Apparatus for determining concentrations of light-absorbing materials in living tissue
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Jul 19, 1999
filing date -
Jul 17, 1998
priority date (Note) -
Expired
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Abstract
Irradiating device 3 of a pulse oximeter includes a scattering plate 6. Scattering light is projected into a living tissue. The diameter of the incident area is sufficiently large compared with that of a light receiving area or vice versa. Therefore, tissue terms in a theoretical formula of .PHI. which represents a ratio of changes of optical densities of tissue measured with two wavelengths are not dependent on the wavelength. The digital processor 10 calculates an oxygen saturation by substituting .PHI. measured into simultaneous equations.
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