Dynamic Gastrointestinal Tract Simulation System
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Solution Overview
Problem
Current in vitro models for simulating gastrointestinal dissolution and intestinal permeation of pharmaceutical compounds are inadequate due to static conditions, lack of biorelevant pH control, and inefficient permeation barriers, leading to biased data and poor absorption predictions.
Innovation Solution
A dynamic gastrointestinal tract simulation system with interconnected compartments mimicking the stomach and small intestine, featuring active pH control, fluid transfer, and a semi-permeable membrane for online permeation, allowing for continuous gastric and intestinal fluid dynamics and enhanced solute concentration monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static dissolution systems are used to obtain preliminary pre-clinical data, then the system complexity is low and ease of operation is high, but the measurement precision and reliability of bioavailability predictions are poor due to absence of dynamic pH conditions and dynamic concentrations of solubilizing substances
Solution Approach 1:
The patent implements dynamic pH control in the stomach compartment using automated acid/base addition systems that adjust pH in real-time based on pre-programmed profiles simulating fed or fasted states. The small intestine compartment dynamically generates bile salts and phospholipids through automated addition systems, creating time-varying concentrations of solubilizing substances. This dynamic environment accurately mimics physiological conditions, thereby improving bioavailability prediction accuracy.
Solution Approach 2:
The patent introduces automated control systems and monitoring devices as intermediaries between the operator and the dissolution process. These intermediaries include pH sensors, peristaltic pumps for fluid transfer, and automated addition systems for bile salts and phospholipids, which manage the complexity of maintaining dynamic physiological conditions without requiring manual intervention for each parameter adjustment.
2Reliability
If offline permeation devices are used to study dissolution and permeation, then the device complexity is low, but the reliability of permeation data is poor due to inability to simulate continuous dissolution and absorption processes
Solution Approach 1:
The patent merges the dissolution and permeation processes into a single integrated online permeation system. The semi-permeable membrane is directly incorporated into the small intestine compartment, allowing dissolved substances to continuously permeate into the absorptive compartment while dissolution occurs. This eliminates the need for separate offline permeation devices and enables continuous monitoring of both dissolution and permeation kinetics, significantly improving data reliability.
Solution Approach 2:
The system maintains continuous dissolution and permeation processes throughout the experiment. Fluid transfer systems continuously move simulated gastrointestinal fluids through the compartments, and the semi-permeable membrane continuously allows permeation of dissolved substances. This continuous action accurately reflects physiological conditions where dissolution and absorption occur simultaneously and continuously, rather than in discrete steps.
3Measurement precision
If static coupled dissolution/permeation in vitro models are used, then the ease of operation is high, but the measurement precision of dissolution kinetics is poor due to absence of dynamic luminal concentration conditions
Solution Approach 1:
The patent implements feedback control through automated monitoring of pH, fluid volumes, and permeation rates. pH sensors continuously monitor the stomach and small intestine compartments, and the automated control systems adjust acid/base additions and fluid transfer rates based on real-time measurements. This feedback mechanism maintains physiological accuracy while automating the complexity of dynamic condition management, improving dissolution kinetics measurement precision.
Solution Approach 2:
The system uses automated peristaltic pumps and fluid transfer systems that self-regulate flow rates and fluid distribution based on pre-programmed protocols. The automated addition systems for bile salts and phospholipids self-adjust concentrations to match physiological profiles. This self-service capability reduces manual operation requirements while maintaining high measurement precision for dissolution kinetics.
Data Source
AI summary
The present invention relates to a method of simulating the gastrointestinal dissolution and intestinal permeation of substances, comprises providing a dynamic gastrointestinal tract simulation system comprising at least two consecutive compartments of which a first compartment simulates the stomach and a second compartment simulates the duodenum, said second compartment comprising an outer vessel and an inner vessel mounted inside the outer vessel, said inner vessel having a wall comprising a grid structure and a semi-permeable or dialysis membrane mounted around said grid structure. Said gastrointestinal tract simulation system further comprising a fluid transfer system for transferring fluids into and from said at least two consecutive compartments. The method further comprises the step of introducing and dissolving a substance in fluids simulating the physiological fluids of the gastrointestinal tract present in the first compartment, transferring said fluids from the first compartment into said inner vessel, ensuring the flow of dissolved substance from said inner vessel by permeation through the semi-permeable or dialysis membrane, and removing the fluids from the said outer vessel.