Wrist Blood Pressure Cuff Segmentation for Wrinkle-Free Fit
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Solution Overview
Problem
Blood pressure measuring devices face accuracy issues due to the generation of wrinkles and folds in the cuff when worn on the wrist, leading to incorrect pressure distribution and measurement errors, especially as devices are downsized for wearable applications.
Innovation Solution
A blood pressure measuring device design featuring a curler that bends along the wrist's circumference, a strap to cover the outer surface, a sensing cuff with a rubber plate for elastic deformation, and a pressing cuff to prevent wrinkles and folds by ensuring close contact with the skin, along with a flat plate to compress the tendon area, ensuring uniform pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cuff is downsized for wearable applications, then the device portability and wearability are improved, but the accuracy of blood pressure measurement deteriorates due to wrinkle and fold generation
Solution Approach 1:
The cuff is divided into multiple independent inflatable sections (first cuff section, second cuff section, third cuff section) that can be inflated separately. This segmentation allows each section to independently adapt to the wrist contour, preventing wrinkle formation while maintaining a compact overall device size suitable for wearable applications.
Solution Approach 2:
Different regions of the cuff are designed with different inflatable characteristics. The first cuff section (near the artery) is inflated to a higher pressure than the second and third sections, creating a localized high-pressure zone that ensures accurate artery compression while the other sections provide support and prevent wrinkles without over-compression.
2Measurement precision
If the cuff pressure is increased to ensure close contact with the skin, then the measurement accuracy is improved, but the comfort and safety deteriorates due to excessive pressure on the wrist
Solution Approach 1:
The cuff pressure is segmented into different levels across multiple sections. Only the first cuff section near the artery is inflated to high pressure for accurate measurement, while the second and third sections are inflated to lower pressures, distributing the mechanical load and preventing excessive overall pressure on the wrist.
Solution Approach 2:
High pressure is localized to the first cuff section where the artery is located, ensuring accurate measurement. The second and third cuff sections maintain lower pressure levels, providing structural support and preventing wrinkles without contributing excessive pressure that would cause discomfort or safety issues.
3Measurement precision
If the cuff is inflated to suppress wrinkles and folds, then the measurement accuracy is improved, but the device complexity increases due to multiple inflatable sections
Solution Approach 1:
The cuff is segmented into three inflatable sections with independent control, allowing targeted inflation to suppress wrinkles in specific areas. This segmentation enables precise control over where and how wrinkles are prevented, improving measurement accuracy without requiring a completely complex alternative design.
Solution Approach 2:
The multiple inflatable sections are merged into a single integrated cuff structure that wraps around the wrist. This combining approach maintains relative structural simplicity while achieving the wrinkle-suppression function through coordinated inflation of the segmented sections, avoiding the need for separate independent components.
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 the generation of wrinkles and folds in the sensing cuff, maintaining accurate pressure distribution and enhancing measurement accuracy by ensuring the cuff is in close contact with the skin, thereby reducing measurement errors.
Implementation Method 1
a rubber plate provided on a side of the sensing cuff nearer to the curler and configured to elastically deform
Data Source
AI summary
A blood pressure measuring device includes a device main body; a curler configured to bend along a circumferential direction of a wrist of a living body, and configured to come into contact with a portion of the wrist at least between a dorsal side and a palmar side; a strap on the device main body, configured to cover an outer surface of the curler; a sensing cuff arranged in a region of the wrist where arteries exist; a rubber plate on a side of the sensing cuff nearer to the curler and configured to elastically deform; a pressing cuff between the curler and the rubber plate and configured to press the sensing cuff; and a cuff on a side of the curler nearer to the living body and arranged on the dorsal side of the wrist.