Asymmetric Absorbent Core for Negative Pressure Wound Therapy
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Solution Overview
Problem
Reduced-pressure wound therapy systems face challenges with absorbent material loss and inefficient absorption, which hinder the effectiveness of providing reduced pressure to tissue sites.
Innovation Solution
A dressing system with an asymmetric absorbent core, featuring a pouch with an upstream layer and a downstream layer of different thicknesses and hydrophilic/hydrophobic properties, encloses an absorbent member to minimize material loss and enhance fluid distribution and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a conventional absorbent dressing is used in reduced-pressure wound therapy, then the dressing can absorb wound exudate, but absorbent material is lost and absorption efficiency is reduced
Solution Approach 1:
The patent applies asymmetry by configuring the absorbent core with different layer thicknesses - a first layer with thickness of 1-3 mm and a second layer with thickness of 3-6 mm. This asymmetric structure optimizes fluid distribution and retention, preventing absorbent material loss while maintaining high absorption efficiency throughout the dressing lifecycle
Solution Approach 2:
The patent implements local quality by creating regions with different absorbent properties within the core. The asymmetric layering provides varying absorption characteristics at different locations, with the thicker second layer providing enhanced absorption capacity where needed, thereby improving overall reliability and preventing material loss
2Productivity
If reduced-pressure therapy is applied to accelerate wound healing, then tissue growth is enhanced, but the cost and complexity of the system increases
Solution Approach 1:
The patent applies segmentation by dividing the absorbent core into distinct layered regions with different thicknesses and properties. This segmented structure allows each layer to perform specific functions optimally, enabling effective wound healing through reduced-pressure therapy while simplifying the overall system design and reducing complexity
3Ease of manufacture
If the absorbent core uses uniform thickness layers, then manufacturing is simpler, but fluid distribution and absorption efficiency are reduced
Solution Approach 1:
The patent resolves this contradiction by implementing asymmetric layer thicknesses (first layer: 1-3 mm, second layer: 3-6 mm) that optimize fluid distribution and absorption efficiency. The asymmetric design maintains manufacturability while significantly improving reliability through enhanced fluid management capabilities
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 system improves fluid management and absorbent material efficiency, reducing the frequency of dressing changes and lowering costs while maintaining therapeutic benefits by evenly distributing reduced pressure and fluids to the tissue site.
Implementation Method 1
The pouch may include an upstream layer having a first thickness, a hydrophilic side, and a hydrophobic side, and a downstream layer having a second thickness, a hydrophilic side, and a hydrophobic side
Implementation Method 2
an absorbent member enclosed between the upstream layer and the downstream layer
Data Source
AI summary
Systems, methods, and apparatuses for treating a tissue site with reduced pressure are described. The system includes a manifold configured to be placed adjacent the tissue site, and a sealing member configured to be placed over the tissue site and the manifold. The system also includes a reduced-pressure source fluidly coupled to the manifold through the sealing member. The system further includes a pouch having an upstream layer having a first thickness, a downstream layer having a second thickness, and an absorbent member enclosed between the upstream layer and the downstream layer. The second thickness is greater than the first thickness. The upstream layer may have a hydrophilic side adjacent the absorbent member, and the downstream layer may have a hydrophobic side adjacent the absorbent member.