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Pulse Oximetry  Favorite




Pulse oximetry is a simple, non-invasive method of monitoring the percentage of hemoglobin in the blood that is saturated with oxygen. This is done using a pulse oximeter, which indirectly measures the oxygen saturation of a patient's blood and changes in blood volume in the skin. The saturation level and heart rate are displayed on an LCD display. Pulse oximeters are either sold as stand-alone portable units or are connected to a larger patient monitoring system. Portable, battery-operated pulse oximeters are also available for home monitoring. Freescale offers ultra-low-power MCUs with the ability to drive an LCD display that are ideal for portable pulse oximeters.

Two key components comprise a pulse oximeter: a low-power MCU for battery applications and an optical sensor. The optical sensor is composed of two LEDs that transmit light through the skin (finger or earlobe) to a photodiode. One LED is red with a wavelength of 660 nm and the other is infrared with a wavelength of 910 nm.

Read more about pulse oximetry (pdf)

Freescale Pulse Oximetry block diagram

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