Transdermal Patch Information Layer Nesting for Durability
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Solution Overview
Problem
Transdermal application systems (TDS) face challenges with abrasion-resistant and secure information layers, as existing printing inks lack durability and can interact unfavorably with active ingredients, leading to illegibility and potential safety issues, while counterfeiting poses a significant threat requiring reliable identification.
Innovation Solution
A TDS design with an at least partially transparent backing layer and an information layer positioned between the backing layer and the storage layer, utilizing optically readable data and secure features like holograms or 2D codes, printed with abrasion-resistant inks that maintain visibility under mechanical stress and exposure to solvents, ensuring secure identification and authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If printing inks are used on the outer backing layer of TDS, then information can be provided for identification and branding, but the printing lacks abrasion resistance and can be worn down to illegibility during storage and use
Solution Approach 1:
The information layer is moved from the outer surface of the backing layer to an intermediate position between the backing layer and the storage layer. This spatial repositioning protects the information from direct mechanical abrasion while maintaining visibility through the transparent backing layer.
Solution Approach 2:
The information layer is nested within the multi-layer structure of the TDS, specifically positioned between the backing layer and storage layer. This nesting provides structural protection while integrating the information layer into the overall device architecture.
2Loss of information
If printing inks are applied to the outer backing layer, then branding and identification are possible, but the inks may interact unfavorably with active ingredients causing safety issues
Solution Approach 1:
The backing layer serves as an intermediary barrier between the information layer (containing printing inks) and the storage layer (containing active ingredients). This physical separation prevents direct chemical interaction while allowing optical transmission of the information.
Solution Approach 2:
The information layer is repositioned to a different spatial dimension within the TDS structure, placing it in the intermediate zone between the backing layer and storage layer. This spatial separation eliminates harmful chemical interactions while preserving information visibility through the transparent backing layer.
3Reliability
If the backing layer is made opaque to protect the information layer, then abrasion resistance improves, but the information becomes less visible through the backing layer
Solution Approach 1:
The information layer is positioned in the intermediate zone between the backing layer and storage layer, allowing visibility through the transparent backing layer while providing protection from the storage layer side. This spatial arrangement resolves the contradiction between protection and visibility.
Solution Approach 2:
The information layer is nested within the multi-layer structure at an intermediate position, protected by both the backing layer and storage layer while remaining visible through the transparent backing layer. This nested configuration provides dual protection without compromising visibility.
Data Source
AI summary
The invention relates to a transdermal application system (100) which has at least one flat active ingredient-containing storage layer assembly (1) with an application face (2) and a rear face (3), optionally a protective film (4) which faces the application face (2) of the storage layer assembly (1), and a rear layer (5) which faces the rear face (3) of the storage layer assembly (1). The rear layer (5) is at least partly transparent, and at least one information layer (6, 6') is located between the rear layer (5) and the storage layer assembly (1). The invention further relates to a method and a device (300) for producing the transdermal application systems (100) according to the invention and to the use of such a transdermal application system (100).