Adaptive Pulse Oximetry Wavelength Control for Motion Noise
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Solution Overview
Problem
Conventional optical measurement devices for vital parameters in the external auditory canal suffer from signal interference due to movement and environmental conditions, leading to fluctuating signal quality and unreliable measurements.
Innovation Solution
A system with multiple light transmitters of differing wavelengths, controlled by a controller that adapts to context information such as movement and environmental conditions, ensuring optimal signal quality by selecting appropriate wavelengths for improved measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical sensors are used in the external auditory canal, then vital parameters can be measured non-invasively, but signal quality fluctuates due to movement and environmental conditions
Solution Approach 1:
The patent applies dynamics by making the light source wavelength selectable and adaptable. The system can dynamically switch between different wavelengths (e.g., green LED for motion detection, infrared LED for oxygen saturation) based on real-time conditions such as movement detection and environmental lighting, thereby maintaining reliable signal quality across varying operational contexts
Solution Approach 2:
The patent changes the physical parameter of light wavelength to optimize measurement reliability. By selecting different wavelengths from multiple LEDs and adjusting their intensity, the system adapts to different measurement requirements and environmental conditions, resolving the contradiction between reliable measurement and adaptability to changing conditions
2Measurement precision
If multiple light transmitters with different wavelengths are used, then measurement accuracy under various conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by using a single integrated sensor unit that can perform multiple measurement functions (oxygen saturation, pulse rate, motion detection, temperature) by selectively activating different wavelength LEDs. This universal approach allows one device to replace multiple specialized devices, improving measurement accuracy without proportionally increasing device complexity
Solution Approach 2:
The patent merges multiple light sources and measurement functions into a single integrated unit. By combining green LED, infrared LED, and other wavelength sources in one device with a unified signal processing system, the patent achieves high measurement precision across various parameters while managing device complexity through integration rather than separate components
3Reliability
If light intensity is increased to improve signal detection, then signal strength is improved, but heat generation and interference increase
Solution Approach 1:
The patent applies local quality by using wavelength-selective detection. Different wavelengths are optimized for different tissue depths and measurement types, allowing the system to concentrate optical energy where needed without generating excessive heat. The sensor can selectively detect specific wavelength ranges, improving signal detection reliability while minimizing harmful effects from unnecessary light intensity
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
Enables reliable, continuous, and discrete measurement of vital parameters under various conditions, including movement and varying light environments, by optimizing signal quality through adaptive wavelength selection.
Implementation Method 1
light is radiated into the tissue by means of a light transmitter and the intensity of the light emerging from the tissue is recorded by means of a light receiver
Implementation Method 2
Pulse oximetry is based on detecting the reflection of emitted infrared light rays
Implementation Method 3
The light is modulated by the arterial blood so that the oxygen saturation and the pulse rate can be deduced
Implementation Method 4
one or more transmitters of light with wavelength ranges that differ from one another
Implementation Method 5
a front end can be arranged between the light receiver and the signal processor. The front end can be set up to convert the signal
Data Source
AI summary
A system for optically measuring vital parameters, in particular by means of the pulse oximetry method, is disclosed. The system (1) comprises a controller (4) configured to control one or more transmitters of light (2a, 2b, 2c) depending on a control signal from a signal processor (7) in such a way that the signal quality of an incoming signal is maximal, and the controller (4) is furthermore configured to select a wavelength range of the one or more transmitters of light (2a, 2b, 2c) on the basis of context information, the context information being selected from the group comprising movement information, location information, time information, light intensity information.