Injection device

An injection device, comprising:

• a housing with a receptacle for a product;
• a dosing mechanism for setting a product dosage to be administered and for displaying the set product dosage;
• a dispensing mechanism for dispensing the product, the dispensing mechanism comprising a piston rod, which is moveable relative to the housing in a dispensing direction in order to eject the set product dosage in a dispensing stroke corresponding to the set product dosage;
• at least one sleeve, which is movable relative to the housing in order to eject the set product dosage;
• a stop wheel coupled to the at least one sleeve such that the stop wheel is movable relative to the housing and the at least one sleeve during setting of the product dosage and together with the at least one sleeve relative to the housing during ejection of the set product dosage;
• at least a first detector for detecting movement of the stop wheel relative to the housing and/or the at least one sleeve;
• and
• a data processing unit connected to the first detector for reading, storing, processing, transmitting, and/or displaying signals received from the first detector;
• wherein the first detector and the data processing unit are adapted to detect start and stop of a rotational movement of the stop wheel, an angle of rotation of the rotational movement of the stop wheel, and a direction of the rotational movement of the stop wheel.