System for measuring the saturation of at least one gas, particularly the oxygen saturation of blood
First Claim
1. A system for measuring a saturation of at least one gas in blood present in a living body, comprising:
- light radiating means for generating light having various wavelengths;
a sensor intended to rest on the body, the sensor having a light radiating zone where the light having various wavelengths is emitted from the sensor into the body, and light receiving zones located at various distances from the light radiating zone;
light receiving means for detecting the intensity of light which is scattered back by the body and which reaches each light receiving zone; and
circuit means, connected to the light receiving means, for detecting the at least one gas saturation from light intensities detected for the various wavelengths, the circuit means including selection and evaluation means for selecting one evaluation zone among the light receiving zones on the basis of a predetermined criterion, and for evaluating light reaching the light receiving means only in the selected evaluation zone in order to detect the at least one gas saturation.
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Accused Products
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.
363 Citations
20 Claims
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1. A system for measuring a saturation of at least one gas in blood present in a living body, comprising:
- light radiating means for generating light having various wavelengths;
a sensor intended to rest on the body, the sensor having a light radiating zone where the light having various wavelengths is emitted from the sensor into the body, and light receiving zones located at various distances from the light radiating zone;
light receiving means for detecting the intensity of light which is scattered back by the body and which reaches each light receiving zone; and
circuit means, connected to the light receiving means, for detecting the at least one gas saturation from light intensities detected for the various wavelengths, the circuit means including selection and evaluation means for selecting one evaluation zone among the light receiving zones on the basis of a predetermined criterion, and for evaluating light reaching the light receiving means only in the selected evaluation zone in order to detect the at least one gas saturation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- light radiating means for generating light having various wavelengths;
Specification