Open-Cell Foam Wound Dressing for Negative Pressure Fluid Removal
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Solution Overview
Problem
Existing negative-pressure therapy systems for wound care lack efficient fluid removal capabilities, which can impede the healing process and require frequent dressing changes.
Innovation Solution
A wound dressing layer comprising an open-cell foam with specific compression force deflection and density characteristics, designed to work within a negative-pressure therapy system to enhance fluid removal and tissue healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wound dressings are used in negative-pressure therapy, then the system structure is simple, but fluid removal efficiency is insufficient
Solution Approach 1:
The patent employs an open-cell foam material with specific porosity characteristics to enable efficient fluid removal. The porous structure allows fluid to pass through while maintaining the dressing's structural integrity and negative-pressure transmission capability, directly addressing the fluid removal efficiency problem without requiring complex additional components.
Solution Approach 2:
The patent specifies precise parameter ranges for the foam material including density (20-80 kg/m³), compression force deflection (≤9.8 kPa), and elastic modulus (10-100 kPa). By optimizing these physical parameters, the dressing achieves enhanced fluid removal efficiency while maintaining system simplicity through material property tuning rather than structural complexity.
2Strength
If foam density is increased to improve structural stability, then mechanical strength improves, but fluid removal capability decreases
Solution Approach 1:
The patent defines an optimal parameter window where density ranges from 20-80 kg/m³ and compression force deflection is ≤9.8 kPa. This parameter optimization balances structural strength requirements with fluid removal performance, ensuring the foam maintains adequate mechanical integrity while preserving sufficient porosity and compressibility for effective fluid evacuation.
Solution Approach 2:
The patent utilizes foam material that combines appropriate polymer matrices with controlled cellular structures to achieve a composite effect. This composite approach allows simultaneous optimization of mechanical properties and fluid transport characteristics, resolving the trade-off between strength and fluid removal capability.
3Productivity
If foam compressibility is increased to enhance fluid removal, then fluid transport improves, but mechanical support capability deteriorates
Solution Approach 1:
The patent specifies compression force deflection parameters (≤9.8 kPa) and elastic modulus ranges (10-100 kPa) to control foam compressibility. These parameter specifications ensure the foam is sufficiently compressible for fluid transport while maintaining adequate mechanical support strength to withstand negative-pressure application and provide structural stability during therapy.
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 described wound dressing layer improves fluid removal efficiency and promotes tissue healing by modulating fluid removal based on foam density and compressibility, potentially matching the performance of closed-loop systems without feedback.
Implementation Method 1
The foam may exhibit a density increase of a factor of at least 12 at about −75 mmHg
Implementation Method 2
operating the negative-pressure source to draw fluid from the tissue site through the wound dressing layer
Data Source
AI summary
Described herein are embodiments of a wound dressing layer. The wound dressing layer may include an open-cell foam. The foam may have a 50% compression force deflection of not more than about 4.8 kPa. The foam may also have a density of at least 24 kg/m3. The foam may exhibit a density increase of a factor of at least 12 at about −75 mmHg.