# US 2024/0197995 A1 · A component and a sub-assembly for a medicament delivery device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0197995 A1 - Document ID: US20240197995A1 - Status: Published application - Kind: A1 - Application number: 18/553,605 - Filed: 2022-04-19 - Published: 2024-06-20 - Earliest claimed: 2021-04-28 - Assignees: Shl Medical AG - Applicants: SHL Medical AG - Inventors: Daniel CARLSSON - Web page: https://patentgrep.com/patent/US20240197995A1 ## CPC - A61M 5/2033: {Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287)} - A61M 5/002: {Packages specially adapted therefor, e.g. packages for syringes or needles or kits for diabetics} - A61M 5/20: Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 takes precedence) - A61M 5/24: Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or cartridges, e.g. automatic - A61M 5/3146: {Priming, e.g. purging, reducing backlash or clearance} - A61M 5/31501: {Means for blocking or restricting the movement of the rod or piston (A61M5/5013 takes precedence)} - A61M 5/31511: {Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence)} - A61M 5/31578: {the piston rod being moved by the axial movement of a component directly in contact with it} - A61M 2005/2407: {from the rear} - A61M 2005/31508: {provided on the piston-rod} - A61M 2205/12: with interchangeable cassettes forming partially or totally the fluid circuit - A61M 2205/6045: having complementary physical shapes for indexing or registration purposes - 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 plunger rod (2) for a medicament delivery device, the plunger rod (2) comprising: a plunger rod body (21) extending along a second longitudinal axis (L2) between a proximal end and a distal end; a key (22) attached to the proximal end of the plunger rod body (21); wherein the key (22) is configured to fit into a key slot (13a) on a cassette housing (1), such that when the key (22) and the key slot (13a) are matched, the key (22) followed by the plunger rod body (21) can enter into the cassette housing (1) through the key slot (13a). ## Claims ### Claim 1 A cassette housing (1) for a medicament delivery device cassette unit, the cassette housing (1) comprising: a main body (10) extending along a first longitudinal axis (L1) between a proximal end and a distal end; wherein the main body (10) defines an interior chamber (11) for receiving a medicament container; a distal cover (13) attached to the distal end of the main body (10); wherein the distal cover (13) comprises a covering wall extending across the distal end of the interior chamber (11) of the main body (10) in a direction transverse to the first longitudinal axis (L1); and wherein the covering wall comprises a key slot (13a) configured to receive a key (22) of a plunger rod (2) of the medicament delivery device, such that when the key (22) and the key slot (13a) are matched, the key (22) of the plunger rod (2) followed by a plunger rod body (21) of the plunger rod (2) can enter into the cassette housing (1) through the key slot (13a). ### Claim 2 A plunger rod (2) for a medicament delivery device, the plunger rod (2) comprising: a plunger rod body (21) extending along a second longitudinal axis (L2) between a proximal end and a distal end; a key (22) attached to the proximal end of the plunger rod body (21); wherein the key (22) is configured to fit into a key slot (13a) on a cassette housing (1), such that when the key (22) and the key slot (13a) are matched, the key (22) followed by the plunger rod body (21) can enter into the cassette housing (1) through the key slot (13a). ### Claim 3 A sub-assembly for a medicament delivery device, the sub-assembly comprising: a cassette housing (1) comprising: a main body (10) extending along a first longitudinal axis (L1) between a proximal end and a distal end; wherein the main body (10) defines an interior chamber (11) for receiving a medicament container; a plunger rod body (21) extending along a second longitudinal axis (L2) between a proximal end and a distal end; a key (22) attached to the proximal end of the plunger rod body (21); a distal cover (13) attached to the distal end of the main body (10); wherein the distal cover (13) comprises a covering wall extending across the distal end of the interior chamber (11) of the main body (10) in a direction transverse to the first longitudinal axis (L1); and wherein the covering wall comprises a key slot (13a) configured to receive the key (22) of the plunger rod (2), such that when the key (22) and the key slot (13a) are matched, the key (22) of the plunger rod (2) followed by plunger rod body (21) of the plunger rod (2) can enter into the cassette housing (1) through the key slot (13a). ### Claim 4 (depends on 3) The sub-assembly according to claim 3, comprising a distal body (3) extending along a third longitudinal axis (L3) between a proximal end and a distal end; wherein the distal body (3) is configured be attached to the cassette housing (1); wherein the plunger rod (2) is arranged in the distal body (3) and is telescopic relative to the proximal end of the distal body (3). ### Claim 5 (depends on 4) The sub-assembly according to claim 4, wherein the cassette housing comprises a proximal engaging member attached at the distal end of the main body of the cassette housing; wherein the distal body comprises a distal engaging member attached to the proximal end of the distal body; and wherein the cassette housing is attached to the distal body when the proximal engaging member is fastened to the distal engaging member. ### Claim 6 (depends on 5) The sub-assembly according to claim 5, wherein the proximal engaging member is configured to be fastened to the distal engaging member in the direction of the third longitudinal axis (L3) through a bayonet connection. ### Claim 7 (depends on 6) The sub-assembly according to claim 6, wherein the proximal engaging member is a bayonet protrusion; and wherein the distal engaging member is a bayonet slot. ### Claim 8 (depends on 5) The sub-assembly according to claim 5 wherein the proximal engaging member is positioned closer to the proximal end of the cassette housing than a distal end of the distal cover; and wherein the key of the plunger rod protrudes beyond at least a portion of the distal engaging member in the proximal direction of the distal body. ### Claim 9 (depends on 3) The sub-assembly according to claim 3, wherein the key of the plunger rod is rotationally fixed to the plunger rod body; and wherein the plunger rod body is rotatable around the second longitudinal axis (L2) from a first position to a second position. ### Claim 10 (depends on 9) The sub-assembly according to claim 9, wherein the key of the plunger rod is misaligned with the key slot of the distal cover of the cassette housing in the circumferential direction relative to the first longitudinal axis (L1) when the plunger rod is in the first position and at least a portion of the proximal engaging member is aligned with the distal engaging member in the direction of the first longitudinal axis (L1). ### Claim 11 (depends on 3) The sub-assembly according to claim 3, wherein the distal body is configured to receive an energy source of the medicament delivery device, the energy source is configured to connect to the plunger rod for driving the plunger rod relative to the distal body. ### Claim 12 (depends on 4) The sub-assembly according to claim 4, wherein the plunger rod is configured to move along the third longitudinal axis (L3) in the distal direction relative to the distal body from a first position to a second position when the energy source of the medicament delivery device received in the distal body has sufficient power to carry out a medicament delivery operation. ### Claim 13 (depends on 1) A method of assembling a medicament delivery device comprising: the cassette housing according to claim 1, and an elongated plunger rod extending along a second longitudinal axis (L2) between a proximal end and a distal end, the method comprising the steps of: inserting a medicament container into the interior chamber of the cassette housing; covering the interior chamber from the distal end of the cassette housing with a distal cover, wherein the distal cover comprises a key slot perpendicular to the first longitudinal axis (L1); attaching a key that is matched with the key slot to a proximal end of the plunger rod. ### Claim 14 (depends on 13) The method of assembling a medicament delivery device according to claim 13, the method further comprising the steps of: selecting a distal cover with a key slot in a certain geometry according to the medicament contained within the inserted medicament container before covering the interior chamber from the distal end of the cassette housing with the distal cover. ### Claim 15 (depends on 13) The method of assembling a medicament delivery device according to claim 13, the method further comprising the steps of: selecting a key with a certain geometry according to the medicament contained within the inserted medicament container before attaching the key to the proximal end of the plunger rod.