| 摘要 |
<p>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.</p> |
