Biodegradable Polyester Sutures with Antimicrobial Peptides
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Solution Overview
Problem
Conventional antibiotic treatments for medical devices, such as sutures and catheters, are ineffective due to low antibiotic concentrations at infection sites and the development of resistant bacterial strains, particularly with overused antibiotics like triclosan, which contributes to cross-resistance and biofilm formation, leading to persistent surgical site infections.
Innovation Solution
A biodegradable polyester formulation compounded with specific small antimicrobial peptides, such as those of formula (I) and (II), which provide controlled release and inhibit bacterial growth on the device surface and in the surrounding environment, reducing the risk of resistance development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antibiotics are used for medical devices, then initial antimicrobial effect is achieved, but bacterial resistance develops and treatment becomes ineffective
Solution Approach 1:
The patent changes the chemical parameters by switching from conventional antibiotics to antimicrobial peptides with specific amino acid compositions (formula I and II). These peptides have different mechanisms of action that prevent resistance development. The formulation also modifies concentration parameters through controlled release mechanisms, maintaining effective levels without the peak-trough fluctuations that promote resistance.
Solution Approach 2:
The invention creates a composite formulation combining biodegradable polyester with antimicrobial peptides. This composite material provides sustained release of the peptide while the polyester degrades, creating a multi-component system that maintains antimicrobial activity over time and prevents resistance through continuous exposure.
2Object-affected harmful factors
If triclosan is used in sutures, then surgical site infections are reduced, but cross-resistance to other antibiotics develops
Solution Approach 1:
The patent changes the chemical identity parameter by replacing triclosan with antimicrobial peptides of formula (I) and (II). These peptides have entirely different mechanisms of action compared to conventional antibiotics, eliminating cross-resistance. The peptides disrupt bacterial cell membranes through their amphipathic structure, a mechanism unrelated to traditional antibiotic targets.
3Quantity of substance
If antibiotics are released from medical devices, then local antimicrobial concentration is improved, but concentration gradients promote resistant strain selection
Solution Approach 1:
The patent implements a dynamic release system where the antimicrobial peptide is gradually released from the biodegradable polyester matrix. This creates a sustained, relatively uniform concentration over time rather than a static gradient. The biodegradation of the polyester controls the release rate, maintaining therapeutic levels without creating high-concentration zones that select for resistance.
Solution Approach 2:
The formulation provides continuous antimicrobial action through sustained peptide release from the polyester matrix. This continuous exposure prevents bacterial replication and resistance development, unlike intermittent or gradient-based release patterns that create windows of opportunity for resistant strains to emerge.
4Duration of action of moving object
If peptides are compounded into substrates for controlled release, then sustained antimicrobial effect is achieved, but peptide degradation occurs at processing temperatures
Solution Approach 1:
The patent uses a biodegradable polyester matrix as a protective shell or matrix that encapsulates the peptide. This matrix protects the peptide from thermal degradation during processing while allowing controlled release through its biodegradation. The polyester acts as a barrier that shields the sensitive peptide from harsh processing conditions.
Solution Approach 2:
The patent changes the processing parameters by using low-temperature compounding methods or rapid processing techniques that minimize thermal exposure of the peptide. The formulation parameters are optimized to allow peptide incorporation at temperatures that preserve peptide integrity while still enabling adequate mixing and coating.
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 formulation effectively inhibits bacterial growth and biofilm formation on medical devices, providing a sustained antimicrobial effect that exceeds the Minimum Inhibitory Concentration (MIC) for target bacteria, reducing the risk of infection and device colonization, while minimizing the likelihood of resistance development.
Implementation Method 1
The formulation effectively inhibits bacterial growth and biofilm formation on medical devices, providing a sustained antimicrobial effect that exceeds the Minimum Inhibitory Concentration (MIC) for target bacteria
Implementation Method 2
A biodegradable polyester formulation compounded with specific small antimicrobial peptides, such as those of formula (I) and (II), which provide controlled release
Data Source
AI summary
The present invention provides a formulation comprising a biodegradable polyester compounded with a compound of Formula (I): AA-AA-AA-X-Y. The invention further provides methods of making these formulations, medical devices such as sutures comprising said formulations and methods of making said devices.