Negative Pressure Wound Therapy Dressing Seal

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Solution Overview

Problem

Existing negative-pressure wound therapy systems face challenges in creating an effective and air-tight seal between the dressing and the surrounding tissue, leading to potential leaks and reduced therapy efficacy.

Innovation Solution

The proposed system includes a dressing with a cover comprising multiple layers such as a stand-off layer, microsphere layer, film layer, bonding adhesive layer, and sealing adhesive layer. These layers work together to create a secure seal by manifold fluid across the cover and embedding microspheres into adhesive upon application of force, preventing fluid flow and enhancing adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single-layer adhesive dressing is used, then the device complexity is low, but the sealing reliability is insufficient leading to leaks

Engineering Contradiction:

Improvesealing reliabilityVSAvoiddressing structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dressing cover is divided into multiple functional layers: a stand-off layer with surface features for initial contact, a microsphere layer with dual-tack adhesive for sealing, and a bonding adhesive layer for attachment. This segmentation allows each layer to perform its specific function optimally, creating a reliable multi-stage seal while managing complexity through functional specialization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dressing employs a composite structure combining different materials with distinct properties: a porous stand-off layer for fluid distribution, a microsphere layer with pressure-sensitive adhesive characteristics, and a bonding layer for secure attachment. This composite approach integrates the advantages of each material to achieve both reliability and controlled complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If negative pressure is applied immediately, then the therapy effectiveness is maximized, but the seal may fail due to air leaks

Engineering Contradiction:

Improvetherapy effectivenessVSAvoidseal integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The microsphere layer is designed to create a preliminary seal at ambient pressure before negative pressure therapy begins. The dual-tack adhesive mechanism forms an initial barrier that prevents air leaks, allowing the system to then transition to effective negative pressure application without compromising seal integrity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The stand-off layer with its surface features provides a cushioning interface that distributes pressure evenly during the sealing phase. This prevents premature failure of the seal when negative pressure is subsequently applied, cushioning the transition and maintaining reliability during therapy initiation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the adhesive bond strength is high, then the seal is secure, but the removal may cause tissue damage

Engineering Contradiction:

Improveseal securityVSAvoidtissue damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bonding adhesive layer is positioned specifically at the periphery of the dressing where it contacts intact skin, creating a strong seal without requiring high adhesion at the tissue interface. The microsphere layer provides localized sealing at the wound boundary, while the central tissue interface maintains a gentler bond to prevent damage during removal.

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 system achieves a robust and reliable seal, reducing leaks and enhancing the effectiveness of negative-pressure wound therapy by maintaining negative pressure and promoting tissue healing.

Implementation Method 1

The microsphere layer and the plurality of surface features of the stand-off layer can be configured to manifold fluid across the cover

Methodology Applied

Scientific EffectFluid manifolding:

Implementation Method 2

The bonding adhesive layer can include a first surface adjacent to the second surface of the film layer and a second surface opposite the first surface

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 3

reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Data Source

PatentUS20250177633A1Negative pressure wound therapy system

Publication Date: 2025.06.05 SOLVENTUM INTELLECTUAL PROPERTIES CO

AI summary

Apparatuses, systems, and methods for providing negative-pressure wound therapy are described. The system for treating a tissue site with negative-pressure includes a dressing and a dressing interface. The dressing includes a cover and a tissue interface. The cover includes a stand-off layer, a microsphere layer, a film layer, a bonding adhesive layer, and a sealing adhesive layer. The tissue interface includes a first surface with a film and a second surface positioned proximate to the tissue site. The dressing interface is configured to couple to the dressing. The dressing interface includes a first chamber, a first piercing element disposed in the first chamber, a second chamber, and a second piercing element disposed in the second chamber. The dressing interface is configured to draw fluid from the first chamber at a first predetermined pressure and to draw fluid from the second chamber at a second predetermined pressure.