ElectroniCast is currently conducting market research on the use of LEDs used in pulse oximeters
A pulse oximeter is a noninvasive medical device used for continuously measuring the percentage of hemoglobin (Hb) saturated with oxygen and the pulse rate of a patient.
Hemog-lobin that is carrying oxygen (oxyhemoglobin) absorbs light in the infrared (IR) region of the spectrum; hemoglobin that is not carrying oxygen (deoxyhemoglobin) absorbs visible red (R) light.
In pulse oximetry, a clip containing two LEDs (sometimes more, depending on the complexity of the measurement algorithm) and the light sensor (photodiode) is placed on the finger or earlobe of the patient.
One LED emits red light (approximate wavelengths of 600 nm to 700 nm), and the other emits light in the near IR (approximate wavelengths 800 nm to 900 nm) region.
A cable to a processor unit connects to the clip of the pulse oximeter. The LEDs are rapidly and sequentially excited by two current sources (one for each LED) whose dc levels depend on the LED being driven, based on manufacturer requirements. The detector is synchronized to capture the light from each LED as it is transmitted through the tissue.
Note: The LEDs used for the displays in the devices is not included.
ElectroniCast has completed company profiles on 47-manufacturers of pulse oximeters.
ElectroniCast Contact: stephen_montgomery@electronicastconsultants.com
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