초록 ▼

A method of mixing a plurality of gases in a specified proportion and dosing the resultant gas mixture comprises supplying individually controlled gas streams from suitable sources thereof in a pulse-like fashion to an enclosed chamber from where the resultant gas mixture can be delivered to a point

A method of mixing a plurality of gases in a specified proportion and dosing the resultant gas mixture comprises supplying individually controlled gas streams from suitable sources thereof in a pulse-like fashion to an enclosed chamber from where the resultant gas mixture can be delivered to a point of use, such as a patient undergoing anesthesiological or respirational treatment. Each gas source is connected, via feed lines each having a back-pressure valve and an on-off solenoid valve, via a common flow line to an enclosed mixing chamber. A first and, optionally, a second flow meter are operationally positioned between the common flow line and the enclosed mixing chamber and generate electrical signals in accordance with select properties of the gas streams passing through such flow meter. These signals are transmitted to a microprocessor-controlled regulating unit, which also controls the solenoid valves in accordance with a specified program to provide desired gas pulses to the enclosed mixing chamber. A display means, a memory means and an alarm means can be operationally connected with the regulating unit.

대표청구항 ▼

In a method of mixing a plurality of gases in a specified proportion and dosing the resultant gas mixture to a point of use whereby individual gases are transmitted via separate lines having controllable valve means successive in pulse-like fashion to a common line and the pulse gas quanitites of th

In a method of mixing a plurality of gases in a specified proportion and dosing the resultant gas mixture to a point of use whereby individual gases are transmitted via separate lines having controllable valve means successive in pulse-like fashion to a common line and the pulse gas quanitites of the various gases behave in relation to one another like the desired proportions between such gases in the mixture, wherein the improvement comprises: determining the flow of individual gas pulses in one and the same flow meter; controlling the gas quanitites of the individual gas pulses by regulating the length of such gas pulses in dependence on measured values obtained from said flow meter, said flow of individual gas pulses being determined by two flow meters which respond differently to specific properties of the gases and any deviation from a predetermined difference in such measurement results is displayed and/or utilized to initiate operative counter-measures.