Layered Hydrocolloid Adhesive for Ostomy Moisture Management
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Solution Overview
Problem
Existing adhesive constructions for ostomy appliances face issues with moisture absorption and cohesion, leading to disintegration and skin irritation, particularly when exposed to stoma fluids, and require improved moisture management and adhesion properties.
Innovation Solution
A layered adhesive construction with two hydrocolloid layers, where the first layer has high initial moisture absorption capacity and the second layer provides enhanced cohesion after moisture absorption, with the second layer being thicker and placed away from the skin to manage moisture transport and prevent disintegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-layer hydrocolloid adhesive is used to achieve high moisture absorption capacity, then the initial moisture absorption rate is improved, but the adhesive cohesion and resistance to disintegration deteriorate
Solution Approach 1:
The adhesive construction is divided into two distinct layers: a first layer containing hydrocolloids optimized for high moisture absorption capacity and fast initial absorption, and a second layer containing hydrocolloids optimized for maintaining cohesion after moisture absorption. This segmentation allows each layer to perform its specialized function without compromising the other, resolving the contradiction between moisture absorption and cohesion.
Solution Approach 2:
Different regions of the adhesive construction are assigned different functional properties. The first layer (skin-contact layer) is designed with hydrocolloids providing high moisture absorption, while the second layer (away from skin) is designed with hydrocolloids providing improved cohesion. This local differentiation of quality allows the system to simultaneously achieve high moisture absorption and maintain structural integrity.
2Quantity of substance
If hydrocolloid adhesive absorbs moisture from stoma fluids, then moisture absorption capacity is improved, but adhesive disintegration increases
Solution Approach 1:
The adhesive is segmented into two layers with different hydrocolloid compositions. The first layer absorbs moisture from stoma fluids, while the second layer maintains structural integrity and prevents disintegration. This segmentation resolves the contradiction by separating the moisture absorption function from the structural stability function.
Solution Approach 2:
The second layer acts as an intermediary between the moisture-absorbing first layer and the backing layer. It receives the moisture absorbed by the first layer and provides a cohesive structure that prevents the adhesive from disintegrating, thus mediating between moisture absorption and structural integrity.
3Quantity of substance
If hydrocolloid adhesive is exposed to stoma fluids, then moisture absorption is improved, but skin irritation increases due to disintegration
Solution Approach 1:
The adhesive construction is segmented into two layers where the first layer safely absorbs moisture from stoma fluids and the second layer prevents disintegration. This segmentation eliminates the harmful effect of disintegration-induced skin irritation while maintaining the beneficial moisture absorption capacity.
Solution Approach 2:
The potential harm of moisture absorption leading to disintegration and skin irritation is converted into a benefit by using the absorbed moisture to activate the cohesive properties of the second layer's hydrocolloids, which then prevent disintegration and protect the skin from irritation.
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 solution effectively reduces adhesive disintegration and skin irritation by maintaining wet tack and improving adhesion, as demonstrated by clinical studies showing better skin contact and reduced erosion, with 77% of participants experiencing little to no erosion and improved adhesion and security.
Implementation Method 1
the hydrocolloids in the first adhesive layer provides a higher initial moisture absorption capacity and rate of moisture absorption
Implementation Method 2
the hydrocolloids in the second adhesive layer provides an improved cohesion following absorption of moisture to the adhesive
Data Source
AI summary
A layered adhesive construction comprising a backing layer and a first and second layer of hydrocolloid adhesive, where the first and second layer of hydrocolloid adhesive have different composition, and the second layer of hydrocolloid adhesive is at least partly interposed between the first layer of hydrocolloid adhesive and the backing layer, the first and second adhesive layers consisting of a continuous phase and a discontinuous phase where the discontinuous phase of the first adhesive layer comprises a hydrocolloids providing a higher moisture absorption capacity and higher initial rate of absorption to the adhesive layer than the hydrocolloids in the discontinuous phase of the second adhesive layer, and the discontinuous phase of second layer of adhesive comprises hydrocolloids providing a higher cohesion following moisture absorption to the adhesive compared to the hydrocolloid in the discontinuous phase of the first adhesive layer.