A drug delivery device comprises a lead screw (22) having a longitudinal axis, a distal end and a proximal end that is axially movable in a distal direction relative to a mid-body (20), the lead screw (22) including a threaded shaft (33), wherein the lead screw (22) has a keyway (32) positioned parallel to the longitudinal axis and containing a first section of a dose dispensing feedback component (80)； the mid-body (20) being designed to prevent rotation of the lead screw (22) with respect to the mid-body (20), where the mid-body (20) contains a second section (81 ) of the dose dispensing feedback component.
