US Patent 7856978 Process for operating an anesthesia apparatus

An anesthesia apparatus with a breathing circuit (1) has improved initiation of anesthesia for the patient. The gas mixture dispensed into the breathing circuit (1) is circulated in a first operating state without release to a patient until a preset anesthetic concentration is set in the breathing circuit (1). The respiration of the patient connected to the anesthesia apparatus takes place in a subsequent second operating state with the gas mixture set in the first operating state.