Silicone Foam Absorbent Structure with Anchored Hydrophilic Particles
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Solution Overview
Problem
Existing wound dressings face issues such as tissue trauma during removal, limited exudate absorption, swelling leading to skin separation, and infection risks due to poor liquid retention and adhesive properties.
Innovation Solution
A monolithic absorbent structure featuring a hydrophobic silicone foam with anchored hydrophilic particles and a vapor permeable backing layer, where the silicone foam is cross-linked to create a liquid retention portion and an elastomeric skin-adherent portion, minimizing trauma and enhancing fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensitive adhesive layer is used to secure the dressing to skin, then the dressing is securely maintained, but the glue may strip the central portion of the dressing and damage healing tissue
Solution Approach 1:
The patent removes the pressure sensitive adhesive layer from the dressing structure entirely. The dressing relies on its own elastic properties and conformability to adhere to the skin without requiring separate adhesive components, thereby eliminating tissue damage from glue stripping while maintaining secure placement
Solution Approach 2:
The dressing utilizes its own elastomeric properties to achieve self-adhesion to the skin. The material naturally conforms to body contours and maintains attachment through its inherent elastic memory, eliminating the need for external adhesives that cause tissue trauma
2Reliability
If hydrophilic polymeric foam is used as absorbent layer, then the dressing provides moisture retention, but the foam is limited in the amount of exudate that may be absorbed
Solution Approach 1:
The patent changes the fundamental absorption parameter by using superabsorbent polymer particles with exceptional absorbency capabilities (5-10 times their weight in exudate) rather than conventional hydrophilic foam. This parameter change dramatically increases the quantity of exudate that can be absorbed while maintaining moisture retention at the wound interface
Solution Approach 2:
The dressing combines elastomeric silicone foam with superabsorbent polymer particles to create a composite absorbent structure. The silicone foam provides moisture retention and conformability, while the superabsorbent particles provide high-capacity exudate absorption, achieving both moisture retention and increased absorption quantity
3Quantity of substance
If hydrophilic foam dressing absorbs exudate, then the absorbent layer swells and pushes up against the wound, but continued swelling induces separation of the skin adherent layer from the skin
Solution Approach 1:
The patent applies different material properties to different regions: the superabsorbent polymer particles absorb exudate with minimal swelling, while the elastomeric silicone foam provides structural stability and conformability. This local differentiation of material qualities allows high absorption capacity without compromising dressing integrity or causing skin separation
Solution Approach 2:
The patent changes the swelling parameter by using superabsorbent polymer particles that absorb exudate through osmotic pressure without significant volume expansion. Unlike hydrophilic foam that swells uniformly, the particles absorb liquid while maintaining the structural integrity of the dressing matrix, preventing skin separation
4Reliability
If cellular tissue grows into the coarse and porous exterior surface of foam dressing, then the dressing adheres to the wound, but removing the dressing will traumatize the wound
Solution Approach 1:
The patent changes the surface texture parameter from coarse and porous to smooth and non-adherent. The elastomeric silicone foam provides a smooth surface that prevents cellular tissue infiltration, allowing the dressing to maintain contact with the wound for reliable adhesion while enabling painless, trauma-free removal
Solution Approach 2:
The dressing is designed as a disposable product that can be applied and removed multiple times without causing trauma. The non-adherent smooth surface allows the dressing to be changed frequently if needed, with each application and removal cycle being painless and non-traumatic to the healing wound
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 absorbent structure effectively manages moisture, reduces wound trauma, and maintains secure placement without adhesives, improving dressing durability and healing by uniformly absorbing and releasing moisture.
Implementation Method 1
a plurality of hydrophilic particles 20 anchored to the pore walls 18
Implementation Method 2
a vapor permeable, liquid impervious backing layer secured to the second surface of the silicone foam
Data Source
Figure 1~3
AI summary
An absorbent structure (10) comprising a silicone foam (14) having pore walls (18) and a plurality of hydrophilic particles (20) anchored to the pore walls (18) of the foam (14). Some of the hydrophilic particles (20) have an anchored portion (24) firmly anchored to the pore walls (18) and an exposed portion (22) extending outwardly away from the pore walls (18) upon which the anchored portion (24) is secured.