System for measuring the saturation of at least one gas, particularly the oxygen saturation of blood
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United States of America Patent
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Apr 5, 1994
Grant Date -
N/A
app pub date -
Aug 12, 1992
filing date -
Aug 12, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A system for measuring the saturation of at least one gas in blood has a sensor which is, intended to be placed on a living body. Light is emitted from the sensor and into the body at a light radiating zone. The sensor has a plurality of light receiving zones, serving to receive light backscattered in the body, which zones are at various distances from the light radiating zone. Light receiving means are also present, in order to measure the intensities of the light backscattered from the body and reaching the sensor in the various light receiving zones. The measuring system also has electronic circuitry, which upon measurement, based on a predetermined criterion, selects one evaluation zone from among the light receiving zones and evaluate the portion of the light detected in the evaluation range that varies periodically over time at the rate of the pulse frequency in order to detect at least one gas saturation of blood, in particular the oxygen saturation of blood.
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