Patent ID: 7703455
Filing Date: 2010-04-27
Classification: A61M

Abstract:
1. An apparatus for supplying respiratory gas to a patient, including: a ring line with circulation of the respiratory gas; a patient connection communicating with the ring line; a respiratory gas feeder unit comprising a blower for generating a circulation of respiratory gas in the ring line; a carbon dioxide absorber through which respiratory gas flows; metering devices for respiratory gas components, which are connected to the ring line on a leading side of the carbon dioxide absorber; a first respiratory gas analyzer for measuring concentrations of respiratory gas components on a trailing side of the carbon dioxide absorber; a second respiratory gas analyzer for measuring concentrations of respiratory gas components at the patient connection; a regulating device for the proportion of respiratory gas components in the respiratory gas, said regulating device, as a function of the concentration of respiratory gas components, measured with one of the respiratory gas analyzers, controls the delivery of respiratory gas components such that the difference between a predetermined concentration and a measured concentration at the patient connection is minimized; and means for performing a plausibility comparison between measured concentration values of the first respiratory gas analyzer and the second respiratory gas analyzer, wherein one of the metering devices is an anesthesia dosing/metering device; and the respective respiratory gas component is anesthetic agent vapor, wherein one of the metering devices comprises a gas mixer; and the respective respiratory gas component is oxygen in combination with laughing gas or air, wherein the anesthesia dosing/metering device and the gas mixer communicate with the ring line via separate lines, and wherein a first flow rate meter is provided on the trailing side of the gas mixer and a second flow rate meter is provided on the trailing side of the anesthesia dosing/metering device; and the plausibility comparison is performed between the measured values of the flow rate meters and the measured values of the first respiratory gas analyzer or the second respiratory gas analyzer.