| 摘要 |
A vaporizer for vaporizing a liquid anaesthetic has an inlet for a carrier gas, an outlet for the carrier gas and vaporized anaesthetic, a flow channel connecting the inlet to the outlet, a chamber for liquid anaesthetic, a first connection between the flow channel and the chamber, a second connection between the flow channel and the chamber downstream from the first connection and a throttle in the flow channel between the first connection and the second connection. The second connection has a conduit, one end of which is immersed in the liquid anaesthetic, and a valve connected to the other end of the conduit so as to increase safety, prevent leakage and erroneous dispensing and allow the use of liquid anaesthetics with a low boiling point. The valve is devised to open when there is a predetermined drop in pressure across the throttle, allowing liquid anaesthetic to be dispensed into the flow channel.
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