Swinging Pulse Wave Sensor for Artery Angle Alignment
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Solution Overview
Problem
Pulse wave measuring devices face challenges in accurately detecting weak signals due to the need for the pulse wave sensor's detection surface to be approximately parallel with the subject's artery, which is not easily achieved with existing designs.
Innovation Solution
A pulse wave measuring device with a cylindrical part, pulse wave sensor, cap, and attaching part that allows the sensor's detection surface to swing on a fulcrum, enabling it to follow the artery's angle by using a pivot part and recessed portion for contact, ensuring parallel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pulse wave sensor is fixed in a rigid position, then the device structure is simple, but the detection surface cannot follow the artery's angle
Solution Approach 1:
The pulse wave sensor is designed with a swinging capability around a fulcrum, transitioning from a fixed rigid position to a dynamically adjustable position. The sensor can rotate around the fulcrum formed by the contact between the protruding portion and recessed portion, allowing the detection surface to adapt to different artery angles while maintaining a relatively simple overall structure.
Solution Approach 2:
The sensor mounting structure incorporates rotation around an axis perpendicular to the detection surface, adding a rotational degree of freedom. This allows the sensor to adjust its orientation in three-dimensional space to match the artery's angle, solving the adaptability problem without significantly increasing structural complexity.
2Measurement precision
If the pulse wave sensor is made swingable to follow the artery angle, then measurement accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The sensor is designed with a swinging capability around a fulcrum, transitioning from a fixed rigid position to a dynamically adjustable position. The sensor can rotate around the fulcrum formed by the contact between the protruding portion and recessed portion, allowing the detection surface to adapt to different artery angles while maintaining a relatively simple overall structure.
Solution Approach 2:
The sensor mounting structure incorporates rotation around an axis perpendicular to the detection surface, adding a rotational degree of freedom. This allows the sensor to adjust its orientation in three-dimensional space to match the artery's angle, solving the adaptability problem without significantly increasing structural complexity.
3Stability of the object's composition
If the pulse wave sensor is held firmly to reduce rattling, then measurement stability is improved, but the sensor cannot adapt to different artery angles
Solution Approach 1:
The pulse wave sensor is designed with a swinging capability around a fulcrum, transitioning from a fixed rigid position to a dynamically adjustable position. The sensor can rotate around the fulcrum formed by the contact between the protruding portion and recessed portion, allowing the detection surface to adapt to different artery angles while maintaining a relatively simple structure.
Solution Approach 2:
The sensor automatically adjusts its angle by swinging around the fulcrum to align with the artery's orientation. The protruding portion and recessed portion design allows the sensor to self-position itself for optimal detection alignment without requiring external adjustment mechanisms, maintaining stability once positioned.
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 enhances pulse wave measurement accuracy by allowing the detection surface to follow the artery's angle, improving signal detection and reducing rattling, while maintaining a small form factor and ease of attachment.
Implementation Method 1
a pulse wave sensor including a housing, a strain generating body provided on one side of the housing
Data Source
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AI summary
The present pulse wave measuring device includes: cylindrical part; pulse wave sensor including housing, strain generating body on one side of housing, and facing part on the other side of housing, pulse wave sensor being held inside cylindrical part such that strain generating body is exposed from axial-direction one end of cylindrical part; cap fixed to axial-direction other end of cylindrical part; and attaching part connected to outer side of cylindrical part and attachable to a subject. First surface of facing part and second surface of cap face each other. Pivot part is provided on one of first or second surface. Recessed portion into which pivot part can be inserted is opened in the other of first and second surfaces. When pivot part and recessed portion are in contact, the pulse wave sensor can swing on a fulcrum, which is the contact between the pivot part and the recessed portion.