The present invention relates to electronically assisted
drug delivery devices (100). The
drug delivery device may include a
Gray code type
detector for sensing dosage data, wherein the
detector comprises a code track consisting of a sequence of alternating markings and a plurality of detectors that are mutually spaced in a direction extending along the code track. The
drug delivery device may also include a dosage selector (260) which is moved in a proximal direction upon
dose setting and in a distal direction upon
dose injection, where the dosage selector is latched in the end of
dose position by a latching element, the latching element actuating an end of dose switch for signalling the end of dose state. The
drug delivery device may also incorporate power-management arrangements which effectively minimizes
power consumption for the incorporated electronic circuitry.