Patent-family-84536100

The invention relates to a drug delivery system which essentially comprises three major components: a housing structure (10), a reservoir structure (20) and a protective cap structure (30). The housing structure comprises an electronic dose size capture arrangement and first communicating means. The reservoir structure contains the liquid drug and is releasable attachable to the housing structure. The reservoir structure further comprises an identifier which is coded with information relating to the type of drug contained in the reservoir structure. The protective cap, which is mountable on the drug delivery device comprises a sensor arrangement configured to sense the information coded in the identifier and second communication means for communicating the information regarding the type of drug contained in the reservoir structure.