An injector device for injecting or transfernng a pharmaceutical product froma pharmaceutical cartridge The injector device includes an injector body havinga side wall having a proximal end portion and a distal end portion, the side wallhaving an inner surface and an outer surface, the inner surface of the side walldefining a space for receiving at least a portion of a body of a pharmaceuticalcartridge therein One or more retention members are disposed on the outer surfaceof the body The injector device further includes a plunger rod having a proximalend portion and a distal end portion, the distal end portion of the plunger rodhaving a connection member constructed for connection to a connecting membermounted on a piston associated with a cartridge The plunger rod has one or morereceiving members formed about its length.
