Smart Glove PPG Sensor with Skin Pigmentation Correction
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Solution Overview
Problem
Current pulse oximeter technologies demonstrate racial bias, leading to inaccurate SpO2 measurements for African American, Asian, and Hispanic patients compared to Caucasian patients, which results in disparities in healthcare outcomes and increased mortality rates among minority patients.
Innovation Solution
A wearable photoplethysmography system that includes a dual-sensor configuration on a smart glove, with sensors on the finger and wrist, and a processor that adjusts for skin pigmentation and thickness using advanced algorithms such as the inverse synchro squeezed wavelet transform (ISSWT) to provide accurate SpO2 and RR measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current pulse oximeter technology is used, then SpO2 measurements can be obtained, but measurement precision deteriorates for African American, Asian, and Hispanic patients due to racial bias
Solution Approach 1:
The system changes the measurement parameters by incorporating multiple wavelength lights (red and infrared) instead of single wavelength, and adds skin pigmentation detection as a separate measurement parameter. This allows the system to account for variations in skin tone while measuring SpO2, thereby improving measurement precision across diverse populations without compromising reliability.
Solution Approach 2:
The system introduces skin pigmentation detection as an intermediary measurement that mediates between the light absorption measurement and the final SpO2 calculation. By detecting skin pigmentation characteristics separately and using them to adjust the SpO2 calculation, the system eliminates the direct bias between skin tone and measurement accuracy, improving both precision and reliability.
2Measurement precision
If single-wavelength photoplethysmography is used, then device complexity is reduced, but measurement precision deteriorates due to inability to differentiate hemoglobin ratio changes from skin pigmentation variations
Solution Approach 1:
The system segments the photoplethysmography measurement into separate functional components: skin pigmentation detection using red light and SpO2 measurement using infrared light. This segmentation allows each component to be optimized independently, improving measurement precision while keeping the overall device complexity manageable through modular design.
Solution Approach 2:
The dual-wavelength sensor configuration provides multi-functionality by simultaneously enabling skin pigmentation detection and SpO2 measurement. This universal sensor design allows a single device to perform multiple functions that were previously separate, improving measurement precision without proportionally increasing device complexity.
3Measurement precision
If traditional pulse oximetry is used, then the system is simple, but it cannot differentiate changes in light absorption due to hemoglobin to oxyhemoglobin ratio from skin pigmentation variations
Solution Approach 1:
The system replaces the simple single-wavelength optical measurement with a multi-wavelength optical measurement system that incorporates computational algorithms. By substituting the mechanical simplicity of single-wavelength measurement with multi-wavelength optical measurement combined with image processing algorithms, the system achieves accurate differentiation between hemoglobin ratio changes and skin pigmentation variations.
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 system effectively mitigates racial biases in SpO2 monitoring, providing accurate and continuous readings for diverse populations, and integrates environmental sensors to monitor PM2.5 and PM10 levels, enhancing the management of respiratory conditions like COPD.
Implementation Method 1
Current pulse oximeter technology relies on the photoplethysmography technique
Data Source
AI summary
A Flex Force Smart Glove with Photoplethysmography provides a wearable health technology for patients with chronic respiratory diseases such as COPD to aid in continuous blood oxygen saturation (SpO2) and respiration rate (RR) monitoring addressing and correcting racial biases of conventional devices by intelligently accounting for variations in skin pigmentation and thickness. Equipped with environmental sensors to detect PM2.5 and PM10 particulate matter, health and environmental monitoring are merged to provide a comprehensive solution to both individual and collective health challenges.