Arrangement for Detecting a Position of a Plunger

• Main Authors: Draper, Paul Richard, Morris, Anthony Paul, Gilmore, Stephen Francis
• Format: Patent
• Language: English
• Published: 02.12.2021
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; 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; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MEDICAL OR VETERINARY SCIENCE; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TARIFF METERING APPARATUS; TESTING

The invention relates to an arrangement for detecting a position of a plunger (4) relative to a bung (3) in a drug cartridge (1), comprising a proximity sensor (5) located close to a distal end (6) of the plunger (4) facing the bung (3) and aligned to receive light reflected by the bung (3).