Microbicidal Composite Material with Porous 3D Structure
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Solution Overview
Problem
Conventional composite materials for wound healing face issues such as elution of microbicidal agents, leading to drug resistance in pathogens, inadequate oxygen supply, and anaerobic conditions, which hinder healing and increase the risk of infections.
Innovation Solution
A three-dimensional microbicidal composite material with differential stitch/thread densities and surface moieties for enhanced binding of microbicidal agents, allowing efficient air circulation and exudate wicking, preventing pathogen growth and drug resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microbicidal agents are incorporated into conventional composite materials, then microbicidal activity is achieved, but the agents elute and cause drug resistance in pathogens
Solution Approach 1:
The patent employs a three-dimensional composite material with controlled porosity that allows oxygen penetration while retaining microbicidal agents. The porous structure provides surface area for agent incorporation without enabling elution, as the agents are bound to the material matrix. This resolves the contradiction by maintaining microbicidal activity while preventing agent release that would cause resistance.
Solution Approach 2:
The invention uses a composite material system combining multiple components: a three-dimensional matrix, oxygen-permeable structures, and surface moieties for agent binding. This composite approach allows simultaneous achievement of microbicidal efficacy and prevention of agent elution, thereby avoiding drug resistance development while maintaining reliable antimicrobial protection.
2Reliability
If conventional composite materials are used for wound healing, then wound coverage is provided, but oxygen supply is inadequate and anaerobic conditions develop
Solution Approach 1:
The patent applies local quality by creating regions within the composite material with different properties: oxygen-permeable channels or pores are strategically incorporated to allow oxygen diffusion to the wound surface, while other regions provide structural support and retain microbicidal agents. This localized differentiation enables aerobic conditions at the wound interface while maintaining overall material integrity and healing support.
3Reliability
If microbicidal agents are bound to material surfaces, then pathogen growth is inhibited, but binding capacity is insufficient
Solution Approach 1:
The patent transitions from two-dimensional surface binding to three-dimensional agent distribution throughout the composite material matrix. By incorporating surface moieties distributed throughout the three-dimensional structure and utilizing the material's internal surface area, the system achieves significantly increased microbicidal agent capacity while maintaining effective pathogen inhibition. This dimensional expansion allows greater agent loading without compromising binding effectiveness.
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 material effectively kills pathogens, promotes wound healing by maintaining oxygen supply, and prevents drug resistance, allowing for extended use without frequent dressing changes, as demonstrated by significant reduction in microbial growth and wound contraction rates.
Implementation Method 1
each layer of the three dimensional structure has surface moieties chemically bound to a microbicidal agent in a non-eluting manner
Implementation Method 2
The third pre-defined stitch/thread density is less than the first pre-defined stitch/thread density and the second pre-defined stitch/thread density, to allow for wicking by capillary action on contact of at least one of the first layer and the second layer with the fluid
Implementation Method 3
each layer in the three dimensional structure has a plurality of apertures to allow for circulation of air through the microbicidal composite material
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
A composite material having inherent microbicidal activity is herewith described. The microbicidal composite material comprises of a first layer having a first predefined thickness and a first predefined stitch/thread density; a second layer having a second predefined thickness and a second predefined stitch/thread density; an intermediate layer having a third predefined thickness and a third predefined stitch/thread density, wherein the intermediate layer is sandwiched between the first layer and the second layer, and where the intermediate layer is connected to the first layer and the second layer to form a three dimensional structure, and where each layer in the three dimensional structure has a plurality of apertures. Further, at least one layer in the three dimensional structure comprises at least one of microfibers and nanofibres having augmented surface moieties, wherein the augmented surface moieties allow for binding of a microbicidal agent to impart the inherent microbicidal activity.