Coated Microparticles Pseudo-Zero-Order Release Kinetics
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Solution Overview
Problem
Current sustained-release pharmaceutical formulations face challenges in maintaining consistent drug levels over time, leading to reduced efficacy towards the end of the treatment period due to first-order release kinetics, and there is a need for improved parenteral administration methods that address issues like bioavailability and compliance.
Innovation Solution
Development of coated microparticles with a permeable polymeric coating that allows for sustained-release of active pharmaceutical ingredients, featuring a first polymeric coating that remains permeable until the active ingredient concentration is unsaturated, and an optional second coating that provides additional mechanical support and control over release kinetics through pore regions, enabling pseudo-zero-order release kinetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If sustained-release formulations use large particles of insoluble salts with first-order release kinetics, then the formulation can maintain drug delivery over an extended period, but the drug levels achieved at the end of the treatment period are significantly less than those achieved at the beginning
Solution Approach 1:
The patent changes the release kinetics parameter from first-order to pseudo-zero-order by using a saturated solution reservoir within microparticles. This maintains a constant concentration gradient driving force throughout the release period, ensuring consistent drug levels are achieved at both the beginning and end of treatment.
Solution Approach 2:
The patent utilizes the phase transition between solid drug and saturated solution within the microparticle reservoir. The drug is maintained in a saturated solution state, which provides a constant concentration gradient for diffusion-driven release, achieving pseudo-zero-order kinetics and consistent drug levels throughout the sustained release period.
2Productivity
If conventional sustained-release formulations are used, then administration frequency can be reduced, but bioavailability and compliance issues persist
Solution Approach 1:
The patent replaces mechanical/matrix-based release mechanisms with a diffusion-driven system based on saturated solution reservoirs. This substitution enables more reliable and consistent drug release kinetics, improving bioavailability while maintaining reduced administration frequency.
3Ease of operation
If micronized preparation is used as starting point with matrices or membranes for controlled release, then release can be controlled, but the system complexity increases
Solution Approach 1:
The patent applies local quality by creating microparticles with a specific internal structure - a saturated solution reservoir enclosed by a semi-permeable membrane. This localized saturated solution environment provides controlled release without requiring complex external matrices or multiple membrane layers, simplifying the overall formulation while maintaining release control.
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 coated microparticles achieve a sustained-release profile with improved kinetics, maintaining consistent drug levels over an extended period, reducing the need for frequent administration and enhancing bioavailability while minimizing the risk of non-compliance.
Implementation Method 1
the first polymeric coating is permeable to the active pharmaceutical ingredient during the sustained-release period from administration of the microparticles until the concentration of the active pharmaceutical ingredient contained within the microparticles is unsaturated
Implementation Method 2
the second polymeric coating defines pore regions which permit fluid communication between a pore portion of the first polymeric coating and the external environment, thereby allowing diffusion of the active pharmaceutical ingredient across the first polymeric coating in the pore regions
Data Source
AI summary
Coated microparticles for sustained-release of an active pharmaceutical ingredient after parenteral administration, and methods of producing such coated microparticles, are provided. The coated microparticles comprise core particles of an active pharmaceutical ingredient and a first polymeric coating on the core particles. The first polymeric coating is permeable to the active pharmaceutical ingredient forms a saturated solution within the coated microparticle, resulting in pseudo-zero-sustained release period. A second polymeric coating can be employed to add mechanical support or as a rate-controlling element.