Blood Pressure Cuff Inner Cover Wrinkle Prevention
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Solution Overview
Problem
Conventional blood pressure monitor cuffs with curled elastic members experience wrinkles during application, leading to non-uniform compressive force on arteries and reduced accuracy in blood pressure measurement, particularly at regions with large and small curvature areas.
Innovation Solution
The cuff design includes an inner wall portion stretched in the width direction at large curvature regions and slackened at small curvature regions to prevent wrinkles, ensuring uniform compressive force when inflated, with the inner wall being more elastic than the outer wall to facilitate smooth inflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner cover member is made with higher elasticity to avoid obstructing inflation, then the air bag can inflate smoothly, but wrinkles occur in the inner cover member at large curvature regions
Solution Approach 1:
The patent applies different elasticity characteristics to different regions of the inner cover member. At large curvature regions (where wrinkles occur), the inner cover member has lower elasticity to prevent wrinkles. At small curvature regions, it maintains higher elasticity to facilitate inflation. This local differentiation resolves the contradiction between inflation smoothness and wrinkle prevention.
Solution Approach 2:
The patent changes the elasticity parameter of the inner cover member based on position. By adjusting the material properties or structural configuration at different locations (particularly reducing elasticity at large curvature regions), the system achieves both smooth inflation and wrinkle-free surface, resolving the technical contradiction.
2Adaptability or versatility
If the cuff is designed to fit the living body with large and small curvature regions, then the cuff conforms to body shape, but wrinkles occur intensively at large curvature regions
Solution Approach 1:
The patent implements local quality by making the inner cover member have different elasticity properties at different locations. Specifically, at large curvature regions where the cuff must conform to body shape, the inner cover member has reduced elasticity to prevent wrinkle formation while maintaining body conformity.
Solution Approach 2:
The patent introduces asymmetry in the elasticity distribution of the inner cover member. Rather than uniform elasticity throughout, the material properties are asymmetrically distributed to match the curvature variations, with lower elasticity at large curvature regions and higher elasticity at small curvature regions.
3Manufacturing precision
If the inner wall portion is stretched in the width direction at large curvature regions, then wrinkles are prevented, but the structure becomes more complex
Solution Approach 1:
The patent achieves wrinkle prevention through local quality by stretching the inner wall portion specifically at large curvature regions while maintaining the original structure at other regions. This localized modification prevents wrinkles without requiring complex structural changes throughout the entire cuff.
Solution Approach 2:
The patent segments the inner cover member into different regions with different elasticity characteristics. By dividing the structure and applying different properties to different segments (particularly stretching at large curvature regions), the system prevents wrinkles while keeping the overall structure relatively simple.
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
This configuration minimizes wrinkles and ensures a uniform compressive force over the entire area, enhancing the accuracy of blood pressure measurement.
Implementation Method 1
a curled elastic member, identified as an elastic member, within the bag-shaped cover body and on the outer side of the air bag, so as to facilitate the operation of applying the cuff by the subject and also to allow the air bag to expand smoothly toward the living body at the time of pressurizing the air bag after application of the cuff
Implementation Method 2
in a state where the fluid bag is deflated, the inner wall portion at a portion corresponding to the large curvature region of the elastic member is stretched in the width direction
Data Source
AI summary
A cuff for a blood pressure monitor includes a bag-shaped cover body containing an air bag and a curled elastic member as a curved elastic plate. The bag-shaped cover body is formed by stacking an inner cover member located on a living body side when applied and an outer cover member located on a side opposite to the living body side when applied, one on the other, and sewing their rims. The curled elastic member contained in the bag-shaped cover body includes a large curvature region and a small curvature region in a winding direction thereof to fit a measurement site. In a state where the air bag is not inflated, the inner cover member at a portion corresponding to the large curvature region of the curled elastic member is stretched in a width direction thereof. With this configuration, a cuff for a blood pressure monitor which is less likely to have wrinkles in a bag-shaped cover body can be provided.