Patent ID: 8448638

Claim:
An anesthetic vaporizer, comprising: a fresh gas inlet; a mixed gas outlet; a first gas branch circuit; a second gas branch circuit and a vaporizing chamber, the vaporizing chamber having a reservoir for containing an anesthetic agent, the first gas branch circuit connecting the fresh gas inlet and the mixed gas outlet, and the second gas branch circuit comprising a first pneumatic circuit, a pressure compensation unit; a second pneumatic circuit; and a wick unit and a third pneumatic circuit; the pressure compensation unit having a curved, continuous, and sealed vent slot, the wick unit having an immersion portion which directly contacts the anesthetic agent in the reservoir, the fresh gas inlet, the first pneumatic circuit, the sealed vent slot, the second pneumatic circuit, the wick unit, the third pneumatic circuit, and the mixed gas outlet being sequentially connected with one another, characterized in that the pressure compensation unit is provided in or near the reservoir and has a heat conductor which is to contact the anesthetic agent to transfer heat, and the sealed vent slot is formed in the heat conductor.