Off-axis optical sensor for detecting infusion pump cassette

摘要

An infusion pump (10) has an optical detection system (50) for determining whether or not a cassette (14) of an administration tubing set is properly loaded in the pump. Operation of the pump may be enabled or disabled based on a determination of the optical detection system. The optical cassette detection system includes a light emitter (52) and a corresponding light detector (54) on non- coincident emission and detection axes, and at least one optical element (55) carried by the cassette. When the cassette is properly loaded in the pump, light from the emitter is redirected by the optical element from the emission axis to the detection axis for receipt by the detector, which registers an increased signal level. The detector signal is evaluated by signal evaluation electronics to determine if the detector signal level is above a predetermined threshold, indicating presence of the cassette.