Lec._Pulse_Oximeter.pptx;filename_= UTF-8''Lec.%20Pulse%20Oximeter.pptx - Pulse Oximeters Alazhar University Medical Devices(1 Eng Qasem Alyazji

Lec._Pulse_Oximeter.pptx;filename_= UTF-8''Lec.%20Pulse%20Oximeter.pptx

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Pulse Oximeters Alazhar University Medical Devices (1) Eng. Qasem Alyazji
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Definitions Pulse oximeter measure how much of the hemoglobin in blood is carrying oxygen (oxygen saturation SPO2). Pulse oximeter measure oxygen saturation. uses a light sensor containing two sources of light (red and infrared ) that are absorbed by hemoglobin and transmitted through tissues to a photodetector.
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Before we learn the principles of how pulse oximeter work, we need to have an understanding of what oxygen saturation is.
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What is oxygen saturation ? Red blood cells contain haemoglobin which carries oxygen. When haemoglobin is carrying oxygen it is described as “ saturated with oxygen The color of blood depends on how much haemoglobin is saturated with oxygen . Arterial blood is fully saturated and is bright red; venous blood has less oxygen and is dark red.
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The hemoglobin without oxygen we will call de oxygenated hemoglobin (deoxy Hb).
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