Multi-Layer Coating System for Controlled Drug Release
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Solution Overview
Problem
Current transdermal drug delivery systems face challenges such as the stratum corneum barrier, requiring high drug doses and potential uncontrolled release due to defects in rate-controlling membranes, and limitations in delivering active ingredients trapped within metal oxide matrices.
Innovation Solution
A multi-layer coating system with an inner reservoir layer containing higher active ingredient concentrations and an outer diffusion barrier layer, utilizing metal oxides and polymers to facilitate sustained and controlled release, while maintaining biocompatibility and preventing excessive drug release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a rate-controlling polymer membrane is used for controlled release, then consistent drug delivery over extended period is achieved, but sudden uncontrolled release occurs if the barrier is disrupted or defects are present
Solution Approach 1:
The invention divides the delivery system into multiple functional layers: a reservoir layer containing the drug and a separate rate-controlling membrane layer. This segmentation isolates the drug from direct contact with the membrane, reducing the risk of uncontrolled release through membrane defects while maintaining consistent delivery through the rate-controlling membrane's controlled porosity and structure.
Solution Approach 2:
The reservoir layer acts as a buffer or cushion between the drug and the rate-controlling membrane. Even if the membrane develops defects or is disrupted, the reservoir layer provides a barrier that prevents sudden uncontrolled release, ensuring more reliable and consistent drug delivery over the intended duration.
2Reliability
If a solid matrix delivery system is used to reduce leakage, then uncontrolled release is minimized, but drug delivery efficiency decreases due to trapped active ingredients
Solution Approach 1:
The rate-controlling membrane is designed with controlled porosity, allowing drug molecules to diffuse through at a consistent rate. This porous structure prevents uncontrolled release while maintaining high drug delivery efficiency, resolving the contradiction between reliability and productivity by providing both control and efficient transport pathways.
Solution Approach 2:
The invention uses a composite structure combining a drug-containing reservoir layer with a rate-controlling membrane layer. This composite material system leverages the advantages of both components: the reservoir provides reliable drug containment while the membrane enables controlled but efficient drug release, achieving both reliability and productivity.
3Quantity of substance
If high drug concentration is used to overcome skin barrier, then therapeutic effect is achieved, but skin permeability barrier is impaired due to surfactant action
Solution Approach 1:
The rate-controlling membrane acts as an intermediary between the high-concentration drug reservoir and the skin. It controls the drug release rate to prevent surfactant-induced barrier impairment while maintaining sufficient drug concentration at the skin surface to achieve therapeutic effects, thus resolving the contradiction between quantity and harmful effects.
Solution Approach 2:
The invention changes the concentration parameter along the delivery path: high concentration in the reservoir, gradually decreasing through the membrane, and controlled concentration at the skin surface. This parameter gradient allows achieving therapeutic effect while minimizing skin barrier impairment from excessive surfactant concentration.
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
Enhances the delivery of active ingredients by prolonging release rates and preventing uncontrolled drug release, maintaining therapeutic efficacy and biocompatibility, and allowing for longer sustained release through optimized tissue contact and cellular adhesion.
Implementation Method 1
an outer diffusion barrier layer, utilizing metal oxides and polymers to facilitate sustained and controlled release
Implementation Method 2
Metal oxide based delivery systems have been described in a past patents... the drugs or active ingredients are distributed within a matrix of metal oxides
Data Source
AI summary
Systems and methods for keeping various compounds stable in different ampoules in an applicator. Upon breaking open the ampoules, the compounds are mixed and applied. In one embodiment, the resulting mixture is a long lasting waterproof sunscreen for use on skin. In another embodiment, the resulting mixture applied one or more coatings to an article and may subsequently accomplish sustained release and/or transdermal deliver of a therapeutic.