Hydrogel Polyurethane Wound Dressing for Breathable Healing

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Solution Overview

Problem

Current wound dressings fail to maintain an optimal environment for healing, as they lack breathability, moisture permeability, and bacterial resistance, and often cause skin allergies and adhesion issues, which can lead to prolonged healing times and increased infection risks.

Innovation Solution

A dressing comprising an inner hydrogel layer and an outer polyurethane film with a pressure-sensitive adhesive, forming an interpenetrating polymer network, which provides improved mechanical properties, reduced skin contact, and enhanced bacterial resistance, while maintaining moisture and breathability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If traditional dressings are used to cover wounds, then they provide basic protection, but they lack breathability and moisture permeability which prolongs healing time

Engineering Contradiction:

Improvehealing timeVSAvoidbreathability and moisture permeability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent employs a composite structure consisting of a hydrogel layer and a polyurethane film layer. The hydrogel layer provides moisture permeability and breathability to promote healing, while the polyurethane film layer provides mechanical strength and bacterial resistance. This composite material approach resolves the contradiction by combining materials with complementary properties.

Inventive Principle:

Principle #40Composite materials

2Reliability

If traditional adhesive dressings are used, then they stick to wound surface, but they cause skin allergies and adhesion issues when removed

Engineering Contradiction:

Improveadhesion to woundVSAvoidskin allergies and adhesion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies adhesive properties selectively to specific regions. The pressure-sensitive adhesive is applied only to the polyurethane film layer that contacts the surrounding skin, not to the hydrogel layer that contacts the wound bed. This local differentiation allows secure attachment to healthy skin while maintaining gentle contact with the wound surface, resolving the contradiction between adhesion and skin irritation.

Inventive Principle:

Principle #3Local quality

3Strength

If dressings with strong mechanical properties are used, then they have good tensile strength, but they may cause adhesion and desquamation when removed

Engineering Contradiction:

Improvetensile strengthVSAvoidadhesion and desquamation

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent divides the dressing into functionally distinct layers: a hydrogel layer for wound contact with moisture permeability and gentle adhesion, and a polyurethane film layer for mechanical strength and structural support. This segmentation allows each layer to perform its specific function without causing harm, resolving the contradiction between strength and tissue damage.

Inventive Principle:

Principle #1Segmentation

4Reliability

If dressings are designed to closely stick to wound surface, then they maintain wound environment, but they cause skin allergies and prolonged healing

Engineering Contradiction:

Improvewound environment maintenanceVSAvoidhealing time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The dressing creates different microenvironments through its layered structure. The hydrogel layer maintains a moist, breathable environment directly at the wound surface to promote healing, while the polyurethane film layer provides a protective barrier. This local environmental differentiation allows optimal wound conditions without causing skin irritation or prolonging healing.

Inventive Principle:

Principle #3Local quality

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 significantly reduces wound area, promotes faster healing, minimizes skin allergies, and effectively prevents bacterial invasion, leading to faster wound closure and reduced scarring.

Implementation Method 1

the inner layer comprises hydrogel and meltblown nonwoven

Methodology Applied

Scientific EffectHydrogel: Hydrogel

Implementation Method 2

forming an interpenetrating polymer network, which provides improved mechanical properties

Methodology Applied

Scientific EffectInterpenetrating polymer network: Composite Materials

Implementation Method 3

the outer layer comprises polyurethane film and pressure sensitive adhesive film

Methodology Applied

Scientific EffectPressure-sensitive adhesive: Adhesive

Data Source

PatentUS10159605B2Dressing

Publication Date: 2018.12.25 COMPOSE ELEMENT

AI summary

A dressing, comprising an inner layer and an outer layer; wherein the inner layer and the outer layer are aligned with trimming at one side of edge. The inner layer comprises hydrogel and meltblown nonwoven, and the outer layer comprises polyurethane film and pressure sensitive adhesive film. The dressing increases watertight closure. It could be applied in circular wound covering.