| 摘要 |
An anaesthetic vaporiser comprises (a) a unit for supplying carrier gas with a composition selected according to the requirements of a patient to whom it is to be supplied from the vaporiser; (b) a regulator by which the quantity of the carrier gas flowing from the supply unit into a first passageway is controlled so that no more than a predetermined quantity of gas flows through that passageway; (c) a reservoir for an anaesthetic agent, from which the agent is supplied into the said first passageway to mix with the carrier gas flowing therein, for subsequent administration to a patient; and (d) a second passageway for the carrier gas, which extends from the regulator to a point at which the first and second passageways join to allow the anaesthetic agent and carrier gas in the first passageway to mix with carrier gas in the second passageway prior to administration of the agent to a patient. The vaporiser may include (e) a first sub-passageway which is connected to the second passageway so that the carrier gas in the first and second passageways, together with any anaesthetic agent in the first passageway, can mix prior to administration to a patient, (f) a second sub-passageway by which that gas can be administered directly to a patient without prior mixing with carrier gas in the second passageway, and (g) means for selecting flow of carrier gas in the first passageway, and any anaesthetic agent carried with it, between the first and second sub-passageways. |
