Permeable Membrane for Aseptic Freeze-Drying
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Solution Overview
Problem
Heat-sensitive substances, such as biological and pharmaceutical materials, face contamination risks during freeze-drying due to exposure to contaminants during transportation and handling, leading to increased labor and costs associated with sterilization and repackaging.
Innovation Solution
A system utilizing selectively permeable membranes integrated into containers to allow solvent vapor escape while preventing liquid and contaminant entry, made from materials like PTFE with aseptic barrier properties, which can be securely fastened to the container neck or cap, ensuring aseptic conditions during freeze-drying, packaging, and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If open or partially stoppered containers are used during freeze-drying to allow solvent vapor removal, then the freeze-drying process can proceed effectively, but the heat-sensitive material is exposed to potential contamination
Solution Approach 1:
A flexible membrane is integrated into the container cap or stopper, allowing the membrane to flex and permit solvent vapor passage while maintaining a physical barrier against contaminants. The membrane's flexibility enables it to accommodate pressure changes during freeze-drying while maintaining its contaminant barrier function.
Solution Approach 2:
The membrane is designed with porous structure that allows selective passage of solvent vapor molecules while blocking larger contaminant particles and microorganisms. The pore size is optimized to permit vapor transmission necessary for freeze-drying while providing effective contamination protection.
2Object-affected harmful factors
If sterilization is performed on freeze-drying equipment to minimize contaminant exposure, then contamination risk is reduced, but labor and costs increase
Solution Approach 1:
The container with integrated membrane is designed as a single-use disposable unit. After one freeze-drying cycle, the entire container is discarded, eliminating the need for complex sterilization procedures on reusable equipment. This approach trades the cost of disposable containers for simplified equipment maintenance and reduced sterilization labor.
Solution Approach 2:
The membrane acts as an intermediary barrier between the heat-sensitive material and the external environment. By placing this controllable barrier directly on the material container, the system achieves contamination protection without requiring sterilization of the entire freeze-drying chamber and associated equipment.
3Ease of operation
If repackaging and re-handling of lyophilized materials is performed, then packaging requirements are met, but contamination opportunities increase and costs rise
Solution Approach 1:
The container is designed to fulfill multiple functions simultaneously: it serves as the freeze-drying vessel, provides contamination protection during processing, and acts as the final packaging for storage and distribution. By merging these functions into a single integrated container, the need for repackaging is eliminated, reducing both cost and contamination risk.
Solution Approach 2:
The container with integrated membrane is designed as a multi-functional unit that performs freeze-drying containment, contamination barrier, and final packaging functions. This universal design eliminates the need for separate packaging operations, reducing handling steps and associated contamination risks while maintaining ease of operation.
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 effectively reduces contamination and associated costs by maintaining aseptic conditions, ensuring the integrity of heat-sensitive substances throughout the freeze-drying, packaging, and storage processes, thereby extending shelf life and convenience.
Implementation Method 1
selectively permeable membranes integrated into containers to allow solvent vapor escape while preventing liquid and contaminant entry
Implementation Method 2
membrane for transmitting air or vapor solvent out of the container
Implementation Method 3
Lyophilization is a process for drying heat-sensitive substances by freezing the substances and then subliming the ice or other frozen solvent in a high vacuum
Implementation Method 4
subliming the ice or other frozen solvent in a high vacuum
Data Source
Figure 1~2
Figure 3~5
Figure 6A~6C
AI summary
A system and method for freeze-drying a heat-sensitive substance. In some embodiments, the system and method include freeze-drying the heat-sensitive substance in an upright container with a membrane for transmitting air or vapor solvent out of the container.