Patent ID: 6972009

Claim:
A system for controllably regulating the administration of fluid medication to a patient to be anaesthetised with intravenous anaesthesia, said system comprising an infusion container for holding and introducing the fluid medication to a single patient, said infusion container including a connector positioned proximate an outlet of said infusion container through which said infusion container can be filled with, and emptied of, the fluid medication, a reserve container for containing a portion of the fluid medication that can be transferred to said infusion container, said reserve container being useable with multiple patients, a control unit including a circuit for regulating the volume of medication delivered from the infusion container to said patient per unit of time, said control unit operates to empty the fluid medication from said infusion container and transfer small amounts of fluid medication from said reserve container to said infusion container, a tube between said circuit or said infusion container and said patient, a connection arrangement provided to allow the passage of the fluid medication from said infusion container to the patient and from said reserve container to said infusion container, said connection arrangement comprising a first filter, a first one-way valve positioned between said tube and said first filter and a second valve, and a second filter positioned upstream of said connection arrangement between said connection arrangement and said reserve container, at least said first filter and first valve being positioned to separate multi-patient parts including said reserve container from single-patient parts including said infusion container and form an interface preventing contaminating particles from migrating into at least the reserve container.