Wearable Pulse Oximeter Calibration via Reference Device
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Solution Overview
Problem
Current pulse oximetry devices face challenges in accurately and consistently measuring blood oxygenation (SpO2) due to factors like respiratory activity, patient motion, skin elasticity, and temperature variations, which affect the reliability and repeatability of measurements, especially when used outside controlled environments.
Innovation Solution
A pulse oximetry device calibrated using reference SpO2 values from a medical-grade pulse oximeter, incorporating light emitters and detectors to measure light characteristics, with a calibration method that accounts for individual patient variations, allowing for accurate SpO2 measurement over extended periods, even in non-clinical settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pulse oximetry measurements are taken in non-controlled environments, then continuous monitoring in daily life activities is enabled, but measurement accuracy and consistency deteriorate due to respiratory activity, patient motion, skin elasticity, and temperature variations
Solution Approach 1:
The system performs preliminary calibration by collecting pulse oximetry measurements from multiple patients using both the wearable device and a reference medical-grade pulse oximeter. Calibration data is processed to establish correction relationships before actual use, enabling the device to compensate for environmental and patient-specific variations during continuous monitoring
Solution Approach 2:
The system continuously compares measurements from the wearable pulse oximetry device with reference measurements from a medical-grade pulse oximeter. The difference between measured and reference SpO2 values is calculated and used to update calibration parameters in real-time, improving measurement accuracy during continuous monitoring
2Measurement precision
If calibration data is collected from multiple patients, then individual patient variations are accounted for, but the complexity of the calibration process increases
Solution Approach 1:
The system creates a universal calibration model that works across multiple patients by collecting calibration data from a diverse group of patients during the calibration phase. This universal model captures common variations in skin elasticity, anatomy, and physiological characteristics, enabling accurate measurements without requiring individualized calibration for each patient
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
The device provides accurate and consistent SpO2 measurements over 24 hours, enhancing medical diagnosis by mitigating environmental and patient-related interference, and allowing for continuous monitoring in daily life activities.
Implementation Method 1
Certain pulse oximetry methods are based on non-invasive detection of light reflected, scattered or otherwise transmitted through a peripheral tissue perfused with blood
Implementation Method 2
These methods are generally collectively referred to as photoplethysmography. Accordingly, a photoplethysmographic signal (or, PPG signal) is collected by at least one PPG sensor, and then analysed
Data Source
AI summary
A method of measuring blood oxygenation consists of measuring Sp02 on one or more test subjects using a first, reference pulse oximetry device (100), such as a medical- grade pulse-oximeter of the kind that employs, for example, a finger-tip clip-type probe. This can be done on each patient over relatively short time periods. Then, the Sp02 is monitored on a target subject across a relatively longer time period using a second, wearable pulse oximetry device (10) that can be worn non-intrusively by the target use, for example in the form of a bracelet. The Sp02 measured using the wearable pulse oximetry device (10), can be measured based on calibration measurements performed using the first, reference pulse oximetry device (100). In this way, the measurements produced by the wearable pulse oximetry device (10) are calibrated using a medical-grade pulse- oximeter (100).