Composite Wound Dressing Channels Fluid Flow
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Solution Overview
Problem
Existing wound dressings face challenges in fluid management due to interfaces between layers, which hinder fluid flow from the wound to the absorbent foam layer, leading to insufficient fluid transfer and potential skin maceration, especially when hydrophilic fibers swell and block fluid paths.
Innovation Solution
A composite material with a first layer of absorbent fiber material and a second layer of absorbent material, where channels extending through the entire first layer and into the second layer facilitate fluid transport across interfacial areas, enhancing fluid management capabilities by providing a continuous fluid path and reducing the risk of leakage and skin maceration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple layers are laminated together to optimize liquid handling capacity, then fluid absorption and retention capabilities are improved, but fluid flow is hindered at the interfaces between layers
Solution Approach 1:
The first layer is segmented to include a plurality of channels that divide and guide fluid flow from the first side to the second side. These channels create dedicated fluid transport pathways that prevent interface hindrance, allowing fluid to move efficiently through the layered structure while maintaining high absorption capacity in the second layer.
Solution Approach 2:
The channels act as intermediary structures between the first layer (fiber material) and second layer (absorbent material). They provide a continuous fluid transport pathway that mediates the interface problem, enabling fluid to transition smoothly from one layer to another without being blocked by the lamination interface.
2Quantity of substance
If hydrophilic fibers are used to absorb wound fluid, then fluid uptake capacity is improved, but fiber swelling blocks internal channels and hinders fluid flow
Solution Approach 1:
The first layer is segmented into regions with channels that provide dedicated fluid transport pathways. These channels are structurally separated from the fiber matrix, so when hydrophilic fibers swell and absorb fluid, they do not block the channels. The channels maintain open pathways for fluid flow while fibers perform absorption.
Solution Approach 2:
Different regions of the first layer have different functions: the channel regions provide fluid transport pathways with larger void spaces that resist swelling, while the fiber-rich regions provide fluid uptake capacity. This local differentiation allows simultaneous optimization of both fluid absorption and fluid flow.
3Strength
If adhesive layers are added to bond layers together, then structural integrity is improved, but fluid flow is further limited at interfaces
Solution Approach 1:
The channels are nested within the first layer structure, extending through the entire layer and into the second layer. This nesting ensures that the fluid transport pathways are embedded within the bonded structure, maintaining fluid flow capability even when adhesive layers are present at the interfaces between layers.
Solution Approach 2:
The channels serve as intermediary structures that span across the adhesive interfaces. By providing continuous pathways through the bonded layers, they mediate the fluid transport function despite the presence of adhesive barriers, allowing fluid to flow through the entire multi-layer structure.
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 composite material effectively transports fluid from the wound to the absorbent layer, improving fluid retention and reducing the risk of leakage and skin maceration, as demonstrated by increased fluid distribution and absorption capacity in tests.
Implementation Method 1
a plurality of channels extends through the entire first layer, from said first side to said second side thereof, and further extends into at least a portion of said second layer
Implementation Method 2
hydrophilic fibers as used in the ultimate vicinity of the wound have the capacity to take up large amounts of fluid so that the fibers ultimately form a hydrogel and swell
Implementation Method 3
the fibers ultimately form a hydrogel and swell to the extent that internal channels and void structures used to lead fluid away from the wound may be partially or fully blocked
Data Source
Figure 1
Figure 2a~2d
Figure 3
AI summary
The present invention relates to a composite material(and its manufacture)which composite comprises(i)a first layer comprising an absorbent fiber material that is in contact with the area of use on its first side, (ii) a second layer comprising an absorbent material, said second layer being arranged on the second side of said first layer, wherein a plurality of channels extends through the entire first layer, from said first side to said second side thereof, and further extends into at least a portion of said second layer. This composite is of particular use in wound treatment.