Multilayer Adhesive Composite for Wound Dressings
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Solution Overview
Problem
Current hydrocolloid dressings and adhesive articles face challenges in achieving high fluid handling capacity and moisture vapor transmission while maintaining flexibility and comfort, often resulting in thick and less effective wound dressings.
Innovation Solution
A multilayer adhesive composite is developed, comprising a polymeric backing layer with two fluid absorbing adhesive layers: a thin solvent-based acrylic adhesive layer containing a super-absorbent polymer and a thicker rubber-based adhesive layer, enhancing fluid handling capacity without significant thickness increase, and ensuring superior skin adhesion and breathability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the adhesive layer is increased to improve fluid handling capacity, then the fluid handling capacity improves, but the flexibility and comfort deteriorate
Solution Approach 1:
The adhesive layer is divided into multiple sub-layers with different thicknesses and compositions. The first sub-layer (40-150 μm) contains super-absorbent polymer for fluid absorption, while the second sub-layer (150-300 μm) contains hydrocolloid for moisture vapor transmission. This segmentation allows each sub-layer to perform its specific function optimally without requiring the entire adhesive layer to be thick, thus maintaining flexibility and comfort while achieving high fluid handling capacity.
2Quantity of substance
If the thickness of the adhesive layer is increased to improve fluid handling capacity, then the fluid handling capacity improves, but the breathability deteriorates
Solution Approach 1:
The adhesive layer is segmented into two functional sub-layers: the first sub-layer with super-absorbent polymer handles fluid absorption, while the second sub-layer with hydrocolloid provides breathability through moisture vapor transmission. This segmentation allows the thinner overall structure to maintain both high fluid handling capacity and good breathability, as each sub-layer is optimized for its specific function rather than relying on increased thickness.
Solution Approach 2:
The adhesive layer is constructed as a composite of two different materials: super-absorbent polymer in the first sub-layer and hydrocolloid in the second sub-layer. This composite structure enables the adhesive layer to simultaneously achieve high fluid handling capacity through the super-absorbent polymer and high breathability through the hydrocolloid, without requiring increased thickness that would compromise either property.
3Device complexity
If a single adhesive layer is used to simplify structure, then the device complexity is reduced, but the fluid handling capacity and breathability cannot be optimized simultaneously
Solution Approach 1:
The adhesive layer is segmented into two sub-layers with different compositions and functions. The first sub-layer contains super-absorbent polymer for fluid absorption, while the second sub-layer contains hydrocolloid for moisture vapor transmission. This segmentation allows the adhesive article to achieve both high fluid handling capacity and high breathability simultaneously, with the added complexity being minimal and the performance benefits being substantial.
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 multilayer composite achieves a fluid handling capacity of at least 4000 g/m²/24 hours with a moisture vapor transmission rate of at least 1100 g/m²/24 hours, providing improved absorption and evaporation capabilities while maintaining flexibility and comfort for wound dressings.
Implementation Method 1
a solvent-based acrylic pressure sensitive adhesive comprising 20-80% by weight of at least one super-absorbent polymer
Implementation Method 2
fluid absorbing adhesive layer
Implementation Method 3
have a high moisture vapor transmission rate (MVTR)
Implementation Method 4
the first surface of the first adhesive layer is adhered to the second surface of the backing layer
Data Source
Figure 1~4
Figure 5~7
AI summary
A fluid absorbing pressure sensitive adhesive composition and adhesive articles including the fluid absorbing adhesive that have particular utility in the medical field, and in particular, for use with wound dressings is provided. The adhesive composition has superior fluid handling capacity, moisture vapor transmission and skin adhesion.