Abstract: The invention relates to a device for supplying gas to a patient, in particular a patient breathing spontaneously. The device includes a) a metering device (A) which is used to meter the gas to be inhaled by the patient (P) into the gas tank (B), b) a gas tank (B) which is used to store the gas to be inhaled by the patient (P), c) a demand valve (D) which regulates the volume flow of the gas inhaled by the patient (P), d) a reservoir (F) which is used to hold the gas exhaled by the patient (P), e) a carbon dioxide separating unit (G) which is used to separate carbon dioxide from the exhaled gas, f) a pump (H) which is used to return the exhaled gas purified of carbon dioxide into the gas tank (B), and g) an analysis/control unit (J) which analyzes the gas returned to the gas tank (B) and controls the metering device (A) according to the composition of said gas.

Abstract: A monitoring apparatus for monitoring the relative flow rates of first and second gases that are to be mixed comprises a first flow-monitoring, laminar flow element in a first gas flow path for detecting a differential first gas pressure thereacross and a second flow-monitoring, laminar flow element in a second gas flow path for detecting a differential second gas pressure thereacross. A comparator device compares the differential pressures and is operable to generate a response in dependence on said comparison.

Abstract: A monitoring apparatus for monitoring the relative flow rates of first and second gases that are to be mixed comprises a first flow-monitoring, laminar flow element in a first gas flow path for detecting a differential first gas pressure thereacross and a second flow-monitoring, laminar flow element in a second gas flow path for detecting a differential second gas pressure thereacross. A comparator device compares the differential pressures and is operable to generate a response in dependence on said comparison.

Abstract: The invention relates to a device for supplying gas to a patient, in particular a patient breathing spontaneously. Said device comprises a) a metering device (A) which is used to meter the gas to be inhaled by the patient (P) into the gas tank (B), b) a gas tank (B) which is used to store the gas to be inhaled by the patient (P), c) a demand valve (D) which regulates the volume flow of the gas inhaled by the patient (P), d) a reservoir (F) which is used to hold the gas exhaled by the patient (P), e) a carbon dioxide separating unit (G) which is used to separate carbon dioxide from the exhaled gas, f) a pump (H) which is used to return the exhaled gas purified of carbon dioxide into the gas tank (B), and g) an analysis/control unit (J) which analyzes the gas returned to the gas tank (B) and controls the metering device (A) according to the composition of said gas.

Abstract: A method and system for the controlled admixing of at least one gas or gas mixture to a gas (mixture) flow, so that, after the admixing to the gas (mixture) flow, the gas or gas mixture has a preadjusted and/or preadjustable concentration in this gas (mixture) flow by use of a pressure controller.