Unit Dosage Form Drum Freezing for High-Throughput Lyophilization
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Solution Overview
Problem
Conventional processes for producing lyophilized oral and vial dosage forms are cumbersome and expensive, requiring large equipment and inefficient processing, which increases costs and is not adaptable for bulk manufacturing of dosage forms in various shapes, sizes, and amounts.
Innovation Solution
A system utilizing a horizontally mounted drum with specialized cavities for precise liquid deposition, combined with a cryogenic component for rapid freezing and a dryer for lyophilization, allowing for bulk production of solid unit dosage forms with controlled shapes and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional unit dose manufacturing processes are used with blister packs and vials, then individual dosage units can be produced and packaged, but the process becomes cumbersome, requires large expensive equipment, and increases manufacturing costs
Solution Approach 1:
The system segments the manufacturing process into distinct functional modules: a rotating drum with cavities for dosage form creation, a cryogenic freezing section, and a drying section. Each module performs a specific operation, allowing the complex process to be managed through modular components rather than a monolithic system.
Solution Approach 2:
The rotating drum serves multiple functions: it acts as a dispensing platform, a forming mold through its cavities, a freezing surface through thermal contact with the cryogenic section, and a transport mechanism. This multi-functionality eliminates the need for separate equipment for each operation.
2Quantity of substance
If conventional blister forming equipment is used for individual dosage units, then unit dosing is achieved, but the equipment footprint becomes large and costs increase
Solution Approach 1:
The invention merges multiple previously separate operations into a single integrated apparatus: the dispensing mechanism, forming molds, freezing chamber, and drying section are all combined in one continuous system. This consolidation reduces the overall equipment footprint while maintaining the ability to produce bulk quantities of dosage forms.
Solution Approach 2:
The system operates continuously with the drum rotating through all sections without interruption. Liquid formulation is dispensed, frozen, and dried in a continuous flow, eliminating the need for batch processing and associated equipment idle time, thereby increasing productivity in a compact footprint.
3Productivity
If individual blister packs and vials are processed separately, then unit dosing is achieved, but processing inefficiencies increase and manufacturing costs rise
Solution Approach 1:
The drum rotates continuously through the freezing and drying sections, with multiple cavities processing different dosage forms simultaneously at different stages. This parallel continuous processing eliminates the sequential batch processing time of conventional methods, significantly increasing productivity.
Solution Approach 2:
The cavities are pre-cooled to the freezing temperature before the liquid formulation is dispensed. This preliminary preparation ensures immediate freezing upon contact, reducing the freezing time and overall processing time for each dosage unit.
4Reliability
If conventional freezing and lyophilization processes are used for each unit, then therapeutic efficacy is preserved, but the process becomes cumbersome and costly
Solution Approach 1:
The system utilizes phase transitions of water in two stages: first, rapid freezing of the liquid formulation to ice in the cryogenic section, then lyophilization (sublimation) of the ice to water vapor in the drying section. These controlled phase transitions preserve therapeutic efficacy by preventing denaturation while simplifying the equipment design through natural physical processes.
Solution Approach 2:
The system controls the temperature parameter through the rotation speed and the thermal properties of the drum material. By adjusting the rotation speed and drum thermal conductivity, the freezing and drying parameters are optimized to preserve therapeutic efficacy without requiring complex separate control systems for each unit.
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
Enables high-throughput production of solid unit dosage forms with preserved therapeutic efficacy, reducing costs and minimizing the first-pass effect, while accommodating formulation-specific freezing rates and allowing for efficient packaging and storage.
Implementation Method 1
a cryogenic component operable for chilling the outer surface of the drum to a suitable temperature capable of rapidly freezing the liquid in the cavities to form a frozen unit
Implementation Method 2
A dryer may be provided for drying the collected frozen units to yield solid unit dosage forms having a low water activity level
Data Source
AI summary
Systems, methods, and materials are described for making solid unit dosage forms for administration of therapeutic and biotherapeutic agents, particularly dosage forms for various enteral, nasal, pulmonary, vaginal, topical, and other suitable non-injection delivery routes. Contact freezing methods may be used in conjunction with lyophilization or vacuum drying to process a liquid formulation and produce solid unit dosage forms having a high degree of structural stability while preserving the therapeutic activity of the included agents.