PULSE OXIMETER Russian patent published in 2022 - IPC A61B5/1455 

FIELD: medical equipment.

SUBSTANCE: invention relates to medical equipment, namely, to a pulse oximeter. Oximeter comprises an autonomous power source, red and infrared band emission sources; connected in series, a dual-color light filter, a photodetector, a current-to-voltage converter, a sampling and storage apparatus, a subtracting apparatus, a voltage amplifier, a low-pass filter, a control and processing unit based on an ADC microcontroller, and a gyro accelerometer. The emission sources are connected to the emission source illumination pulse generator in the red and infrared bands, respectively. The first and second control and processing units are connected to the input of the emission source illumination pulse generator in the red and infrared bands, respectively. The third output of the control and processing unit is connected to the first input of the sampling and storage apparatus. The multi-bit output of the control and processing unit is connected to the indication unit. The output of the current-to-voltage converter is connected to the second input of the subtracting apparatus. The red and infrared band emission sources and the photodetector are structurally combined and are made in the form of a clip sensor configured to be clasped on the finger or ear of the patient. The gyro accelerometer for recording the movement of the hand with the pulse oximeter is placed on the body of the pulse oximeter. The output of the gyro accelerometer is connected to the second input of the control and processing unit. Herewith, when the hand deviates from the steady state, a warning signal informing of potential inaccuracy of the results is issued. Said warning signal is stopped after the correct readings of the pulse oximeter are restored, namely, 15 seconds after the hand movement stops.

EFFECT: increase in the accuracy of measuring the saturation coefficient due to the elimination of false triggering and measurement errors caused by the movement of the part of the body whereon the pulse oximeter is located, due to the prompt information thereof.

1 cl, 6 dwg