Prosthetic Liner Porous Layer Moisture Management
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Solution Overview
Problem
Prosthetic and orthopedic liners face challenges in managing perspiration, preventing slippage, and providing adequate cushioning, particularly due to frictionless gaps caused by perspiration buildup, leading to skin irritation and discomfort.
Innovation Solution
A liner design featuring a porous, three-dimensional woven synthetic material with a perforated inner layer and optional outer layer, incorporating silicone materials for structural support and moisture management, including tacky surfaces to prevent slippage and channels for perspiration to escape, thereby reducing friction and enhancing comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a liner is made from non-absorbent elastomer material to provide cushioning and protection, then the liner can maintain its structural integrity and cushioning properties, but perspiration build-up causes the liner to lose suspension and slip on the limb
Solution Approach 1:
The liner incorporates a porous layer made of hydrophilic material that allows perspiration to be absorbed and transported through the liner structure. The porous structure enables moisture management while maintaining the liner's cushioning properties, preventing the frictionless gap formation that causes slippage.
Solution Approach 2:
The liner uses a composite structure combining hydrophobic elastomer material for cushioning with hydrophilic porous material for moisture management. This composite approach allows the liner to simultaneously provide structural integrity and perspiration management, preventing slippage while maintaining cushioning capability.
2Strength
If the liner thickness is increased to provide additional cushioning between the limb and prosthesis, then comfort is improved, but the liner becomes more prone to slippage due to increased perspiration retention
Solution Approach 1:
The porous layer provides perspiration management pathways throughout the liner thickness, allowing moisture to be transported away from the limb even in thicker liner configurations. This prevents the accumulation of perspiration that would otherwise cause slippage and skin irritation in thicker liners.
Solution Approach 2:
The liner features different material properties at different locations - the inner surface contacting the limb has perspiration management properties to prevent slippage, while the outer surface provides cushioning and structural support. This local differentiation allows thick liners to provide cushioning without the slippage problems.
3Reliability
If a tacky inner surface is used to prevent liner slippage on the limb, then the liner stays firmly in place, but perspiration build-up creates a frictionless gap that reduces the effectiveness of the tacky surface
Solution Approach 1:
The porous layer is positioned at the inner surface to manage perspiration at the source, absorbing and transporting moisture away from the skin-liner interface. This prevents the formation of the frictionless perspiration film that would otherwise render the tacky surface ineffective, allowing the tacky surface to maintain its grip without causing skin irritation.
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 effectively manages perspiration, prevents slippage, and provides superior cushioning, reducing skin irritation and improving user comfort by directing moisture away from the skin and maintaining secure contact with the limb.
Implementation Method 1
the liner includes a porous layer... capable of absorbing perspiration formed by the limb and transporting the perspiration away from the limb
Implementation Method 2
The liner may include an inner layer made from a material having a tacky inner surface for contacting the skin of the limb
Data Source
AI summary
A liner is arranged for use in prosthetic and orthopedic devices. The liner defines first and second end portions, and inner and outer surfaces. The liner includes an inner layer having a frictional component and forms at least part of the periphery of the inner liner surface. The inner layer defines a plurality of apertures. A porous element is in communication with the inner liner surface and is connected to the inner layer such that the apertures permit a transfer of air from the inner surface to the porous element. A base layer adjoins the porous element and extends between the first and second end portions of the liner.