Segmented NPWT Wound Dressing for Uniform Circumferential Pressure

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Solution Overview

Problem

Venous leg ulcers and other circumferential wounds require a wound dressing that can apply consistent pressure and effectively manage exudate, as compression bandages often fail to provide uniform pressure and can cause discomfort or delayed healing.

Innovation Solution

A negative pressure wound therapy dressing with a cover layer, spacer sections, and a connector that allows for fluidic connection to a source of negative pressure, providing a sealed environment and consistent pressure application around the wound.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If compression bandages are used to treat venous leg ulcers, then the wound can be treated with a simple dressing, but the pressure applied varies along different locations with different circumferences and can cause pain or delayed healing

Engineering Contradiction:

Improvesimplicity of dressingVSAvoiduniformity of pressure application

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The dressing is divided into multiple independent spacer sections (first spacer section, second spacer section, etc.) that can be individually positioned and sealed to the wound contact layer. Each spacer section independently applies pressure to its corresponding region, allowing uniform pressure distribution across varying circumferences while maintaining simplicity through modular construction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each spacer section is configured to be sealed to the wound contact layer at specific gap regions, creating localized sealed chambers. This allows each section to apply optimized pressure to its specific location, accommodating variations in limb circumference while ensuring uniform pressure application across the entire wound surface.

Inventive Principle:

Principle #3Local quality

2Reliability

If compression bandages are applied to reduce oedema and improve vein circulation, then the wound healing process can be supported, but incorrect application can cause pain and tissue necrosis

Engineering Contradiction:

Improveeffectiveness of wound treatmentVSAvoidpain and tissue necrosis

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention replaces the mechanical compression bandage system with a negative pressure wound therapy system. A pump generates negative pressure that is transmitted through flexible channels in the spacer sections to the wound contact layer. This substitution eliminates the need for manual bandaging, ensuring correct and safe application while maintaining effective pressure for reducing oedema and improving circulation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system incorporates a control unit that monitors and regulates the negative pressure applied through the pump. This feedback mechanism ensures that pressure remains within safe and effective ranges, preventing both insufficient treatment and harmful effects such as pain and tissue necrosis, thereby improving reliability of the wound treatment.

Inventive Principle:

Principle #23Feedback

3Device complexity

If a single sealed chamber is used in the dressing, then the structure is simple, but the pressure distribution may be uneven across different regions of the wound

Engineering Contradiction:

Improvenumber of sealed chambersVSAvoiduniformity of pressure distribution

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from a single two-dimensional sealed chamber to multiple three-dimensional sealed chambers created by positioning spacer sections at different locations and sealing them individually to the wound contact layer. This dimensional approach allows pressure to be applied uniformly across the entire wound surface while accommodating variations in limb geometry.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 reduces tissue edema, promotes blood flow, and manages exudate, enhancing wound healing by maintaining consistent pressure and minimizing discomfort.

Implementation Method 1

a source of negative pressure... configured to be connected to the source of negative pressure... Each of the plurality of spacer sections can be fluidically isolated from the other spacer sections except for at the connector

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Data Source

PatentUS12419790B2Apparatuses and methods for negative pressure wound therapy

Publication Date: 2025.09.23 T J SMITH & NEPHEW

AI summary

Disclosed embodiments related to a wound dressing for treating circumferential wounds for use in a negative pressure wound therapy (NPWT). The wound dressing can include a cover layer, a plurality of spacer sections, and a wound contact layer. The wound dressing can further include a port for connection to a source of negative pressure and a connector for fluidically connecting each of the plurality of sections with the port.