Fetal Blood Oxygen Saturation Detection via Photoplethysmography Signal Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting fetal blood oxygen saturation are invasive or rely on indirect monitoring, leading to inaccurate results.
Innovation Solution
A method and apparatus using at least two detection lights of different wavelengths to irradiate a fetus and a detection site, acquiring photoplethysmography signals to determine fetal heart rate and oxygen saturation, while isolating fetal signals from maternal heart rate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fetal heart rate monitor is used for monitoring fetal physiological state, then monitoring can be performed non-invasively, but measurement precision of fetal blood oxygen saturation deteriorates
Solution Approach 1:
The patent segments the detected signal into maternal and fetal components by analyzing different frequency bands. The maternal heart rate signal and fetal heart rate signal are separated through frequency domain analysis, allowing independent extraction of fetal blood oxygen saturation data from the composite abdominal signal.
Solution Approach 2:
The patent uses photoplethysmography technology as an intermediary method between invasive measurement and indirect fetal heart rate monitoring. By detecting light absorption changes in the abdominal region and processing the signal through frequency analysis, it obtains direct fetal blood oxygen saturation data without invasive procedures.
2Ease of operation
If indirect monitoring method is used through fetal heart rate monitor, then operation simplicity is maintained, but measurement precision of fetal blood oxygen saturation deteriorates
Solution Approach 1:
The patent replaces the mechanical/indirect monitoring approach with an optical detection system. By using light sources and photodetectors to measure blood oxygen saturation directly through the abdomen, it substitutes the indirect electrical signal monitoring with direct optical measurement, thereby improving accuracy while maintaining non-invasive operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the accuracy of fetal blood oxygen saturation detection by non-invasively obtaining both maternal and fetal heart rate information, allowing for precise calculation of fetal oxygen saturation.
Implementation Method 1
acquiring first photoplethysmography signals corresponding to the abdomen under irradiation of the respective wavelengths of detection light, and to irradiate a detection site except the examined pregnant woman's abdomen in a time-sharing manner and acquiring second photoplethysmography signals
Data Source
AI summary
A method for detecting fetal blood oxygen saturation, including: 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 the examined pregnant woman's abdomen in a time-sharing manner and acquiring second photoplethysmography signals 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 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; and determining the fetal blood oxygen saturation, according to respective target photoplethysmography signals determined.