Foam Laminate Dressing for NPWT Absorption and Seal
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Solution Overview
Problem
Current wound dressings used in negative pressure wound therapy lack an effective combination of absorptive and sealing properties, with hydrophobic foams not absorbing water and hydrophilic foams having poor physical strength and high density.
Innovation Solution
A foam laminate comprising a distinct hydrophobic reticulated foam layer and a hydrophilic foam layer bonded together, with the hydrophobic layer providing a hermetic seal and even vacuum distribution, and the hydrophilic layer offering excellent absorbency, and the laminate is spiral cut for easy sizing to fit wounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrophilic polyurethane foam is used for wound dressings, then absorptive ability is improved, but physical strength deteriorates and density increases
Solution Approach 1:
The patent combines hydrophobic polyurethane foam and hydrophilic polyurethane foam into a composite laminate structure. The hydrophobic layer provides mechanical strength and structural integrity, while the hydrophilic layer provides absorptive capacity for wound exudate. This composite approach resolves the contradiction by distributing functions across different material layers.
2Strength
If conventional reticulated polyurethane foam is used, then physical strength and cost-effectiveness are improved, but water absorption capability deteriorates
Solution Approach 1:
The laminate combines hydrophobic reticulated polyurethane foam (providing strength and structure) with hydrophilic polyurethane foam (providing water absorption). This composite structure allows the dressing to maintain mechanical integrity while achieving the necessary absorptive capacity for wound care applications.
3Quantity of substance
If hydrophilic polyurethane foam is used, then water compatibility and absorption are improved, but cost per unit volume increases
Solution Approach 1:
The laminate structure combines expensive hydrophilic foam (for absorption) with cost-effective hydrophobic foam (for structure). This composite approach optimizes cost by using the hydrophilic material only where absorption is needed, rather than throughout the entire dressing structure.
4Device complexity
If a single-layer foam dressing is used, then device complexity is reduced, but functional performance deteriorates
Solution Approach 1:
The laminate combines hydrophobic and hydrophilic foam layers in a multi-layer structure where each layer performs a specific function. The hydrophobic layer provides structural support and fluid distribution, while the hydrophilic layer provides absorption. This functional specialization improves overall performance despite increased structural 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 laminate enhances wound healing by providing superior absorbency and sealing, promoting even vacuum distribution and improved wound care through the combination of hydrophobic and hydrophilic foam layers, while the hydrophobic layer ensures a secure seal and the hydrophilic layer aids in fluid management.
Implementation Method 1
the hydrophilic layer provides for excellent absorptive features in the treatment of the wound
Implementation Method 2
Hydrophilic polyurethanes are compatible with water and absorb water
Implementation Method 3
The reticulated hydrophobic layer enables an even distribution of vacuum over the dressing
Implementation Method 4
a hermetic sealing layer that surrounds the dressing and seals to the skin about the wound
Implementation Method 5
negative pressure wound therapy device
Data Source
AI summary
A foam laminate dressing includes a first distinct hydrophobic reticulated foam layer and an underlying second distinct hydrophilic layer bonded to the first layer and of substantially same length and width as the first distinct hydrophobic reticulated foam layer.