US 12,465,692 B2
Dosing mechanism with rotational end stop mechanism for terminating dose dispense
Michael Jugl, Frankfurt am Main (DE); and Stefan Blancke, Frankfurt am Main (DE)
Assigned to Sanofi, Paris (FR)
Appl. No. 17/781,906
Filed by Sanofi, Paris (FR)
PCT Filed Dec. 3, 2020, PCT No. PCT/EP2020/084385
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/110801, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 19306587 (EP), filed on Dec. 6, 2019.
Prior Publication US 2023/0014860 A1, Jan. 19, 2023
Int. Cl. A61M 5/315 (2006.01)
CPC A61M 5/31501 (2013.01) [A61M 5/31541 (2013.01); A61M 5/31551 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dosing mechanism for a drug delivery device for selecting and dispensing user-variable doses of a medicament, the dosing mechanism comprising:
a housing;
a piston rod;
a driving mechanism for rotating one or both of the piston rod and a movement application component that is directly engaged with the piston rod in a dispense rotational direction with respect to the housing for dose dispense; and
a rotational end stop mechanism for terminating dose dispense, the rotational end stop mechanism comprising:
a first engagement means that is rotationally fixed with respect to one or both of the piston rod and the movement application component, and
a second engagement means that is prevented from rotation with respect to the housing in the dispense rotational direction at an end of the dose dispense,
wherein the second engagement means is not directly engaged with the first engagement means during dose dispense, and
wherein the second engagement means, at the end of dose dispense, directly engages the first engagement means and constitutes a rotational stop for the first engagement means to prevent the first engagement means from further rotation in the dispense rotational direction with respect to the housing.