Transdermal System Cylindrical Separating Layer Adhesion
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Solution Overview
Problem
Transdermal therapeutic systems (TTS) face issues with premature detachment from the skin and active ingredient migration due to inadequate adhesion and mechanical stress during preclinical and clinical studies, especially when used on mini-pigs, and existing solutions like patches complicate analytical evaluations.
Innovation Solution
A transdermal system incorporating a cylindrical separating layer with an outer circumference that protrudes beyond the TTS, an impermeable backing layer, and a plaster that extends beyond the separating layer to prevent active ingredient migration and enhance adhesion, allowing for easier separation post-use for analytical evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an over-patch is used to improve adhesion, then adhesion strength is improved, but the TTS and over-patch cannot be separated after application
Solution Approach 1:
The system is divided into three separable segments: the TTS, the cylindrical separating layer, and the over-patch. The cylindrical separating layer acts as an intermediate segment that provides both adhesion improvement and separability. This segmentation allows the TTS to be securely attached during use while enabling easy separation for analytical evaluation after use.
Solution Approach 2:
The cylindrical separating layer serves as an intermediary element between the TTS and the over-patch. It mediates the interaction by providing a surface for the over-patch to adhere to while preventing direct contact between the over-patch and the TTS backing layer, thus enabling both strong adhesion and easy separation.
2Reliability
If an over-patch is used to protect from mechanical stress, then mechanical protection is improved, but active ingredient migration into the over-patch occurs
Solution Approach 1:
The cylindrical separating layer acts as a barrier intermediary that prevents direct contact between the TTS backing layer edges and the over-patch adhesive layer. This intermediary structure blocks the migration pathway for active ingredients while still allowing the over-patch to provide mechanical protection through adhesion to the separating layer.
Solution Approach 2:
The potentially harmful interaction between the over-patch adhesive and the TTS backing layer edges is extracted or eliminated by introducing the cylindrical separating layer. This removes the source of active ingredient migration while preserving the beneficial mechanical protection function.
3Area of stationary object
If the TTS is designed for complete coverage, then adhesion coverage is improved, but separation for analytical evaluation becomes difficult
Solution Approach 1:
The system segments the adhesion function from the TTS itself by transferring it to the cylindrical separating layer. The TTS maintains its complete coverage design for optimal adhesion, while the separable cylindrical separating layer provides the interface for easy removal during analytical evaluation.
4Object-generated harmful factors
If the outer circumference of the separating layer is larger than the TTS, then edge contact with over-patch is prevented, but the separating layer must extend beyond the TTS edges
Solution Approach 1:
The cylindrical separating layer extends in the radial dimension beyond the TTS edges, creating a three-dimensional structure that prevents edge contact with the over-patch. This dimensional extension solves the problem of active ingredient migration while maintaining a practical geometric configuration.
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 effectively prevents premature detachment and active ingredient migration, improving adhesion and facilitating analytical evaluations by ensuring the TTS and patch can be separated, thus maintaining accurate data collection.
Implementation Method 1
the cylindrical separating layer is impermeable to the active ingredient
Implementation Method 2
the adhesive layer of the over-patch contacts the TTS within the area formed by the inner perimeter of the cylindrical separating layer, and the TTS adheres to the over-patch
Data Source
Figure 1~2
AI summary
The invention relates to a system comprising: a transdermal therapeutic system (TTS); a cylindrical separating layer having an outer periphery and an inner periphery; and a backing layer, which is applied to the cylindrical separating layer and protrudes beyond the cylindrical separating layer over the entire periphery. The invention further relates to a system for improving the adhesion of a TTS, to the use of said system, and to a kit containing said system.