US 12,434,006 B2
Assembly for a drug delivery device, drug delivery device and method for producing a drug delivery device
Stefan Blancke, Frankfurt am Main (DE); and Michael Jugl, Frankfurt am Main (DE)
Assigned to Sanofi, Paris (FR)
Appl. No. 17/297,959
Filed by Sanofi, Paris (FR)
PCT Filed Dec. 2, 2019, PCT No. PCT/EP2019/083217
§ 371(c)(1), (2) Date May 27, 2021,
PCT Pub. No. WO2020/114929, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 18306607 (EP), filed on Dec. 4, 2018.
Prior Publication US 2022/0096755 A1, Mar. 31, 2022
Int. Cl. A61M 5/315 (2006.01); A61M 5/24 (2006.01)
CPC A61M 5/31568 (2013.01) [A61M 5/2422 (2013.01); A61M 5/31551 (2013.01); A61M 5/31581 (2013.01); A61M 5/31593 (2013.01); A61M 2207/00 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An assembly for a drug delivery device, comprising
a housing having a proximal end and a distal end;
a dose setting and drive mechanism comprising:
a dose setting member which is moveable relative to the housing in a dose setting operation from an initial position to a dose set position in order to set a dose of drug; and
a piston rod which, after the dose setting operation, is displaceable in a distal direction relative to the housing in a dose delivery operation of the dose setting and drive mechanism, wherein, during the dose delivery operation, the piston rod is displaced relative to the housing by a displacement distance which is determined by the set dose;
a guide track;
a tracking member which is configured to cooperate with the guide track; and
a coupling mechanism which is configured to operatively couple the tracking member to the dose setting and drive mechanism, wherein the coupling mechanism has two different states, a coupled state and a non-coupled state;
wherein, in the coupled state, a coupling interface is established, wherein the tracking member is operatively coupled to the dose setting and drive mechanism via the coupling interface such that in the dose setting operation a distance between the tracking member and an end position of the tracking member along the guide track is reduced by an amount which is determined by the dose which is set in the dose setting operation; and
wherein, in the non-coupled state, the coupling interface is not established, wherein the coupling mechanism is configured to be switchable from the non-coupled state into the coupled state, and wherein the assembly is configured such that in order to enable switching from the non-coupled state to the coupled state at least one dose delivery operation of the dose setting and drive mechanism has to be initiated.