Anionic Polymer-PHMB Wound Matrix for Sustained Antimicrobial Release
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Solution Overview
Problem
Wound dressings often contribute to increased incidence and persistence of bacterial infection in recalcitrant, non-healing and chronic wounds as they may entrap bacteria and provide a bacterial milieu over the course of treatment, with polyhexamethylene biguanide (PHMB) rapidly leaching from the product and leaving the wound vulnerable to colonization.
Innovation Solution
Anionic polymers are chemically interacted with PHMB to form a reversible electrostatic complex, anchoring the bactericidal agent within wound care products like dressings, gauze, or bandages, ensuring sustained release and preventing microbial colonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PHMB is incorporated into wound dressings to provide antimicrobial protection, then bacterial infection prevention is improved, but the agent rapidly leaches from the product leaving the wound vulnerable to colonization
Solution Approach 1:
The patent introduces an anionic polymer as an intermediary carrier that binds PHMB through electrostatic interactions. This mediator allows PHMB to be retained within the dressing matrix and released in a controlled manner, preventing both rapid leaching and complete depletion. The polymer acts as a reservoir that sustains PHMB availability throughout the dressing's intended use period.
Solution Approach 2:
The patent changes the physical-chemical state of PHMB by forming an electrostatic complex with an anionic polymer. This parameter change transforms PHMB from a free, rapidly-leaching state to a bound, controlled-release state. The electrostatic interaction modifies the release kinetics, enabling sustained protection while maintaining antimicrobial efficacy.
2Duration of action of stationary object
If PHMB is anchored within the product substrate to prevent leaching, then sustained protection is improved, but the agent may become depleted leaving the product vulnerable to colonization
Solution Approach 1:
The patent creates a dynamic equilibrium system where PHMB reversibly binds to and unbinds from the anionic polymer. This dynamic interaction ensures that PHMB is retained within the dressing during storage and initial application, then gradually released to maintain protective levels throughout the wearing period. The system adapts to prevent both premature depletion and excessive accumulation.
3Object-affected harmful factors
If wound dressings are used to cover wounds, then wound protection is improved, but the dressings may become colonized and impair healing through recurring reinfection
Solution Approach 1:
The patent applies preliminary action by pre-loading the dressing with an anionic polymer-PHMB complex before application. This ensures that antimicrobial protection is already established and sustained throughout the dressing's wear period, preventing bacterial colonization before it can occur. The controlled-release mechanism maintains protective PHMB levels throughout the intended use duration.
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 anionic polymer-bound PHMB effectively prevents bacterial colonization by releasing the agent upon bacterial influx, providing sustained antimicrobial protection for at least 1 to 60 days, achieving ≥4 log microbial reductions against various pathogens.
Implementation Method 1
anchoring the bactericidal agent through reversible electrostatic interactions
Implementation Method 2
The impermanent nature of these interactions allows for the agent to reversibly bind and unbind from the polymer in a concentration dependent manner
Data Source
AI summary
The invention provides for methods and compositions related to substrates used for wound care that incorporate bactericidal agents in a manner such that the agent can be anchored within the substrate, allowing for sustained protection from bacterial contamination and growth within said product throughout the duration of its usage.