Antimicrobial Straw Structure for Surface Contamination Control
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Solution Overview
Problem
Conventional fluid conveying conduits, such as drinking straws and medical tubing, are prone to contamination with microorganisms, which can be transferred to users and surfaces, posing infection risks due to their exposure and handling.
Innovation Solution
A polymeric tubular conduit design featuring an outer tubular layer with an antimicrobial agent that inhibits the growth or kills microorganisms on its surface, formed by co-extruding a polymeric material with the antimicrobial agent, providing a continuous tubular passage along the conduit length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluid conveying conduits are used, then the conduits are simple and inexpensive to manufacture, but they become contaminated with microorganisms that can be transferred to users and surfaces
Solution Approach 1:
The conduit is constructed with a composite structure consisting of an inner layer and an outer layer, where the outer layer contains antimicrobial agents dispersed within the polymeric material. This composite structure provides both the mechanical functionality of fluid conveyance and the antimicrobial protection needed to prevent contamination, resolving the contradiction between hygiene and structural simplicity.
2Reliability
If the conduit wall is made thicker to provide better antimicrobial protection, then microbial contamination is reduced, but the conduit becomes more complex and potentially more expensive to manufacture
Solution Approach 1:
The antimicrobial protection is localized to the outer surface of the conduit where microorganisms contact the conduit. The outer layer is specifically formulated with antimicrobial agents at concentrations effective for preventing contamination, while the inner layer maintains standard composition for fluid compatibility. This localized approach provides targeted protection without requiring uniform thickening of the entire conduit wall.
Solution Approach 2:
The multi-layer composite structure allows each layer to be optimized for its specific function: the inner layer for fluid compatibility and the outer layer for antimicrobial protection. This division of functions within the composite structure achieves effective microbial protection without requiring excessive wall thickness, thereby avoiding unnecessary complexity and manufacturing costs.
3Ease of manufacture
If a single-layer conduit with antimicrobial agent is used, then the manufacturing process is simpler, but the antimicrobial agent may not be uniformly distributed
Solution Approach 1:
The conduit manufacturing process is segmented into separate steps for forming the inner layer and outer layer. The antimicrobial agents are incorporated into the outer layer material before extrusion, allowing for controlled and uniform distribution within that specific layer. This segmentation of the manufacturing process into distinct layer-forming steps ensures consistent antimicrobial agent distribution while maintaining a relatively simple overall manufacturing approach.
Solution Approach 2:
By using a composite multi-layer structure, the antimicrobial agents are concentrated in the outer layer where they are most needed, rather than attempting to distribute them uniformly throughout the entire conduit wall. This composite approach achieves precise antimicrobial agent placement in the critical surface region, improving manufacturing precision for antimicrobial functionality while keeping the manufacturing process manageable.
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 antimicrobial agent effectively reduces microbial contamination by 99.999% on the conduit surfaces, preventing the transfer of pathogens and maintaining hygiene.
Implementation Method 1
the outer tubular layer includes an amount of antimicrobial agent. The amount of antimicrobial agent can be sufficient to kill or inhibit growth of microorganisms in contact with a polymeric tubular conduit wall external surface
Data Source
AI summary
A polymeric tubular conduit including a polymeric tubular conduit wall having an outer tubular layer coaxially overlaying an inner tubular layer which defines a continuous tubular passage along a polymeric tubular conduit length of the polymeric tubular conduit; whereby the outer tubular layer, the inner tubular layer, or combinations thereof, include an amount of antimicrobial agent. The amount of antimicrobial agent can be sufficient to kill or inhibit growth of microorganisms in contact with a corresponding polymeric tubular conduit wall external surface, polymeric tubular conduit wall internal surface, or combinations thereof, of the polymeric tubular conduit wall.