Flexible Membrane GI Simulator for Dosage Disintegration
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Solution Overview
Problem
Current methods for assessing the disintegration of dosage forms in the gastrointestinal tract, such as the TNO Ingestion Model (TIM), primarily focus on mimicking environmental parameters rather than mechanical parameters, which are crucial for understanding the disintegration process.
Innovation Solution
A device with a pressurizable compartment and controlling means is used to simulate the gastrointestinal tract by varying the volume of a cell surrounding the dosage form, allowing for controlled mechanical forces and fluid mechanics similar to physiological conditions, using a flexible wall that can be compressed and relaxed by introducing or withdrawing gas or liquid, thereby replicating the mechanical conditions of the GI tract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TNO Ingestion Model (TIM) is used to simulate gastrointestinal conditions, then environmental parameters such as pH, temperature, and chemical composition can be mimicked, but mechanical parameters such as peristaltic movements, wall contraction forces, and mixing actions are insufficiently represented
Solution Approach 1:
The patent applies the dynamics principle by transforming the static chamber walls of traditional GI simulation models into dynamic, flexible membranes that can be actively deformed. The flexible membrane in the test chamber can be compressed, expanded, and deformed in various directions to simulate peristaltic movements and wall contractions. This dynamic capability allows the system to reproduce realistic mechanical forces and mixing actions that were previously absent in static simulation models, thereby improving both reliability of simulation and adaptability to different mechanical conditions.
2Ease of operation
If flexible membranes are used to simulate peristaltic movements in existing models, then some mechanical mixing is achieved, but controlled variation of mechanical parameters such as force, frequency, and amplitude is limited
Solution Approach 1:
The patent employs pneumatic and hydraulic principles by using a fluid pressure system to control the deformation of the flexible membrane. A fluid delivery system with controllable pumps or pressure sources applies varying pressures to different regions of the membrane, enabling precise control over the amplitude, frequency, and pattern of mechanical deformations. This approach provides ease of operation through programmable pressure control while managing device complexity by using well-established fluid control mechanisms rather than complex mechanical actuators.
Solution Approach 2:
The system implements parameter changes by allowing independent adjustment of multiple mechanical parameters including force magnitude, deformation frequency, amplitude, and wave propagation speed. The controlling means can vary these parameters dynamically during experiments to simulate different gastrointestinal conditions (e.g., fasting vs. fed state, different digestive phases). This capability enables systematic study of dosage form disintegration under controlled mechanical variations without requiring complete system redesign for each parameter set.
3Strength
If rigid chambers are used in existing GI models, then structural stability is maintained, but realistic mechanical forces and fluid dynamics similar to the GI tract cannot be reproduced
Solution Approach 1:
The patent replaces rigid chamber walls with flexible membranes or thin-walled structures that can deform while maintaining structural integrity. These flexible shells are designed with appropriate material properties to withstand repeated cyclic deformations while transmitting realistic mechanical forces to the dosage form and surrounding fluid. The flexible membrane acts as an active element that can be deformed by fluid pressure or mechanical actuators, creating realistic peristaltic waves and mixing patterns while preserving sufficient structural stability to contain the test environment.
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
This approach enables a more accurate simulation of the GI tract environment, allowing for the controlled study of dosage form disintegration under realistic mechanical conditions, improving the reproducibility and accuracy of assessing the release of components from dosage forms.
Implementation Method 1
Deformation between the two states of the wall is accomplished by introducing a gas or a liquid into the pressurizable compartment, or by withdrawing a gas or a liquid out of the pressurizable compartment
Implementation Method 2
Due to the deformation of the wall, the volume of the cell changes; the introduction of a gas or a liquid into the pressurizable compartment results in a reduction of the volume of the cell, and the sucking of a gas or a liquid out of the pressurizable compartment results in an increase of the volume of the cell. As a result of the decrease or the increase of the volume in the cell, the fluid present in the cell will be pressed out of the cell and drawn into the cell, respectively
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3f
AI summary
The invention relates to a device for assessing the disintegration of a dosage form in the gastrointestinal tract, comprising a wall surrounding a cell for being filled with a fluid and for receiving the dosage form, further comprising a pressurizable compartment arranged exterior to the wall for repeatedly deforming the wall between a first state and a second state wherein the volume of the cell in the first state is larger than in the second state, wherein the device also comprises controlling means for quantitatively controlling a fluid flow from and into the cell, and/or for quantitatively controlling a contact force that the wall exerts on the dosage form.