Blood Pressure Cuff–Curler Bonding with Local Bending Reinforcement
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Solution Overview
Problem
Blood pressure measurement devices face issues with cuff peeling from the curler due to stress concentration at the edge sides during inflation and contraction, especially in miniaturized wearable devices, which are exacerbated by reduced widths of the cuff and curler.
Innovation Solution
A blood pressure measurement device with a cuff structure that includes bag-like structures formed by welding two sheet members, featuring a bonded portion with higher bending strength than the bag-like structures, bonded to the curler, and integrated with a metal material to enhance junction strength and suppress peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the widths of the cuff and curler are increased to increase the bonding area, then the junction strength between the curler and cuff is improved, but the device size increases and miniaturization is hindered
Solution Approach 1:
The bonded portion is designed with locally enhanced properties (higher bending strength) compared to the rest of the cuff structure. This localized reinforcement at the bonding interface provides sufficient junction strength without requiring increased overall width of the cuff and curler, thus maintaining device miniaturization.
Solution Approach 2:
The cuff structure combines different materials with complementary properties: a flexible bag-like structure for inflation/contraction functionality and a bonded portion with higher bending strength for structural stability at the bonding interface. This composite approach enables the cuff to maintain both flexibility and bonding strength without increasing overall dimensions.
2Reliability
If the cuff is inflated to occlude blood vessels, then blood pressure measurement is enabled, but stress concentrates on the edge sides of the cuff causing peel-off from the curler
Solution Approach 1:
The bonded portion is designed with locally enhanced properties (higher bending strength) compared to the rest of the cuff structure. This localized reinforcement at the bonding interface provides sufficient junction strength without requiring increased overall width of the cuff and curler, thus maintaining device miniaturization.
Solution Approach 2:
The bonded portion is pre-designed with higher bending strength before inflation occurs. This preliminary structural preparation ensures that when the cuff is inflated for measurement, the bonding interface is already equipped to handle the resulting stresses without peeling.
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 effectively suppresses peeling between the cuff and curler, allowing for miniaturization without increasing the cuff and curler widths, maintaining measurement accuracy.
Implementation Method 1
the bonded portion having a higher bending strength than the bag-like structure
Implementation Method 2
each of the bag-like structures being formed by welding two sheet members formed of resin materials
Data Source
AI summary
A blood pressure measurement device (1) includes a curler (5) curving in such a manner as to follow along a circumferential direction of a portion of a living body where the curler is attached, and a cuff (71), (74) including one or a plurality of bag-like structures (81), (101) stacked on one another and a bonded portion (82), (104) being bonded to the curler (5), each of the bag-like structures (81), (101) being formed by welding two sheet members (86) formed of resin materials, and configured to be inflated with a fluid, and the bonded portion (82), (104) integrally provided on the sheet member (86) of the bag-like structure (81), (101) disposed on the curler (5) side, the bonded portion (82), (104) having a higher bending strength than the bag-like structure (81), (101).