Wrist Sphygmomanometer Antenna Segmentation
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Solution Overview
Problem
Conventional biological information measuring devices with both blood pressure measurement and pulse wave measurement functions using radio waves face issues such as antenna detachment or deformation during repeated pressurization and depressurization, and discomfort to the subject due to skin contact.
Innovation Solution
A biological information measuring device with a band-shaped member surrounding the artery, a pressing member for blood pressure measurement, and antenna support members installed on the band member away from the pressing surface, allowing for stable signal transmission and reception without skin contact during pressurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting antenna and receiving antenna are attached to the pressing surface of the pressure cuff, then the pulse wave measurement function is achieved, but the antenna support member deteriorates during repeated pressurization and depressurization
Solution Approach 1:
The device is divided into distinct functional zones: the pressing member for blood pressure measurement and the antenna support member for pulse wave measurement. The antenna support member is positioned in a region where the pressing member is not disposed, creating spatial separation between the two functions. This segmentation prevents the antenna support member from being subjected to pressurization stress while maintaining both measurement capabilities.
Solution Approach 2:
The antenna support member and antenna elements are extracted from the pressing surface area and positioned in a separate region of the band member. This extraction removes the antenna support member from the high-stress zone during pressurization, preventing deterioration while maintaining pulse wave measurement functionality through radio wave transmission to the artery.
2Measurement precision
If the transmitting antenna and receiving antenna are pressed against the skin by pressurization of the pressure cuff, then the antenna contact with the measured part is improved, but the subject feels discomfort such as pain on the skin
Solution Approach 1:
The band member is segmented into a pressing region and an antenna region. The pressing member is disposed only in the pressing region, while the antenna support member is installed in the antenna region where no pressing occurs. This segmentation allows the artery to be contacted by radio waves for pulse wave measurement without applying mechanical pressure through the antenna components, eliminating skin discomfort while maintaining measurement precision.
Solution Approach 2:
Radio waves serve as an intermediary between the antenna elements and the artery for pulse wave measurement. Instead of requiring direct mechanical contact between the antenna support member and the artery (which would cause discomfort), the antenna elements transmit and receive radio waves that interact with the artery's electromagnetic properties, enabling non-contact measurement.
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
Enhances device reliability by preventing antenna deterioration and reduces subject discomfort, while maintaining signal quality through appropriate antenna positioning and pressure contact.
Implementation Method 1
The antenna element operates so as to transmit a measurement signal composed of a radio wave to the measured part and to receive a reflection signal of the measurement signal from the measured part
Implementation Method 2
a pressing member, disposed on a surface of the band member that faces the measured part, expanding due to injection of a fluid during blood pressure measurement and pressing the measured part
Data Source
AI summary
An embodiment of the present invention provides a sphygmomanometer that is worn on a measured part of the left wrist of a subject (user) for use. In the sphygmomanometer, on an inner peripheral surface of a band-like body that constitutes a base of a band, a portion for installing a pressure cuff and a protrusion for installing an antenna substrate are separately provided, and the pressure cuff and the antenna substrate are respectively installed on these portions.