Hollow Fiber Microdialysis Module for In-Vitro Release Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microdialysis methods for in-vitro release testing (IVRT) of dispersed dosage forms, particularly ophthalmic drug products, face challenges such as incomplete drug release, high costs, complexity in setup, and lack of robustness, which hinder their ability to achieve substantial or near-complete drug release within a shorter duration and are not compatible with compendial IVRT devices like USP Type 1/2 & Type 4.
Innovation Solution
A microdialysis system utilizing a hollow fiber module with a retentate chamber comprising a plurality of hollow fiber microtubular membranes, a media reservoir with temperature control, and a pump for recirculating dissolution media through the module, enhancing permeability and enabling near-complete drug release within a shorter duration, along with real-time monitoring and offline sample collection options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microdialysis methods are used for IVRT of dispersed dosage forms, then the setup is simple, but the drug release is incomplete and takes longer duration
Solution Approach 1:
The system segments the membrane interface into multiple hollow fiber microtubular membranes (total surface area 13-92 cm²) arranged in a bundle, replacing a single flat membrane. This segmentation dramatically increases the permeability area, enabling faster and more complete drug release from dispersed dosage forms while maintaining operational simplicity.
Solution Approach 2:
The invention transitions from a two-dimensional flat membrane interface to a three-dimensional bundle of hollow fiber microtubular membranes. This dimensional change provides a significantly larger surface area (13-92 cm²) for drug permeation, resolving the contradiction between release rate and completeness by offering extensive permeability area within a compact configuration.
2Productivity
If hollow fiber module with large permeability area is used, then drug release is faster and more complete, but the device complexity increases
Solution Approach 1:
The invention merges multiple hollow fiber microtubular membranes into a single integrated hollow fiber module with a standardized interface. This consolidation combines the complexity of multiple membranes into one replaceable unit, maintaining fast and complete drug release while simplifying system operation and compatibility with standard microdialysis apparatus.
Solution Approach 2:
The hollow fiber module is designed with a universal interface that maintains compatibility with standard microdialysis systems and compendial IVRT devices (USP Type 1/2/4). This multi-functionality allows the high-performance membrane bundle to integrate seamlessly into existing apparatus, reducing overall system complexity while achieving superior drug release performance.
3Area of stationary object
If conventional dialysis membrane is used, then the system is compatible with standard apparatus, but the permeability area is insufficient for complete drug release
Solution Approach 1:
The invention employs hollow fiber microtubular membranes with controlled porosity and molecular weight cut-off characteristics. These porous materials provide a total surface area of 13-92 cm² within the hollow fiber bundle, enabling sufficient drug permeation for complete release while maintaining the selective separation properties needed for reliable IVRT of dispersed dosage forms.
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 achieves faster and more complete drug release, facilitating frequent sampling and physiological relevant in-vitro testing, making it suitable for ophthalmic dosage forms and compatible with USP Type 1/2 & Type 4 apparatuses, thus addressing the limitations of existing methods.
Implementation Method 1
a retentate chamber comprising a plurality of hollow fiber microtubular membranes, with a total surface area of between 5 to 200 cm2, preferably a total surface area of between 13 to 92 cm2 wherein the drug is released from the dosage form into the retentate
Implementation Method 2
a pump connected to the media reservoir on one end and a hollow fiber module at the other end, wherein the pump is configured to pump the dissolution media from the media reservoir
Implementation Method 3
a first temperature controlling unit to maintain the temperature of the dissolution media wherein the media reservoir is kept in contact with the temperature controlling unit
Data Source
AI summary
The present invention relates to an improved microdialysis method utilizing an ultrafiltration module comprising of a plurality of hollow fiber microtubular membranes for In-Vitro Release Testing (IVRT) of dispersed dosage forms, such as but not limited to solutions, emulsions, suspensions, liposomes, nanodispersions, nanocrystals and polymeric nanocarriers. The invention further relates to a microdialysis based method providing an increase permeability area for faster release of an agent, which enables the substantial or near complete drug release in a shorter duration of time. The invention further relates to a system for in-vitro release testing of a dosage form with increased permeability area for faster release of an agent which enables the near complete or substantial release of a drug.