ASSEMBLY FOR DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE Russian patent published in 2019 - IPC A61M5/315 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, specifically to assemblies for a drug delivery device. Assembly includes a cartridge containing a plurality of doses of a drug, and a piston rod, adapted and arranged to expel the drug from the cartridge during a dose delivery operation of the assembly, the piston rod comprising a thread. Assembly further comprises a nut member, wherein the nut member is adapted and arranged to be rotated with respect to the piston rod about a rotational axis during a dose setting operation of the assembly, the nut member thereby being axially displaced along the piston rod from a start position towards an end position with respect to the piston rod due to mechanical cooperation of the nut member with the thread. Assembly further comprises a last dose stop mechanism adapted and arranged to prevent a user from setting a dose of the drug which exceeds a remaining amount of drug in the cartridge, the last dose stop mechanism comprising at least one first interaction member and at least one second interaction member provided by the piston rod, and at least one first stop member and at least one second stop member provided by the nut member, wherein the interaction members and the stop members are configured to mechanically cooperate with one another when the nut member is in the end position with respect to the piston rod such that further relative movement of the nut member and the piston rod for setting a dose of the drug is prevented. Furthermore, a drug delivery device is described.

EFFECT: object of the present disclosure to facilitate provision of an improved drug delivery device.

13 cl, 12 dwg