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Modules designed to be used as a component of a physiologic monitor, along with related devices, to acquire, measure, and process information for the purpose of continuously, noninvasively monitoring the partial pressure (concentration) of carbon dioxide (tcpCO2) and/or oxygen (tcpO2) in the blood through skin-surface (i.e., transcutaneous) measurements. Skin-surface tcpCO2/tcpO2 measurements correlate with arterial partial pressure, providing a noninvasive means of continuously monitoring blood gas. These modules contain electronic circuits or other technology designed to acquire and/or process a signal from two separate sensors or a combined tcpCO2/tcpO2 sensor applied to the patient\'s skin and transmit the signal to the physiologic monitor, which contains software to support the module\'s intended function. Transcutaneous blood gas monitor modules must be inserted in a dedicated location (e.g., \'slot\') within a physiologic monitor (e.g., modular or modular/configured bedside or transport monitor) or related device (e.g., module rack) in order to support the desired function. Typical functions of a transcutaneous blood gas monitor module, when used with a physiologic monitor, include the display of waveforms and numeric/trends for tcpCO2 and/or tcpO2 and appropriate initiation of visual/audible alarms; some modules also support measurement and display of information related to the pH of the blood. Transcutaneous blood gas monitor modules are typically used in the neonatal intensive care unit.
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