Vein-Authentication Cuff Layout for Accurate Blood Pressure Measurement
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Solution Overview
Problem
Conventional sphygmomanometers with vein authentication and blood pressure measurement functions struggle to accurately measure blood pressure due to the light openings on the contact surface interfering with the compression of arteries, preventing precise blood pressure calculation.
Innovation Solution
A sphygmomanometer design featuring a blood pressure measuring cuff that extends in a longitudinal direction around the measurement site, with a light projecting unit along the cuff's edge and a light receiving unit on its inner surface, allowing for vein authentication and accurate blood pressure measurement by comparing vein patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light projecting opening and light receiving opening are formed on the contact surface of the housing portion, then vein authentication function is enabled, but artery compression is impaired and blood pressure measurement accuracy deteriorates
Solution Approach 1:
The device is divided into two separate functional components: a housing portion with light openings for vein authentication, and a belt portion with air bag for blood pressure measurement. This segmentation allows each component to be optimized for its specific function without interfering with the other.
Solution Approach 2:
The light projecting opening and light receiving opening are extracted from the contact surface of the housing portion and relocated to the belt portion. This extraction removes the harmful interference of light openings on artery compression while preserving the vein authentication function.
2Adaptability or versatility
If air bag is included in the belt portion to enable blood pressure measurement, then blood pressure value measurement is enabled, but the simple belt structure is complicated
Solution Approach 1:
The air bag for blood pressure measurement is integrated into the belt portion, merging the blood pressure measurement function with the existing wrist-wearable structure. This combining approach enables multiple functions (vein authentication and blood pressure measurement) within a unified device design.
3Measurement precision
If light projecting unit is disposed along the edge portion of the cuff, then vein authentication is enabled without impairing compression performance, but the light opening position is constrained
Solution Approach 1:
The light projecting opening is positioned specifically along the edge portion of the belt in the width direction, creating a localized arrangement that provides sufficient light for vein authentication while avoiding the central compression area. This local quality approach optimizes both functions with minimal positional constraints.
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 accurate vein authentication and blood pressure measurement without impairing the cuff's compression performance, while maintaining a compact design and enhancing wiring reliability.
Implementation Method 1
receives the light scattered or reflected by the target region to obtain an image including a vein pattern of the target region
Implementation Method 2
receives the light scattered or reflected by the target region to obtain an image including a vein pattern of the target region
Data Source
AI summary
In the present invention, a blood pressure measuring cuff is worn around a rod-shaped site to be measured of a subject in a circumferential direction. A light projecting unit is disposed only along an edge portion on one side or both sides of the cuff in a width direction, and irradiates a periphery of a target region of the site to be measured with light. A light receiving unit is provided in a sheet shape along a specific portion facing the target region on an inner surface of the cuff, and receives light scattered or reflected by the target region to obtain an image including a vein pattern of the target region. An authentication unit compares the vein pattern with a reference vein pattern registered in advance, and performs the vein authentication on the subject.