# US 11,998,722 B2 · Female syringe barrel, syringe kit, and syringe connection method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,722 B2 - Document ID: US11998722B2 - Status: Granted - Kind: B2 - Application number: 16/846,801 - Filed: 2020-04-13 - Published: 2020-07-30 - Granted: 2024-06-04 - Earliest claimed: 2017-10-13 - Assignees: Terumo Kabushiki Kaisha - Applicants: Terumo Kabushiki Kaisha - Inventors: Hitoshi Okihara - Web page: https://patentgrep.com/patent/US11998722B2 ## CPC - A61M 5/1782: {Devices aiding filling of syringes in situ (combination of a vial and a syringe for transferring or mixing their contents A61J1/2096, filling of medical containers in general B65B3/003)} - A61M 5/3134: {characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula} - A61M 5/002: {Packages specially adapted therefor, e.g. packages for syringes or needles or kits for diabetics} - A61M 5/31596: {comprising means for injection of two or more media, e.g. by mixing} - A61M 39/1011: {Locking means for securing connection; Additional tamper safeties (A61M39/16 takes precedence)} - A61M 39/1033: {Swivel nut connectors, e.g. threaded connectors or bayonet-connectors} - A61M 2005/3131: {specially adapted for improving sealing or sliding} - A61M 2039/0027: {for mixing several substances from different containers} - A61M 2039/1044: {Verifying the connection, e.g. audible feedback, tactile feedback, visual feedback, using external light sources} - A61M 2039/1066: {having protection means, e.g. sliding sleeve to protect connector itself, shrouds to protect a needle present in the connector, protective housing, isolating sheath} - A61M 2039/1077: {Adapters, e.g. couplings adapting a connector to one or several other connectors} - A61M 2039/1088: {having a plurality of male connectors, e.g. Luer connectors} - 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 A female syringe barrel is disclosed, which includes two protrusions provided on a cylindrical portion. A length (Lp) of each protrusion of the two protrusions along a direction, perpendicular to an axis of the cylindrical portion and perpendicular to a direction in which each protrusion of the two protrusions protrudes from the cylindrical portion, is 2.0 mm to 4.5 mm. A width of each protrusion of the two protrusions along an axial direction of the cylindrical portion is 1.0 mm to 2.1 mm. Each protrusion of the two protrusions has an inclined surface, which opposes a trailing flank of a screw when the two protrusions are engaged into the screw of a lock adapter, in an end portion close to a barrel body. ## Claims ### Claim 1 A syringe kit comprising: a male syringe having a male syringe barrel that includes a nozzle configured as a male luer, a lock adapter which surrounds an outer circumferential surface of the nozzle and has a screw on an inner circumferential surface of the lock adapter, and a male barrel body connected to the nozzle and the lock adapter; a female syringe having a female syringe barrel that includes a cylindrical portion configured as a female luer to which the nozzle is connectable, two protrusions which protrude from an outer circumferential surface of the cylindrical portion and are engageable with the screw of the lock adapter, and a female barrel body connected to the cylindrical portion; each of the two protrusions has an inclined surface; when the screw and the two protrusions are engaged, the two protrusions which each have the inclined surface are configured to advance over a screw thread of the lock adapter by a torque smaller than a torque at which the female syringe breaks when the female syringe is engaged with a convex reference conical fitting for a stress crack test specified in ISO 594-2; and wherein the two protrusions each have a chamfered corner chamfered on a side opposing the inclined surface. ### Claim 2 (depends on 1) The syringe kit according to claim 1, wherein the male syringe barrel and the female syringe barrel are both made of a cyclic polyolefin. ### Claim 3 (depends on 1) The syringe kit according to claim 1, further comprising: an outer diameter of the male barrel body and an outer diameter of the female barrel body are both 6.7 mm or larger; and an axial length of the male barrel body and an axial length of the female barrel body are both 35 mm or longer. ### Claim 4 (depends on 1) The syringe kit according to claim 1, further comprising: an inner diameter of the screw of the lock adapter is 6.8 mm to 7.2 mm; and the cylindrical portion includes an abutment portion provided at a position closer to a proximal end than the two protrusions on an outer circumferential portion of the cylindrical portion. ### Claim 5 (depends on 4) The syringe kit according to claim 4, wherein the abutment portion has an outer diameter of 6.4 mm to 6.8 mm; and the abutment portion is configured to abut on an inner circumferential surface of the screw of the lock adapter so as to suppress an inclination of an axis of the cylindrical portion with respect to an axis of the lock adapter when the two protrusions of the cylindrical portion are engaged with the screw of the lock adapter of the male syringe. ### Claim 6 (depends on 5) The syringe kit according to claim 5, wherein the abutment portion is continuous from a proximal end of each of the two protrusions to a position separated by at least 4 mm toward the female barrel body from a distal end of the cylindrical portion. ### Claim 7 (depends on 1) The syringe