Multi-Wavelength Pulse Wave Sensor Channel Selection
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Solution Overview
Problem
Existing methods for estimating cardiovascular characteristics without a pressure cuff, such as pulse wave analysis (PWA) and pulse wave velocity (PWV), face challenges in achieving accurate and reliable measurements.
Innovation Solution
The proposed apparatus and method utilize a pulse wave sensor with multiple channels emitting light of different wavelengths to detect scattered or reflected light, and a processor to convert phase delays into Lissajous waveforms, allowing for the selection of an optimal channel based on specific criteria for improved bio-information estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pulse wave analysis (PWA) or pulse wave velocity (PWV) methods are used to extract cardiovascular characteristics without a pressure cuff, then the convenience and non-invasiveness are improved, but the measurement accuracy and reliability deteriorate
Solution Approach 1:
The patent segments the pulse wave measurement into multiple channels, each detecting pulse waves at different locations or depths. By dividing the measurement into multiple segments (channels) and selecting the optimal one, the system achieves both convenience and improved accuracy in cardiovascular characteristic measurement
Solution Approach 2:
The patent changes the parameter of light wavelength by using multiple wavelengths (e.g., red and infrared) to detect pulse waves. This parameter change enables differentiation between arterial and venous components, improving the accuracy of cardiovascular measurements while maintaining non-invasive convenience
2Measurement precision
If multiple channels with different wavelengths are used to detect pulse waves, then the accuracy of bio-information estimation is improved, but the device complexity increases
Solution Approach 1:
The patent makes the pulse wave sensor multi-functional by enabling it to perform both oxygen saturation measurement and cardiovascular characteristic extraction using the same hardware components. The multiple channels serve dual purposes, reducing overall device complexity while maintaining high measurement accuracy
Solution Approach 2:
The patent merges the functionality of multiple channels into a unified sensor system that simultaneously captures pulse wave signals at different wavelengths and locations. By combining these channels and applying systematic selection criteria, the system achieves high accuracy without proportionally increasing complexity
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 enhances the accuracy of bio-information estimation by selecting the most suitable channel for measuring cardiovascular characteristics, thereby improving the reliability of measurements compared to traditional methods.
Implementation Method 1
at least one light receiver configured to detect the light of the first wavelength and the light of the second wavelength, which is scattered or reflected from the object
Implementation Method 2
at least one light receiver configured to detect the light of the first wavelength and the light of the second wavelength, which is scattered or reflected from the object
Implementation Method 3
The at least one light receiver may include at least one of a photodiode array or a complementary metal-oxide semiconductor (CMOS) image sensor
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
An apparatus for estimating bio-information, the apparatus including a pulse wave sensor and a processor. The pulse wave sensor includes a plurality of channels, each channel of the plurality of channels being configured to measure a first pulse wave signal of a first wavelength and a second pulse wave signal of a second wavelength that is different from the first wavelength. The processor is configured to: for each channel of the plurality of channels, generate a first oscillogram based on the first pulse wave signal, generate a second oscillogram based on the second pulse wave signal, and convert a phase delay between the first oscillogram and the second oscillogram into an area. The processor is further configured to determine a channel among the plurality of channels based on the area of each channel, and estimate bio-information based on the determined channel.