Negative Pressure Wound Dressing for Adhesion and Exudate Flow

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Solution Overview

Problem

Conventional wound dressings face issues with adhesive skin contact layers that either lose breathability due to perforation closure or compromise adhesion, leading to exudate pooling and dressing detachment, while absorbent layers fail to maintain flexibility and absorbency, causing discomfort and hygiene issues.

Innovation Solution

A negative pressure wound dressing with an adhesive skin contact layer and an absorbent structure featuring a wound contact layer with warp stitches on one surface and warp and weft stitches on the other, minimizing non-gelling fibers at the wound contact surface to enhance adhesion and absorption, preventing exudate pooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the perforations in the adhesive skin contact layer are made smaller to prevent tissue ingrowth and maintain adhesion, then adhesion strength is improved, but breathability deteriorates causing exudate accumulation

Engineering Contradiction:

Improveadhesion strengthVSAvoidexudate accumulation

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The adhesive skin contact layer incorporates regions with different perforation characteristics - some areas have smaller perforations for adhesion while other areas have larger perforations for breathability. This local differentiation allows the layer to simultaneously achieve strong adhesion and adequate breathability without compromising either function.

Inventive Principle:

Principle #3Local quality

2Object-generated harmful factors

If the perforations are made larger to improve breathability, then breathability is improved, but adhesion strength deteriorates causing dressing detachment

Engineering Contradiction:

ImprovebreathabilityVSAvoidadhesion strength

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If conventional hot pin process is used to form perforations, then manufacturing simplicity is improved, but surface quality deteriorates due to slug formation and non-planar surfaces

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidsurface planarity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent replaces the conventional hot pin mechanical process with an ultrasonic vibration-based perforation method. The ultrasonic vibrations enable clean perforation formation without slug generation, producing planar surfaces suitable for adhesive layers while maintaining manufacturing efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Object-generated harmful factors

If absorbent material is used to collect exudate, then exudate management is improved, but the dressing becomes bulkier and less portable

Engineering Contradiction:

Improveexudate managementVSAvoiddressing volume

Core Design Contradiction:

Object-generated harmful factorsVSVolume of moving object

Solution Approach 1:

The patent employs thin film absorbent materials that provide effective exudate management while maintaining a compact, flexible profile. These thin film structures enable the dressing to remain portable and conformable without requiring bulky conventional absorbent components.

Inventive Principle:

Principle #30Flexible shells and thin films

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 maintains optimal wound healing conditions by reducing exudate pooling and ensuring strong layer adhesion, even when wet, thus enhancing user comfort and hygiene.

Implementation Method 1

the wound contact layer comprises a plurality of gel-forming fibres

Methodology Applied

Scientific EffectGelation: Gel

Implementation Method 2

the adhesive skin contact layer comprises a silicone adhesive

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentEP4647052A1A wound dressing

Publication Date: 2025.11.12 CONVATEC LTD

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AI summary

A negative pressure wound dressing comprising a backing layer, an adhesive skin contact layer and an absorbent structure arranged between the backing layer and the adhesive skin contact layer, wherein the adhesive skin contact layer is configured to detachably adhere the dressing to a dermal surface, wherein the backing layer comprises a coupling member configured to connect the dressing to a negative pressure source, wherein the absorbent structure comprises a wound contact layer arranged to contact the wound when the adhesive skin contact layer is adhered to the skin adjacent the wound, and the wound contact layer may have a first surface and a second surface, wherein the first surface of the wound contact layer may contact the wound in use, wherein the first surface may comprise warp stitches, and the second surface may comprise warp and weft stitches