Knit fabric for orthopedic support material
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Solution Overview
Problem
Conventional orthopedic casting materials face challenges with fiberglass backings that generate dust during removal, limit conformability due to low extensibility, and can cause constriction, while non-fiberglass alternatives like polyester have limited extensibility and wrinkle issues, affecting the fit and comfort of casts.
Innovation Solution
A resin-coated knit fabric with a specific construction using synthetic organic microdenier and multifilament yarns, combined with a stretchable yarn, providing high extensibility and conformability without excessive elasticity, and minimizing resin pooling and wrinkling, using a unique knit structure with a high resin holding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiberglass backing material is used, then cast strength is improved, but fiberglass dust is generated during removal
Solution Approach 1:
The patent changes the material composition parameter from fiberglass to a blend of polyester fibers (70-90 wt%) and rayon fibers (10-30 wt%). This parameter change maintains cast strength while eliminating fiberglass dust generation, as the alternative fiber blend does not produce harmful dust particles during cast removal
Solution Approach 2:
The patent uses a composite fiber blend combining polyester and rayon in specific proportions. This composite material approach allows the fabric to achieve both strength requirements and the benefit of non-dust-generating properties, resolving the contradiction between strength and harmful dust generation
2Adaptability or versatility
If conventional polyester knit fabric is used, then conformability is improved, but extensibility is limited
Solution Approach 1:
The patent modifies the fabric structure parameter by creating a specific knit pattern with controlled loop formation and columnar structures. This structural parameter change enables the polyester-rayon blend fabric to achieve both good conformability and improved extensibility (15-25% elongation), resolving the contradiction between conformability and extensibility
3Length of moving object
If highly elastic yarns are incorporated to improve extensibility, then conformability is improved, but constriction risk increases
Solution Approach 1:
The patent changes the elastic property parameter by using moderate elastic yarns with controlled elasticity rather than highly elastic yarns. The fabric achieves sufficient extensibility (15-25%) through structural design and moderate elasticity, preventing excessive rebound force that would cause constriction while maintaining adequate conformability
Solution Approach 2:
The patent applies local quality by incorporating elastic yarns selectively in specific knit columns rather than uniformly throughout the fabric. This localized approach provides extensibility where needed for conformability while limiting overall elasticity to prevent constriction, resolving the contradiction between extensibility and constriction risk
4Measurement precision
If fiberglass backing is used, then x-ray transparency is improved, but knit structure visibility interferes with fracture detail
Solution Approach 1:
The patent changes the material composition parameter from fiberglass to polyester-rayon blend, and modifies the knit structure to create smoother surfaces. This parameter change maintains adequate x-ray transparency while reducing the visibility of knit structures, allowing better observation of fracture details through the cast
5Object-generated harmful factors
If nonfiberglass backing materials are used, then dust generation is reduced, but extensibility and conformability are limited
Solution Approach 1:
The patent uses a composite fiber blend of polyester and rayon with specific proportions (70-90% polyester, 10-30% rayon). This composite material approach maintains the dust-free advantage of nonfiberglass materials while achieving improved extensibility through the synergistic properties of the fiber blend and optimized knit structure
Solution Approach 2:
The patent changes the fabric structural parameters including knit pattern, loop formation, and columnar structure design. These parameter changes enable the nonfiberglass composite material to achieve extensibility of 15-25%, resolving the contradiction between dust reduction and extensibility limitation
Data Source
AI summary
The invention relates to a knit fabric for orthopedic support material. The knit fabric comprises in the weft yarn in-lay/cross direction synthetic organic microdenier yarn of no greater than 1.5 denier per filament (dpf) and synthetic organic multi-filament yarn of greater than 2.5 denier per filament (dpf). It is impregnated with a curable resin which on activation with a curing agent forms a cast supporting the patient's limb. The knit fabric according to invention exhibits the high holding capacity of the resin over time, said capacity being sufficient to prevent resin leak from a resin-coated fabric.