Pulse-oximetry technology was available in 1930’s it became easily available only in the 1980’s with advances in the Light Emitting Diode (LED), microprocessors, optical plethysmography and spectro-photometry. Today pulse-oximetry provides a simple, non-invasive, portable and inexpensive method to continuously monitor oxygen saturation and heart rate with good accuracy.
A pulse oximeter is a particularly convenient noninvasive and measurement instrument. It has a pair of small light-emitting diodes (LEDs) facing a photodiode through a translucent part of the patient’s body, usually a fingertip or an earlobe. One LED is red, with wavelength of 660 nm, and the other is infrared, 905, 910, or 940 nm. Absorption at these wavelengths differs significantly between oxyhemoglobin and its deoxygenated form, therefore from the ratio of the absorption of the red and infrared light the oxy /deoxyhemoglobin ratio can be calculated. The absorbance of oxyhemoglobin and deoxyhemoglobin is the same (isosbestic point) for the wavelengths of 590 and 805 nm; earlier oximeters used these wavelengths for correction for hemoglobin concentration.
Pulse oximetry is a non-invasive and continuous method of determining the amount of oxygenated and deoxygenated hemoglobin in a person’s blood supply.
A pulse oximeter is a particularly convenient noninvasive and measurement instrument. It has a pair of small light-emitting diodes (LEDs) facing a photodiode through a translucent part of the patient’s body, usually a fingertip or an earlobe. One LED is red, with wavelength of 660 nm, and the other is infrared, 905, 910, or 940 nm. Absorption at these wavelengths differs significantly between oxyhemoglobin and its deoxygenated form, therefore from the ratio of the absorption of the red and infrared light the oxy /deoxyhemoglobin ratio can be calculated. The absorbance of oxyhemoglobin and deoxyhemoglobin is the same (isosbestic point) for the wavelengths of 590 and 805 nm; earlier oximeters used these wavelengths for correction for hemoglobin concentration.
Uses of pulse oximetry-
– This helps clinician in
– Noninvasive arterial oxygen saturation monitoring.
– Pulse rate monitoring.
– Trending of saturation and pulse rate
Electronic Engineering Services [http://www.engineeringservices.beganto.com/]
Over the past 50 years, Nichia has demonstrated its commitment to improving the overall performance…
To fund the acquisition and ongoing operation of the production facility, BluGlass has secured A$3.4…
New CAS 140D IR spectroradiometer with improved optical and electronic components offer the user higher…
SSC boasts world's only LED and LD technology for vehicles using all wavelengths of light…
E-cars do not have a classic radiator grille, so the front of the vehicle…
“We welcome the further alignment of ANSI C137.4-2021 and D4i, which is expected to lead…