Pulse Oximeters are the medical devices that enable pulse oximetry
Pulse oximetry is a non-invasive method for monitoring a person’s oxygen saturation.
In its most common (transmissive) application mode, a sensor device is placed on a thin part of the patient’s body, usually a fingertip or earlobe, or in the case of an infant, across a foot. The device passes two wavelengths of light through the body part to a photodetector. It measures the changing absorbance at each of the wavelengths, allowing it to determine the absorbances due to the pulsing arterial blood alone, excluding venous blood, skin, bone, muscle, fat, and (in most cases) nail polish.
The most common form of pulse oximeter is the fingertip version. It is available in Paediatric or Adult form
There is also a hand-held version which is useful in areas where the patient may be restless as it limits the amount of potential movement of the sensor
Finally there is a less common desktop model which is useful in the dental surgery for instance
There is also sometimes the option of various sensors on the high end devices ranging from neonate to adult and disposable to rubber reusable
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