Three-Layer Separating Layer for Intestinal Drug Coatings
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Solution Overview
Problem
Existing pharmaceutical dosage forms with intestinal juice-soluble (meth)acrylate copolymer coatings experience permanent interactions between the active ingredient and the polymer layer, leading to unpredictable and unreproducible active ingredient release due to incomplete detachment of the polymer shell, affecting the reproducibility and timing of active ingredient release.
Innovation Solution
A dosage form design featuring a core covered with a gastric juice-resistant, intestinal juice-soluble (meth)acrylate copolymer coating and a three-layer separating layer, where two layers of film-forming, water-soluble polymer enclose an inner water-repellent substance, ensuring complete dissolution of the polymer coating before active ingredient release begins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer separating layer is used between the core and coating layer, then the structure is simple, but the polymer shell does not detach completely and permanent interactions occur between active ingredient and polymer layer
Solution Approach 1:
The separating layer is divided into three distinct layers: an inner layer with water-repellent substance and two outer layers with film-forming water-soluble polymer. This segmentation allows the inner layer to prevent permanent interactions while the outer layers ensure complete detachment of the polymer shell, resolving the contradiction between structural simplicity and release reliability.
Solution Approach 2:
The inner layer with water-repellent substance is nested within the two outer layers of film-forming water-soluble polymer. This nested structure enables the water-repellent inner layer to prevent interactions while being protected by the soluble outer layers that dissolve completely, achieving both complete detachment and prevention of permanent interactions.
2Duration of action of moving object
If the polymer coating dissolves slowly, then the active ingredient release is controlled, but the polymer shell does not detach completely and interactions occur
Solution Approach 1:
The separating layer is segmented into three layers with different functional properties. The inner water-repellent layer prevents interactions while the two outer water-soluble polymer layers dissolve completely and quickly, ensuring complete detachment without permanent interactions while maintaining controlled release timing.
3Reliability
If the polymer shell detaches completely, then the active ingredient release is reproducible, but the separating layer structure becomes complex
Solution Approach 1:
The separating layer is segmented into three functional layers: inner water-repellent layer for preventing interactions, and two outer water-soluble polymer layers for complete detachment. This segmentation achieves complete detachment and reproducible release while maintaining a systematic and manageable structure.
Solution Approach 2:
The inner water-repellent layer is nested within the two outer water-soluble polymer layers. This nested configuration achieves complete detachment and prevents interactions through a compact, organized structure that balances functionality with structural complexity.
4Device complexity
If a two-layer separating layer is used, then the structure is simpler, but complete detachment of polymer shell is not ensured
Solution Approach 1:
The separating layer is segmented into three layers rather than two. This additional segmentation ensures complete detachment of the polymer shell by distributing the detachment function across two outer layers, while the inner water-repellent layer prevents interactions. The extra layer provides the precision needed for complete detachment.
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
This design ensures that the polymer coating dissolves completely in over 95% of pellets before active ingredient release, maintaining reproducibility and ensuring that the active ingredient and associated substances reach the site of action simultaneously, preventing premature separation and enzymatic degradation.
Implementation Method 1
two layers of film-forming, water-soluble polymer enclosing a layer with the water-repellent substance
Implementation Method 2
an inner layer with a water-repellent substance being present
Data Source
AI summary
The invention relates to a pharmaceutical form comprising an active ingredient-containing core which is enveloped by a coating of a (meth)acrylate copolymer which is resistant to gastric juice and soluble in intestinal juice, there being a separating layer comprising a film-forming water-soluble polymer present between core and coating layer, characterized in that the separating layer has an at least three-layer configuration, with two layers of the film-forming water-soluble polymer enclosing one layer with a water-repelling substance.