Compression Stocking Structure for Low-Stretch PAD Compression
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Solution Overview
Problem
Compression stockings for peripheral arterial disease (PAD) require significant stretching and are not recommended due to the risk of exacerbating the condition, limiting their use for patients with this disease.
Innovation Solution
A compression stocking with a tubular compression area using a weft thread with a core yarn of at least 470 dtex, allowing for minimal stretching of 5-25% during donning, and featuring a knitted fabric with increased stiffness for class I compression pressure, adapted to individual leg circumferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional compression stockings are used, then compression therapy is provided, but significant stretching is required making them difficult to put on
Solution Approach 1:
The patent changes the physical parameters of the weft thread by specifying a fineness of at least 470 dtex, which is comparatively thick for compression class I stockings. This parameter change reduces the elasticity of the knitted fabric, allowing the stocking to fit the leg circumference more closely without requiring excessive stretching during donning.
2Ease of operation
If compression stockings are stretched considerably to fit, then they can be put on, but the risk of exacerbating peripheral arterial disease increases
Solution Approach 1:
By changing the weft thread fineness parameter to at least 470 dtex, the stocking achieves a balance where it requires minimal stretching (5-25%) to don, thereby reducing the harmful over-compression risk for PAD patients while still providing the necessary compression therapy effect.
Solution Approach 2:
The patent applies different thread characteristics locally in the compression area versus other areas of the stocking. The compression area uses the thick weft thread (≥470 dtex) to provide stable compression with minimal stretching requirement, while other areas can maintain different properties for overall fit and comfort.
3Stress or pressure
If thin weft threads are used, then the stocking is more elastic and easier to put on, but the compression pressure is insufficient
Solution Approach 1:
The patent identifies and changes the critical parameter of weft thread fineness to at least 470 dtex, which optimizes the balance between compression pressure delivery and ease of donning. This specific parameter value ensures sufficient compression for therapy while reducing elasticity to minimize required stretching.
4Manufacturing precision
If custom-made stockings with precise fit are manufactured, then compression effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
By standardizing the weft thread fineness at ≥470 dtex, the patent simplifies the manufacturing process while achieving precise fit. This parameter specification allows for consistent production of stockings that require minimal stretching (5-25%), reducing the need for complex custom adjustments and simplifying the manufacturing workflow.
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 stocking can be easily put on without a donning aid, providing effective compression for PAD patients with reduced resting pressure and increased working pressure, improving symptoms.
Implementation Method 1
the weft thread has a core thread with a fineness of at least 470 dtex... the compression area in the ankle area is stretched by at least 5% and at most 25% when the compression stocking is put on
Data Source
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AI summary
The present invention relates to compression stockings, in particular of compression class I, methods for the production thereof and the use of such compression stockings. The present invention relates in particular to a compression stocking having a tubular compression zone, said compression zone preferably exerting a pressure in the ankle region of at least 2.4 kPa and not more than 2.8 kPa, and the compression zone being formed by a knitted fabric having a weft thread, characterized in that the weft thread has a core thread with a fineness of at least 470 dtex.