Apparatus for determining the concentration of a light-absorbing material in blood
First Claim
1. An apparatus for determining the concentration of a light-absorbing material in blood based on a differential amount of transmission of light of different wavelengths passing through a living tissue due to blood pulsations, said apparatus comprising:
- a light intensity detector for detecting the intensity of said light passing through said tissue;
time point detecting means for detecting, for each wavelength of light, a plurality of points in time that fall in the vicinity of one peak and one trough of a detection signal produced by said light intensity detector;
memory means for storing, for each wavelength of light, values of said detection signals produced at each of said points in time as detected by said time point detecting means; and
concentration computing means for computing a concentration of a light-absorbing material in blood in said tissue in response to the values of said detection signals stored by said memory means.
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Accused Products
Abstract
An apparatus for determining the concentration of a light-absorbing material contained in blood flowing through a tissue which minimizes the amount of error caused by noise and which ensures highly precise results at all times. The apparatus operates according the principle that light beams of different wavelengths are absorbed by different amounts when passing through the tissue at different portions of the blood pulsation cycle. A plurality of points are detected that fall in the vicinity of the peak and trough of a cycle of a light detection signal. For each wavelength of light, the values of the detection signals produced at each of these points in time is stored. The concentration of the light-absorbing material is computed in response to the stored detection signals.
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Citations
3 Claims
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1. An apparatus for determining the concentration of a light-absorbing material in blood based on a differential amount of transmission of light of different wavelengths passing through a living tissue due to blood pulsations, said apparatus comprising:
- a light intensity detector for detecting the intensity of said light passing through said tissue;
time point detecting means for detecting, for each wavelength of light, a plurality of points in time that fall in the vicinity of one peak and one trough of a detection signal produced by said light intensity detector;
memory means for storing, for each wavelength of light, values of said detection signals produced at each of said points in time as detected by said time point detecting means; and
concentration computing means for computing a concentration of a light-absorbing material in blood in said tissue in response to the values of said detection signals stored by said memory means. - View Dependent Claims (2, 3)
- a light intensity detector for detecting the intensity of said light passing through said tissue;
Specification