By John G Webster
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Chem. 56 62-7 Peura R A 1998 Chemical biosensors Medical Instrumentation: Aaulication and Desian 3rd edn. ed J G Webster (New York: Wiley) Polanyi M L and Hehir R M 1962 In vivo oximeter with fast dynamic response Rev. Sci. Instrum. 33 1050-4 (Reurinted 1990 Selected Pauers on O ~ t i ~ Fibers d in Medicine ed B Thompson (Bellingham'WA: S P E Optical Engineering Press)j Pologe J A 1987 Pulse oximetry: technical aspects of machine design Int. Anesthesiol. Clinics 2 5 (3) 137-53 Rebuck A S, Chapman K R and D'Urzo A 1983 The accuracy and response characteristics of a simplified ear oximeter Chest 83 860-4 Santamaria T and Williams J S 1994 Pulse oximetry Med.
When hemoglobin is fully saturated with oxygen (carrying four oxygen molecules), it is called oxyhemoglobin (Hb02). If it is not fully saturated with oxygen it is called reduced hemoglobin (Hb). Therefore oxyhemoglobin and reduced hemoglobin are functional hemoglobins. Most of the hemoglobins in a healthy individual are functional hemoglobins. The functional oxygen saturation (functional S02) is measured in percentage and determined by the amount of oxygenated hemoglobin (Hb02) as compared to the sum of oxygenated and reduced hemoglobin (Hb).
An additional LED at 810 nm was used in an attempt to determine the amount of COHb in the blood. Buinevicius also presented a method to calibrate the pulse oximeter for three wavelengths using three-dimensional solutions to Beer's law. 7 Comparison of pulse oximetry to transcutaneous PO2 electrodes Pulse oximeters and transcutaneous P O 2 electrodes are the two main technologies used to provide continuous information about the supply of oxygen to the body. 1 provides a comparison between the two technologies.
Design of pulse oximeters by John G Webster