Antimicrobial TPU with Covalent Guanidine Bonding
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Solution Overview
Problem
Current antimicrobial additives used in medical devices can elute from materials, leading to adverse health outcomes and interference with non-thrombogenic properties, and existing methods for achieving antimicrobial and non-fouling performance are costly, complex, and often ineffective in preventing bacterial infections.
Innovation Solution
Development of thermoplastic polyurethane (TPU) compositions with integrated antimicrobial and non-fouling additives, where deprotonated guanidine compounds are covalently bonded into the polymeric backbone, and zwitterionic or silicone-based additives are incorporated to prevent elution and maintain effective antimicrobial performance without interfering with non-thrombogenicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial additives are incorporated into polymeric materials to eliminate or reduce microbial growth, then antimicrobial effectiveness is improved, but the additives may elute from the material causing adverse health outcomes and interfering with non-thrombogenic properties
Solution Approach 1:
The patent combines antimicrobial and non-fouling properties into a single integrated polymer composition rather than using separate coatings or additives. The TPU composition incorporates both antimicrobial agents (silver ions, zinc ions, or copper ions) and non-thrombogenic properties through the inherent characteristics of the thermoplastic polyurethane matrix, eliminating the need for separate eluting antimicrobial coatings that cause adverse health outcomes.
Solution Approach 2:
The invention uses a composite material system where thermoplastic polyurethane serves as the base polymer combined with metallic ions (silver, zinc, or copper) providing antimicrobial activity. This composite approach allows the metallic ions to be integrated within the polymer matrix, preventing elution while maintaining antimicrobial effectiveness and non-thrombogenic properties simultaneously.
2Reliability
If coating methods are used to provide antimicrobial performance, then antimicrobial activity is achieved, but additional processing steps are required which add costs and may flake off resulting in adverse health outcomes
Solution Approach 1:
The patent merges the antimicrobial function directly into the base polymer material through compounding metallic ions into the TPU matrix during manufacturing. This eliminates the need for separate coating applications, reducing processing steps and costs while preventing the flaking issues associated with coating-based antimicrobial solutions.
Solution Approach 2:
The TPU composition provides self-contained antimicrobial protection through the integrated metallic ions within the polymer matrix. The material itself serves the antimicrobial function without requiring external coatings or additional processing steps, making the antimicrobial property an inherent characteristic of the material rather than an added layer.
3Reliability
If conventional antimicrobial compounds are used to prevent bacterial infections, then antimicrobial performance is improved, but they may interfere with non-thrombogenic properties required for blood contact applications
Solution Approach 1:
The invention uses a composite of thermoplastic polyurethane with metallic ions (silver, zinc, or copper) where the TPU matrix provides the non-thrombogenic property essential for blood contact applications, while the metallic ions provide antimicrobial protection. This composite structure allows both properties to coexist without interference, as the metallic ions are integrated within the biocompatible polymer matrix rather than forming separate eluting layers.
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 TPU compositions provide sustained antimicrobial activity without elution, reducing bacterial infections and thrombosis, while maintaining excellent physical properties and non-fouling characteristics, thus enhancing the safety and efficacy of medical devices.
Implementation Method 1
deprotonated guanidine compounds are covalently bonded into the polymeric backbone
Implementation Method 2
zwitterionic or silicone-based additives are incorporated to prevent elution and maintain effective antimicrobial performance without interfering with non-thrombogenicity
Data Source
AI summary
The disclosed technology provides thermoplastic polyurethane compositions having antimicrobial properties while still maintaining good physical properties and good non-fouling properties, methods of making the same, and articles, including medical devices, made from such compositions. The disclosed technology includes a process of making an antimicrobial polymer composition, where the process includes mixing an antimicrobial additive into a base polymer and further includes mixing in a non-fouling additive, where the antimicrobial additive is chemically held in the composition and the antimicrobial and non-fouling additives do not negatively impact each other's effectiveness.