Layered Wound Dressing with Superabsorbent Polymer Moisture Retention

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Solution Overview

Problem

Existing wound dressings with superabsorbent fibers face issues of rigidity, reduced conformability, and increased risk of maceration due to moisture loss, leading to discomfort and potential delamination from the skin.

Innovation Solution

A wound dressing composition with a first absorbent layer, a second layer of superabsorbent polymer in powder or granule form, and a third layer of superabsorbent fibers, where the polymer layer is positioned between the absorbent and fiber layers to maintain moisture levels and prevent drying.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If superabsorbent fibers are used to absorb wound exudate, then fluid absorbency is improved, but the dressing becomes rigid and loses conformability

Engineering Contradiction:

Improvefluid absorbencyVSAvoidconformability

Core Design Contradiction:

Quantity of substanceVSShape

Solution Approach 1:

The patent combines superabsorbent fibers with elastomeric polymers to create a composite material that maintains both high fluid absorbency and flexibility. The elastomeric component provides elastic recovery that allows the dressing to conform to body contours even when the superabsorbent fibers are saturated with fluid.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the physical parameters of the superabsorbent material by incorporating elastomeric polymers, which change the mechanical properties of the composite. This allows the material to maintain flexibility and conformability while retaining its fluid absorption capacity through parameter modification rather than using a single material type.

Inventive Principle:

Principle #35Parameter changes

2Shape

If a non-breathable backing layer is used to minimize moisture loss, then conformability is maintained, but total fluid handling capacity is reduced and maceration risk increases

Engineering Contradiction:

ImproveconformabilityVSAvoidtotal fluid handling capacity

Core Design Contradiction:

ShapeVSQuantity of substance

Solution Approach 1:

The patent uses a composite structure where superabsorbent fibers are combined with elastomeric polymers in the absorbent layer, allowing the use of a more breathable backing layer. The composite absorbent layer compensates for increased breathability by maintaining high fluid retention through the elastomeric network, enabling better conformability without sacrificing fluid handling.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different properties to different layers: the absorbent layer contains elastomeric polymers for flexibility and fluid retention, while the backing layer can be optimized for breathability. This local differentiation allows each layer to perform its specific function optimally, with the elastomeric layer compensating for moisture loss through its retention properties.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If superabsorbent material is allowed to dry out to increase breathability, then moisture vapour transmission is improved, but the dressing becomes brittle and less conformable

Engineering Contradiction:

Improvemoisture vapour transmissionVSAvoidbrittleness

Core Design Contradiction:

Use of energy by moving objectVSStrength

Solution Approach 1:

The elastomeric polymer network in the composite material maintains structural integrity and flexibility even when the superabsorbent fibers dry out. The elastomeric component acts as a structural scaffold that prevents brittleness, allowing the dressing to remain conformable while permitting higher moisture vapour transmission through the dried superabsorbent regions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent creates a dynamic system where the superabsorbent fibers can dry out and the elastomeric polymers can rehydrate, allowing the material to adapt its properties over time. This dynamic equilibrium enables the dressing to transition between states of hydration, maintaining flexibility through the elastomeric network while allowing moisture transmission when dried.

Inventive Principle:

Principle #15Dynamics

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 composition maintains conformability and comfort by preventing the superabsorbent fibers from drying out, reducing the risk of delamination and maceration, while maintaining effective fluid handling capabilities.

Implementation Method 1

a second layer of superabsorbent polymer in the form of a powder or granules... positioned between the first layer and the third layer to maintain moisture levels and prevent drying

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

when the superabsorbent material absorbs wound exudate, it typically expands and swells. In some instances, the superabsorbent material gels.

Methodology Applied

Scientific EffectSwelling: Hydrogel

Data Source

PatentUS12447052B2Wound dressing

Publication Date: 2025.10.21 MEDTRADE PROD

AI summary

The present invention relates to a wound dressing composition for use as or in a wound dressing and to methods of making the wound dressing composition. The wound dressing composition comprises an absorbent material, an adhesive material and an anchor material attached to the absorbent material and the adhesive material. The anchor material is operable to maintain a link between the absorbent material and the adhesive material when the wound dressing composition is wet.