Multilayer Pharmaceutical Dosage Form Coating for Drug Release Control
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Solution Overview
Problem
Conventional single-layer film control technologies face challenges in achieving a precise and desired drug release profile, often resulting in a lag time in drug release.
Innovation Solution
A multilayer solid pharmaceutical sustained-release dosage form comprising a core with a first and second permeable and insoluble coating layer, where the coating layers contain a mixture of methacrylate copolymers and ethyl cellulose, allowing for precise control of drug release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer film control technology is used, then the structure is simple, but the drug release profile precision is poor and lag time occurs
Solution Approach 1:
The single-layer coating is divided into multiple functional layers: a first permeable coating layer with higher drug release rate and a second permeable coating layer with lower drug release rate. This segmentation allows each layer to control drug release at different stages, eliminating lag time and achieving precise sustained-release profiles.
Solution Approach 2:
Different regions of the coating structure are assigned different properties: the first coating layer has higher permeability for initial drug release, while the second coating layer has lower permeability for sustained release. This local differentiation enables precise control of drug release kinetics at different time points.
2Manufacturing precision
If a multilayer coating structure is used, then the drug release profile control precision is improved, but the device complexity increases
Solution Approach 1:
The coating is segmented into two functional layers with distinct permeability characteristics. The first layer provides higher permeability for initial release, while the second layer provides lower permeability for sustained release, achieving precise drug release control without excessive complexity.
Solution Approach 2:
The coating uses composite polymer materials with different permeability properties in each layer. This combination of materials with complementary characteristics enables precise control of drug release profiles while maintaining a manageable structural complexity.
3Ease of manufacture
If conventional single-layer coating is used, then the manufacturing process is simple, but the lag time in drug release occurs
Solution Approach 1:
The coating process is segmented into two sequential coating steps, each applying a layer with specific permeability characteristics. This segmentation eliminates lag time by ensuring drug release begins immediately through the first layer while the second layer provides sustained release, all within a manageable manufacturing process.
Solution Approach 2:
The first permeable coating layer is applied preliminarily to enable immediate drug release, preventing lag time. The second layer is then applied to provide sustained release control, ensuring the drug release profile begins without delay while maintaining precision.
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 multilayer dosage form effectively minimizes lag time in drug release and allows for precise control of the drug delivery rate, enabling a variety of release profiles to achieve a desired sustained-release profile.
Implementation Method 1
the first material is a high-permeability pH-independent swellable methacrylate copolymer, and the second material is a low-permeability pH-independent swellable methacrylate copolymer
Implementation Method 2
a first permeable and insoluble coating layer covering the core; a second permeable and insoluble coating layer covering the drug layer
Data Source
AI summary
Disclosed is a multilayer solid pharmaceutical dosage form, wherein a core containing an active ingredient is coated with a first sustained-release coating layer, a drug layer containing the active ingredient is applied onto the first layer, and a second sustained-release coating layer is applied onto the drug layer.