PEG Prepolymer Wound Matrix for Irregular Wound Conformability
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Solution Overview
Problem
Traditional hydrogel slabs struggle to conform to irregularly-shaped wounds, lack an interconnected porous structure, and produce biocompatible degradation byproducts that hinder healing, while injectable dressings fail to match native tissue mechanical properties and require frequent changes, causing pain and infection risks.
Innovation Solution
A polyethylene glycol (PEG) prepolymer reaction product with a protease-degradable peptide, combined with a thiolated biomolecule, forms a polymeric matrix through instantaneous in situ polymerization without a light source, creating a biodegradable wound dressing that supports cell viability and promotes wound regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional hydrogel slabs are used, then they provide basic wound coverage, but they fail to conform to irregularly-shaped wounds and lack interconnected porous structure
Solution Approach 1:
The patent employs a two-part injectable system that transforms from liquid components to a solid hydrogel matrix in situ. The prepolymer solution and crosslinking agent are injected separately and then combined at the wound site, where they dynamically transition from flowable state to structured gel, adapting to any wound geometry before setting
Solution Approach 2:
The system utilizes changes in physical parameters (viscosity, crosslinking density, gelation time) to achieve conformability. The prepolymer maintains low viscosity for injection and spreading, then undergoes rapid crosslinking to lock the conformed shape, with parameters like crosslinking agent concentration and injection rate optimized for different wound types
2Shape
If injectable dressings from microparticles or crosslinkable systems are used, then they can be applied to irregular wounds, but they fail to match the mechanical properties of native tissue
Solution Approach 1:
The patent creates a composite hydrogel system combining PEG-based prepolymer with natural polymer crosslinking agents (collagen, gelatin, or hyaluronic acid). This composite structure integrates the biocompatibility and tissue-like mechanical properties of natural polymers with the structural integrity of synthetic PEG, achieving mechanical properties that match native tissue
Solution Approach 2:
The crosslinking density and polymer composition can be locally optimized within the hydrogel matrix. By controlling the ratio of prepolymer to crosslinking agent and using gradients in crosslinking density, the hydrogel can exhibit varying mechanical properties in different regions to match the heterogeneity of native tissue structures
3Duration of action of stationary object
If current degradable dressings are used, then they can be left in place throughout healing, but their degradation byproducts hinder the healing process
Solution Approach 1:
The patent selects degradation products (lactate from PEG and amino acids from peptide crosslinkers) that are naturally present in physiological systems and actively participate in healing processes. These byproducts are converted from potential harmful substances into beneficial components that support tissue regeneration and reduce inflammation
Solution Approach 2:
The hydrogel degradation is designed to occur through endogenous enzymes and physiological processes already present at the wound site. The system self-degrades without requiring external intervention, with the breakdown products naturally integrated into the wound healing environment, eliminating the need for removal procedures
4Speed
If photopolymerization is used for in situ polymerization, then rapid gel formation is achieved, but toxic photoinitiators are required
Solution Approach 1:
The patent removes the photoinitiator component entirely from the system, replacing photopolymerization with enzymatic or chemical crosslinking mechanisms. This extraction of the harmful element maintains the advantage of in situ gel formation while eliminating toxic residues, using alternative crosslinking pathways that do not require light-sensitive initiators
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 PEG prepolymer and thiolated biomolecule combination forms a biodegradable matrix that conforms to complex wound shapes, promotes healing, reduces scarring, and enhances neovascularization, while avoiding the need for frequent dressing changes and toxic photoinitiators.
Implementation Method 1
the thiolated biomolecule can crosslink acrylate side chains of the PEG prepolymer to form a polymeric matrix
Implementation Method 2
a reaction product of an amine-reactive PEG and a protease degradable peptide
Data Source
AI summary
A polyethylene glycol (PEG) prepolymer is disclosed herein. The PEG prepolymer comprises a reaction product of an amine-reactive PEG and a protease degradable peptide. The reaction product comprises the formula [Acryl-PEG-peptide-PEGAcryl]n, wherein n is greater than 0. The reaction product can be combined with a thiolated biomolecule. Matrices formed from the PEG prepolymer and the thiolated biomolecule are provided and uses thereof.