Drug delivery device for delivery of two or more independently user selectable multiple doses of medicaments with user operable variable dose locking mechanisms

A drug delivery device capable of delivering two or more medicaments, at least one of which may be delivered in a variable dose, said device comprising:

• (A) two or more housings;
• (B) a common needle hub;
• (C) a dispensing interface;
• (D) an activation mechanism;
• and
• (E) a user operable variable dose locking mechanism,
• wherein:
• (I) each of said housings comprises:
• (a) a dose setting mechanism;
• (b) a dose delivery mechanism;
• and
• (c) a removable medicament cartridge,
• wherein said dose setting mechanism comprises:
• (i) a dose setter and
• (ii) a dose drum comprising:
• a helical groove on an outer surface thereof and
• a longitudinal groove, and
• (II) said user operable variable dose locking mechanism is capable of locking and unlocking the dose setting mechanism and the dose delivery mechanism, and wherein said locking mechanism comprises:
• (a) a knob;
• (b) a spring having a proximal end and a distal end;
• and
• (c) a bracket having a proximal end and a distal end, mounted on the housing,
• wherein said knob is located towards the distal end of said bracket, and wherein the knob comprises:
• (i) an upper surface;
• (ii) a lower surface;
• (iii) a vertical surface;
• and
• (iv) a protrusion located in a middle portion of said lower surface,
• wherein the knob protrusion is selectively capable of alignment with the longitudinal groove of the dose drum and the helical groove of the dose drum;
• and wherein the knob protrusion can be slid in a proximal direction from alignment with the longitudinal groove of the dose drum and into alignment with the helical groove of the dose drum in order to move the dose setter from a locked to an unlocked condition, respectively.