Patent ID: 8365724

Claim:
An anesthetic vaporizer, comprising: a carrier gas conduit configured to deliver a flow of carrier gas; an anesthetic source, comprising an anesthetic agent; a flow valve disposed between the anesthetic source and an anesthetic gas inlet in the carrier gas conduit, the flow valve operable to control a flow of the anesthetic agent into the carrier gas; a first sensor in communication with the carrier gas conduit upstream of the anesthetic gas inlet and the first sensor produces a first sensor signal indicative of a composition of the carrier gas upstream of the anesthetic gas inlet; a second sensor in communication with the carrier gas conduit downstream of the anesthetic gas inlet and the second sensor produces a second sensor signal indicative of a composition of the combined carrier gas and anesthetic agent; and a controller that receives the first sensor signal and the second sensor signal, the controller further connected to the flow valve and operates the flow valve in response to the received first sensor signal and second sensor signal.