Orthopedic Liner Segmented Layers for Friction and Breathability
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Solution Overview
Problem
Existing liners for orthopedic and prosthetic devices face challenges in balancing vapor permeability and frictional characteristics while being cost-effective and simple to manufacture, often compromising on breathability, compressibility, and padding.
Innovation Solution
A liner structure comprising a compressible core and a polymeric or polyurethane emulsion second layer with enhanced frictional properties, featuring a fine porous structure for vapor transmission and compressible thickness for padding, along with optional additional layers and a mesh interface to prevent separation and maintain breathability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liner uses traditional materials to provide frictional characteristics, then frictional resistance is improved, but vapor permeability deteriorates
Solution Approach 1:
The liner is divided into multiple functional layers: a first layer providing frictional resistance, a second layer providing vapor permeability and breathability, and a third layer providing structural support and compressibility. This segmentation allows each layer to optimize its specific function without compromising the others, resolving the contradiction between frictional resistance and vapor permeability.
Solution Approach 2:
The liner uses composite material construction combining different materials with complementary properties. The first layer uses materials with high frictional resistance, the second layer uses porous breathable materials, and the third layer uses supportive materials. This composite approach enables simultaneous achievement of frictional resistance and vapor permeability that cannot be obtained with a single material.
2Object-affected harmful factors
If a liner uses materials with high vapor permeability, then breathability is improved, but frictional characteristics deteriorate
Solution Approach 1:
By separating the frictional function into a dedicated first layer and the vapor permeability function into a dedicated second layer, the design allows each layer to be optimized for its specific purpose. The first layer can use materials with high frictional resistance while the second layer uses highly breathable materials, eliminating the need to compromise between these opposing requirements.
Solution Approach 2:
The composite structure combines materials with contrasting properties in specific layers. The first layer uses materials optimized for frictional resistance, while the second layer uses materials optimized for vapor permeability. This composite approach enables the liner to achieve both high frictional resistance and high vapor permeability simultaneously, resolving the contradiction between these two requirements.
3Ease of operation
If a liner provides sufficient padding and compressibility, then user comfort is improved, but structural integrity deteriorates
Solution Approach 1:
The liner structure segments the padding/compressibility function into a dedicated third layer that is distinct from the frictional and vapor permeability layers. This third layer can be optimized for compressibility and padding without compromising the structural integrity provided by the first and second layers, allowing sufficient padding while maintaining overall structural strength.
Solution Approach 2:
The composite material structure allows the third layer to use materials optimized for compressibility and padding, while the first and second layers provide structural integrity through their respective material properties. This composite approach enables the liner to achieve both sufficient padding for comfort and adequate structural integrity to maintain its shape and provide support.
4Reliability
If a liner uses complex multi-layer construction to achieve all desired characteristics, then performance is improved, but manufacturing complexity deteriorates
Solution Approach 1:
The liner is segmented into three distinct layers, each with a specific primary function. This segmentation simplifies the manufacturing process by allowing each layer to be produced and treated independently, then assembled together. The clear functional division makes it easier to select materials and optimize each layer without the complexity of trying to achieve all functions within a single layer or material.
Solution Approach 2:
While using composite materials, the design simplifies manufacturing by establishing clear boundaries between layers and defining specific primary functions for each. This approach makes material selection and assembly more straightforward compared to attempting to achieve all desired characteristics within a single complex material or layer structure.
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 liner provides improved frictional resistance, breathability, and customizable padding, allowing for tailored compressibility and enhanced user comfort while maintaining cost-effectiveness and ease of manufacturing.
Implementation Method 1
Both the core and the second layer enable a transfer of air and vapor through their combined thickness. The second layer has a fine porous structure enabling vapor transmission
Implementation Method 2
The core and the second layer are compressible, and the second layer preferably has enhanced frictional properties to inhibit sliding against a user's skin when sweat is present
Implementation Method 3
the second layer preferably has enhanced frictional properties to inhibit sliding against a user's skin when sweat is present
Data Source
AI summary
A liner for an orthopedic or prosthetic device includes a core formed from a porous and compressible material, a first layer secured to the first side of the core and forming a first surface to the liner, and a second layer secured to the second side of the core and forming a second surface to the liner. The first and second layers may comprise different properties from one another and be formed from different materials including fabrics and polymeric materials. A polymeric film may be secured to the core or one of the layers to define at least part of a surface of the liner.