dinsdag 29 januari 2008

Looking into the Brain with Light

An Israeli company is working on a new device to monitor oxygen levels in the brain.
A new noninvasive diagnostic technology could give doctors the single most important sign of brain health: oxygen saturation. Made by an Israeli company called OrNim and slated for trials on patients in U.S. hospitals later this year, the technology, called targeted oximetry, could do what standard pulse oximeters can't.
A standard pulse oximeter is clipped onto a finger or an earlobe to measure oxygen levels under the skin. It works by transmitting a beam of light through blood vessels in order to measure the absorption of light by oxygenated and deoxygenated hemoglobin. The information allows physicians to know immediately if oxygen levels in the patient's blood are rising or falling.

Prior to the development of pulse oximeters, the only way to measure oxygen saturation was to take a blood sample from an artery and analyze it in a lab. By providing an immediate, noninvasive measure of oxygenation, pulse oximeters revolutionized anesthesia and other medical procedures.

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