# US 10,864,306 B2 · Negative-pressure wound therapy apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,306 B2 - Document ID: US10864306B2 - Status: Granted - Kind: B2 - Application number: 15/400,007 - Filed: 2017-01-06 - Published: 2017-04-27 - Granted: 2020-12-15 - Earliest claimed: 2014-07-08 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Masaaki Fujisaki - Web page: https://patentgrep.com/patent/US10864306B2 ## 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] - A61F 13/01: Non-adhesive bandages or dressings - A61M 1/60: {Containers for suction drainage, adapted to be used with an external suction source (containers not adapted for subjection to vacuum A61M1/69)} - A61M 1/74: {Suction control (underwater drainage A61M1/61)} - A61M 1/80: {Suction pumps (A61M1/64, A61M1/71, A61M60/00 take precedence)} - A61M 1/92: {with liquid supply means} - A61M 1/96: {Suction control thereof} - A61M 1/962: {having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction} - A61M 1/98: {Containers specifically adapted for negative pressure wound therapy} - A61M 1/985: {the dressing itself forming the collection container} - 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) - 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 Provided is a negative-pressure wound therapy apparatus capable of causing negative pressure in a closed space defined by a wound dressing and a wound region with a sufficient suction flow rate as needed even with a miniaturized pump device. In atypical use that needs a high suction flow rate, because a pump device (30) with a high suction flow rate is attached to a wound dressing (10) and sucks gas from a closed space (904) defined by a wound region (903) and the wound dressing (10), even when a pump device (20) for typical use is miniaturized and the suction flow rate of the pump device (20) is reduced, a therapy apparatus (100) can achieve a suction flow rate sufficient for atypical use. Thus, the pressure value in the closed space (904) can decrease to a desired value more quickly. ## Claims ### Claim 1 A negative-pressure wound therapy apparatus comprising: a wound dressing adapted for providing a closed space between a central portion of a principal surface of the wound dressing and a wound region by closely contacting a peripheral portion of the principal surface with a periphery of a skin surface in the wound region; a first pump device including a first conduit attached to the wound dressing and a first inlet communicating with the closed space through the first conduit; and a second pump device including a second conduit freely attachable to and detachable from the wound dressing and a second inlet communicating with the closed space through the second conduit, wherein a suction flow rate of the second pump device is higher than a suction flow rate of the first pump device when the first pump device and the second pump device are driven simultaneously, the first pump device sucks fluid from the closed space through the first conduit and the first inlet, and when the second conduit is attached to the wound dressing the second conduit communicates directly with the closed space, the second pump device sucks fluid from the closed space through the second conduit and the second inlet. ### Claim 2 (depends on 1) The negative-pressure wound therapy apparatus according to claim 1, wherein when the second conduit is attached to the wound dressing, the first pump device and the second pump device are driven simultaneously. ### Claim 3 (depends on 1) The negative-pressure wound therapy apparatus according to claim 1, wherein the first pump device includes a first storage portion disposed in the first conduit, the second pump device includes a second storage portion disposed in the second conduit, and a storage capacity of the second storage portion is larger than a storage capacity of the first storage portion. ### Claim 4 (depends on 3) The negative-pressure wound therapy apparatus according to claim 3, further comprising a cleaning tool including a third conduit attached to the wound dressing and a third storage portion, the third storage portion communicating with the closed space through the third conduit and configured to store a cleaning solution for cleaning the wound region. ### Claim 5 (depends on 1) The negative-pressure wound therapy apparatus according to claim 1, wherein the first pump device includes a pump drivable by a piezoelectric element. ### Claim 6 (depends on 2) The negative-pressure wound therapy apparatus according to claim 2, wherein the first pump device includes a first storage portion disposed in the first conduit, the second pump device includes a second storage portion disposed in the second conduit, and a storage capacity of the second storage portion is larger than a storage capacity of the first storage portion. ### Claim 7 (depends on 2) The negative-pressure wound therapy apparatus according to claim 2, wherein the first pump device includes a pump drivable by a piezoelectric element. ### Claim 8 (depends on 3) The negative-pressure wound therapy apparatus according to claim 3, wherein the first pump device includes a pump drivable by a piezoelectric element. ### Claim 9 (depends on 4) The negative-pressure wound therapy apparatus according to claim 4, wherein the first pump device includes a pump drivable by a piezoelectric element. ### Claim 10 (depends on 1) The negative-pressure wound therapy apparatus according to claim 1, wherein the first conduit is disposed on a first end portion side as seen from a central portion in the wound dressing, and the second conduit is disposed on a second end portion side in a direction opposite the first end portion side as seen from the central portion in the wound dressing. ### Claim 11 (depends on 4) The negative-pressure wound therapy apparatus according to claim 4, wherein a location where the third conduit is attached to the wound dressing is nearer to the first conduit than the second conduit, the third conduit is disposed on a first end portion side as seen from the central portion in the wound dressing, and the second conduit is disposed on a second end portion side in a direction opposite to the first end portion as seen from the central portion in the wound dressing. ### Claim 12 (depends on 2) The negative-pressure wound therapy apparatus according to claim 2, wherein the first conduit is disposed on a first end portion side as seen from a central portion in the wound dressing, and the second conduit is disposed on a second end portion side in a direction opposite the first end portion side as seen from the central portion in the wound dressing. ### Claim 13 A negative-pressure wound therapy apparatus comprising: a wound dressing adapted for providing a closed space between a central portion of a principal surface of the wound dressing and a wound region by closely contacting a peripheral portion of the principal surface with a periphery of a skin surface in the wound region; a first pump device including a first conduit attached to the wound dressing and a first inlet communicating with the closed space through the first conduit; and a second pump device including a second conduit freely attachable to and detachable from the wound dressing and a second inlet communicating with the closed space through the second conduit, the second pump device being isolated from the first pump device, wherein a suction flow rate of the second pump device is higher than a suction flow rate of the first pump device when the first pump device and the second pump device are driven simultaneously, the first pump device sucks fluid from the closed space through the first conduit and the first inlet, and when the second conduit is attached to the wound dressing the second conduit communicates directly with the closed space, the second pump device sucks fluid from the closed space through the second conduit and the second inlet.