Wearable Blood Pressure Cuff Joining Structure Against Peeling
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Solution Overview
Problem
Blood pressure measurement devices face issues with cuff peeling due to concentrated stress on the joining layer when inflated, particularly in wearable devices where miniaturization demands limit the width of the cuff and curler, leading to increased susceptibility of peeling.
Innovation Solution
A blood pressure measurement device design featuring a cuff with bag-like structures that are inflated and deformed, with joined portions on the edge facing the curler, using a joining layer like double-sided tape to secure the cuff to the curler, ensuring shear stress distribution and maintaining the joining area, even when inflated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the width of the cuff and curler is increased to improve joining strength, then the joining area increases and peeling is suppressed, but the device size increases and miniaturization is hindered
Solution Approach 1:
The patent applies local quality by concentrating the joining function at specific locations (edge portions of the bag-like structure) rather than distributing it uniformly. The joined portions are strategically positioned at the edges where stress concentration occurs during inflation, providing enhanced joining strength precisely where needed without increasing the overall device width.
Solution Approach 2:
The patent transitions from a two-dimensional joining approach (increasing width) to a three-dimensional solution by positioning joined portions at the edge portions of the bag-like structure. This spatial reconfiguration allows the joining area to be optimized in a different dimensional orientation, maintaining strength while preserving miniaturization.
2Measurement precision
If the cuff is inflated more at the central side than at the edge side, then the cuff achieves proper inflation for measurement, but stress concentrates on the joining layer at the edge side causing peeling
Solution Approach 1:
The patent applies preliminary action by pre-positioning joined portions at the edge portions of the bag-like structure before inflation occurs. This anticipatory placement ensures that the joining layer is already positioned to withstand the stress concentration that will occur during inflation, preventing peeling before it happens rather than reacting after damage occurs.
Solution Approach 2:
The patent changes the spatial parameter of the joining layer by positioning it at the edge portions rather than uniformly distributing it. This parameter change aligns the joining layer with the stress concentration zones created during inflation, allowing the cuff to be inflated adequately for measurement while the joined portions handle the resulting stress.
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 effectively suppresses cuff peeling during inflation, maintains accurate blood pressure measurement, and facilitates easy assembly by ensuring strong integration of the cuff and curler without increasing their width.
Implementation Method 1
a cuff that is wrapped around an upper arm, a wrist, or the like of a living body when blood pressure is measured and that is inflated by being fed with a fluid
Implementation Method 2
the cuff is joined and fixed to the curler with a joining layer such as double-sided tape to integrate the cuff with the curler
Implementation Method 3
when the cuff is repeatedly inflated and deflated, there is a risk that the cuff will be peeled away from the curler
Data Source
AI summary
A blood pressure measurement device includes a curler that curves to follow a circumferential direction of a site of a living body where the curler is attached, and a cuff. The cuff includes a plurality of bag-like structures layered on one another, each of the plurality of bag-like structures being elongated in one direction, formed by welding two sheet members formed of a resin material, and configured to be inflated with a fluid, and a joined portion provided on at least a portion of an edge portion of the bag-like structure disposed facing the curler, the joined portion being formed by a portion of the sheet members constituting the bag-like structure disposed facing the curler and joined to an outer circumferential surface side of the curler.