Transdermal System Acrylic Silicone Adhesive Stability
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Solution Overview
Problem
Transdermal therapeutic systems (TTS) face issues with skin irritation and instability, particularly when using silicone gel adhesives, leading to damage during removal of the release liner and instability between adhesive layers.
Innovation Solution
A TTS design with an active agent-containing layer comprising an acrylic polymer, a skin contact layer with a silicone gel adhesive, and an intermediate layer, where the intermediate layer is a pressure-sensitive adhesive layer comprising a silicone-based polymer, providing stability and reducing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a silicone gel adhesive skin contact layer is used to reduce skin irritation, then skin irritation is reduced, but the connection between adhesive layers becomes unstable and the TTS can be damaged upon removal of the release liner
Solution Approach 1:
The patent introduces an intermediate layer comprising a pressure-sensitive adhesive between the silicone gel adhesive skin contact layer and the active agent-containing layer. This intermediate layer acts as a mediator that provides stable connection and mechanical support to the silicone gel adhesive layer, preventing damage upon release liner removal while maintaining the skin-friendly properties of the silicone gel adhesive.
Solution Approach 2:
The patent creates a composite adhesive structure by combining silicone gel adhesive (for skin compatibility) with a pressure-sensitive adhesive intermediate layer (for mechanical stability). This composite approach allows the system to simultaneously achieve reduced skin irritation through the silicone gel adhesive and stable connection through the pressure-sensitive adhesive layer.
2Reliability
If an intermediate layer is added to improve connection stability, then connection stability is improved, but the structure becomes more complex
Solution Approach 1:
The intermediate layer serves multiple functions simultaneously: it provides mechanical support to the silicone gel adhesive layer, ensures stable connection between layers, prevents damage upon release liner removal, and maintains adhesive performance. By combining multiple functions in a single layer, the patent minimizes structural complexity while achieving connection stability.
3Object-affected harmful factors
If the TTS uses acrylic polymer active agent-containing layer and silicone gel adhesive skin contact layer, then skin irritation is reduced, but adhesive properties deteriorate over time
Solution Approach 1:
The pressure-sensitive adhesive intermediate layer acts as a mediator that compensates for the limited adhesive duration of the silicone gel adhesive. This intermediate layer provides sustained adhesive performance over time, ensuring the TTS remains securely attached to the skin for at least 24 hours while the silicone gel adhesive layer continues to provide skin-friendly properties.
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 solution ensures high mechanical stability, effective drug delivery, and prolonged adhesive properties for at least 24 hours, preventing damage during release liner removal and maintaining therapeutic plasma concentrations of the active agent.
Implementation Method 1
a skin contact layer comprising a silicone gel adhesive
Implementation Method 2
transdermal administration of an active agent to the systemic circulation
Implementation Method 3
an intermediate layer between the active agent-containing layer and the skin contact layer
Data Source
AI summary
The present invention relates to a transdermal therapeutic system for the transdermal administration of an active agent comprising an active agent-containing layer structure, said active agent-containing layer structure comprising: A) a backing layer; B) an active agent-containing layer comprising at least one acrylic polymer; C) a skin contact layer; and wherein the skin contact layer is an adhesive layer comprising a silicone gel adhesive.