Patent ID: 8632509

Claim:
An injection device for injecting a dose of drug, the injection device comprising: a housing, a dose setting mechanism being operable to set a desired dose, operation of said dose setting mechanism causing energy to be stored in a spring member, the dose setting mechanism defining a first part that rotates during dose setting, an injection mechanism comprising a piston rod adapted to cooperate with a piston positioned in a cartridge containing a drug to be delivered in order to cause a set dose to be delivered from the cartridge via the injection device, said injection mechanism being driven by releasing energy previously stored in said spring member during dose setting, the injection mechanism defining a second part that rotates during dose injection, means for electronically detecting the amount of a set dose, the means for electronically detecting the amount of a set dose being adapted to detect an angular displacement between the first part and the housing, means for electronically detecting the amount of an injected dose, the means for electronically detecting the amount of an injected dose being adapted to detect an angular displacement between the second part and the housing, and electronic display means for displaying a set dose and/or an injected dose to a user.