Quaternary Polymeric Wound Dressings for Chronic Infection Control
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Solution Overview
Problem
Chronic wounds fail to heal due to bacterial colonization, necessitating wound dressings and topical formulations with broad-spectrum antimicrobial properties to control infection and promote healing.
Innovation Solution
Development of wound dressings and formulations containing polymeric components, such as quaternary ammonium polymers, which include polyethyleneimine intermediates with quaternized nitrogen atoms and reactive linking groups, to provide antibacterial properties against gram-negative and gram-positive bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wound dressings are used, then the wound can be covered and protected, but the dressings lack effective antimicrobial properties to control bacterial infection
Solution Approach 1:
The patent modifies the chemical structure of polyethyleneimine by quaternizing nitrogen atoms to introduce antimicrobial quaternary ammonium groups. This parameter change in molecular structure transforms the polymer from a non-antimicrobial state to an antimicrobial state, enabling it to effectively kill bacteria while maintaining wound dressing functionality
Solution Approach 2:
The invention creates a composite polymeric component combining polyethyleneimine with quaternary ammonium salts and crosslinkers. This composite structure integrates multiple functions: the polyethyleneimine provides film-forming and adhesive properties, while the quaternary ammonium groups provide broad-spectrum antimicrobial activity against both Gram-positive and Gram-negative bacteria
2Reliability
If existing topical formulations are applied, then the wound can be treated, but the formulations lack broad-spectrum antimicrobial activity to prevent infection
Solution Approach 1:
The patent changes the chemical parameters of the topical formulation by incorporating quaternized polyethyleneimine with specific molecular weight ranges (2,000 to 500,000) and controlled quaternization degrees (20-100%). These parameter adjustments optimize the formulation's antimicrobial efficacy while maintaining safety and compatibility with wound tissue
Solution Approach 2:
The quaternized polyethyleneimine formulation provides multiple functions simultaneously: it acts as an antimicrobial agent against diverse bacteria, a wound dressing component, and a protective barrier. This multi-functionality eliminates the need for separate antimicrobial treatments and simplifies the wound care regimen
3Productivity
If chronic wounds are left untreated with antimicrobial agents, then the natural healing process continues, but bacterial colonization impairs healing and extends treatment time
Solution Approach 1:
The patent applies preliminary anti-action by incorporating broad-spectrum antimicrobial polymeric components into the wound dressing that proactively prevent and eliminate bacterial colonization before bacteria can establish infection. This preliminary protection removes the harmful factor (bacteria) that would otherwise delay healing, allowing the natural healing process to proceed at optimal speed without interruption
Data Source
AI summary
Described herein are wound dressings and methods of their use, wherein the wound dressings comprise a polymeric component. The polymeric component is a polyethyleneimine intermediate selected from the group consisting of:at least one R60 is —(CH2)3OH but less than 50% of all R60 are —(CH2)3OH; and the polyethyleneimine intermediate has a ratio of total quaternary amines to total hydroxyl groups of at least 1:1.