Two-Release-Liner Dressing for Wrinkle-Free Sterile Application

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Solution Overview

Problem

Existing thin adhesive dressings are difficult to handle and apply due to wrinkle formation and bacterial contamination risks during application, particularly in surgical settings.

Innovation Solution

A dressing design featuring two release liners, where the first liner is applied to the central portion and the second liner covers the edge portion, allowing step-wise application to prevent wrinkles and maintain sterility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a single release liner is used to cover the adhesive skin contact layer, then the dressing can be protected and handled, but the adhesive layer may still wrinkle and adhere to itself after release liner removal

Engineering Contradiction:

Improvehandling of thin adhesive dressingVSAvoidwrinkle-free application

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The release liner is divided into two separate release liners: a first release liner covering the central portion and a second release liner covering the edge portion. This segmentation allows independent removal and control of each region, preventing wrinkles at the edges while maintaining ease of handling during application.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the release liner is removed completely before application, then the adhesive layer can be applied to the skin, but the edges of the adhesive skin contact layer tend to curl

Engineering Contradiction:

Improveapplication of dressing to skinVSAvoidedge stability of adhesive layer

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The second release liner covering the edge portion is removed last, after the central portion has been applied to the skin. This preliminary application of the central portion stabilizes the dressing shape, and the subsequent removal of the second release liner prevents edge curling while completing the application.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the entire adhesive surface is exposed during application, then the dressing can be applied to the desired position, but bacterial contamination risk increases

Engineering Contradiction:

Improvepositioning of dressingVSAvoidbacterial contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The adhesive surface is segmented into central and edge portions covered by separate release liners. The first release liner can be partially removed to expose only the necessary central portion for positioning, while the second release liner maintains coverage of the edge portion, minimizing exposure time and contamination risk.

Inventive Principle:

Principle #1Segmentation

4Reliability

If a stiffener is added to prevent wrinkling, then the dressing becomes more rigid, but the thin and pliable property is compromised

Engineering Contradiction:

Improvewrinkle preventionVSAvoidpliability of adhesive layer

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The second release liner acts as an intermediary protective layer during handling and application. It prevents wrinkles and maintains the pliability of the thin adhesive layer without requiring additional stiffening materials, as the release liner itself provides the necessary structural support during the application process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12502316B2Dressing comprising a first and a second release layer

Publication Date: 2025.12.23 MOLNLYCKE HEALTH CARE AB

AI summary

A dressing includes a backing layer, an adhesive skin contact layer, and a first release liner. The adhesive skin contact layer has a central portion and an edge portion surrounding the central portion. The first release liner is configured to be releasably attached to at least the central portion of the adhesive skin contact layer. The dressing further includes a second release liner arranged between the first release liner and at least part of the edge portion of the adhesive skin contact layer.