Crosslinked Hydrogel Dressing with Porous Microspheres
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Solution Overview
Problem
Current wound dressings for chronic and burn wounds face challenges in maintaining a moist environment, absorbing exudates without desiccating the wound, and providing mechanical stability, while also avoiding residue left in the wound bed and issues with fibrous alginate dressings such as handling difficulties and structural weakness.
Innovation Solution
A crosslinked absorbent hydrogel matrix incorporating porous, absorbent microspheres made from biocompatible polymers, which can be the same or different from the hydrogel matrix, optionally including a plasticizer, to create a dressing that maintains moisture, absorbs excess fluids, and promotes autolytic debridement without disintegrating or adhering to the wound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel dressings are used to maintain a moist wound environment, then autolytic debridement is promoted, but the dressings may dissolve into the wound bed
Solution Approach 1:
The patent combines hydrogel with crosslinked polymer networks to create a composite dressing material that maintains the moisture-retaining properties of hydrogel while adding structural stability through crosslinking, preventing dissolution into the wound bed
Solution Approach 2:
The patent modifies the chemical structure of the hydrogel by introducing crosslinks between polymer chains, changing the physical parameters of the material to achieve both moisture retention and structural integrity simultaneously
2Quantity of substance
If fibrous alginate dressings are used for absorption, then exudate management is improved, but handling difficulties and structural weakness occur
Solution Approach 1:
The patent employs porous non-fibrous alginate structure that provides high exudate absorption capacity through capillary action in the porous network, while eliminating the handling difficulties associated with fibrous structures
Solution Approach 2:
The patent changes the physical form of alginate from fibrous to non-fibrous porous structure, altering the material parameters to improve both absorption capability and handling characteristics
3Loss of substance
If mechanical debridement with wet-to-dry dressing is used, then necrotic tissue removal is achieved, but pain and damage to granulation tissue occur
Solution Approach 1:
The patent enables the wound to debride itself by maintaining a moist environment that allows endogenous enzymes to dissolve necrotic tissue, eliminating the need for mechanical removal that causes pain and damage
Solution Approach 2:
The patent replaces mechanical debridement methods with a biochemical process by using hydrogel to create conditions for enzymatic dissolution of necrotic tissue, substituting mechanical force with chemical action
4Productivity
If surgical debridement is used for quick necrotic tissue removal, then debridement efficiency is improved, but bleeding and pain are caused
Solution Approach 1:
The patent allows the wound to perform its own debridement function over time through maintained moisture and endogenous enzymatic activity, avoiding the need for surgical intervention that causes bleeding and pain
Solution Approach 2:
The patent prepares the wound environment in advance by applying hydrogel dressing that maintains moisture and activates autolytic processes, enabling gradual debridement before surgical intervention would be needed
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 dressing effectively maintains a moist environment, absorbs excess fluids, softens necrotic tissue, and promotes healing by reducing dehydration rates and improving mechanical properties, allowing for easy application and removal without damaging the wound or dressing, while preventing infection and promoting autolytic debridement.
Implementation Method 1
a crosslinked absorbent hydrogel matrix that includes a biocompatible polymer
Implementation Method 2
Hydrogels are similar to hydrocolloids in the ability to absorb and manage wound exudate
Implementation Method 3
a plurality of porous absorbent microspheres encapsulated in the crosslinked absorbent hydrogel matrix
Implementation Method 4
Foam dressings are typically manufactured from synthetic polymeric materials, such as hydrophilic polyurethane, which absorb wound exudate by a sponge-type mechanism
Implementation Method 5
a crosslinked absorbent hydrogel matrix that includes a biocompatible polymer
Implementation Method 6
In autolytic debridement, the wound is kept very wet with dressings (hydrogels and hydrocolloids in relatively dry wounds) to soften the necrotic tissue
Data Source
AI summary
Wound dressings, methods for forming the wound dressings, and methods for using the wound dressings are described. Wound dressings include a crosslinked hydrogel matrix and a plurality of porous absorbent microspheres encapsulated in the crosslinked matrix. The hydrogel matrix and the microspheres can include the same or different hydrogel polymers, e.g., alginates or the like. The wound dressings can be used in treating chronic wounds and burn wounds and can promote autolytic debridement.