Passive Negative Pressure Dressing via Oxygen Scavenging

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Solution Overview

Problem

Conventional dressings configured for active negative pressure are often too large for facial areas, making them unsuitable for facial surgeries or treatments where a smaller, lower profile dressing is required to facilitate healing and prevent infection.

Innovation Solution

A passive negative pressure dressing comprising a film layer, an oxygen scavenging layer, an absorbent layer, and a foam layer, where the oxygen scavenging layer, typically containing an iron compound, removes oxygen to create a negative pressure within a sealed inner volume, allowing for a low-profile, pump-less solution for wound care.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If active negative pressure dressings are used, then negative pressure is effectively applied to promote healing, but the dressing size becomes too large for facial areas

Engineering Contradiction:

Improvenegative pressure applicationVSAvoiddressing size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent replaces the active mechanical negative pressure system (pump and tubing) with a passive chemical system using oxygen scavenging materials. The oxygen scavenging layer consumes oxygen within the sealed dressing, creating negative pressure through chemical reaction rather than mechanical suction, enabling small facial dressing sizes while maintaining effective negative pressure application

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameter from active mechanical suction to passive chemical oxygen consumption. By controlling the oxygen scavenging rate and amount of oxygen-consuming material, the system achieves effective negative pressure (50-150 mmHg) without requiring the infrastructure of active pump systems, thus reducing dressing size for facial applications

Inventive Principle:

Principle #35Parameter changes

2Reliability

If active negative pressure systems with pumps and tubes are used, then negative pressure is maintained, but the device complexity increases

Engineering Contradiction:

Improvenegative pressure maintenanceVSAvoidpump and tube system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the complex active pump and tubing infrastructure from the negative pressure system. Only the essential components remain: a sealed film layer, oxygen scavenging material, and absorbent layer. This extraction eliminates mechanical complexity while preserving the core function of negative pressure maintenance through passive oxygen consumption

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The oxygen scavenging material autonomously generates negative pressure through its chemical reaction with oxygen, requiring no external power source, pump operation, or tube connections. The system serves itself by using the natural oxidation reaction to create and maintain negative pressure, eliminating all active mechanical components

Inventive Principle:

Principle #25Self-service

3Area of stationary object

If smaller dressings are used for facial areas, then the profile is lower and discretion is improved, but the ability to generate sufficient negative pressure is reduced

Engineering Contradiction:

Improvedressing sizeVSAvoidnegative pressure magnitude

Core Design Contradiction:

Area of stationary objectVSStress or pressure

Solution Approach 1:

The patent concentrates the oxygen scavenging function in a localized layer directly adjacent to the wound site, with the oxygen scavenging material positioned in optimal proximity to maximize pressure generation within the small facial dressing area. The absorbent layer is also strategically positioned to enhance the pressure gradient locally at the wound interface

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs a composite multi-layer structure combining the film layer, oxygen scavenging layer, absorbent layer, and patient interface layer. This composite design integrates multiple functions (sealing, oxygen consumption, fluid absorption, and pressure generation) into a compact unit that achieves sufficient negative pressure magnitude within a small facial footprint

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 generates a negative pressure of 50 mmHg to 150 mmHg, promoting wound closure and healing without the need for pneumatic tubing or electrical power, offering a discreet and efficient therapy delivery.

Implementation Method 1

The oxygen scavenging layer is configured to remove oxygen from within the inner volume of the oxygen scavenging dressing to draw a negative pressure within the oxygen scavenging dressing

Methodology Applied

Scientific EffectOxygen scavenging: Oxidation

Implementation Method 2

The oxygen scavenging layer includes a chemical substance configured to remove oxygen from within the inner volume. The chemical substance is an iron compound.

Methodology Applied

Scientific EffectChemical reaction: Redox Reactions

Data Source

PatentUS20240074914A1Passive negative pressure dressing

Publication Date: 2024.03.07 KCI MFG UNLIMITED CO

AI summary

An oxygen scavenging dressing includes a patient interface layer, an absorbent layer, a foam layer, an oxygen scavenging layer, and a film layer. The film layer is configured to seal with a patient's skin and define an inner volume within which the patient interface layer, the absorbent layer, the foam layer, and the oxygen scavenging layer are positioned.