PPG Sensor Electrodes for Motion Artifact-Resistant Pulse Detection
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Solution Overview
Problem
Conventional photoelectric volume pulse wave sensors face challenges in accurately detecting pulse waves due to body motion, requiring separate components for motion detection, which increases cost and reduces accuracy.
Innovation Solution
The sensor integrates at least one electrode from the light-emitting or light-receiving element to detect body motion, using a light transmissive elastic dielectric layer for improved contact and a method to optimize pulse wave and body motion data, with a perfusion index threshold for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate body motion sensor is provided alongside the PPG sensor, then body motion detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the PPG sensor electrodes serve dual functions: both light emission/reception for pulse wave detection and body motion detection through capacitance measurement. The same electrode structure is used for both PPG signal acquisition and motion detection, eliminating the need for separate motion sensors and reducing device complexity while maintaining detection capabilities
Solution Approach 2:
The patent combines the PPG sensor and body motion sensor into a single integrated unit where the electrodes constituting the light-emitting element or light-receiving element are also used as electrodes that detect body motion. This merging of functions reduces the number of components and aligns detection positions for improved accuracy
2Adaptability or versatility
If separate PPG sensor and body motion sensor are used, then detection functions are complete, but detection accuracy decreases due to position misalignment
Solution Approach 1:
The patent merges the PPG sensor and body motion sensor into a single integrated unit with coincident detection positions. The electrodes serving both PPG and motion detection functions are positioned at the same location on the skin, ensuring that motion artifacts are accurately captured and can be effectively removed from the pulse wave signal, thereby improving detection accuracy
3Measurement precision
If multiple separate sensors are used for pulse wave and motion detection, then detection coverage is improved, but cost increases
Solution Approach 1:
The patent implements multi-functionality in the PPG sensor electrodes, enabling them to perform both light-based pulse wave detection and capacitance-based body motion detection. This eliminates the need for separate motion sensor components, reducing material costs, assembly complexity, and manufacturing expenses while maintaining comprehensive detection capabilities
Solution Approach 2:
By combining PPG sensor and body motion sensor functions into a single integrated component structure, the patent reduces the total number of parts that need to be manufactured, sourced, and assembled. This merging approach lowers manufacturing costs while preserving the ability to detect both pulse waves and body motion accurately
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
This approach reduces the number of components, lowers costs, and enhances the accuracy of pulse wave and body motion detection by aligning detection positions and optimizing data processing.
Implementation Method 1
a sensor that includes a light-emitting element and a light-receiving element, causes a photoelectric effect by irradiating the light-receiving element with light from the light-emitting element, and converts the light into electricity
Implementation Method 2
Any of an acceleration sensor, a capacitance sensor, and an optical sensor is used as the sensor that detects body motion
Data Source
AI summary
A photoelectric volume pulse wave sensor includes a light-emitting element and a light-receiving element. Electrodes constituting the light-emitting element or the light-receiving element are surface electrodes. At least one electrode among the electrodes is also used as an electrode that detects body motion.