Thermoplastic Elastomer Microcratered Surface Friction Reduction
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Solution Overview
Problem
Existing thermoplastic elastomer compositions used in skin contact applications tend to rupture and crumble under shearing stress, causing discomfort due to friction and lack of lubrication, and do not provide sufficient surface characteristics for enhanced patient comfort and antimicrobial activity.
Innovation Solution
The development of thermoplastic elastomers with microcraters on their surface, formed by the precipitation of additives such as antioxidants and antimicrobial agents, which increase the surface area and provide improved lubricity and antimicrobial properties, reducing friction and enhancing skin contact comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional thermoplastic elastomer compositions are used, then the material provides basic elasticity and shape retention, but the surface characteristics cause high friction and discomfort during prolonged skin contact
Solution Approach 1:
The patent applies the porous materials principle by creating a microcratered surface topology on the thermoplastic elastomer. The precipitation of additives forms numerous microscopic pores and craters on the surface, which fundamentally changes the surface characteristics. These micro-porous structures reduce friction by distributing contact pressure and allowing slight deformation during skin contact, thereby improving comfort during prolonged wear.
Solution Approach 2:
The patent applies the local quality principle by creating non-uniform surface characteristics through selective additive precipitation. The microcraters are distributed across the surface but create localized variations in texture and properties. This local modification of surface quality allows the bulk material to maintain its elastic properties while the surface provides reduced friction and enhanced comfort.
2Reliability
If additives are incorporated into the elastomer composition, then antimicrobial and therapeutic properties are provided, but the additives may affect the structural integrity and cause rupture under shearing stress
Solution Approach 1:
The patent applies the parameter changes principle by carefully controlling the concentration and distribution of additives within the thermoplastic elastomer matrix. By optimizing the amount of additives and their precipitation characteristics, the patent achieves sufficient antimicrobial activity while maintaining the structural integrity needed to resist shearing stress. The controlled precipitation process ensures additives are distributed in a way that strengthens rather than weakens the material.
Solution Approach 2:
The patent applies the composite materials principle by creating a multi-phase structure where additives are dispersed within the thermoplastic elastomer matrix. This composite structure combines the base polymer providing mechanical strength and elasticity with functional additives providing antimicrobial and therapeutic properties. The microcrater formation creates a hierarchical composite structure that maintains overall material integrity while providing surface-level functional benefits.
3Quantity of substance
If the surface area is increased through microcrater formation, then more therapeutic agents can be incorporated and delivered, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies the self-service principle by utilizing the natural precipitation process of additives during the cooling phase of elastomer manufacturing. Rather than requiring additional processing steps to create microcraters or incorporate therapeutic agents, the system self-organizes into the desired microcratered structure as the additives precipitate from the melt during normal cooling. This eliminates the need for separate surface treatment or microstructure creation steps.
Solution Approach 2:
The patent applies the preliminary action principle by incorporating additives into the elastomer composition before manufacturing. The additives are pre-mixed into the polymer matrix at the appropriate concentration, positioned to precipitate during cooling. This preliminary incorporation ensures uniform distribution and proper concentration, allowing the microcrater formation to occur naturally during the standard manufacturing process without requiring post-processing steps.
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 microcratered surface of the thermoplastic elastomers enhances patient comfort by reducing friction and allowing prolonged skin contact, while also providing increased antimicrobial activity and wound healing benefits through the migration of therapeutic agents.
Implementation Method 1
the precipitation of additives, such as an antioxidant, an antimicrobial agent, and/or other additives
Implementation Method 2
which is melted then cooled into the thermoplastic elastomer
Data Source
AI summary
Thermoplastic elastomers may be manufactured by mixing together plasticizing oil, a triblock copolymer and one or more additives, e.g., an antioxidant, an antimicrobial agent, and/or other additives, to form a mixture which is melted then cooled into the thermoplastic elastomer. During cooling the thermoplastic elastomer may be molded or otherwise formed into any number of articles including, but not limited to, prosthetic liners, prosthetic sleeves, external breast prostheses, breast enhancement bladders, wound dressing sheets, wound dressing pads, socks, gloves, malleolus pads, metatarsal pads, shoe insoles, urinary catheters, vascular catheters and balloons for medical catheters both vascular as well as urinary.