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

Claim 7:
8. A system for calculating a physiological parameter, comprising:
a sensor comprising at least one light emitting tube and at least one receiving tube, the at least one light emitting tube emitting at least two optical signals of red and infrared light for transmitting through a physiological tissue, and the at least one receiving tube receiving the at least two optical signals transmitted through the physiological tissue and converting the at least two optical signals received into electrical signals;
an analog to digital converter connected to the sensor to convert the electrical signals into a time domain signal, the time domain signal including at least some characteristics of the physiological tissue; and
a digital processor connected to the analog to digital converter, the digital processor performing the following processes:
performing a time-to-frequency domain transformation on a section of the time domain signal to obtain a corresponding frequency domain signal;
selecting all rational frequency spectrum peaks from the frequency domain signal, calculating position information of the selected rational frequency spectrum peaks, and forming a frequency spectrum peak position sequence;
constructing a time-varying array map according to the frequency spectrum peak position sequence, and constructing at least one stability factor for each position point that varies over time to form a stability factor array map;
constructing a stability coefficient based on the stability factor array map, and if the stability coefficient is relatively low, calculating a compensation coefficient by using the stability factor array map, wherein at least one frequency spectrum peak with a highest weight is selected from the stability factors and is combined with at least one of frequency characteristics and frequency spectrum peak morphological features to calculate the compensation coefficient; and
compensating 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.