Integrated Dissolution System with Interchangeable Carousels
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Solution Overview
Problem
Conventional dissolution testing systems face issues with large-volume sample transfer leading to secondary dissolution, hydrodynamic disruption, contamination risks, and the inability to handle diverse dosage forms in a single test run without modification.
Innovation Solution
An integrated dissolution processing and sample transfer system featuring a dose carrier with interchangeable carousels for tablets and baskets, a drive head with cannulae and a mixing paddle, and an automated pipettor for precise sample handling and transfer, allowing for simultaneous testing of various dosage forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large-volume samples (10 ml) are transferred using pumps and tubing, then sample transfer is achieved, but secondary dissolution occurs resulting in inaccurate dissolution rate values
Solution Approach 1:
The invention extracts only the necessary portion of the sample (small volume aliquot) from the dissolution vessel using an automated pipettor, rather than transferring large volumes through tubing. This eliminates the secondary dissolution problem while obtaining sufficient sample for analysis.
Solution Approach 2:
The automated pipettor acts as an intermediary device that bridges the dissolution vessel and analytical equipment, enabling precise small-volume sample transfer without the harmful effects associated with traditional large-volume pump-and-tubing systems.
2Productivity
If large-volume samples are withdrawn at typical transfer rates (10 ml per minute), then sample transfer is completed, but vessel hydrodynamics are disrupted for the entire transfer duration
Solution Approach 1:
The invention extracts only small-volume aliquots (e.g., 100-500 microliters) instead of large volumes, reducing the transfer time from one minute to seconds. This minimizes hydrodynamic disruption while maintaining adequate sampling for analysis.
Solution Approach 2:
The invention uses partial action by withdrawing only the minimum necessary sample volume required for analysis, rather than transferring excessive volumes. This partial sampling approach suffices for HPLC and spectral analysis while preserving vessel hydrodynamics.
3Quantity of substance
If multiple large samples are withdrawn from the test vessel, then sufficient samples for analysis are obtained, but the sample media must be replenished to maintain adequate volume for proper agitation
Solution Approach 1:
The invention uses disposable pipette tips on the automated pipettor for each sample transfer, eliminating the need to replenish large volumes of media. Each tip is used once and discarded, preventing carryover while maintaining constant media volume in the dissolution vessel.
Solution Approach 2:
Multiple small-volume aliquots are extracted sequentially from the same dissolution vessel without depleting the media volume. This enables multiple time-point sampling while maintaining constant hydrodynamic conditions and eliminating media replenishment requirements.
4Ease of operation
If tubing is used to transfer samples, then sample transfer is achieved, but purging is required after each transfer risking carryover contamination
Solution Approach 1:
The invention employs disposable pipette tips that are discarded after each sample transfer. This eliminates the carryover contamination risk inherent in reusable tubing systems, as each tip is used only once and then discarded, ensuring no residual sample remains.
Solution Approach 2:
The automated pipettor with disposable tips serves as an intermediary that transfers samples without requiring purging operations. The system maintains reliability by using fresh tips for each transfer, eliminating the contamination pathway present in tubing systems.
5Measurement precision
If prior art systems are configured for specific dosage form types, then optimized testing for that type is achieved, but the system cannot handle different dosage forms within a single run without modification
Solution Approach 1:
The dissolution testing system is designed with universal fixtures and an automated pipettor that can handle multiple dosage form types (tablets, capsules in baskets, sinkers) within a single run. The system performs multiple functions without requiring modification, allowing mixed dosage form testing while maintaining optimized measurement precision for each type.
Solution Approach 2:
The system employs dynamic, interchangeable fixtures and accessories that can be quickly changed between different dosage form types. The automated pipettor and vessel configuration can adapt to different testing requirements, enabling the system to handle diverse dosage forms with equal proficiency within the same run.
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 system minimizes secondary dissolution, reduces contamination, and enables efficient handling of multiple dosage forms in a single run, providing accurate and uniform dissolution testing results.
Implementation Method 1
the vessel contents are agitated at a specified speed
Implementation Method 2
A drive head is positioned above the dose carrier... providing accurate and uniform dissolution testing results
Data Source
AI summary
The invention provides a system and method for dissolution testing. The system includes multiple dissolution vessels and a dose carrier positioned above the dissolution vessels. The dose carrier holds multiple removable carousels that receive individual doses for dissolution tested. Carousels that receive tablets or sinkers typically have a first configuration, while carousels that receive baskets typically have a second configuration. The two different configurations of carousels are interchangeable on the same dose ring. The system further includes a drive head positioned above the dose carrier, the drive head having a basket arbor and a mixing paddle removably and interchangeably attached. A pipettor integral with the system transfers sample aliquots having volumes in the range of 50 μl to 1 ml from the dissolution vessels to wells of an external receptacle.