Negative-Pressure Dressing Interface With Gradient Porosity Wear Layer
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Solution Overview
Problem
Existing negative-pressure therapy systems face challenges in providing effective long-term wear and compatibility with diverse tissue sites, including wounds and tissue growth promotion, while maintaining optimal pressure and minimizing infection risk.
Innovation Solution
A tissue interface comprising a manifold with interconnected fluid pathways, a hydrophilic or hydrophobic foam layer, and a bacterial barrier cover, integrated with a negative-pressure source and controller, to provide sustained negative pressure and promote tissue growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If negative-pressure therapy is applied to promote tissue growth, then tissue regeneration is improved, but risk of infection increases
Solution Approach 1:
The tissue interface is designed with spatially varying properties: the distal portion has high porosity (40-80%) to promote tissue ingrowth and granulation, while the proximal portion has low porosity (0-20%) to prevent bacterial migration. This local differentiation allows simultaneous tissue regeneration and infection protection.
Solution Approach 2:
The tissue interface combines multiple foam materials with different porosity levels in a single gradient structure, creating a composite material system that integrates both high porosity regions for tissue growth and low porosity regions for bacterial barrier functionality.
2Reliability
If high porosity foam is used to promote tissue ingrowth, then tissue regeneration is improved, but structural strength decreases
Solution Approach 1:
The foam layer is segmented into multiple regions with different porosity levels along the flow path. The distal segment has high porosity for tissue ingrowth, while the proximal segment has low porosity for structural strength and bacterial barrier function.
Solution Approach 2:
Different porosity levels are applied locally to different portions of the foam layer based on functional requirements: high porosity where tissue contact is needed, low porosity where structural integrity and bacterial protection are prioritized.
3Reliability
If gradient porosity structure is implemented, then tissue growth and infection protection are both improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process controls the porosity parameter of the foam material to vary continuously or in steps along the flow path, creating the gradient structure through parameter modification rather than assembling multiple discrete components.
Solution Approach 2:
The gradient porosity foam is produced as a single composite material structure with spatially varying properties, integrating multiple functional zones into one manufacturable component through controlled material synthesis.
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 enhances tissue growth and wound healing by maintaining consistent negative pressure, managing exudates, and reducing infection risk, suitable for various tissue types and conditions.
Implementation Method 1
reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site
Implementation Method 2
a hydrophilic or hydrophobic foam layer
Implementation Method 3
a hydrophilic or hydrophobic foam layer
Implementation Method 4
a bacterial barrier cover
Data Source
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AI summary
Dressings for treating a tissue site with negative pressure are disclosed, which may include a dressing having a manifold and a contact layer. In some embodiments, the manifold may comprise a plurality of holes, a first side, a second side, and a perimeter side between the first side and the second side. The contact layer may comprise collagen applied to the first side of the manifold and a perimeter side of the manifold. The plurality of holes of the manifold may include a center hole and a plurality of peripheral holes arranged around the center hole.