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1. (WO2016055635) DRUG INJECTION DEVICE WITH RESETTABLE MECHANISM ALLOWING PISTON ROD RETRACTION UPON DRUG CARTRIDGE CHANGE

Pub. No.:    WO/2016/055635    International Application No.:    PCT/EP2015/073443
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Sat Oct 10 01:59:59 CEST 2015
IPC: A61M 5/20
A61M 5/24
A61M 5/315
Applicants: SANOFI
Inventors: EARDLEY, Zoë Georgina
DRAPER, Paul Richard
Title: DRUG INJECTION DEVICE WITH RESETTABLE MECHANISM ALLOWING PISTON ROD RETRACTION UPON DRUG CARTRIDGE CHANGE
Abstract:
The present invention is generally directed to a drug delivery device for selecting and dispensing a number of user variable doses of a medicament. The device comprises a housing (10), a dose setting element (60) rotatable relative to the housing (10) during dose setting and dose dispensing, a drive member (40) coupled to the dose setting member (60) via a clutch (120), and a piston rod (30) coupled to the housing (10) and to the drive member (40). Further, the device further comprises a cartridge holder (20) removably attached to the housing (10) and a reset element (150), which is axially constrained to the dose setting element (60), and at least one spring (130) acting on the reset element (150), such that, if the cartridge holder (20) is detached from the housing (10), the reset element (150) is axially moved relative to the housing (10) into a position in which the dose setting element (60) is rotationally constrained to the housing (10) and the drive member (40) is allowed to rotate relative to the housing (10).