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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 percent of oxygen saturation of hemoglobin in arterial blood; oxygen saturation values indicate whether the patient\'s blood is carrying sufficient oxygen. These modules contain electronic circuits or other technology designed to acquire and/or process a signal from one or more physiologic sensors (e.g., probes) and transmit it to the physiologic monitor, which contains the software designed to support the module\'s intended function(s). Pulse oximetry probes typically have red and infrared light sources that transmit light through a pulsating arterial bed (e.g., in the patient\'s fingertip or earlobe), along with photodetectors that receive the light that passes through the arterial bed. Oxygenated hemoglobin (O2Hb) and deoxygenated hemoglobin (HHb) in the blood absorb the two wavelengths of light differently. Based on the relative absorption of the wavelengths, the pulse oximetry module determines the relative amount of O2Hb and HHb in the blood and calculates and displays the SpO2 value. Pulse oximetry 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(s). Typical functions include display of numeric values/trends for SpO2, display of the plethysmogram waveform, and appropriate initiation of visual/audible alarms. Many modules also allow for monitoring and display of the patient\'s pulse rate (e.g., with a numeric value in beats per minute).
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