatus of claim 1, wherein the visual indicator device is configured to display a visual indication of vacuum pressure within the internal vacuum reservoir. ### Claim 9 (depends on 8) The wound dressing apparatus of claim 8, wherein the visual indicator device comprises a plurality of pressure indicators configured to display different visual indications at different levels of vacuum pressure within the internal vacuum reservoir. ### Claim 10 (depends on 1) The wound dressing apparatus of claim 1, wherein the visual indicia comprises various symbols which correspond to a state of a vacuum pressure within the internal vacuum reservoir. ### Claim 11 (depends on 1) The wound dressing apparatus of claim 1, further comprising an adhesive material on an underside of the wound cover layer on a peripheral portion of the wound cover layer, the adhesive material configured to be secured to tissue surrounding the wound. ### Claim 12 (depends on 11) The wound dressing apparatus of claim 11, further comprising a removable contact liner attached to the adhesive material and configured to be removed prior to use of the wound dressing apparatus. ### Claim 13 (depends on 11) The wound dressing apparatus of claim 11, further comprising an adherent layer, wherein the adhesive material is on the adherent layer. ### Claim 14 A wound dressing apparatus, comprising: a porous layer configured to be in contact with a wound; a wound cover layer positioned over the porous layer; a fabric layer positioned between the porous layer and the wound cover layer; and a visual indicator device in communication with the wound cover layer and configured to display a condition of the wound dressing apparatus, wherein the visual indicator device comprises a display comprising visual indicia and wherein the visual indicia comprises various symbols wherein each symbol correspond to a different condition of the wound dressing apparatus. ### Claim 15 (depends on 14) The wound dressing apparatus of claim 14, wherein the fabric layer is an absorbent member comprising a super absorbent material.