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US 5,509,406 AGranted
Anesthesia device
AssigneeSiemens Elema AB
InventorsMikael Kock, Georgios Psaros, Goran Skog
Life of this patent
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Abstract
An anesthesia system has a fresh gas source for supplying a defined flow of fresh respiratory gas to a respiratory circuit wherein the flow is regulated by a flow valve which is controlled on the basis of a flow measured by a flow meter. The anesthesia system is permits the flow meter to be calibrated while the system is in operation to permit the supply of a continuous, or substantially continuous, flow of fresh respiratory gas to the respiratory circuit.
Claims7
An anesthesia system comprising:
- a respiratory circuit connectable to a patient which delivers a respiratory gas to the patient during an inspiratory phase and which conveys expired respiratory gas from the patient during an expiratory phase;
- a fresh gas source containing fresh respiratory gas;
- a fresh gas line connecting said fresh gas source to said respiratory circuit;
- a flow meter disposed in said fresh gas line which measures a flow of fresh respiratory gas being supplied to said respiratory circuit from said fresh gas source, said flow meter requiring periodic calibration;
- a flow valve disposed in said fresh gas line which regulates the flow of fresh respiratory gas therein;
- and
- control means connected to the flow meter and the flow valve for operating said flow valve dependent on a measured flow of fresh respiratory gas measured by said flow meter for delivering a defined flow of fresh respiratory gas to the respiratory circuit and for calibrating the flow meter independently of the inspiratory phase and the expiratory phase for maintaining substantially continuous control of said flow valve.
4 more elements
Dependencies are inferred from the claim text.