# US 10,117,998 B2 · Assembly for a drug delivery device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,117,998 B2 - Document ID: US10117998B2 - Status: Granted - Kind: B2 - Application number: 14/770,835 - Filed: 2014-03-10 - Published: 2016-01-14 - Granted: 2018-11-06 - Earliest claimed: 2013-03-11 - Assignees: Sanofi-Aventis Deutschland GmbH - Applicants: Sanofi-Aventis Deutschland GmbH - Inventors: Michael Jugl; Axel Teucher - Web page: https://patentgrep.com/patent/US10117998B2 ## CPC - A61M 5/31541: {Means preventing setting of a dose beyond the amount remaining in the cartridge} - A61M 5/31555: {by purely axial movement of dose setting member, e.g. during setting or filling of a syringe} - 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 2205/581: by audible feedback - A61M 2205/582: by tactile feedback - A61M 2205/583: by visual feedback - 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 An assembly for a drug delivery device is provided, the assembly comprising an actuator which is configured to perform a setting movement in a proximal direction in order to set a dose of a drug, and which is configured to perform a dispense movement in a distal direction in order to dispense a dose of a drug. The assembly further comprises stop mechanism acting after a maximum amount of a drug has been delivered, which is configured to axially constrain the setting movement of the actuator such that the setting of a dose is inhibited, wherein a limited axial movement of the actuator is allowed. ## Claims ### Claim 1 An assembly for a drug delivery device, comprising an actuator which is configured to perform a setting movement in a proximal direction in order to set a dose of a drug, and which is configured to perform a dispense movement in a distal direction in order to dispense a dose of a drug, and comprising a stop mechanism acting after a maximum amount of a drug has been delivered, and which is configured to axially constrain the setting movement of the actuator such that the setting of a dose is inhibited, wherein, after the maximum amount of the drug has been delivered, a limited axial movement of the actuator is allowed before a stop element of the stop mechanism abuts a last dose stop to axially constrain the setting movement; wherein the assembly further comprises a spring mechanism which is configured such that it biases the actuator in the distal direction after the actuator has performed the limited axial movement in the proximal direction; a piston rod configured to rotate and axially move in a distal direction during the dispensing of a dose; and a drive member coupled to the actuator, wherein the drive member comprises a ramp feature on an outer surface of the drive member, wherein the spring mechanism is configured to, during the limited axial movement, slide along and act on a proximal ramp surface of the ramp feature without reaching a top point of the ramp feature, thereby causing the spring mechanism to exert a force on the proximal ramp surface, so as to bias the ramp feature, the drive member, and the actuator in the distal direction. ### Claim 2 (depends on 1) The assembly according to claim 1, wherein the drive member is coupled to the actuator such that a movement of the drive member causes a movement of the actuator and vice versa. ### Claim 3 (depends on 1) The assembly according to claim 1, wherein the ramp feature is configured as a triangular protrusion. ### Claim 4 (depends on 1) The assembly according to claim 1, wherein the spring mechanism comprises at least one resilient arm. ### Claim 5 (depends on 4) The assembly according to claim 4, where the ramp feature comprises a distal ramp surface and the proximal ramp surface, wherein the at least one resilient arm slides along the proximal ramp surface and the distal ramp surface during the setting and during the dispensing of a dose. ### Claim 6 (depends on 4) The assembly according to claim 4, wherein the at least one resilient arm is configured to deflect in a radial direction with respect to a longitudinal axis of the device during the setting and dispensing of a dose. ### Claim 7 (depends on 5) The assembly according to claim 5, wherein the at least one resilient arm exerts a force on the proximal ramp surface when the actuator has performed the limited axial movement in the dose setting direction. ### Claim 8 (depends on 5) The assembly according to claim 5, wherein the at least one resilient arm is configured to exert the force on the proximal ramp surface which is directed in a radial inward direction and thereby biases the actuator in the distal direction towards a dispensing end of the device. ### Claim 9 (depends on 1) The assembly according to claim 1, wherein the drive member is in engagement with the piston rod. ### Claim 10 (depends on 9) The assembly according to claim 9, comprising an internal housing which is engaged with the piston rod, wherein the at least one resilient arm is located at the internal housing. ### Claim 11 (depends on 9) The assembly according to claim 9, wherein the drive member is configured to drive the piston rod towards a dispensing end of the device during the dispensing of a dose. ### Claim 12 (depends on 9) The assembly according to claim 9, wherein the drive member is configured to perform an axial and non-rotational movement with respect to the piston rod during the setting of a dose.