A sterile device designed to be used in conjunction with an infusion pump or a device containing an infusion pump (e.g., a physiology-monitoring sedation system, physiology-monitoring anaesthesia system), for the delivery of an intravenous (IV) medication (e.g., a sedative or anaesthetic) contained within an independent drug vial. The cassette is inserted into the infusion pump and the drug vial is inserted into the cassette; the cassette tubing interfaces with the pump drive mechanism for medication delivery through connection with an infusion administration set. This is a single-use device.