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Modules designed to be used as a component of a physiologic monitor, along with related devices, to acquire, analyze, and process information for the purposes of continuously and, in some cases, simultaneously monitoring the concentrations of anesthetic gases such as nitrous oxide, halothane, enflurane, sevoflurane, desflurane, and isoflurane via the patient airway; some modules can also process information on the inspired and expired concentrations of several respiratory (e.g., oxygen, carbon dioxide) gases and related physiologic parameters. These modules contain electronic circuits or other technology designed to acquire/process the signal from a set of sensors (e.g., infrared light spectrometry probes) and transmit it to the physiologic monitor, which contains the software designed to support the module\'s intended function(s). Anesthetic gas monitoring modules must be inserted in a dedicated location (e.g., \'slot\') within a physiologic monitor (e.g., modular or modular/configured monitor) or related device (e.g., module rack) in order to support the desired function(s). These modules can also be used with dedicated anesthesia units. Typical functions of an anesthetic gas monitor module, when used with a physiologic monitor or anesthesia unit, include display of waveforms and numeric/trends for anesthetic gas concentrations (and in some cases, related physiologic parameters) and appropriate initiation of visual/audible alarms.
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