Suction Port for Wound Dressing Negative Pressure Therapy

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Solution Overview

Problem

Existing topical negative pressure (TNP) therapy systems are bulky, expensive, and require complex operation, making them unsuitable for portable and home use. Additionally, the collection and storage of wound exudate in traditional systems can be inefficient and unhygienic.

Innovation Solution

A suction port system that applies negative pressure to a wound dressing, allowing wound exudate to be collected and stored within the dressing itself. The system includes a connector for negative pressure, a sealing surface for the dressing, and a liquid-impermeable gas-permeable filter element to prevent liquid entry into the connector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wound exudate is collected in a separate waste canister connected to the pump unit, then the therapy unit can effectively remove wound exudate, but the apparatus becomes bulky and expensive to manufacture

Engineering Contradiction:

Improvewound exudate collection effectivenessVSAvoidapparatus size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent combines the wound exudate collection function with the wound dressing itself by making the dressing liquid impermeable and gas permeable, allowing it to act as both the therapeutic interface and the waste canister. This eliminates the need for a separate external canister, reducing apparatus size while maintaining exudate collection effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The wound dressing is designed to perform multiple functions simultaneously: it provides the therapeutic interface for negative pressure application, maintains the sealed environment, and serves as the collection container for wound exudate. This multi-functionality eliminates the need for separate dedicated collection components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate waste canister is used for collecting wound exudate, then the therapy unit can maintain negative pressure, but the canister replacement process becomes time-consuming and unhygienic

Engineering Contradiction:

Improvenegative pressure maintenanceVSAvoidcanister replacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

By integrating the collection function into the wound dressing itself, the system eliminates the need for separate canister replacement. The dressing remains in place during therapy and is replaced as a single unit with the wound seal, significantly reducing replacement time and improving hygiene by minimizing exposure to wound exudate.

Inventive Principle:

Principle #5Merging (Combining)

3Quantity of substance

If the wound dressing absorbs excessive wound exudate, then the dressing capacity increases, but blockages occur that reduce the dressing's useful lifetime

Engineering Contradiction:

Improveexudate absorption capacityVSAvoiddressing useful lifetime

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The patent employs a gas permeable membrane in the wound dressing that allows gases to pass through while blocking liquids. This porous structure maintains high exudate absorption capacity in the liquid-impermeable layer while preventing blockages by allowing gas flow through the gas-permeable membrane, thereby extending the dressing's useful lifetime.

Inventive Principle:

Principle #31Porous materials

4Reliability

If the therapy unit is designed for hospital use with complex operation, then the negative pressure application is effective, but the apparatus is not suitable for portable home use

Engineering Contradiction:

Improvenegative pressure therapy effectivenessVSAvoidportability and ease of use

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent integrates the waste collection function into the wound dressing itself, eliminating the need for separate canisters and reducing the overall system complexity. This integration simplifies the apparatus design, making it more suitable for portable home use while maintaining effective negative pressure therapy.

Inventive Principle:

Principle #5Merging (Combining)

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 system enables efficient collection and storage of wound exudate within the wound dressing, reducing the frequency of dressing changes and preventing blockages, thus extending the dressing's useful lifetime and improving hygiene.

Implementation Method 1

a liquid impermeable gas permeable filter element arranged to prevent a liquid entering the connector portion

Methodology Applied

Scientific EffectLiquid impermeable gas permeable filtration: Filter (physical)

Data Source

PatentEP3539579B1Suction port

Publication Date: 2025.06.11 SMITH & NEPHEW PLC

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AI summary

A method and a wound dressing are disclosed for applying negative pressure to a wound. The wound dressing comprises a gas impermeable cover layer comprising an orifice, an absorbent layer for absorbing wound exudate, a transmission layer and a suction port sealed to the top of the cover layer over the orifice and configured to communicate negative pressure through the orifice.