Pressure Pulse Wave Detector With Dual-Axis Rotation
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Solution Overview
Problem
Existing biometric information measurement devices face challenges in accurately detecting pressure pulse waves due to difficulties in positioning sensors relative to the artery, particularly when the position of the artery changes under pressure, and in maintaining detection accuracy across varying wrist shapes and movements.
Innovation Solution
A biometric information measurement device featuring a pressure pulse wave detector with a pressing member, a pressing mechanism, a rotation driving mechanism, and a support mechanism that allows the pressing face to be rotated around two perpendicular axes, ensuring optimal alignment with the artery and accommodating movement, while a movement mechanism adjusts the support member's position for improved contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is pressed onto the living body part to improve detection accuracy, then the detection precision of pressure pulse waves is improved, but the position of the artery changes due to pressing force making it difficult to maintain optimal positioning
Solution Approach 1:
The patent implements a rotation driving mechanism that can rotate the pressing face around two axes (first axis extending in the array direction and second axis perpendicular to it) to dynamically adjust the sensor position. This dynamic adjustment capability allows the system to compensate for artery position changes caused by pressing force, maintaining optimal positioning while applying sufficient pressure for accurate detection.
Solution Approach 2:
The patent changes the positional parameters of the pressure sensor array by rotating the pressing face around two perpendicular axes. The rotation amounts around these axes are independently adjustable, allowing precise control over the sensor's position relative to the artery to maintain optimal detection geometry despite pressing-induced artery displacement.
2Adaptability or versatility
If the sensor group is divided into multiple division areas with individual height adjustment to adapt to hand movement, then the adaptability to varying body shapes is improved, but the ability to maintain precise positioning for pulse wave detection is reduced
Solution Approach 1:
The patent divides the sensor system into a pressure sensor array arranged in multiple rows and columns, with the pressing face capable of independent rotation around two axes. This segmented approach allows different portions of the sensor array to be independently positioned relative to the artery, enabling both adaptation to body shape variations and maintenance of precise detection positioning.
Solution Approach 2:
The patent adds rotational freedom in two dimensions (around first axis extending in array direction and second axis perpendicular to it) to the traditional single-axis or fixed-position sensor arrangements. This two-dimensional rotation capability enables the pressing face to adapt to varying wrist shapes while maintaining optimal sensor-artery alignment for accurate pulse wave detection.
3Ease of operation
If manual adjustment mechanisms are provided to change sensor contact state, then the ease of operation is improved, but the automation and consistency of positioning is reduced
Solution Approach 1:
The patent incorporates a rotation driving mechanism that can automatically adjust the pressing face position without requiring manual intervention. The mechanism uses rotation amounts detectable by the control unit to autonomously position the sensor array optimally, eliminating the need for manual adjustment while maintaining ease of use through automated positioning.
Data Source
AI summary
A pressure pulse wave detector includes: a pressing member which includes a pressing face in which element arrays each including pressure detecting elements arranged in one direction are arranged in a direction intersecting with the one direction; a pressing mechanism which presses the pressing face against a body surface of a living body; a rotation driving mechanism which rotates the pressing face around each of two axes which are perpendicular to a pressing direction of the pressing face pressed by the pressing mechanism and include a first axis extending in the one direction and a second axis perpendicular to the one direction; a support member which supports the pressing mechanism, the rotation driving mechanism and the pressing member; a housing which houses therein the support member; and a movement mechanism which moves the support member in the one direction inside the housing.