PULSE OXIMETER Russian patent published in 2001 - IPC

FIELD: medical equipment, applicable for noninvasive variation of saturation of arterialized blood with oxygen in the conditions of continuous monitoring. SUBSTANCE: the pulse dosimeter has a source of radiation in the red radiation bend, connected to the first current source, source of radiation in the infra-red radiation band, connected to the second current source, photodetector made in the form of a photodiode, and an electric signal converter, connected to the photodetector, DC voltage amplifier, whose input is connected to the output of the electric signal converter made in the form of a voltage-to-voltage converter, series-connected first synchronous detector, whose first input is connected to the output of the DC voltage amplifier, the first high-pass filter and the first AC voltage amplifier, series-connected second synchronous detector, whose first input is connected to the output of the DC voltage amplifier, the second high-pass filter and the second AC voltage amplifier, as well as an antiphase pulse shaper at a frequency of 200 to 2000 Hz, whose first output is connected to the control input of the first synchronous detector, and the second output - to the control input of the second synchronous detector, and connected with its output to the indicator, and with its first and second inputs - to the outputs of the first and second AC voltage amplifiers, respectively, of the function computation unit. In addition, use is made of a reference voltage driver with "Amplitude of currents", "Balance of currents" and "″α″" regulators, as well as an adjustable AC voltage source at a frequency of 1 to 2 Hz and a switch with the respective couplings. EFFECT: provision of check-up of pulse oximeter in the process of manufacture and service. 2 cl, 7 dwg