Wound Dressing With Orifices For Negative Pressure

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Solution Overview

Problem

Existing wound dressing systems for topical negative pressure (TNP) therapy are bulky, expensive, and require frequent replacement, with inefficient exudate collection and storage, making them unsuitable for portable and home use, and prone to blockages that reduce their lifespan.

Innovation Solution

A wound dressing with an absorbent layer and a gas-impermeable cover layer featuring orifices for negative pressure communication, designed to collect and store exudate, featuring baffle elements and air channels to manage fluid flow and prevent blockages, allowing for extended use and easy disposal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate waste canister is connected to the pump unit for collecting wound exudate, then the therapy unit can effectively collect and store wound exudate, but the apparatus becomes bulky and expensive to manufacture

Engineering Contradiction:

Improveexudate collection capabilityVSAvoidapparatus bulk and manufacturing cost

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the waste canister function directly into the wound dressing by incorporating an absorbent layer within the dressing structure itself. This integration eliminates the need for a separate external canister, thereby reducing apparatus bulk and manufacturing complexity while maintaining effective exudate collection capability through the absorbent materials embedded in the dressing layers.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The wound dressing is designed to perform multiple functions: it provides the therapeutic interface with the wound, maintains the sealed environment for negative pressure therapy, and simultaneously serves as the waste collection system through its absorbent layer. This multi-functionality eliminates the need for separate dedicated canister components, reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate waste canister is used for collecting wound exudate, then exudate storage is effective, but replacing the canister is time-consuming and unhygienic

Engineering Contradiction:

Improveexudate storage capabilityVSAvoiddressing replacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

By integrating the absorbent layer directly into the wound dressing structure, the waste collection function becomes inseparable from the therapeutic dressing itself. This means that when the dressing is changed for treatment or hygiene reasons, the exudate collection capacity is automatically replaced as well, eliminating the separate time-consuming canister replacement step.

Inventive Principle:

Principle #5Merging (Combining)

3Duration of action of moving object

If the absorbent layer has high capacity for absorbing wound exudate, then the frequency of dressing changes is reduced, but the dressing may become too bulky

Engineering Contradiction:

Improvedressing lifespanVSAvoiddressing bulk

Core Design Contradiction:

Duration of action of moving objectVSVolume of moving object

Solution Approach 1:

The patent employs porous absorbent materials within the absorbent layer that can achieve high exudate absorption capacity through their porous structure. This allows the dressing to absorb large volumes of exudate while maintaining a relatively thin and compact profile, as the porosity provides high surface area and absorption capacity without requiring excessive material volume.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The wound dressing utilizes composite material structures combining different layers with complementary properties. The absorbent layer is integrated with other functional layers in a composite structure that optimizes both absorption capacity and overall dressing thickness, allowing high exudate capacity without excessive bulk.

Inventive Principle:

Principle #40Composite materials

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 effectively collects and transpires wound exudate, extending its lifespan, reducing the need for frequent changes, and maintaining an optimal environment for wound healing while preventing blockages and bacterial contamination.

Implementation Method 1

an absorbent layer for absorbing wound exudate

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

applying negative pressure at at least one orifice in the cover layer, said at least one orifice configured to allow negative pressure to be communicated through the cover layer

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 3

featuring baffle elements and air channels to manage fluid flow and prevent blockages

Methodology Applied

Scientific EffectFluid flow management:

Data Source

PatentEP2563307B1Wound dressing

Publication Date: 2017.04.19 SMITH & NEPHEW PLC

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AI summary

A method and apparatus are disclosed for dressing a wound. The apparatus comprises an absorbent layer for absorbing wound exudate, a gas impermeable cover layer overlying the absorbent layer the cover layer, comprising at least one orifice Configured to allow negative pressure to be communicated though the cover layer in at least two spaced apart regions.