Ostomy Appliance Adhesive Wafer Release Liner Alignment
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Solution Overview
Problem
Existing ostomy appliances face challenges in aligning release liners correctly, leading to difficulties in adapting the adhesive wafer to the shape of the stoma, as incorrect alignment can mislead users and complicate the fitting process.
Innovation Solution
The ostomy appliance features a skin-facing adhesive layer covered by first and second release liners, where at least one liner has an attached part and a foldable part with a cutting guide printed on both, allowing for correct alignment regardless of liner symmetry, enabling users to unfold the foldable part and utilize the cutting guide for customizing the passage to the stoma shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two release liners are used to cover the adhesive surface, then the entire adhesive surface is protected, but aligning the two release liners correctly becomes difficult and error-prone
Solution Approach 1:
The release liner system is segmented into a first release liner and a second release liner, each covering different portions of the adhesive surface. The first release liner remains attached while the second release liner is folded back, allowing the cutting guide to be visible and used for accurate passage adaptation without alignment errors.
Solution Approach 2:
The second release liner is pre-folded back along a folding line before the user needs to use the cutting guide. This preliminary action ensures that the cutting guide on the second release liner is already in position and visible, eliminating the need for complex alignment operations during passage adaptation.
2Adaptability or versatility
If cutting guides are printed on both release liners, then users can use either liner for guidance, but incorrect alignment of the two cutting guides misleads the user
Solution Approach 1:
The second release liner is pre-folded back to reveal the cutting guide before the user performs passage adaptation. This ensures that the cutting guide is already in the correct position and orientation, providing accurate guidance for cutting the passage to match the stoma shape without requiring alignment of multiple cutting guides.
Solution Approach 2:
The folding line acts as an intermediary mechanism that controls the position and visibility of the cutting guide on the second release liner. By folding the liner back along this predetermined line, the cutting guide is automatically positioned correctly relative to the adhesive wafer, serving as a reliable guide for passage adaptation.
3Device complexity
If the release liners are symmetrically arranged, then the design is simple, but correct alignment requires high precision which is difficult to achieve
Solution Approach 1:
The release liner arrangement is made asymmetric through the folding mechanism. The first release liner remains attached in its original position while the second release liner is folded back along a folding line, creating an asymmetric configuration that eliminates alignment requirements. This asymmetric arrangement allows the cutting guide on the folded liner to be used without needing to align it with the first liner.
Data Source
Figure 1~2
Figure 3~4
AI summary
An ostomy appliance for attachment to a stoma, comprising an adhesive wafer ( 100 ) a first part of which is covered by a first release liner ( 104 ) and a second part of which is covered by a second release liner ( 106 ). At least one of the two release liners defines an attached part which in an initial state is attached to the skin facing adhesive layer ( 102 ), and a foldable part which in a folded state is folded such that it covers at least a part of the attached part and such that it is not in direct contact with the skin facing adhesive layer. A cutting guide ( 120 ) is printed onto the at least a part of the attached part and the foldable part.