3D Knitted Wound Dressing for Exudate Storage and Flow

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Solution Overview

Problem

Existing wound dressings for negative pressure therapy face issues with limited exudate storage capacity, blockages due to solid matter accumulation, and vulnerability to compressive and shear forces, which can disrupt wound healing.

Innovation Solution

A wound dressing with a 3D knitted transmission layer, absorbent layer, and moisture vapor permeable cover layer, designed to collect and store exudate, manage fluid flow, and dissipate forces, while maintaining an open flow path and preventing blockages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If wound exudate is stored in the wound dressing itself, then a separate canister is eliminated (reducing cost and bulk), but the dressing has limited fluid uptake capacity requiring frequent changes

Engineering Contradiction:

Improveelimination of separate canisterVSAvoidtime of use between dressing changes

Core Design Contradiction:

Device complexityVSDuration of action of moving object

Solution Approach 1:

The patent employs a porous foam dressing material that can absorb and retain wound exudate within its cellular structure. The porous nature allows the dressing to take up fluid while maintaining structural integrity, extending the duration of use without requiring a separate canister for exudate collection.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The wound dressing combines multiple materials with complementary properties: a foam core for exudate absorption, an occlusive layer for moisture vapor transmission, and potentially superabsorbent polymers. This composite structure enables the dressing to function as both the wound cover and the exudate storage medium, eliminating the need for separate components.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If a liquid impermeable moisture vapor permeable cover layer is used, then liquid exudate can evaporate continuously, but solid particulate matter builds up and causes blockages in the flowpath

Engineering Contradiction:

Improvecontinuous evaporation of liquidVSAvoidblockage of flowpath

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The dressing is divided into functional zones: an occlusive cover layer for moisture vapor transmission, a foam body for exudate absorption and storage, and potentially a separate waste canister interface. This segmentation allows liquid evaporation through the cover while solid particles are contained and managed in the foam structure, preventing flowpath blockages.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The foam material acts as an intermediary between the wound exudate and the external environment. It absorbs liquid exudate within its matrix, allowing controlled evaporation while filtering and containing solid particulate matter, thus preventing blockages in the negative pressure system.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If negative pressure is applied to the wound dressing, then wound healing is accelerated, but compressive and shear forces from patient movement can harm the healing wound

Engineering Contradiction:

Improvehealing rateVSAvoidcompressive and shear forces

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The foam dressing material provides inherent cushioning and shock absorption properties before external forces are applied. Its cellular structure compresses under load, dissipating compressive and shear forces from patient movement, thereby protecting the healing wound while maintaining the negative pressure therapy effect.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The dressing incorporates flexible foam material that can deform and conform to body movements without transmitting harmful forces to the wound. The flexible structure absorbs mechanical stresses while maintaining the sealed environment necessary for negative pressure therapy, allowing continuous treatment despite patient activity.

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 extends the therapy duration by absorbing exudate, reduces blockages, and protects the wound from forces, ensuring continuous negative pressure application and enhanced healing.

Implementation Method 1

an absorbent layer for absorbing wound exudate, the absorbent layer overlying the transmission layer

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

The moisture vapor permeability of this covering layer is selected so that liquid can constantly evaporate away from the top of the dressing

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

TNP therapy assists in the closure and healing of wounds by reducing tissue oedema; encouraging blood flow; stimulating the formation of granulation tissue; removing excess exudates

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Data Source

PatentUS12419789B2Wound dressing and method of use

Publication Date: 2025.09.23 SMITH & NEPHEW PLC

AI summary

A system, method, and apparatus are disclosed for dressing a wound. The apparatus comprises a liquid and gas permeable transmission layer, an absorbent layer for absorbing wound exudate, the absorbent layer overlying the transmission layer, a gas impermeable cover layer overlying the absorbent layer and comprising a first orifice, wherein the cover layer is moisture vapor permeable.