An injection device comprising a housing, a receptacle for receiving a medicine cartridge and configured for attachment to a proximal end of the housing, and a leadscrew having an end for engaging with a bung of a cartridge. The leadscrew has a first thread extending axially along an outer surface thereof and has at least one axially extending guide track. The injection device further comprises a rotatable drive mechanism for engaging with said first thread or said guide track and a guiding element for engaging with the other of said first thread or said guide track, the guiding element being non-rotatable with respect to the housing at least during an injection operation, whereby rotation of the drive mechanism causes said leadscrew to move axially in a proximal direction in order to deliver a dose from the cartridge. The injection device further comprises a stop member located proximal to said rotatable drive mechanism and said guiding element. The stop member is engaged with the or each guide track of said leadscrew to allow relative axial movement of the leadscrew and the stop member while causing the two components to rotate together, said stop member and a profile of the or each guide track being configured to define an end stop for the leadscrew in the proximal direction.La présente invention concerne un dispositif d'injection comprenant un logement, un réceptacle destiné à recevoir une cartouche de médicament et conçu pour se fixer sur une extrémité proximale du logement, et une tige filetée dont une extrémité est destinée à s'engrener avec un bouchon d'une cartouche. La tige filetée comprend un premier filetage s'étendant axialement le long d'une surface extérieure de ladite vis et elle possède au moins un rail de guidage s'étendant axialement. Le dispositif d'injection comprend en outre un mécanisme d'entraînement rotatif destiné à venir en prise avec l'un ou l'autre dudit premier filetage et dudit rail de guidage, et un élément de guidage destiné à venir
