An injector device for injecting or transferring a pharmaceutical product froma pharmaceutical cartridge The injectordevice includes an injector body having a side wall having a proximal endportion and a distal end portion, the side wall having aninner surface and an outer surface, the inner surface of the side walldefining a space for receiving at least a portion of a body of apharmaceutical cartridge therein One or more retention members are disposed onthe outer surface of the body The injector devicefurther includes a plunger rod having a proximal end portion and a distal endportion, the distal end portion of the plunger rod having aconnection member constructed for connection to a connecting member mounted ona piston associated with a cartridge The plungerrod has one or more receiving members formed about its length.
