Sensor Unit Rotation for Artery Tracking
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Solution Overview
Problem
Existing bodily information measurement apparatuses face challenges in accurately measuring pressure pulse waves due to the difficulty in maintaining optimal positional alignment between pressure sensors and arteries, as the position of the artery changes with pressing force, and existing solutions do not adequately account for these changes.
Innovation Solution
A pressure pulse wave measurement apparatus featuring a sensor unit with pressure detection elements arranged in one direction, a pressing unit to press against the body surface, and a rotation control member that rotates the sensor unit about two axes orthogonal to the pressing direction, allowing for flexible adjustment of the contact state to maintain accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is pressed against a body region to measure bodily information, then the measurement can be obtained, but the position of the artery changes due to the pressing force, causing measurement inaccuracy
Solution Approach 1:
The sensor unit is made rotatable about two orthogonal axes (first axis and second axis) that are perpendicular to the pressing direction. The rotation control member enables dynamic adjustment of the sensor unit's orientation to track and follow the artery's position changes caused by pressing force, allowing the system to adapt in real-time rather than relying on fixed positioning
Solution Approach 2:
The system uses the pressure pulse wave output signal as feedback to determine the appropriate rotation angle of the sensor unit. When the artery position shifts due to pressing, the feedback mechanism adjusts the sensor's orientation to maintain optimal alignment with the artery, creating a closed-loop control system that compensates for position changes
2Device complexity
If the sensor unit is fixed in position to simplify the device structure, then the device complexity is reduced, but the ability to follow artery position changes is lost
Solution Approach 1:
Instead of a fixed sensor position, the invention implements a dynamic positioning system where the sensor unit can rotate about two orthogonal axes. This dynamic capability allows the sensor to adapt to varying artery positions while maintaining a relatively simple overall device structure through the use of rotation control mechanisms
Solution Approach 2:
The rotation control member with two orthogonal rotation axes provides multi-functional capability, allowing the sensor unit to adjust in multiple directions to accommodate different artery positions and orientations. This universal adjustment mechanism can handle various positioning scenarios without requiring multiple separate positioning systems
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
This solution enhances the accuracy of pressure pulse wave measurement by enabling flexible adjustment of the sensor unit's position relative to the artery, improving the detection and calculation of blood pressure information.
Implementation Method 1
a sensor unit in which an element column including a plurality of pressure detection elements that are arranged side by side in one direction is formed
Implementation Method 2
a first motion conversion mechanism for converting a rotational motion realized by the first rotation member being rotated, into a rotational motion of the sensor unit about one of the two axes, and the first member and the second rotation member both include a second motion conversion mechanism for converting a rotational motion realized by the second rotation member being rotated, into a rotational motion of the sensor unit about the other of the two axes
Data Source
AI summary
A pressure pulse wave measurement apparatus includes: a sensor unit; a pressing unit configured to press the sensor unit; and a rotation control member configured to rotate the sensor unit about each of two axes orthogonal to a pressing direction of the pressing unit. The rotation control member includes a first member, a first rotation member and a second rotation member. The first member and the first rotation member both include a first motion conversion mechanism for converting a rotational motion realized by the first rotation member being rotated, into a rotational motion of the sensor unit about one of the two axes, and the first member and the second rotation member both include a second motion conversion mechanism for converting a rotational motion realized by the second rotation member being rotated, into a rotational motion of the sensor unit about the other of the two axes.