SENSOR FOR USE WITH A DRUG DELIVERY DEVICE

摘要

An optical decoding system comprising: - an optical sensor integral with or attachable to a housing of a drug delivery device and configured to be directed at first and second rotatable components of a dose setting and dispensing mechanism of the drug delivery device; - a processor configured to: ⋅ cause the optical sensor to capture images of the first and second rotatable components at least at the beginning and end of a medicament dose dispensing process; ⋅ determine a rotational position of both the first and second rotatable components in each of the captured images; and ⋅ determine from the rotational positions of the first and second rotatable components an amount of medicament delivered by the dose setting and dispensing mechanism of the drug delivery device.