MEDICATION INJECTOR WITH CAPACITIVE FILL LEVEL MEASUREMENT CAPACITY, AND CONTACT SENSOR

摘要

The invention relates to a medication injector (100) for dispensing liquid medications to people. The injector comprises a container (1) which is filled with the liquid (12) and which has an opening (11) at one end for dispensing the liquid (12) and comprises at least one pair of capacitive measuring electrodes (21, 22) arranged opposite each other in the outer region of the container (1), in particular on the wall, for determining the permittivity of the respective medium in the intermediate region between the measuring electrodes, said measuring electrodes being used by the injector to determine the fill level of the container. A shielding (3) is provided which surrounds the measuring electrodes (21, 22) in the manner of a sheath, is arranged around the container (1), and reduces possible external interfering influences on the capacitive measurement, such as those resulting from contact for example. Additionally, a contact sensor (5) is provided which can mark the measurement as invalid.