# US 12,594,383 B2 · Lock mechanism 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 12,594,383 B2 - Document ID: US12594383B2 - Status: Granted - Kind: B2 - Application number: 18/025,711 - Filed: 2021-10-12 - Published: 2023-11-09 - Granted: 2026-04-07 - Earliest claimed: 2020-10-14 - Assignees: Shl Medical AG - Applicants: Shl Medical AG - Inventors: Gary Calderwood; Björn Krohn; Joakim Lindholm; Tilde Rolder - Web page: https://patentgrep.com/patent/US12594383B2 ## CPC - A61M 5/3243: {being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel (devices for protecting guide needles in combination with catheters A61M25/0612)} - A61M 5/20: Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 takes precedence) - 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 5/31566: {Means improving security or handling thereof} - A61M 5/31571: {Means preventing accidental administration (for automatic syringes A61M5/20)} - A61M 5/3202: {Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; protectors for sharps A61B50/3001)} - A61M 5/3245: {Constructional features thereof, e.g. to improve manipulation or functioning} - A61M 5/3204: {Needle cap removers, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices} - A61M 2005/2073: {preventing premature release, e.g. by making use of a safety lock} - 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 The application describes lock mechanisms for medicament delivery devices. The lock mechanisms extend from a proximal end to a distal end in an axial direction relative to a longitudinal axis, the lock mechanisms can have a housing, a medicament delivery member guard and a cap. The lock mechanisms can also include a protrusion extending in a radial direction relative to the longitudinal axis and a recess or cut-out. Various related medicament delivery devices, medicament delivery device components, sub-assemblies and methods are also described. ## Claims ### Claim 1 A lock mechanism for a medicament delivery device, the lock mechanism extending from a proximal end to a distal end in an axial direction relative to a longitudinal axis, the lock mechanism comprising a housing, a medicament delivery member guard and a cap, wherein one of the medicament delivery member guard and the housing comprises a flexible arm, the flexible arm comprising a protrusion at a proximal end of the flexible arm and extending in a radial direction relative to the longitudinal axis, wherein the other of the medicament delivery member guard and the housing comprises a recess or cut-out, wherein the protrusion of the flexible arm is configured to be received in the recess or cut-out, wherein the flexible arm is between the cap and the other of the medicament delivery member guard and the housing, and wherein the cap is adjacent to the flexible arm in a radial direction relative to the longitudinal axis. ### Claim 2 (depends on 1) The lock mechanism of claim 1, wherein the housing extends around the medicament delivery member guard, and wherein the housing comprises the flexible arm and the medicament delivery member guard comprises the recess or cut-out. ### Claim 3 (depends on 1) The lock mechanism of claim 1, wherein the proximal end of the cut-out or recess is spaced apart in a longitudinal direction from the protrusion. ### Claim 4 (depends on 1) The lock mechanism of claim 1, wherein the recess or cut-out is a first recess or cut-out, and the other of the medicament delivery member guard and the housing comprises a second recess or cut-out that is closer to the proximal end than the first recess or cut-out, and wherein the second recess or cut-out is aligned with the first recess or cut-out in a direction of the longitudinal axis. ### Claim 5 (depends on 1) The lock mechanism of claim 1, wherein the cap, the housing and the medicament delivery member guard are arranged so that prior to removal of the cap, the housing is blocked from moving in the radial direction and the medicament delivery member guard is thereby blocked from moving in a distal direction, and so that after removal of the cap, the housing can move in the radial direction and the medicament delivery member guard can therefore push the housing in the radial direction to move past the housing in the distal direction. ### Claim 6 (depends on 1) A medicament delivery device comprising a lock mechanism as described in claim 1. ### Claim 7 (depends on 6) The medicament delivery device of claim 6, wherein the medicament delivery device comprises a housing, and wherein the protrusion and/or the flexible arm is inside the housing. ### Claim 8 (depends on 7) The medicament delivery device of claim 7, wherein a proximal end of the protrusion and/or a proximal end of the flexible arm is distal to the proximal end of the housing. ### Claim 9 A lock mechanism for a medicament delivery device, the lock mechanism extending from a proximal end to a distal end in an axial direction relative to a longitudinal axis, the lock mechanism comprising a housing, a medicament delivery member guard and a cap, wherein one of the medicament delivery member guard and the cap comprises a protrusion extending in a radial direction relative to the longitudinal axis, wherein the other of the medicament delivery member guard and the cap comprises a recess or cut-out, wherein the protrusion is in the recess or cut-out, wherein the medicament delivery member guard is moveable in a direction of a longitudinal axis relative to the housing from a locked position to an unlocked position, wherein in the locked position, movement of the protrusion relative to the recess or cut-out is restricted by a wall of the housing, and in the unlocked position, the movement of the protrusion relative to the recess or cut-out is no longer restricted by the wall of the housing, thereby allowing the protrusion to be moved out of the recess or cut-out and the cap to be removed from the medicament delivery member guard. ### Claim 10 (depends on 9) The lock mechanism of claim 9, wherein at least one of the cap and the medicament delivery member guard comprises a flexible portion. ### Claim 11 (depends on 10) The lock mechanism of claim 10, wherein the flexible portion is a flexible arm of the cap. ### Claim 12 (depends on 11) The lock mechanism of claim 11, wherein the recess or cut-out is in the flexible arm. ### Claim 13 (depends on 9) The lock mechanism of claim 9, wherein the cap comprises a cap housing and a cap insert, and the cap housing is rotatable relative to the cap insert. ### Claim 14 (depends on 9) The lock mechanism of claim 9, wherein the cap comprises a distally facing surface abutting a proximally facing surface of the housing, and wherein the distally facing surface of the cap and the proximally facing surface of the housing each describe a sinusoidal pattern in a circumferential direction relative to the longitudinal axis. ### Claim 15 A lock mechanism for a medicament delivery device, the lock mechanism extending from a proximal end to a distal end in an axial direction relative to a longitudinal axis of the medicament delivery device, where the lock mechanism comprises: a housing; a medicament delivery member guard; and a cap, wherein one of the medicament delivery member guard and the housing comprises a flexible arm, the flexible arm comprising a protrusion at a proximal end of the flexible arm and extending in a radial direction relative to the longitudinal axis, wherein the other of the medicament delivery member guard and the housing comprises a first recess or cut-out and a second recess or cut-out, wherein the protrusion is configured to be received in the first recess or cut-out, wherein the flexible arm is between the cap and the other of the medicament delivery member guard and the housing, and wherein the cap is adjacent to the flexible arm in a radial direction relative to the longitudinal axis. ### Claim 16 (depends on 15) The lock mechanism of claim 15, wherein the second recess or cut-out is closer to the proximal end than the first recess or cut-out, and wherein the second recess or cut-out is aligned with the first recess or cut-out in a direction of the longitudinal axis. ### Claim 17 (depends on 15) The lock mechanism of claim 15, wherein the cap, the housing and the medicament delivery member guard are arranged so that prior to removal of the cap, the housing is blocked from moving in the radial direction and the medicament delivery member guard is thereby blocked from moving in a distal direction, and so that after removal of the cap, the housing can move in the radial direction and the medicament delivery member guard can therefore push the housing in the radial direction to move past the housing in the distal direction. ### Claim 18 (depends on 15) The lock mechanism of claim 15, wherein the cap comprises a cap housing and a cap insert, and the cap housing is rotatable relative to the cap insert.