Patent ID: 6830048
Filing Date: 2004-12-14
Classification: A61M,B01F

Abstract:
A device for mixing at least a first gas component with a second gas component, the device comprising:a respiration connection; a propellant gas container; a mixing chamber; a plurality of ejectors including a smaller ejector with a propellant gas flow of up to 5 liters per minute and with a suction flow of up to 30 liters per minute, said smaller ejector having a first propellant gas flow connection for feeding the first gas component from the propellant gas container, a first suction channel for feeding the second gas component from said mixing chamber, and a first gas outlet leading to said respiration connection, and said plurality of ejectors including a larger ejector with a propellant gas flow of up to 10 liters per minute and with a suction flow of up to 60 liters per minute, said larger ejector having a second propellant gas connection for feeding the first gas component from said propellant gas container, a second suction channel for feeding the second gas component from said mixing chamber and a second gas outlet leading to said respiration connection; a central suction channel for feeding the second gas component to said mixing chamber; a first proportional valve regulating a gas feed of a propellant gas connection to said propellant gas container; a second proportional valve regulating a gas feed of another propellant gas connection to said propellant gas container; a first volume flow sensor arranged in said central suction channel; a second volume flow sensor arranged directly before said respiration connection; and an evaluating and control unit actuating said first proportional valve for opening in the case of a signal of up to about 20 liters per minute to be measured by the second volume flow sensor and actuating said second proportional valve for opening in the case of a signal to be measured between about 20 liters per minute and about 45 liters per minute, and actuating both said first proportional valve and said second proportional valve for opening in the case of a signal to be measured above about 45 liters per minute.