Silicone Wound Dressing Structure for High Exudate Absorption

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Solution Overview

Problem

Current wound dressings fail to simultaneously optimize absorption of high amounts of wound exudate, provide a wound-healing environment, prevent leakage, adhere to skin without irritation, act as a barrier against external factors, and maintain comfort for up to seven days.

Innovation Solution

A wound dressing comprising a backing layer, absorbent pad, and wound contact layer, with specific materials and configurations to enhance absorption, adhesion, and comfort, including a liquid-impermeable backing layer, absorbent core with cellulose and superabsorbent particles, and a silicone adhesive contact layer with controlled perforations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a wound dressing uses high absorption capacity materials, then wound exudate absorption is improved, but adhesion to skin and comfort during extended wear deteriorate

Engineering Contradiction:

Improveabsorption capacityVSAvoidadhesion to skin

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The wound dressing is divided into functionally distinct layers: a silicone adhesive contact layer for skin adhesion, an absorbent pad layer for exudate absorption, and a backing layer for support and moisture vapor transmission. This segmentation allows each layer to optimize its specific function without compromising other properties.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dressing combines multiple materials with complementary properties: silicone adhesive provides skin-friendly adhesion, superabsorbent particles provide high absorption capacity, and the composite structure allows simultaneous achievement of adhesion and absorption without irritation.

Inventive Principle:

Principle #40Composite materials

2Strength

If a wound dressing uses strong adhesive materials, then adhesion to skin is improved, but irritation to wound tissue and intact skin worsens

Engineering Contradiction:

Improveadhesion strengthVSAvoidskin irritation

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The adhesive properties are optimized by controlling the silicone adhesive layer thickness (10-50 μm) and composition, achieving sufficient adhesion strength while maintaining skin compatibility and preventing irritation through parameter optimization.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The silicone adhesive contact layer provides uniform, consistent adhesion across the entire wound surface, ensuring even distribution of adhesive forces and preventing localized irritation or trauma to the skin and wound tissue.

Inventive Principle:

Principle #33Homogeneity

3Duration of action of moving object

If a wound dressing is designed for extended wear, then treatment duration is improved, but leakage prevention and comfort deteriorate

Engineering Contradiction:

Improvewear durationVSAvoidleakage prevention

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The absorbent pad is designed to dynamically adapt to varying exudate volumes throughout the wear period, expanding to accommodate increased absorption needs while maintaining containment integrity and preventing leakage even during extended wear up to seven days.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The dressing is designed with sufficient absorbent capacity from the outset to handle expected exudate accumulation throughout the extended wear period, and the adhesive layers are pre-configured to maintain secure attachment and containment throughout the full duration without premature failure or leakage.

Inventive Principle:

Principle #10Preliminary action

4Object-affected harmful factors

If a wound dressing uses occlusive materials, then barrier protection is improved, but gas and vapor exchange worsens

Engineering Contradiction:

Improvebarrier protectionVSAvoidgas and vapor exchange

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The backing layer incorporates porous or micro-perforated structures that provide physical barrier protection against external contaminants while allowing selective passage of gas molecules and water vapor, enabling simultaneous achievement of barrier function and respiratory exchange.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

Different regions of the dressing have different permeability characteristics: the adhesive contact layer provides occlusive protection where needed, while the backing layer provides selective permeability for gas and vapor exchange, creating local quality variations that satisfy conflicting requirements in different areas.

Inventive Principle:

Principle #3Local quality

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 dressing achieves rapid and complete absorption of exudate, maintains adhesion to skin for extended periods, prevents leakage, and ensures comfort by balancing adhesiveness and flexibility, while allowing gas exchange and preventing irritation.

Implementation Method 1

The absorbent core comprises absorbent fibers and superabsorbent particles

Methodology Applied

Scientific EffectSuperabsorbency: Absorption (physical)

Implementation Method 2

The absorbent core comprises absorbent fibers and superabsorbent particles

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 3

The backing layer is substantially liquid-impermeable but permeable for water vapour

Methodology Applied

Scientific EffectPermeation: Permeation

Implementation Method 4

The backing layer is substantially liquid-impermeable but permeable for water vapour

Methodology Applied

Scientific EffectSelective permeability: Semipermeable Membrane

Implementation Method 5

The wound contact layer comprises a layer of skin-friendly silicone adhesive

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS12611335B2Superabsorbent wound dressing with silicone wound contact layer

Publication Date: 2026.04.28 PAUL HARTMANN AG

AI summary

Wound dressing (10, 30) comprising a backing layer (11, 31), an absorbent pad (12, 32) and a wound contact layer (13, 33), wherein the backing layer (11, 31) comprises a water vapour-permeable and substantially liquid-impermeable film material, wherein the absorbent pad (12, 32) comprises an absorbent core (15, 35) having a proximal side and a distal side, and an envelope (14, 34) surrounding the absorbent core (15, 35), the absorbent core (15, 35) comprising an absorbent material, and wherein the wound contact layer (13, 33) comprises a layer of a skin-friendly silicone adhesive (13b, 33b), characterized in that the envelope (14, 34) comprises a first layer (14a, 34a) of a first liquid-permeable material and a second layer (14b, 34b) of a second material different from the first material, wherein the first layer (14a, 34a) of the envelope (14, 34) covers the proximal side of the absorbent core (15, 35) and wherein the second layer (14b, 34b) of the envelope (14, 34) covers the distal side of the absorbent core (15, 35), and wherein the first layer (14a, 34a) of the envelope (14, 34) extends over the proximal side of the absorbent core (15, 35) and the second layer (14b, 34b) of the envelope (14, 34) extends over the distal side of the absorbent core (15, 35) each of them forming a border area (16, 36) surrounding the absorbent core (15, 35), the first (14a, 34a) and second layer (14b, 34b) of the envelope (14, 34) being joined to each other along the border area (16, 36) surrounding the absorbent core (15, 35).