Patent ID: 11872060
Assignee: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 15:
16. A method for calculating a physiological parameter, comprising:
emitting, via at least one light-emitting tube of a sensor, at least two optical signals of different wavelengths for transmitting through a physiological tissue;
receiving, via at least one receiving tube of the sensor, the at least two optical signals transmitted through the physiological tissue and converting the at least two optical signals received into electrical signals;
converting, via an analog to digital converter connected to the sensor, the electrical signals into a time domain signal, the time domain signal including at least some characteristics of the physiological tissue;
performing, via a digital processor connected to the analog to digital converter, a time-to-frequency domain transformation on a section of the time domain signal to obtain a frequency domain signal;
selecting, via the digital processor, all rational frequency spectrum peaks from the frequency domain signal, calculating energy and position information of the selected rational frequency spectrum peaks, and forming a frequency spectrum peak energy ratio sequence and a frequency spectrum peak position sequence;
constructing, via the digital processor, a stability coefficient according to the frequency spectrum peak energy ratio sequence and the frequency spectrum peak position sequence, and if the stability coefficient is relatively low, constructing a compensation coefficient by using the frequency spectrum peak energy ratio sequence and the frequency spectrum peak position sequence; and
compensating, via the digital processor, for at least one of the time domain signal and the frequency domain signal by using the compensation coefficient, and calculating the physiological parameter based on at least one of the compensated time domain signal and frequency domain signal.