# US 10,369,342 B2 · Drug solution injection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,369,342 B2 - Document ID: US10369342B2 - Status: Granted - Kind: B2 - Application number: 15/401,165 - Filed: 2017-01-09 - Published: 2017-04-27 - Granted: 2019-08-06 - Earliest claimed: 2014-07-09 - Assignees: Toppan Printing Co., Ltd. - Applicants: Toppan Printing Co., Ltd. - Inventors: Yoshihiro Kodama - Web page: https://patentgrep.com/patent/US10369342B2 ## CPC - A61M 37/0015: {by using microneedles} - A61M 5/3298: {Needles arranged in parallel} - A61M 37/00: Other apparatus for introducing media into the body (for reproduction or fertilisation A61B17/425; apparatus for iontophoresis or cataphoresis A61N1/30); Percutany, i.e. introducing medicines into the body by diffusion through the skin (salt baths A61H33/04) - A61M 2037/0023: {Drug applicators using microneedles} - A61M 2037/003: {having a lumen} - A61M 2037/0061: {Methods for using microneedles} - A61M 2205/02: characterised by a particular materials - 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 injection device including a microneedle structure including a substrate having a first surface and a second surface opposite to the first surface, and a protrusion protruding from the first surface in a direction opposite to the second surface, the protrusion having a through hole which penetrates from a tip of the protrusion to the second surface in the direction of the protrusion such that a liquid flows through the through hole, and one or more check valves positioned to stop the liquid flowing from the second surface. ## Claims ### Claim 1 An injection device, comprising: a microneedle structure having a channel; a check valve positioned in the channel of the microneedle structure; and an annular seal member positioned on downstream of the check valve in the channel such that the annular seal member is in contact with an outer peripheral portion of the check valve, wherein the microneedle structure includes a substrate and at least one protrusion formed on a first surface of the substrate such that the at least one protrusion is protruding from the first surface of the substrate and has a through hole penetrating from a tip of the at least one protrusion to a second surface of the substrate on an opposite side with respect to the first surface and configured to flow a liquid from the channel, and the annular seal member is sandwiched between the check valve and the second surface of the substrate inside the channel and enclosing an opening of the through hole. ### Claim 2 (depends on 1) The injection device of claim 1, wherein the microneedle structure has a cylindrical part which extends from the second surface in a direction opposite to the protrusion and forms the channel through which the liquid flows, and the check valve is positioned inside the cylindrical part. ### Claim 3 (depends on 1) The injection device of claim 1, further comprising: a cylindrical holder having two open ends and forming the channel through which the liquid flows, wherein the cylindrical holder has one of the two open ends configured to support the substrate such that the at least one protrusion protrudes out of the cylindrical holder from the one of the two open ends, and the check valve is positioned inside the cylindrical holder. ### Claim 4 (depends on 1) The injection device of claim 1, further comprising: a second check valve positioned on upstream of the check valve in the channel; and a second annular seal member positioned between the check valve and the second check valve. ### Claim 5 (depends on 2) The injection device of claim 2, further comprising: a second check valve positioned on upstream of the check valve in the channel; and a second annular seal member positioned between the check valve and the second check valve. ### Claim 6 (depends on 3) The injection device of claim 3, further comprising: a second check valve positioned on upstream of the check valve in the channel; and a second annular seal member positioned between the check valve and the second check valve. ### Claim 7 (depends on 1) The injection device of claim 1, further comprising: a second check valve serially positioned inside and along the channel through which the liquid flows. ### Claim 8 (depends on 2) The injection device of claim 2, further comprising: a second check valve serially positioned inside and along the channel through which the liquid flows. ### Claim 9 (depends on 3) The injection device of claim 3, further comprising: a second check valve serially positioned inside and along the channel through which the liquid flows. ### Claim 10 (depends on 4) The injection device of claim 4, wherein the second check valve is positioned in a series with the check valve inside and along the channel through which the liquid flows. ### Claim 11 (depends on 1) The injection device of claim 1, wherein the microneedle structure comprises a biocompatible material. ### Claim 12 (depends on 2) The injection device of claim 2, wherein the microneedle structure comprises a biocompatible material. ### Claim 13 (depends on 3) The injection device of claim 3, wherein the microneedle structure comprises a biocompatible material. ### Claim 14 (depends on 4) The injection device of claim 4, wherein the microneedle structure comprises a biocompatible material. ### Claim 15 (depends on 1) The injection device of claim 1, wherein the at least one protrusion comprises a plurality of protrusions such that the protrusions has through holes, respectively, and that the annular seal member encloses all openings of the through holes on the second surface of the substrate in the microneedle structure. ### Claim 16 (depends on 1) The injection device of claim 1, wherein the check valve is configured such that the channel through which the liquid flows opens upon receiving a forward pressure in a range of from 0.01 MPa to 0.30 MPa, and the check valve is configured to close the channel upon receiving a reverse pressure in a range of from 0.05 MPa to 0.30 MPa. ### Claim 17 (depends on 2) The injection device of claim 2, wherein the check valve is configured such that the channel opens upon receiving a forward pressure in a range of from 0.01 MPa to 0.30 MPa, and the check valve is configured to close the channel upon receiving a reverse pressure in a range of from 0.05 MPa to 0.30 MPa. ### Claim 18 (depends on 3) The injection device of claim 3, wherein the check valve is configured such that the channel opens upon receiving a forward pressure in a range of from 0.01 MPa to 0.30 MPa, and the check valve is configured to close the channel upon receiving a reverse pressure in a range of from 0.05 MPa to 0.30 MPa. ### Claim 19 (depends on 4) The injection device of claim 4, wherein each of the check valves is configured such that the channel opens upon receiving a forward pressure in a range of from 0.01 MPa to 0.30 MPa, and each of the check valves is configured to close the channel upon receiving a reverse pressure in a range of from 0.05 MPa to 0.30 MPa. ### Claim 20 (depends on 7) The injection device of claim 7, wherein each of the check valves is configured such that the channel opens upon receiving a forward pressure in a range of from 0.01 MPa to 0.30 MPa, and the check valves is configured to close the channel upon receiving a reverse pressure in a range of from 0.05 MPa to 0.30 MPa.