Negative Pressure Wound Dressing With Flexible Suction Adapter

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Solution Overview

Problem

Existing NPWT systems are costly, bulky, and prone to failure, and the continuous evaporation of moisture vapor can lead to crust formation and blockages in the dressing, which can cause therapy to be halted, and the stiffness of the suction port can adversely affect the healing process.

Innovation Solution

A wound dressing with a transmission layer that remains open under negative pressure, an absorbent layer to store exudate, and a flexible suction adapter that prevents blockages and reduces patient discomfort by being soft and conformable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a separate canister is provided for storage of wound exudate, then exudate can be stored for later disposal, but the system becomes costly, bulky, and prone to failure

Engineering Contradiction:

Improveexudate storage capacityVSAvoidsystem complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent combines the exudate storage function directly into the wound dressing structure by incorporating an absorbent layer that stores exudate within the dressing itself, eliminating the need for a separate external canister. This integration reduces system complexity while maintaining exudate storage capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The wound dressing is designed to be self-contained with the absorbent layer providing internal exudate storage and management. The dressing handles its own exudate collection and storage without requiring external canister components, making the system self-sufficient and reducing overall complexity.

Inventive Principle:

Principle #25Self-service

2Loss of energy

If a moisture vapor permeable cover layer is used to allow continuous evaporation, then liquid can constantly escape from the dressing, but crust formation and blockages occur in the flowpath

Engineering Contradiction:

Improvefluid removal efficiencyVSAvoidflowpath畅通性

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent applies different properties to different layers: the cover layer is moisture vapor permeable for evaporation, while the transmission layer is specifically designed to remain open and prevent crust formation. This localized quality differentiation allows evaporation benefits while preventing blockages in the critical flowpath.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potential harm of crust formation into a benefit by designing the transmission layer to specifically prevent crust formation while allowing the moisture vapor permeable cover layer to provide evaporation. The transmission layer's open structure captures the evaporating moisture before it can form crusts, turning the evaporation process into a beneficial fluid removal mechanism without the harmful blockage side effect.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Strength

If a stiff suction port is used to maintain structural integrity, then negative pressure can be maintained, but patient movement or pressure can disturb the wound bed and delay healing

Engineering Contradiction:

Improvestructural integrityVSAvoidwound bed disturbance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional stiff suction port with a flexible port constructed from compliant materials that can deform and conform to patient movement and pressure. This flexible port maintains the necessary structural integrity for negative pressure transmission while adapting to patient motion, preventing disturbance to the wound bed and eliminating the need for rigid protective structures.

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 preventing blockages and reducing patient discomfort through efficient exudate absorption and transmission, maintaining consistent negative pressure.

Implementation Method 1

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 2

transmit negative pressure from a pump to the wound dressing

Methodology Applied

Scientific EffectNegative pressure transmission: Pressure Gradient

Implementation Method 3

an absorbent layer for absorbing wound exudate

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentEP3650055B1Apparatuses and methods for negative pressure wound therapy

Publication Date: 2026.01.07 SMITH & NEPHEW PLC

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AI summary

Disclosed herein are several embodiments of a negative pressure appliance and methods of using the same in the treatment of wounds. Some embodiments are directed towards wound dressings comprising 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. Some embodiments are directed to improved fluidic connectors or suction adapters for connecting to a wound site, for example using softer, kink-free conformable suction adapters.