Method and apparatus for detecting fetal blood oxygen saturation, computer-readable storage medium and computer device

A method for detecting fetal blood oxygen saturation, comprising:

• using at least two detection light of different wavelengths to irradiate a fetus in an examined pregnant woman's abdomen in a time-sharing manner and acquiring first photoplethysmography signals corresponding to the abdomen under irradiation of the respective wavelengths of detection light, and to irradiate a detection site except for the examined pregnant women's abdomen in a time-sharing manner and acquire second photoplethsymography signals to corresponding to the detection site under irradiation of the respective wavelengths of the detection light;
• determining a target photoplethysmography signal of the fetus that corresponds to detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to the detection light each wavelength, and
• determining the fetal blood oxygen saturation, according to respective target photoplethysmography signals determined,
• wherein the determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to the detection light of each wavelength, comprises:
• determining a target frequency domain signal of the fetus that corresponds to the detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to each wavelength of the detection light;
• determining a corresponding fetal heart rate according to a present rule;
• and
• determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the corresponding fetal heart rate determined and respective target frequency domain signals,
• wherein the determining the corresponding fetal heart rate according to the preset rule comprises:
• selecting one wavelength of detection light in all wavelengths of the detection light, and determining the examined pregnant woman's heart rate according to second photoplethysmography signals corresponding to the selected one wavelength of detection light;
• and
• determining the corresponding fetal heart rate, according to the examined pregnant woman's heart rate and a pre-stored correspondence table between pregnant women's heart rates and fetal heart rates.

An apparatus for detecting fetal blood oxygen saturation, comprising:

• a first detecting portion, a second detecting portion, and a signal processing portion;
• the first detecting portion comprising:
• at least two first light sources and a first photoelectric volume detector, wherein each of the first light sources is configured to emit detection light of one wavelength, wavelengths of detection light emitted by respective first light sources are different from each other, and the first photoelectric volume detector is configured to receive light of the detection light that is reflected by a fetus;
• the second detecting portion comprising:
• at least two of the first light sources and a second photoelectric volume detector, wherein the second photoelectric volume detector is configured to receive light of the detection light that is transmitted through a detection site except for an examined pregnant woman's abdomen;
• the signal processing portion comprising:
• a first signal processor, a second signal processor, a third signal processor, and a blood oxygen saturation determining unit, wherein
• the first signal processor is configured to control the respective first light sources in the first detecting portion to emit detection light in a time-sharing manner, to irradiate the fetus in the examined pregnant woman's abdomen, and acquire first photoplethysmography signals corresponding to the abdomen under irradiation of the respective wavelength of detection light, according to light of the respective wavelength of detection light that is reflected by the fetus and received by the first photoelectric volume detector;
• the second signal processor is configured to control the respective first light sources in the second detecting portion to emit detection light in a time-sharing manner, to irradiate the detection site;
• and acquire second photoplethysmography signals corresponding to the detection site under irradiation of the respective wavelength of detection light, according to light of the detection light that is transmitted through detection sites except the detection site and received by the second photoelectric volume detector;
• the third signal processor is configured to determine a target photoplethysmography signal of the fetus that corresponds to detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to the detection light of each wavelength;
• and
• the blood oxygen saturation determining unit is configured to determine the fetal blood oxygen saturation, according to respective target photoplethysmography signals determined,
• wherein in a case of determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to the detection light of each wavelength, the third signal processor is configured for:
• determining a target frequency domain signal of the fetus that corresponds to the detection light of each wavelength, according to the first photoplethysmography signals that correspond to the detection light of each wavelength, according to the first photoplethysmography signals and the second photoplethysmography signals that correspond to each wavelength of the detection light;
• determining a corresponding fetal heart rate according to a present rule;
• and
• determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the corresponding fetal heart rate determined and respective target frequency domain signals,
• wherein in a case of determining the corresponding fetal heart rate according to the present rule, the third signal processor is configured for;
• determining a fetal heart rate corresponding to each wavelength of the detection light, according to the target frequency domain signal of the fetus that corresponds to each wavelength of the detection light,
• wherein in a case of determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the corresponding fetal heart rate determined and the respective target frequency domain signals, the third signal processor is configured for:
• determining the target photoplethysmography signal of the fetus that corresponds to the detection light of each wavelength, according to the fetal heart rate and the target frequency domain signal corresponding to the detection light of each wavelength, and
• wherein in a case of determining the fetal heart rate corresponding to each wavelength of the detection light, according to the target frequency domain signal of the fetus that corresponds to each wavelength of the detection light, the third signal processor is configured for:
• determining the fetal heart rate corresponding to the detection light of each wavelength, according to the signal obtained after sequentially performing frequency-time conversion processing, autocorrelation processing and time-frequency conversion processing on the target frequency domain signal corresponding to the detection light of each wavelength.