13.07.2015 Views

Manual - EDAN USA

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H100B Pulse Oximeter User <strong>Manual</strong>The oximeter determines SpO 2 by passing red andinfrared light into an arteriolar bed and measuringchanges in light absorption during the pulsatile cycle.Red and infrared low-voltage light-emitting diodes (LED)serve as light sources; a photonic diode serves as thephoto detector.Because oxyhemoglobin and deoxyhemoglobin differ inlight absorption, the amount of red and infrared lightabsorbed by blood is related to hemoglobin oxygensaturation. To identify the 0oxygen saturation of arterialhemoglobin, the oximeter uses the pulsatile nature ofarterial flow.During systole, a new pulse of arterial blood enters thevascular bed, and blood volume and light absorptionincrease. During diastole, blood volume and lightabsorption reach their lowest point.The oximeter bases its SpO 2 measurements on thedifference between maximum and minimum absorption(measurements at systole and diastole). By doing so, itfocuses on light absorption by pulsatile arterial blood,eliminating the effects of non-pulsatile absorbs such astissue, bone and venous blood.- 68 -

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