Floating Microgranules for Gastric Residence
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Solution Overview
Problem
Current floating pharmaceutical forms, such as tablets and capsules, face challenges with gastric emptying variability, leading to inconsistent bioavailability and therapeutic effects due to their monolithic structure and reliance on acidic/basic agent mixtures for effervescence, which can be unstable and hinder flotation.
Innovation Solution
Development of floating microgranules with a core-shell structure, where the active ingredient is supported on a solid core and an alkaline agent generates gas release upon contact with stomach fluids, eliminating the need for acidic agents and ensuring stable, prolonged flotation and drug release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If monolithic floating forms (tablets/capsules) are used, then gastric residence time is extended, but gastric emptying variability increases and bioavailability becomes inconsistent
Solution Approach 1:
The patent divides the monolithic floating form into multiple microgranules (0.5-2.5 mm diameter). Each microgranule floats independently, creating a collective floating mass that extends gastric residence time while the small individual size allows more consistent gastric emptying, thereby improving bioavailability reliability.
2Object-generated harmful factors
If acidic and basic agents are mixed for effervescence, then gas generation occurs, but formulation stability decreases and manufacturing complexity increases
Solution Approach 1:
The effervescent system is segmented into separate acidic and basic components within the microgranule structure. The basic agent (e.g., magnesium carbonate, calcium carbonate) is incorporated into the microgranule matrix, while the acidic agent (e.g., citric acid, tartaric acid) is applied as a coating layer, preventing premature reaction and improving formulation stability.
Solution Approach 2:
Different regions of the microgranule have different compositions: the core contains the basic agent and active ingredient, while the outer coating contains the acidic agent. This local differentiation allows the components to remain stable during manufacturing and storage, then react efficiently upon contact with gastric fluids.
3Object-generated harmful factors
If large quantities of effervescent agents are used, then flotation is achieved, but microgranule size increases and absorption efficiency decreases
Solution Approach 1:
The patent optimizes the size parameter of microgranules to 0.5-2.5 mm diameter, which is small enough for efficient gastric emptying and absorption but large enough to maintain flotation. The effervescent agent dosage is precisely controlled to generate sufficient gas for flotation without excessive size increase.
Solution Approach 2:
The microgranules use composite materials combining the active ingredient, basic agent (e.g., magnesium carbonate, calcium carbonate), and acidic agent (e.g., citric acid, tartaric acid) in optimized ratios. This composite structure achieves effective flotation with minimal size increase, maintaining absorption efficiency.
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 microgranules achieve improved bioavailability and reproducibility of therapeutic effects by maintaining a consistent gastric residence time and reducing variability, while avoiding stability issues and the need for large effervescent agents, thus enhancing the absorption of active ingredients with narrow absorption windows.
Implementation Method 1
an alkaline agent which generates a gas release on contact with the stomach fluids
Implementation Method 2
floating microgranules... maintaining a consistent gastric residence time
Data Source
AI summary
The present invention relates to a floating granule containing a solid core whereon an active principle is mounted. Said floating granule also contains a compound capable of generating a gas evolution consisting of an alkaline agent.