Alginate Wound Dressing Spraying CMC to Reduce Adherence
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Solution Overview
Problem
Existing alginate wound dressings face challenges in reducing adherence to wounds while being cost-effective and simple to manufacture, as current methods like blending or co-spinning with carboxymethylcellulose are either costly or environmentally harmful.
Innovation Solution
Incorporating polysaccharides like carboxymethylcellulose into alginate fibers by spraying a solution onto wet fibers post-extrusion, allowing for selective deposition and reducing the need for harsh reagents, thus simplifying the manufacturing process and enhancing absorbency without increasing adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If alginate fibers are used in wound dressings, then liquid absorption is improved, but adherence to wound tissue increases
Solution Approach 1:
The patent combines alginate fibers with carboxymethylcellulose (CMC) to create a composite material that leverages the liquid absorption properties of alginate while the CMC component reduces adherence to wound tissue. This composite approach allows the dressing to maintain high absorbency without the harmful adherent effect of pure alginate.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the alginate fibers by treating them with CMC solution, changing the surface properties and interaction characteristics of the fibers. This parameter change enables the fibers to maintain liquid absorption while reducing tissue adherence.
2Object-generated harmful factors
If carboxymethylcellulose is blended or co-spun with alginate fibers, then adherence is reduced, but manufacturing cost and complexity increase
Solution Approach 1:
The patent applies carboxymethylcellulose to the alginate fibers after they are already formed and extruded. This preliminary action of treating pre-formed fibers with CMC solution is simpler than integrating CMC into the fiber formation process itself, avoiding the need for complex co-spinning equipment or multi-stage manufacturing.
Solution Approach 2:
The patent separates the manufacturing process into distinct stages: first producing pure alginate fibers through extrusion, then separately applying carboxymethylcellulose treatment. This segmentation of the manufacturing process simplifies each individual step compared to integrated co-spinning or blending methods.
3Reliability
If carboxymethylcellulose is used to reduce adherence, then wound healing is improved, but environmental impact increases due to harsh reagents
Solution Approach 1:
The patent uses carboxymethylcellulose, a biodegradable polysaccharide derived from renewable resources, which decomposes naturally in the environment. This replaces harsh synthetic reagents with a environmentally benign material that maintains wound healing effectiveness while eliminating harmful environmental impacts.
Solution Approach 2:
The patent changes the chemical composition parameter by using carboxymethylcellulose instead of traditional harsh reagents. This parameter change maintains the functional benefit of reduced adherence and improved wound healing while eliminating the harmful environmental effects associated with conventional reagents.
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
This method reduces the cost and environmental impact of manufacturing while improving absorbency and reducing adherence to wounds, allowing for selective application patterns that enhance medication delivery and wound healing.
Implementation Method 1
spraying a solution comprising a polysaccharide onto the wet fibers
Implementation Method 2
Incorporating polysaccharides like carboxymethylcellulose into alginate fibers by spraying a solution onto wet fibers
Implementation Method 3
The solution is then extruded into a bath where an insoluble form of the alginate precipitates
Implementation Method 4
a solution comprising a soluble alginate polymer made from various mannuronic and gulurnic residues of the seaweed. The solution is then extruded into a bath where an insoluble form of the alginate precipitates
Implementation Method 5
Alginates are a useful substitute for gauze due to their ability to absorb liquids in a less adherent manner than gauze dressings
Implementation Method 6
wounds are to be kept generally dry to facilitate healing
Data Source
AI summary
A method (400) of manufacturing a wound dressing includes obtaining alginate fibers (108) and the step (404) of spraying either the alginate fibers (108) or a dressing or dressing layer (610) of the alginate fibers with an aqueous solution (801) comprising a polysaccharide, which can be carboxymethylcellulose. The step of spraying can occur while the alginate fibers, dressing, or dressing layer are wet. A step (405) of flash drying can follow to remove the solute of the aqueous solution to leave the polysaccharide along the alginate. The step of spraying can be selective, such that only portions of the dressing layer include the polysaccharide.