# US 10,117,997 B2 · Dispensing mechanism for a medical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,117,997 B2 - Document ID: US10117997B2 - Status: Granted - Kind: B2 - Application number: 14/776,226 - Filed: 2014-03-14 - Published: 2016-02-11 - Granted: 2018-11-06 - Earliest claimed: 2013-03-14 - Assignees: Norton Healthcare Limited - Applicants: Norton Healthcare Limited - Inventors: Neil Cammish; Mark Horlock - Web page: https://patentgrep.com/patent/US10117997B2 ## CPC - A61M 5/31536: {Blocking means to immobilize a selected dose, e.g. to administer equal doses} - A61M 5/31555: {by purely axial movement of dose setting member, e.g. during setting or filling of a syringe} - A61M 5/3156: {using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals} - A61M 5/31575: {using scaling up or down transmissions, e.g. gearbox} - A61M 5/3158: {the component being manually operated or triggered by an axially moving actuator operated by user, e.g. an axially movable injection button} - A61M 5/31585: {the component being manually operated or triggered by an axially moving actuator operated by user, e.g. an axially movable injection button} - A61M 5/31595: {Pre-defined multi-dose administration by repeated overcoming of means blocking the free advancing movement of piston rod, e.g. by tearing or de-blocking} - A61M 5/24: Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or cartridges, e.g. automatic - A61M 5/31556: {Accuracy improving means} - A61M 2005/2411: {from the front} - A61M 2005/3126: {related to dosing} - 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 dispensing mechanism for administering a dosage of a medicament includes dosage setting means (7) for setting the dosage of a medicament to be administered; expelling means (15) for expelling a medicament from a medicament container; and coupling means (21) operatively coupled with the dosage setting means (7) and the expelling means (15), wherein the coupling means (21) is arranged to convert displacement of the dosage setting means (7) into a displacement of the expelling means (15) in a first direction, wherein the expelling means (15) includes a ratchet means (18a, 18b), and wherein the mechanism includes a first and a second independently moveable resisting pawl (14a, 14b) means facing a common side of the ratchet means (18), the first and the second resisting pawl means (14a, 14b) being configured to engage with the ratchet means (18a, 18b) and resist displacement of the expelling means (15) in a second direction opposite to said first direction. ## Claims ### Claim 1 A dispensing mechanism for administering a dosage of a medicament, the mechanism comprising: a housing; a dosage setting element for setting a single dose of the medicament to be administered from a cartridge containing multiple dosages of the medicament, the dosage setting element being moveable axially by a user in a first direction for setting the dose and moveable axially by a user in a second direction for administering the dose; and an indication element to indicate a set dose of the medicament, the indication element being arranged to be displaced axially and linearly relative to said housing by a predetermined movement of the dosage setting element, the indication element being rotationally fixed relative to the housing; and wherein the dispensing mechanism further includes a conversion element configured, during linear displacement of the indication element relative to the dosage setting element, to convert a linear movement of the dosage setting element of a first magnitude relative to said housing into a linear movement of the indication element of a second magnitude relative to said housing, and wherein said first magnitude of linear movement is different from said second magnitude of linear movement. ### Claim 2 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the first magnitude of movement is greater than the second magnitude of movement. ### Claim 3 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the first magnitude of movement is smaller than the second magnitude of movement. ### Claim 4 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the conversion element is configured to move the indication element during all movement of the dosage setting element. ### Claim 5 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the conversion element comprises a lever. ### Claim 6 (depends on 5) The dispensing mechanism as claimed in claim 5, wherein the lever is configured to act about a fulcrum provided by the dosage setting element. ### Claim 7 (depends on 5) The dispensing mechanism as claimed in claim 5, wherein the lever is resiliently flexible. ### Claim 8 (depends on 5) The dispensing mechanism as claimed in claim 5, wherein the lever is pivotally attached to said housing. ### Claim 9 (depends on 5) The dispensing mechanism as claimed in claim 5, wherein the lever is formed integrally with said housing. ### Claim 10 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element is movable within a guide channel. ### Claim 11 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element is slidingly supported in, on, or by the housing. ### Claim 12 (depends on 1) The dispensing mechanism as claimed in claim 1, further comprising a resisting element arranged to resist movement of the indication element relative to movement of the dosage setting element. ### Claim 13 (depends on 12) The dispensing mechanism as claimed in claim 12, wherein the resisting element comprises a protrusion receivable in one or more corresponding recesses. ### Claim 14 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the dispensing mechanism includes an aperture through which at least a portion of the indication element is exposed to a user. ### Claim 15 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element comprises at least one of tactile and visual indications. ### Claim 16 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element is moved directly by the dosage setting element. ### Claim 17 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element is moved indirectly by the dosage setting element. ### Claim 18 (depends on 1) The dispensing mechanism as claimed in claim 1, wherein the indication element is further rotationally fixed relative to the dosage setting element. ### Claim 19 (depends on 1) A medical device comprising the dispensing mechanism according to claim 1.