kit according to claim 1, wherein the inclined surface of each of the two protrusions is configured to oppose a trailing flank of the screw of the lock adapter when the two protrusions are engaged with the screw of the lock adapter. ### Claim 8 (depends on 1) The syringe kit according to claim 1, wherein the chamfered corner is an arcuate curved surface. ### Claim 9 (depends on 1) The syringe kit according to claim 1, further comprising: a length of each of the two protrusions along a direction, perpendicular to an axis of the cylindrical portion and perpendicular to a direction in which each of the two protrusions protrudes from the cylindrical portion, is 2.0 mm to 4.5 mm; and a width of each of the two protrusions along an axial direction of the cylindrical portion is 1.0 mm to 2.1 mm. ### Claim 10 (depends on 1) The syringe kit according to claim 1, further comprising: a distal end protruding portion protruding from a distal end portion of the cylindrical portion of the female syringe toward a distal end, and wherein the distal end protruding portion is closer to the distal end than the two protrusions. ### Claim 11 (depends on 1) The syringe kit according to claim 1, wherein the cylindrical portion of the female syringe has a proximal-end-side protruding portion that protrudes from an outer circumferential portion of the cylindrical portion and is provided at a position closer to a proximal end than one of the two protrusions; and the proximal-end-side protruding portion is configured to abut on the inner circumferential surface of the lock adapter and configured to suppress an inclination of an axis of the cylindrical portion with respect to an axis of the lock adapter when the two protrusions of the cylindrical portion are engaged with the screw of the lock adapter of the male syringe. ### Claim 12 (depends on 1) The syringe kit according to claim 1, wherein the cylindrical portion includes an abutment portion having an outer diameter of 6.4 mm to 6.8 mm on an outer circumferential portion of the cylindrical portion; the abutment portion is closer to a proximal end than the two protrusions; and the abutment portion is configured to abut on an inner circumferential surface of the screw of the lock adapter and configured to suppress an inclination of an axis of the cylindrical portion with respect to an axis of the lock adapter when the two protrusions of the cylindrical portion are engaged with the screw of the lock adapter of the male syringe. ### Claim 13 (depends on 12) The syringe kit according to claim 12, wherein the abutment portion is continuous from each proximal end of the two protrusions to a position separated by at least 4 mm toward the female barrel body from a distal end of the cylindrical portion. ### Claim 14 (depends on 1) A syringe connection method for connecting the male syringe and the female syringe of the syringe kit of claim 1 by screwing, the syringe connection method comprising: causing the two protrusions having the inclined surface to advance over the screw thread of the lock adapter by the torque smaller than the torque at which the female syringe breaks when the female syringe is engaged with the convex reference conical fitting for the stress crack test specified in ISO 594-2 when screwing the screw and the two protrusions and generating a click feeling along with the advancement. ### Claim 15 (depends on 14) The syringe connection method according to claim 14, wherein the cylindrical portion has an abutment portion provided at a position closer to a proximal end than the two protrusions on the outer circumferential surface of the cylindrical portion, the method comprising: suppressing an inclination of an axis of the cylindrical portion with respect to an axis of the lock adapter when the screw and the two protrusions are engaged with the abutment portion abutting on the inner circumferential surface of the lock adapter. ### Claim 16 (depends on 14) The syringe connection method according to claim 14, further comprising: molding both the male syringe barrel and the female syringe barrel from a cyclic polyolefin. ### Claim 17 A syringe kit comprising: a male syringe having a male syringe barrel that includes a nozzle configured as a male luer, a lock adapter which surrounds an outer circumferential surface of the nozzle and has a screw on an inner circumferential surface, and a male barrel body connected to the nozzle and the lock adapter; a female syringe having a female syringe barrel that includes a cylindrical portion configured as a female luer to which the nozzle is connectable, two protrusions which protrude from an outer circumferential surface of the cylindrical portion and are engageable with the screw of the lock adapter, and a female barrel body connected to the cylindrical portion, each of the two protrusions has an inclined surface; when the screw and the two protrusions are engaged, the two protrusions which each have the inclined surface are configured to advance over a screw thread of the lock adapter; and wherein the two protrusions each have a chamfered corner chamfered on a side opposing the inclined surface, and the chamfered corner is an arcuate curved surface. ### Claim 18 (depends on 17) The syringe kit according to claim 17, wherein the inclined surface of each of the two protrusions is configured to oppose a trailing flank of the screw of the lock adapter when the two protrusions are engaged with the screw of the lock adapter.