Sensor Module Uneven Inner Surface Adhesion
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Solution Overview
Problem
Existing blood pressure measurement devices using the tonometry method face challenges in maintaining a strong holding force of the soft portion on the inner surface of the sensor module, leading to potential peeling off during use.
Innovation Solution
A sensor module design featuring a sensor base with a pressure sensor, a sensor head cover with uneven inner surfaces to increase adhesion area, and a soft portion filling the gap between the sensor base and head cover, which enhances the holding force and resistance to peeling off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a soft portion is formed by injecting resin material from the opening of the cover, then the soft portion can be created to contact the living body, but the soft portion peels off from the inner surface of the cover
Solution Approach 1:
The inner surface of the cover is given unevenness only in specific regions where the soft portion contacts it, while the outer surface remains smooth for comfort. This localized modification increases adhesion area without affecting the overall structure or user comfort.
Solution Approach 2:
The unevenness is formed on the inner surface of the cover before the soft portion is injected. This preliminary preparation of the surface ensures that when the resin material is injected, it adheres strongly to the pre-formed uneven surface, preventing peeling during subsequent use.
2Ease of manufacture
If the inner surface of the cover is made smooth, then the manufacturing process is simple, but the holding force onto the soft portion is insufficient
Solution Approach 1:
Instead of making the entire cover surface uneven (which would complicate manufacturing), only the inner surface that contacts the soft portion is given unevenness. This localized approach maintains manufacturing simplicity while achieving the required adhesive strength.
Solution Approach 2:
The surface roughness parameter is changed only for the inner surface of the cover, creating unevenness with a specific roughness value that enhances adhesion. The outer surface maintains its original smooth parameter for comfort and ease of manufacturing.
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 design significantly improves the holding force of the soft portion on the sensor module, making it resistant to peeling off and providing a better user experience with improved surface roughness and material selection for the sensor head cover.
Implementation Method 1
the adhering surface between the inner surface of the housing portion and the soft portion can be increased. Thus, the adhesive strength between the inner surface and the soft portion is increased
Data Source
AI summary
Provided is a sensor module, a method for manufacturing a sensor module, and a blood pressure measurement device that can improve the holding force onto a soft portion. A sensor module 63 of a blood pressure measurement device 1 includes: a sensor base 72; a pressure sensor portion 71 fixed to the sensor base 72; a sensor head cover 73 including, on an outer surface, an opening 73a in a region that comes into contact with a wrist 100 and an inner surface 73g formed with unevenness, the sensor head cover 73 being fixed to the sensor base 72 and forming a gap portion 79 that communicates with the opening 73a between the inner surface 73g, the sensor base 72, and the pressure sensor portion 71; anda soft portion 74 disposed in the gap portion 79 and, at least, filling up the opening 73a and covering the pressure sensor portion 71.