Segmented Foam Wound Dressing for Exudate Management

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Solution Overview

Problem

Existing wound dressings struggle to maintain optimal moisture levels and intimate contact with the wound site, leading to bacterial growth, fluid accumulation, and delayed healing, especially in large wounds, as they fail to effectively manage exudate and promote balanced vascular and lymphatic circulation.

Innovation Solution

A wound dressing system that uses a vacuum pump to remove excess air and moisture, introducing fresh air and moisture while maintaining intimate contact with the wound site, utilizing a wicking material layer, a polyurethane foam core, and a semi-permeable film cover to control compression and tension, thereby enhancing epithelialization and wound closure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If thin foam is used to allow moisture retention and prevent adhesion, then patient comfort and ease of removal are improved, but the dressing cannot manage large amounts of exudate from large wounds, leading to fluid accumulation and bacterial growth

Engineering Contradiction:

Improveease of removalVSAvoidexudate management capacity

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The foam is divided into multiple thickness zones: a thinner region adjacent to the wound for moisture retention and epithelial advancement, and a thicker region extending away from the wound to absorb and manage large volumes of exudate. This segmentation allows the single dressing to simultaneously provide comfort during removal and adequate exudate management capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the foam have different thicknesses tailored to local requirements: the thin region near the wound prioritizes moisture retention and non-adherence for patient comfort, while the thick region farther from the wound prioritizes exudate absorption capacity. This local differentiation resolves the contradiction between ease of removal and exudate management.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the foam is made thinner to maintain intimate contact with the wound, then surface contact and epithelial advancement are improved, but the dressing loses contact stability in the presence of exudate, allowing bacteria to build up

Engineering Contradiction:

Improvesurface contact stabilityVSAvoidbacterial growth

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The foam's segmented thickness structure provides a thin contact region for stable surface contact and epithelial advancement while the thicker absorbing region manages exudate volumes. This prevents the thin foam from losing contact stability due to fluid accumulation, thereby preventing bacterial growth.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thicker foam region acts as an intermediary between the thin contact layer and the external environment, absorbing excess exudate before it can compromise the intimate contact between the thin foam and the wound surface. This intermediary function maintains contact stability while managing harmful fluid accumulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If compression is applied to stem lymph fluid outflow, then lymphatic circulation control is improved, but tissue swelling from edema accumulation occurs, slowing wound closure

Engineering Contradiction:

Improvewound closure speedVSAvoidedema and swelling

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The foam's gradient thickness provides varying degrees of compression: lighter compression at the thin wound-contact region to maintain lymphatic flow and prevent edema, and progressively stronger compression in the thicker regions to manage exudate. This segmented compression approach accelerates wound closure without causing harmful tissue swelling.

Inventive Principle:

Principle #1Segmentation

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

This system accelerates wound healing by balancing air and moisture levels, reducing bacterial growth, and minimizing edema, leading to faster reepithelialization and reduced infection risk, while maintaining contact without disrupting the wound site.

Implementation Method 1

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

A wound dressing system that uses a vacuum pump to remove excess air and moisture

Methodology Applied

Scientific EffectNegative pressure: Vacuum

Implementation Method 3

utilizing a wicking material layer, a polyurethane foam core, and a semi-permeable film cover to control compression and tension

Methodology Applied

Scientific EffectSemipermeable membrane: Semipermeable Membrane

Data Source

PatentUS10857038B2Externally-applied patient interface system and method

Publication Date: 2020.12.08 SOLVENTUM INTELLECTUAL PROPERTIES CO

AI summary

A surface-wound healing dressing for a wound or incision includes a slip drain located within the closed wound or incision. A wick is placed over the closed wound or incision in contact with the slip drain. A mat is placed over the wick and adapted for fluidic communication therewith. A recoil core includes a foam material and is adapted for placement on the mat. A wound healing method includes the steps of placing a slip drain, placing a wick over the slip drain, placing a recoil core over the wick and covering the recoil core with an overdrape. The overdrape is adapted for connection to an external negative pressure source, such as a vacuum.