Hydrogel Dressing Release Element for Liner Removal
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Solution Overview
Problem
Conformable hydrocolloid dressings, particularly in an island format, face challenges with liner lock-up due to shrinkage and elastic recovery, leading to increased peel forces that can damage the dressing during application and removal, making it difficult to remove without distortion.
Innovation Solution
Incorporating a release element along the edge of the hydrogel pad proximate the area where it separates from the release liner minimizes shear forces, reducing the peel force required for liner removal and preventing irreversible distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hydrogel pad is made conformable with adhesive properties, then it can adhere well to the skin and provide a secure dressing, but the peel force required to remove the release liner increases significantly, causing liner lock-up and potential damage to the dressing
Solution Approach 1:
The release liner is segmented into multiple sections: a first portion covering part of the hydrogel pad, a second portion covering another part, and a third portion extending beyond the edges. This segmentation allows different portions of the liner to be removed at different times and with different forces, preventing simultaneous high peel forces across the entire interface that would cause liner lock-up
Solution Approach 2:
The dressing is designed with specific structural features (such as the extended third portion of the release liner and the relationship between the hydrogel pad and liner portions) that prepare the system for easy removal before application. The design anticipates the removal action and structures the components to facilitate low-force separation, preventing liner lock-up during the removal process
2Strength
If the hydrogel pad has high adhesive strength to ensure secure bonding, then the dressing remains firmly attached during wear, but the shear forces during release liner removal cause separation of the adhesive hydrogel from the backing layer or irreversible distortion
Solution Approach 1:
By dividing the release liner into multiple portions that can be removed sequentially rather than simultaneously, the shear forces that would otherwise act on the adhesive-hydrogel-backing interface are distributed and reduced. This prevents separation of the adhesive hydrogel from the backing layer while maintaining strong adhesive bonding during wear
Solution Approach 2:
The segmented release liner structure acts as an intermediary element between the hydrogel pad and the external environment. The specific configuration of liner portions (first, second, and third portions) mediates the removal process, allowing the high-strength adhesive bond to be maintained during wear while enabling low-stress removal that preserves structural integrity
3Ease of operation
If the release liner is removed completely to apply the dressing, then full adhesive contact is achieved, but the elastic recovery and shrinkage of the hydrogel create high peel forces that make complete removal difficult and may cause irreversible distortion
Solution Approach 1:
The release liner is divided into portions that can be removed in sequence. The third portion extending beyond the edges allows for gradual removal starting from the edges, reducing the cumulative peel force that would otherwise build up across the entire adhesive interface, thereby preventing irreversible distortion
Solution Approach 2:
The design of the release liner with its specific portions and extensions prepares the system for easy removal by creating natural starting points (edge extensions) and distributing the peel force throughout the removal process. This preliminary structural arrangement counteracts the elastic recovery and shrinkage forces that would otherwise create high peak peel forces
Data Source
AI summary
An adhesive hydrogel dressing as well as methods of applying the dressing to a patient. The dressing generally comprises an adhesive hydrogel pad, a backing layer, and an adhesive layer on the backing layer facing the hydrogel pad. The adhesive layer and backing layer form a perimeter around the hydrogel pad and hold the hydrogel pad in place on an application surface. A release element is in contact with at least a portion of the edge of the hydrogel pad proximate the area that the hydrogel pad and release liner separate during liner removal.