Head-Mounted Sensor Positioning for Blood Flow Signal Strength
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Solution Overview
Problem
Biological information measurement devices face challenges in accurately measuring signals due to weak acquired signal strength, especially when the wearer moves, affecting the accuracy of blood flow volume, oxygen content, and pulse wave measurements.
Innovation Solution
A wearable biological information measurement device with a sensor positioned over arteries and veins on the head, utilizing a combination of optical sensors and movement detection sensors to correct for movement effects, and a flexible design that maintains constant contact with the skin to enhance signal strength and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor is positioned on the head to measure biological information, then the measurement location is fixed and portable, but the signal strength becomes weak due to variations in physique and deviations from optimal measurement position
Solution Approach 1:
The patent applies local quality by specifically positioning the sensor at the temporal region of the head where blood vessels are naturally closer to the skin surface. This localized positioning strategy exploits the anatomical characteristic of the temporal area to achieve stronger signal strength while maintaining portability. The wearing portion is designed to target this specific region, making the most of the local anatomical features to overcome the general weakness of head-based measurements.
2Measurement precision
If the sensor is positioned to oppose arteries or veins for accurate measurement, then measurement accuracy improves, but the device structure becomes more complex requiring precise positioning mechanisms
Solution Approach 1:
The patent applies self-service by utilizing the body's own anatomical features to achieve proper sensor positioning. The temporal region's natural anatomy, with its superficial blood vessels and relatively thin tissue layer, automatically provides the optimal measurement interface. The wearing portion is designed to conform to this natural anatomy, eliminating the need for complex active positioning mechanisms. The structure leverages the body's own characteristics to perform the positioning function.
3Reliability
If elastic members are added to maintain consistent contact between sensor and skin, then measurement stability improves, but the device weight and structure increase
Solution Approach 1:
The patent applies flexible shells and thin films through the use of elastic members that are integrated into the wearing portion structure. These elastic members are designed as thin, flexible components that provide the necessary contact pressure without adding significant weight. The elastic members act as compliant interfaces between the rigid sensor housing and the soft skin surface, maintaining consistent contact while keeping the overall device lightweight and comfortable for extended wear.
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 improved accuracy in measuring blood flow volume, oxygen content, and pulse wave by positioning sensors over large blood vessels on the head and using elastic members to maintain contact and correct for movement, resulting in higher signal strength and reliability.
Implementation Method 1
measuring light from a light emitting element and receiving, at a light receiving element, reflected light from the measured part
Implementation Method 2
measuring light from a light emitting element and receiving, at a light receiving element, reflected light from the measured part
Data Source
AI summary
A biological information measurement device comprising a sensor configured to measure biological information, wherein the sensor is supported by a wearing portion configured to be worn on a head of a human body, and is located at a position opposing at least any of an artery and a vein in the head when in a state in which the wearing portion is worn on the head.