Injection device with dose indicator mechanism

An injection device comprising:

• a. a housing;
• b. a dose indicator positioned within the housing;
• and
• c. a dose selector operatively connectable to the dose indicator, the dose selector and the dose indicator being capable of cooperating with one another to set a dose to be ejected from the injection device,
• wherein the dose indicator comprises an odometer including:
• i. a units wheel operatively connected to the dose selector so that rotation of the dose selector also rotates the units wheel, and
• ii. a tens wheel selectively engageable with the units wheel so that rotation of the units wheel also rotates the tens wheel,
• wherein the dose indicator further comprises an axially-moveable shuttle lock rotationally locked to the tens wheel and selectively engageable with the units wheel and the housing;
• wherein the tens wheel is selectively engageable with the units wheel via said shuttle lock;
• and
• wherein, when the tens wheel is not engaged with the units wheel, the shuttle lock is rotationally locked to the housing,
• wherein the internal surface of the housing further comprises an axially-extending rib for limiting rotation of the tens wheel.