Zwitterionic Polyurethane for Anti-Fouling Biomedical Devices
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Solution Overview
Problem
Current polyurethane (PU) materials face challenges such as unsatisfactory anti-fouling properties in complex biological media, inability to conjugate other moieties, and susceptibility to biofilm formation, which limits their effectiveness in medical applications.
Innovation Solution
The development of polymers with a polymer backbone that includes a zwitterionic precursor monomeric unit, which incorporates a secondary or tertiary amine, providing anti-fouling and antimicrobial properties while maintaining tunable mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyethylene glycol (PEG) is incorporated into PU for anti-fouling purposes, then anti-fouling properties are improved, but foreign body response, infection, and thrombosis remain unsolved
Solution Approach 1:
The patent changes the chemical parameters of the anti-fouling moiety from PEG to zwitterionic groups (carboxybetaine or sulfobetaine), which fundamentally alters the surface chemistry to provide both anti-fouling properties and biocompatibility. This parameter change resolves the contradiction by selecting a chemical structure that simultaneously achieves protein resistance and reduced foreign body response.
Solution Approach 2:
The patent creates a composite material system combining polyurethane backbone with zwitterionic side chains (carboxybetaine or sulfobetaine). This composite structure integrates the mechanical properties of PU with the anti-fouling and biocompatible properties of zwitterionic groups, resolving the contradiction between anti-fouling performance and biocompatibility.
2Duration of action of moving object
If hydrophobic degradable moieties (PCL or PLA) are incorporated into PU, then degradability is improved, but protein adsorption increases because degradation rate is slower than blood adsorption rate
Solution Approach 1:
The patent changes the chemical nature of the degradable moiety from hydrophobic (PCL/PLA) to hydrophilic zwitterionic groups with terminal carboxylic acid or sulfonic acid functionality. This parameter change enables faster degradation rates that exceed protein adsorption rates, while simultaneously providing anti-fouling properties through the zwitterionic surface chemistry.
3Object-affected harmful factors
If zwitterionic side chains are conjugated onto polyurethane backbones, then anti-fouling properties are improved, but the synthesis requires strong base (sodium hydroxide) as hydrolysis agent
Solution Approach 1:
The patent performs preliminary action by incorporating the zwitterionic precursor groups (with protected carboxylic acid or sulfonic acid functionality) directly into the polyurethane synthesis process. This allows the zwitterionic polyurethane to be formed in one step without requiring subsequent strong base hydrolysis, thereby simplifying the manufacturing process while maintaining anti-fouling properties.
4Object-affected harmful factors
If PU-based coatings are applied, then bacterial attachment is slightly reduced, but long-term biofilm formation resistance is insufficient
Solution Approach 1:
The patent creates a thin film coating on medical devices comprising zwitterionic polyurethane. This flexible thin film provides continuous anti-fouling and antimicrobial protection, effectively resisting both initial bacterial attachment and long-term biofilm formation. The coating maintains its protective function over extended periods, resolving the contradiction between reducing bacterial attachment and providing sustained biofilm resistance.
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 resulting polymers exhibit enhanced anti-fouling and antimicrobial properties, reduced protein adsorption, and resistance to bacterial attachment and biofilm formation, making them suitable for biomedical applications.
Implementation Method 1
Compared to PEG-based surfaces, zwitterionic materials can form strong hydration layer via ionic solvation to resist foulants
Implementation Method 2
a zwitterionic precursor monomeric unit, wherein the zwitterionic precursor monomeric unit includes a secondary or a tertiary amine within the polymer backbone
Data Source
AI summary
Provided herein are polymers having a polymer backbone including a zwitterionic precursor monomeric unit having a secondary or tertiary amine in the polymer backbone, as well as methods of making and using the same.