High-density evaporative bridge dressing for negative-pressure wound therapy

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Solution Overview

Problem

Current negative-pressure wound therapy systems face challenges in providing effective fluid management and comfort, particularly for highly exuding wounds like venous leg ulcers, due to limitations in fluid transfer and dressing durability.

Innovation Solution

A high-density evaporative bridge dressing system comprising a contact layer with perforated silicone or non-adherent polyethylene film, a fluid bridge with high-density wicking layers, and a fluid interface connected to a flexible polymer conductor, designed for efficient fluid transfer and comfortable application, reducing pressure drops and extending pump life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional negative-pressure wound therapy systems are used, then fluid management is provided, but fluid transfer efficiency is insufficient and dressing durability is limited

Engineering Contradiction:

Improvefluid transfer efficiencyVSAvoiddressing durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The dressing is divided into multiple functional layers including a contact layer, occlusive layer, and bridge component with wicking material. This segmentation allows each layer to perform its specific function optimally, improving overall fluid transfer efficiency while maintaining dressing integrity and durability through specialized material properties in each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dressing combines multiple materials with different properties: adhesive-coated polyurethane film for occlusion, hydrophilic wicking material for fluid transport, and breathable membrane for vapor transmission. This composite structure enables efficient fluid management while enhancing dressing durability through the complementary strengths of each material.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If high fluid absorption is achieved, then fluid management improves, but pressure drops increase and pump life decreases

Engineering Contradiction:

Improvefluid absorption capacityVSAvoidpressure drop

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The system replaces purely mechanical fluid absorption with a combination of capillary action in the wicking material and evaporative transfer through the breathable membrane. This substitution reduces the pressure gradient required for fluid management, minimizing pressure drops and extending pump life while maintaining high fluid absorption capacity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The bridge component utilizes phase transition from liquid to vapor through the breathable membrane. This evaporative mechanism allows continuous fluid removal with minimal pressure differential, reducing energy loss and pump workload while achieving effective fluid management.

Inventive Principle:

Principle #36Phase transitions

3Productivity

If evaporative fluid transfer is enhanced, then fluid management efficiency improves, but patient comfort may be compromised

Engineering Contradiction:

Improveevaporative fluid transfer rateVSAvoidpatient comfort

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The bridge component is designed with localized high-density wicking material concentrated in the fluid transfer pathway, while the contact layer provides a soft, comfortable interface with the wound. This local quality differentiation enables high evaporative transfer efficiency in the bridge while maintaining patient comfort at the tissue interface.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The use of flexible breathable membranes in the bridge component allows the dressing to conform to body contours, ensuring patient comfort while maintaining the evaporative fluid transfer function. The thin film structure facilitates vapor transmission without compromising comfort or causing irritation.

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 system enhances patient comfort, extends dressing wear time, and reduces fluid volume collected, thereby improving wound healing and pump efficiency by facilitating high evaporation rates and minimizing pressure drops.

Implementation Method 1

The wicking layers can draw exudate and other fluid from a tissue site into the dressing and transfer the fluid to the fluid bridge

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

The intermediate layers can draw fluid through the bridge toward the fluid interface

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 3

high-density evaporative bridge dressing... facilitating high evaporation rates

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS12127916B2High-density evaporative bridge dressing

Publication Date: 2024.10.29 SOLVENTUM INTELLECTUAL PROPERTIES CO

AI summary

An evaporative bridge dressing that may be used with negative-pressure treatment of tissue. The evaporative bridge dressing may have one or more fluid transfer layers comprised of high-density wicking material enclosed between layers of film having high moisture-vapor transfer rates to reduce liquid storage and minimize pressure drop.