Apparatus for measuring hemoglobin
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Mar 29, 1996
filing date -
Mar 31, 1995
priority date (Note) -
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Abstract
Light of various wavelengths emitted from light sources and transmitted through vital tissues is converted by light sensors and current/voltage transducers, into electric signals. The signals are converted into digital values by an A/D converter. The light source emits light of a wavelength which can be optically absorbed by water. A computer obtains a ratio of variations of the digital values for each wavelength, and calculates the values of tissue terms and the hemoglobin concentration on the basis of the ratios. In the calculation, since tissue terms of the wavelengths have mutual constant relationships, an equation which is prepared so that there exists only one unknown in the tissue terms is used.
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