Wrist Blood Pressure Cuff Joining Strength via Dimensional Expansion
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Solution Overview
Problem
Blood pressure measurement devices face accuracy issues due to wrinkles or folds in the cuff, which reduces measurement accuracy, and increasing the junction margin between the cuff and curler leads to a larger device size, making it unsuitable for wearable devices.
Innovation Solution
A blood pressure measurement device design featuring a cuff with a second facing portion larger in width, joined to a curler with a first facing portion, and a cover member to enhance the joining strength between the cuff and curler, preventing an increase in device size by increasing the junction area without enlarging the device's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the junction margin between the cuff and curler is increased to improve joining strength, then the joining strength is improved, but the device size increases
Solution Approach 1:
The patent applies dimensionality change by making the second facing portion of the cuff larger than other portions in the width direction, creating a localized expansion in one dimension (width) while maintaining compactness in other dimensions. This allows increased junction area without proportionally increasing overall device volume.
Solution Approach 2:
The patent applies local quality by creating a specific region (the second facing portion) with different dimensional characteristics than the rest of the cuff. This localized enlargement of the facing portion in the width direction provides enhanced joining area exactly where needed, without requiring the entire device to be larger.
2Strength
If the junction area between the cuff and curler is increased to improve joining strength, then the joining strength is improved, but the appearance size of the device increases
Solution Approach 1:
The patent increases the junction area by expanding the second facing portion in the width direction (one dimension) while keeping the overall device appearance compact. This dimensional change allows the junction area to be larger without proportionally increasing the device's appearance in all dimensions.
Solution Approach 2:
The patent creates a localized region (second facing portion) with enhanced width specifically for joining purposes. This local dimensional enhancement increases the visible junction area without requiring the entire device appearance to be enlarged.
Data Source
AI summary
A blood pressure measurement device enabling an increase in joining strength between a cuff and a junction target preventing an increase in size of the blood pressure measurement device. The device includes a case including an outer case having a tubular shape, a curler curving in such a manner as to follow along a circumferential direction of a portion of the wrist where the blood pressure measurement device is attached, the curler including a first facing portion aligned at one end of the outer case in a thickness direction, and a back-side cuff formed of two sheets formed of a resin material, the back-side cuff being configured to be inflated with a fluid, one of the sheet members that is disposed on the curler side including a second facing portion facing the first facing portion, and the second facing portion being larger than other portions of the back-side cuff.