METHOD FOR NON-INVASIVE MEASUREMENT OF BLOOD SATURATION WITH OXYGEN Russian patent published in 2001 - IPC

FIELD: medicine. SUBSTANCE: the method is based on determination of the reflection factor of optical radiation and consists in irradiation of skin and biotissue sections by monochromatic radiations with wavelengths λ₁= 630±30 nv; ; λ₂= 830±80 nv, and two- channel photographic recording of dissipated signal. After photographic recording in the first channel selection of the Doppler signal in band f₁= 2nv_r/λ₁, and in the second channel in band f₂= 2nv_r/λ₂, is accomplished, where v_r-speed of erythrocyte motion in the examined section of the microcirculation system, and n-optical index of medium refraction. Then amplitude detection, separation of the alternating (pulse and respiratory) and direct signal components in each channel, normalization of the alternating signal component to the direct one are performed for each channel. In accordance with the invention, separated from the signal of the second channel is the part that is cophased with the signal of the first channel, and the relation between the signal of the first channel and the separated part of the first channel and the separated part of the signal of the second channel is calculated. EFFECT: enhanced accuracy of measurement of tissue oxygenation, expanded field of application of this method. 3 tbl, 1 ex