Hydrophilic Foam Cell Size Control for Wound Exudate Management
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Solution Overview
Problem
Current hydrophilic foam materials used in wound dressings lack optimal liquid handling capabilities, particularly in terms of absorption speed and capacity, due to inconsistent foam cell sizes, which affect their performance in managing wound exudate.
Innovation Solution
Incorporating nucleating particles at a concentration of 5-25% by weight into the foam manufacturing process to control and reduce foam cell size to 0.01 mm² or less, improving homogeneity and enhancing liquid absorption and spreading properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard foam manufacturing processes are used, then foam production is simple and cost-effective, but foam cell size is inconsistent and difficult to control
Solution Approach 1:
Nucleating particles are introduced as intermediary substances during foam manufacturing to mediate and control foam cell formation. These particles serve as nucleation sites that guide bubble formation, resulting in consistent and controlled foam cell sizes while maintaining the simplicity of the overall manufacturing process
Solution Approach 2:
The invention controls foam cell size by changing the parameter of nucleation site density through the addition of nucleating particles. By adjusting the concentration and size distribution of these particles, the foam cell size and uniformity can be precisely controlled without complicating the manufacturing process
2Quantity of substance
If foam cell size is reduced to improve absorption capacity, then liquid absorption speed and capacity increase, but manufacturing control becomes more difficult
Solution Approach 1:
Nucleating particles act as intermediaries that enable precise control over foam cell size reduction. These particles provide numerous nucleation sites that facilitate the formation of many small, uniform cells, thereby increasing liquid absorption capacity while maintaining manufacturing consistency
Solution Approach 2:
The invention utilizes porous nucleating particles that facilitate controlled foam cell formation. The porous structure of these particles provides extensive surface area for nucleation, enabling consistent production of small foam cells with high liquid absorption capacity
3Ease of operation
If foam cell size is made uniform to improve liquid spreading, then liquid handling capability improves, but process control requirements increase
Solution Approach 1:
Nucleating particles serve as intermediaries that naturally promote uniform foam cell formation during the foaming process. Their presence ensures consistent cell size distribution throughout the foam, improving liquid spreading capability without requiring complex process control mechanisms
Solution Approach 2:
The nucleating particles enable the foam system to self-organize into uniform cell structures during manufacturing. The particles automatically distribute and guide bubble formation, resulting in homogeneous foam cell sizes and improved liquid handling properties without additional process intervention
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 resulting hydrophilic polyurethane foam exhibits improved fluid absorption speed and capacity, with at least 85% of foam cells having a uniform small size, leading to increased absorption efficiency and reduced foam stiffness, making it suitable for medical applications.
Implementation Method 1
comprising nucleating particles present at a concentration of from 5 to 25 % by weight of said foam material... at least 85% of all foam cells in said foam material have an average cell size of 0.01 mm²
Implementation Method 2
hydrophilic materials are used in wound dressings to absorb and retain wound fluids... hydrophilic open-cell polyurethane foams
Data Source
Figure 1~2b
Figure 2c~2d
Figure 3~4
AI summary
The present invention relates to a hydrophilic foam material, which is of particular use in wound treatment, and toa method for producing said hydrophilic foam material.The hydrophilic foam material comprises nucleating particles, wherein at least 85% of all foam cells in said foam material have an average cell size of 0.01 mm 2 or less.