Compression Hosiery Knit Structure for Progressive Compression
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Solution Overview
Problem
Conventional hosiery garments do not effectively provide a progressive and comfortable compression profile, and require expensive medical knitting machines to achieve desired compression levels, limiting their accessibility and versatility.
Innovation Solution
A compression hosiery garment with an alternating knit construction featuring an inverse course shift, using a covered elastic yarn and an inelastic yarn, which is knit on a standard machine, providing a progressive compression profile and varying opacity levels without the need for medical machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hosiery garments are used, then they provide basic comfort and support, but they do not effectively provide progressive compression profile and require expensive medical knitting machines
Solution Approach 1:
The patent changes the knitting parameters by implementing an inverse course shift where the first yarn (elastic) has a greater course height than the second yarn (inelastic). This parameter change enables the fabric to provide progressive compression without requiring expensive medical knitting machines, as the compression profile is achieved through the structural parameter modification rather than specialized equipment
Solution Approach 2:
The patent uses a composite yarn structure with a first yarn comprising an elastic core (such as spandex) and a second yarn comprising an inelastic material (such as nylon or polyester). This composite material approach allows the fabric to achieve medical-grade compression properties through the combination of elastic and inelastic materials, eliminating the need for expensive specialized manufacturing equipment
2Stress or pressure
If standard hosiery measurement standards are used, then they are easier to manufacture, but they provide a lesser degree of compression compared to medical compression garments
Solution Approach 1:
The patent segments the knit fabric into alternating courses with different yarn types and course heights. The first courses use elastic yarn with greater height, while the second courses use inelastic yarn with lesser height. This segmentation creates distinct compression zones that collectively provide the progressive compression profile required to meet medical standards while maintaining a manageable construction complexity
Solution Approach 2:
The patent applies local quality by varying the course height and yarn elasticity at different locations within the knit fabric. The inverse course shift creates localized areas of different compression, with the elastic yarn courses providing greater compression and the inelastic yarn courses providing structural support. This local variation in quality enables the fabric to achieve medical-grade compression values through controlled structural differences rather than uniform complexity
3Reliability
If inverse course shift is implemented with alternating knit construction, then progressive compression profile is achieved, but the knit fabric structure becomes more complex
Solution Approach 1:
The patent extracts the compression-generating function from complex medical knitting machines and embeds it directly into the knit fabric structure itself. By incorporating the inverse course shift and alternating yarn construction directly into the fabric, the progressive compression profile is achieved through the fabric's inherent structure rather than through complex external manufacturing equipment, thereby reducing device complexity while maintaining compression reliability
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 solution achieves a comfortable and progressive compression profile, meeting medical standards while being cost-effective and accessible, using standard knitting machines, and offering adjustable compression values and transparency.
Implementation Method 1
the first yarn including a covered yarn having an elastic core
Data Source
AI summary
A compression hosiery garment includes a knit fabric including a first yarn and a second yarn knit in an alternating knit construction and having at least one course of the second yarn for each course of the first yarn. The first yarn includes a covered yarn with an elastic core, such as a soft modulus elastic core, and the second yarn includes an inelastic yarn. The alternating knit construction includes an inverse course shift, where the first yarn is knit with a first course height that is greater than a second course height of the second yarn.