Anesthesia Machine Product,

an apparatus for administering inhalation anesthetic gases and vapors and for controlling ventilation. Although there are many different models, all have the following features: a delivery system for medical gases, a flowmeter to measure gas flow, vaporizers for volatilizing and combining the anesthetic agents with oxygen and carrier gases, a circuit for delivering the gas to the patient, monitoring equipment or gauges, a ventilator, and a scavenging system to collect and discharge excess gas.
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Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier