# US 11,305,071 B2 · Multiple injection needle assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,071 B2 - Document ID: US11305071B2 - Status: Granted - Kind: B2 - Application number: 16/480,502 - Filed: 2018-01-24 - Published: 2019-12-19 - Granted: 2022-04-19 - Earliest claimed: 2017-01-24 - Assignees: Terumo Europe N.V. - Applicants: Terumo Europe N.V. - Inventors: Pieter Casteleyn; Ludo Daniels; Veerle Royen; Christian Fripon - Web page: https://patentgrep.com/patent/US11305071B2 ## CPC - A61M 5/32: Needles; Details of needles pertaining to their connection with syringe or hub (infusion needles A61M5/158); Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles - A61M 5/3298: {Needles arranged in parallel} - A61M 5/329: {characterised by features of the needle shaft} - A61M 5/3291: {Shafts with additional lateral openings} - A61M 5/3295: {Multiple needle devices, e.g. a plurality of needles arranged coaxially or in parallel} - 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 Some embodiments are directed to a needle assembly including at least N injection needles where N is at least four and a multiple of two. The needle assembly also includes a first liquid port adapted to be connected to an injection device, and N second liquid ports connected to one of the N injection needles. N/2 main liquid pathways each have an entrance connected to the first liquid port and an exit, further including N/2 secondary liquid pathways that have two extremities each opening on one of the N second liquid ports, and a mid portion connected to the exit of one of the main liquid pathways. The main liquid pathways and the secondary liquid pathways define N liquid flow paths between the first liquid port and the N second liquid ports dimensioned so a pressure drop between them is similar. ## Claims ### Claim 1 An injection needle assembly, comprising: at least N injection needles where N is at least four and a multiple of two, a first liquid port adapted to be connected to an injection device, N second liquid ports, each connected to only one of the N injection needles, N 2 main liquid pathways each having an entrance connected to the first liquid port and having an exit, wherein the injection needle assembly further comprises N 2 secondary liquid pathways, further including: two extremities each opening on one of the N second liquid ports, and a mid portion connected to the exit of one of the main liquid pathways; and wherein the main liquid pathways and the secondary liquid pathways define N liquid flow paths between the first liquid port and the N second liquid ports and are dimensioned so that a pressure drop between the first liquid port and each of the N second liquid ports is between ±10%. ### Claim 2 (depends on 1) The injection needle assembly according to claim 1, wherein the pressure drop between the first liquid port and each of the second liquid ports is within 5%. ### Claim 3 (depends on 1) The injection needle assembly according to claim 1, wherein a length of any of the N liquid flow paths is between ±10%. ### Claim 4 (depends on 1) The injection needle assembly according to claim 1, wherein a length of any of the N liquid flow paths is within ±10% of each other. ### Claim 5 (depends on 1) The injection needle assembly according to claim 1, wherein a majority of the N injection needles are aligned in a straight line. ### Claim 6 (depends on 5) The injection needle assembly according to claim 5, wherein all the injection needles are aligned in a straight line. ### Claim 7 (depends on 1) The injection needle assembly according to claim 1, wherein: the main liquid pathways have a substantially constant cross-section surface between each others, and the secondary liquid pathways have a substantially constant cross-section surface between each others. ### Claim 8 (depends on 7) The injection needle assembly according to claim 7, wherein: the main liquid pathways have a cross section surface within ±10% between each others, and the secondary liquid pathways have a cross section surface within ±10% between each others. ### Claim 9 (depends on 1) The injection needle assembly according to claim 1, further comprising an additional second needle, an additional second liquid port connected to the additional second needle, and an additional second liquid flow path between the first liquid port and the additional second liquid port, wherein the additional liquid flow path is dimensioned so that a pressure drop between the first liquid port and the additional second liquid port is between ±10% to the pressure drop between the first liquid port and each of the N second liquid ports. ### Claim 10 (depends on 1) The injection needle assembly according to claim 1, wherein the main liquid pathways and the secondary liquid pathways are formed in a same piece of material. ### Claim 11 (depends on 1) The injection needle assembly according to claim 1, wherein the main liquid pathways and the secondary liquid pathways are arranged in a plane perpendicular to an injection axis. ### Claim 12 An injection needle assembly, comprising: at least N injection needles where N is at least two and a multiple of two, a first liquid port adapted to be connected to an injection device, N second liquid ports, each connected to only one of the N injection needles, N 2 main liquid pathways each having an entrance connected to the first liquid port and having an exit, wherein the injection needle further comprises N 2 secondary liquid pathways, further including: two extremities each opening on one of the N second liquid ports, and a mid portion connected to the exit of one of the main liquid pathways; and wherein the main liquid pathways and the secondary liquid pathways define N liquid flow paths between the first liquid port and the N second liquid ports and are dimensioned so that a pressure drop between the first liquid port and each of the N second liquid ports is between ±10%. ### Claim 13 (depends on 1) An injection device comprising an injection needle assembly according to claim 1. ### Claim 14 (depends on 12) An injection device comprising an injection needle assembly according to claim 12. ### Claim 15 (depends on 5) The injection needle assembly according to claim 5, wherein: the main liquid pathways have a substantially constant cross-section surface between each others, and the secondary liquid pathways have a substantially constant cross-section surface between each others. ### Claim 16 (depends on 5) The injection needle assembly according to claim 5, further comprising an additional second needle, an additional second liquid port connected to the additional second needle, and an additional second liquid flow path between the first liquid port and the additional second liquid port, wherein the additional liquid flow path is dimensioned so that a pressure drop between the first liquid port and the additional second liquid port is between ±10% to the pressure drop between the first liquid port and each of the N second liquid ports. ### Claim 17 (depends on 7) The injection needle assembly according to claim 7, further comprising an additional second needle, an additional second liquid port connected to the additional second needle, and an additional second liquid flow path between the first liquid port and the additional second liquid port, wherein the additional liquid flow path is dimensioned so that a pressure drop between the first liquid port and the additional second liquid port is between ±10% to the pressure drop between the first liquid port and each of the N second liquid ports. ### Claim 18 (depends on 5) The injection needle assembly according to claim 5, wherein the main liquid pathways and the secondary liquid pathways are formed in a same piece of material. ### Claim 19 (depends on 7) The injection needle assembly according to claim 7, wherein the main liquid pathways and the secondary liquid pathways are formed in a same piece of material. ### Claim 20 (depends on 9) The injection needle assembly according to claim 9, wherein the main liquid pathways and the secondary liquid pathways are formed in a same piece of material. ### Claim 21 An injection needle assembly, comprising: at least N injection needles where N is at least four and a multiple of two, a first liquid port adapted to be connected to an injection device, N second liquid ports, each connected to one of the N injection needles, N 2 main liquid pathways each having an entrance connected to the first liquid port and having an exit, wherein the injection needle assembly further comprises N 2 secondary liquid pathways, further including: two extremities each opening on one of the N second liquid ports, and a mid portion connected to the exit of one of the main liquid pathways; wherein the main liquid pathways and the secondary liquid pathways define N liquid flow paths between the first liquid port and the N second liquid ports and are dimensioned so that a pressure drop between the first liquid port and each of the N second liquid ports is between ±10%, and wherein each of the N liquid flow paths are dimensioned at an angle with respect to an adjacent one of the N liquid flow paths.