Duodenal Enteric Coating With pH and Lipase Triggers
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Solution Overview
Problem
Existing medicament delivery systems struggle to accurately and precisely target the duodenum in the gastrointestinal tract, often leading to premature dissolution before reaching the desired region, which can affect therapeutic efficacy and increase side effects.
Innovation Solution
A system comprising a mucoadhesive layer and an enteric coating that degrades in response to the pH and lipase environment of the duodenum, allowing for targeted delivery of medicaments, optionally with a needle delivery system for active administration, and includes a rigid material to protect the payload from stomach acid and ensure release in the duodenum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional enteric coating is used to protect the medicament in the stomach, then the medicament is protected from stomach acid, but the coating may dissolve prematurely before reaching the duodenum or dissolve too slowly to achieve rapid therapeutic effect
Solution Approach 1:
The enteric coating is divided into multiple functional layers: an outer layer comprising pH-degradable polymer and lipase-digestible material for protection and targeted dissolution, and an inner layer comprising mucoadhesive material for attachment. This segmentation allows each layer to perform its specific function optimally - the outer layer ensures protection until duodenum arrival while the inner layer ensures rapid attachment and dissolution at the target site.
Solution Approach 2:
The enteric coating uses composite materials combining pH-degradable polymers (such as Eudragit S100 or L100) with lipase-digestible materials (such as triglycerides or waxes). This composite structure provides both acid protection in the stomach and rapid dissolution in the duodenum where lipase is present, achieving precise dissolution timing control.
2Measurement precision
If the medicament is delivered to the duodenum, then targeted therapeutic effect is achieved, but the medicament may be diluted or degraded before reaching the target region
Solution Approach 1:
The mucoadhesive layer is pre-applied to the medicament core before the enteric coating, and the enteric coating is designed to dissolve rapidly upon reaching the duodenum. This preliminary preparation ensures that as soon as the coating dissolves at the target site, the medicament is immediately available for mucoadhesive attachment and rapid absorption, preventing dilution or degradation.
Solution Approach 2:
The mucoadhesive layer acts as an intermediary between the medicament and the duodenal wall. It provides a sticky interface that ensures rapid attachment of the medicament to the target tissue, preventing washout or dilution by gastrointestinal fluids and ensuring the medicament remains at the absorption site.
3Adaptability or versatility
If a gradient dissolution process is used, then small molecule medicaments can be absorbed at any point in the GI tract, but rapid dissolution at the targeted point cannot be achieved
Solution Approach 1:
The coating is designed with local quality variations - the outer layer provides acid resistance for stomach passage while the inner mucoadhesive layer provides rapid dissolution capability. The combination of pH-degradable polymer and lipase-digestible material creates a localized dissolution trigger that activates specifically in the duodenum environment, ensuring rapid dissolution at the target site rather than gradual dissolution throughout the GI tract.
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 system enables precise and controlled release of medicaments in the duodenum, reducing systemic side effects and enhancing therapeutic efficacy by ensuring accurate delivery to the target site.
Implementation Method 1
the enteric coating comprises at least a material degradable by a pH of the duodenum
Implementation Method 2
at least a material digestible by a lipase
Implementation Method 3
the mucoadhesive layer attaches the system for targeted delivery to a wall of the GI system
Data Source
AI summary
A system for targeted delivery of a medicament to the gastrointestinal tract (e.g., selectively to the duodenum) of a subject. The system includes a medicament, a mucoadhesive layer at least partially surrounding the medicament, and an enteric coating encasing the medicament and mucoadhesive layer. The enteric coating comprises a material degradable by a pH of the GI tract and a material digestible by a lipase. Also provided are method of making and using the system for targeted delivery of a medicament to the gastrointestinal tract. Also provided are a system for deploying a medicament-containing needle system using an expanding element. The system includes a medicament-containing needle system and an expanding element within a capsule. The capsule is initially coated with an enteric coating. As the enteric coating degrades the expanding element absorbs fluid that enters the capsule and expands to deploy the medicament-containing needle system from the capsule.