Alternating Light Emission Periods for Blood Flow and Oxygen Saturation Measurement
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Solution Overview
Problem
Current living-body information measurement devices face challenges in accurately measuring blood flow and oxygen saturation due to limitations in response performance of light emitting and receiving elements, which affect the precision of measurements, especially when trying to increase the frequency of flickering to improve accuracy.
Innovation Solution
A living-body information measurement device is designed with a control unit that manages the light-emission periods of different wavelength light emitting elements, allowing for non-overlapping or partially overlapping emission periods to enhance the measurement accuracy by optimizing the sampling period and response performance, particularly using a first light emitting element for blood flow measurement and a second for oxygen saturation, with the measuring unit processing the received light to calculate blood flow and oxygen saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light emitting elements are made to flicker at higher frequency to improve measurement accuracy, then the measurement precision improves, but the response performance limitation prevents achieving higher frequencies
Solution Approach 1:
The patent applies periodic action by controlling the light emitting elements to flicker alternately at different wavelengths in a periodic manner. The control unit generates control signals that cause the first and second light emitting elements to emit light in alternating periods, enabling the system to operate at higher effective frequencies for measurement purposes while respecting the individual response limitations of each light emitting element.
Solution Approach 2:
The patent implements preliminary action by having the light emitting elements emit light in predetermined alternating periods before the measurement cycle begins. The control unit pre-establishes the emission schedule for each light emitting element, ensuring that the timing and duration of each emission period are optimized in advance to maximize measurement accuracy within the response capabilities of the hardware.
2Adaptability or versatility
If multiple light emitting elements operate simultaneously to measure different parameters, then the measurement capability increases, but the interference between different wavelength lights increases
Solution Approach 1:
The patent uses periodic action to eliminate light interference by controlling multiple light emitting elements to operate alternately rather than simultaneously. The control unit generates timing signals that ensure only one light emitting element emits light at a time, with each element operating in its designated period. This temporal separation prevents spectral interference while maintaining the ability to measure multiple parameters such as blood flow and oxygen saturation.
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 achieves higher accuracy in measuring blood flow and oxygen saturation by optimizing the light-emission periods and response performance, reducing the impact of response limitations and allowing for more precise data acquisition, especially in higher frequency regions for blood flow measurements.
Implementation Method 1
a first light emitting element and a second light emitting element each that emits different light in wavelength
Implementation Method 2
a light receiving element that receives the light emitted from the first light emitting element and the second light emitting element
Data Source
AI summary
Provided is a living-body information measurement device including a first light emitting element and a second light emitting element each that emits different light in wavelength, a light receiving element that receives the light emitted from the first light emitting element and the second light emitting element, a control unit that controls a continuous light-emission period of each of the first light emitting element and the second light emitting element so that the continuous light-emission period of the second light emitting element is shorter than the continuous light-emission period of the first light emitting element, and a measuring unit that measures plural living-body information based on the light received in the light receiving element.