Absolute position determination of movably mounted member in medication delivery device

• Main Authors: SØRENSEN PETER GRØNNING, VON MÜNCHOW BODO, NIELSEN PREBEN
• Format: Patent
• Language: English
• Published: 31.03.2015
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY; HUMAN NECESSITIES; HYGIENE; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MEDICAL OR VETERINARY SCIENCE; PHYSICS; TARIFF METERING APPARATUS; TESTING

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 positions of a movably mounted member, such as a dose indicator barrel, relative to a housing of the medication delivery device. The position determining arrangement comprises a plurality of electrically conducting electrodes arranged on an outer surface of the movably mounted member, and a plurality of contacts members fixedly arranged relative to the housing of the medication delivery device. A first and a second contact member are arranged to follow a first path across the electrically conducting electrodes upon movement of the movably mounted member relative to the housing, whereas a third and a fourth contact member are arranged to follow a second path across the electrically conducting electrodes upon movement of the movably mounted member relative to the housing.