Pulse Wave Detector Housing with Segmented Rigidity for Wrist Stability
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Solution Overview
Problem
Existing biological information measuring devices face challenges in attaching the pressure sensor to the wrist due to the styloid process of the radius, leading to unstable positioning and displacement of the sensor, especially when the housing material has high or low rigidity.
Innovation Solution
A pulse wave detecting device with a housing configuration that includes a rigid portion for the sensor and a flexible portion to accommodate the styloid process, featuring a recess to absorb the process and prevent displacement, enhancing attachability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the housing is configured by a high rigidity material to stabilize the sensor position, then the sensor position stability is improved, but the housing easily enters an unstable state when contacting the styloid process of the radius
Solution Approach 1:
The housing is divided into two regions with different rigidity characteristics: a first housing portion with high rigidity to stabilize the sensor position, and a second housing portion with low rigidity to accommodate the styloid process of the radius. This local differentiation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The housing is segmented into multiple portions (first housing portion and second housing portion) with distinct mechanical properties. The first portion maintains sensor stability while the second portion provides flexibility for attachment, resolving the contradiction between overall rigidity and local adaptability.
2Reliability
If the whole housing is configured by a low rigidity material to avoid instability when contacting the styloid process, then the housing stability during attachment is improved, but the sensor position is easily displaced by external impact or user motion
Solution Approach 1:
Different regions of the housing are assigned different rigidity levels: the first housing portion containing the sensor maintains high rigidity to prevent displacement from external impacts, while the second housing portion has low rigidity to accommodate the styloid process during attachment.
Solution Approach 2:
The housing is divided into functionally distinct segments that independently address different requirements: one segment for sensor stability and another for attachment flexibility, eliminating the need to choose between conflicting overall properties.
3Ease of operation
If the pressure sensor is fixed to the band having low rigidity to improve attachability, then the ease of attachment is improved, but the sensor position is easily displaced after attachment
Solution Approach 1:
The device separates the attachment function (performed by the flexible band) from the sensor positioning function (performed by the rigid first housing portion). The band provides ease of attachment while the rigid housing portion maintains sensor position stability, preventing the contradiction from affecting the sensor.
Solution Approach 2:
The first housing portion acts as an intermediary structure between the flexible band and the sensor, isolating the sensor from the positional instability caused by band flexibility while still allowing the band to perform its attachment function.
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 achieves improved attachability and prevents sensor displacement, ensuring accurate pulse wave detection by stabilizing the sensor position and accommodating the styloid process, regardless of wrist shape or external impacts.
Implementation Method 1
a second housing portion which is lower in rigidity than the first housing portion... a region of the housing is configured by at least the second housing portion, the region being contacted with a styloid process of a radius
Implementation Method 2
a pulse wave detection sensor for detecting a pulse wave from a radial artery
Data Source
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AI summary
A pulse wave detecting device in which the attachability can be improved while preventing the position of a pulse wave detection sensor from being displaced is provided. A pulse wave detecting device which is to be used while being attached to the wrist H of a subject includes a housing 20 which accommodates a pulse wave detector 10 for detecting a pulse wave from the radial artery TD. The housing 20 includes: a first housing portion (1a, 1b), and a second housing portion (2) which is lower in rigidity than the first housing portion. The pulse wave detector 10 is accommodated in the first housing portion (1a). A region 2c of the housing 20 is configured by at least the second housing portion (2), the region being contacted with the styloid process Ta of the radius T of the wrist H in a state where the housing 20 is attached to the wrist.