Chitosan Wound Dressing Gel Formation Absorption
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Solution Overview
Problem
Existing wound care devices, particularly fibre dressings, face issues with insufficient absorption and lack of cohesion, leading to inadequate fluid management and difficulty in removing the dressing from wounds without causing trauma.
Innovation Solution
A wound care device comprising chitosan or partially de-acetylated chitin combined with an acidic substance, which does not gel initially but forms a gel when exposed to fluids, is treated with ethylene oxide to enhance absorbency and structural integrity, allowing for improved fluid retention and ease of removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fibre dressings are used to treat wounds, then they can provide basic wound coverage, but they suffer from insufficient absorption of bodily fluids and lack of cohesion
Solution Approach 1:
The invention combines chitosan fibres with gel-forming materials to create a composite dressing structure. The chitosan fibres provide the fibrous network while the gel-forming materials (such as carboxymethyl cellulose, sodium alginate, or hydroxyethyl cellulose) provide both enhanced absorption capacity and cohesive binding, resolving the contradiction between absorption and structural integrity.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the dressing materials by treating chitosan fibres with acids to convert them into water-swelling and water-gelling forms, and by controlling the degree of de-acetylation of chitin. These parameter changes enable the materials to transition from non-gelling to gel-forming states, simultaneously improving absorption and cohesion.
2Strength
If gel-based dressings are used to treat wounds, then they provide cohesive structure and ease of removal, but they may have reduced absorbency compared to fibre dressings
Solution Approach 1:
The invention creates a composite structure combining fibrous materials (chitosan or chitin-based fibres) with gel-forming materials. This composite approach allows the dressing to maintain the cohesive, non-sticking properties of gel-based dressings while incorporating the high absorption capacity of fibrous structures, thus resolving the contradiction between cohesion and absorbency.
3Quantity of substance
If chitosan fibres are treated with acid and heat to convert them into water-swelling and water-gelling form, then they gain absorption capability, but the manufacturing process becomes more complex
Solution Approach 1:
The invention performs the acid treatment and conversion of chitosan fibres into water-swelling and water-gelling forms during the manufacturing process itself, rather than requiring post-manufacturing treatment. This preliminary action integrates the functional modification into the production workflow, maintaining ease of manufacture while achieving the desired absorption properties.
4Reliability
If the dressing is designed to gel when exposed to fluid, then it provides improved absorption and structural integrity, but it requires specific conditions (presence of acidic substance) to activate the gelling
Solution Approach 1:
The invention incorporates acidic substances (such as lactic acid, acetic acid, or citric acid) directly into the dressing structure, associated with the gel-forming material. When the dressing contacts wound exudate or bodily fluids, the acidic substance is released and automatically triggers the gelling reaction without requiring external activation. This self-service mechanism ensures reliable structural integrity while minimizing device complexity.
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 device demonstrates increased absorbency and structural integrity over time, effectively managing wound fluids and facilitating easy removal without causing pain or trauma, while also being sterile and environmentally friendly.
Implementation Method 1
a first material which does not substantially gel when exposed to a fluid but does gel when brought together with an acidic substance and exposed to a fluid
Implementation Method 2
capable of absorbing liquid to form a swollen coherent gel
Implementation Method 3
The wound care device demonstrates increased absorbency, making it more adept to absorb fluids that a wound care device would typically come into contact with
Implementation Method 4
exposing the intermediate device to ethylene oxide
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a wound care device, and more specifically to an absorbent wound care device and a method for making the same. The wound care device is obtainable by bringing together a first material and an acidic substance to form an intermediate device, which first material does not substantially gel when exposed to a fluid but does gel when brought together with an acidic substance and exposed to a fluid, and exposing the intermediate device to ethylene oxide.