Injection device with dose indicator mechanism

Abstract

An injection device comprises a housing () having a longitudinal axis. The injection device further comprises a dose selector () capable of setting a dose to be ejected from the injection device and a dose indicator comprising a units wheel () operatively connectable to the dose selector so that rotation of the dose selector about the longitudinal axis also rotates the units wheel, and a tens wheel () selectively engageable with the units wheel so that rotation of the units wheel also rotates the tens wheel. A biasing means biases the dose indicator axially-rearwardly in the housing. An internal surface of the housing is provided with a tens housing feature selectively engageable with the tens wheel to prevent rotation thereof. An internal surface of the housing is provided with a units housing feature capable of moving the units wheel axially-forward against said biasing means such that the units wheel engages and moves the tens wheel axially-forward and free of said tens housing feature so as to allow rotation thereof.