Drug delivery device

A drug delivery device comprising a housing, a delivery unit comprising a drug container, and a control unit mounted within the housing, the control unit comprising an on-body sensing system comprising an electrode connected to an electronic control system of the control unit for measuring a capacitance value configured to detect whether the drug delivery device is positioned against a patient's skin, a skin contact wall of the housing having an inner side facing an inside of the housing in which the delivery unit and control unit are mounted, and an outer mounting side facing the outside of the housing and intended to be placed against the skin of a patient, wherein the electrode comprises a layer of metal mounted directly against the inner side of the skin contact wall, wherein the on-body sensing system comprises a second electrode insulatingly separated from said electrode which constitutes a first electrode, a potential between the first electrode and second electrode being measured to determine a capacitance value.

A drug delivery device comprising a housing, a delivery unit comprising a drug container, and a control unit mounted within the housing, the control unit comprising an on-body sensing system comprising an electrode connected to an electronic control system of the control unit for measuring a capacitance value configured to detect whether the drug delivery device is positioned against a patient's skin, a skin contact wall of the housing having an inner side facing an inside of the housing in which the delivery unit and control unit are mounted, and an outer mounting side facing the outside of the housing and intended to be placed against the skin of a patient, wherein the electrode comprises a layer of metal mounted directly against the inner side of the skin contact wall, wherein the electrode layer of metal consists of a plate of sheet metal stamped and formed from sheet metal, the electrode assembled on the inner side of the skin contact wall.