CONTACT FREE AXIAL POSITION DETERMINATION OF A MOVING ELEMENT IN A MEDICATION DELIVERY DEVICE

摘要

The present invention relates to a medication delivery device for expelling set doses of medicament, the medication delivery device comprising a position determining arrangement for detecting absolute axial positions of a movably mounted member arranged within the medication delivery device, the position determining arrangement comprising first and second transmitter electrodes arranged on interior surface parts of a housing of the medication delivery device, a receiver electrode arranged on an interior surface part of the housing of the medication delivery device, and a reflector electrode arranged on an exterior surface part of the movably mounted member, the electrode of the movably mounted member being adapted to electrically couple to at least one of the transmitter electrodes and to the receiver electrode.