| 摘要 |
<p>An anesthesia apparatus which comprises at least two flow meters, an oxygen gas supply means for supplying oxygen gas to one of said flow meters, a nitrous oxide gas supply means for supplying nitrous oxide gas to another one of said flow meters, at least two flow rate adjustment valves disposed between the one of said flow meters and said oxygen gas supply means and between said another one of said flow meters and said nitrous oxide gas supply means, respectively, each of said flow rate adjustment valve including a valve element having a predetermined shape to vary the rate of flow of each of said gases substantially in proportion to the amount of movement of said valve element, a flow control means connected to said flow rate adjustment valves for actuating said valves, and a flow rate adjustment means operatively connected to said flow control means and operative to set a selected angular position of said flow control means with respect to said flow rate adjustment valves for thereby determining the relative proportions of said gases, said flow control means being operative to move said flow rate adjustment valves while maintaining said selected angular position for thereby varying the total rate of flow of said gases substantially without varying the relative proportions thereof.</p> |
