Bioreactor Filter Pocket With Low Swelling Medium
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bioreactors face challenges with mechanical stability of perfusion filters during long-term use and impaired gas exchange due to filter warping and folding, which leads to mechanical stress and reduced efficiency in cell culture processes.
Innovation Solution
A bioreactor design featuring a filter pocket fixed to the inner surface with a hydrophilic or hydrophobic filter medium that minimizes swelling and folding, ensuring mechanical stability and unimpeded gas exchange, utilizing a hydrophilic filter medium with a degree of swelling and shrinkage of no more than 1% and reinforced with porous fabrics for enhanced durability and filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a filter medium with large pore size is used for high permeability, then perfusion efficiency is improved, but mechanical strength and resistance to folding are reduced
Solution Approach 1:
The filter module uses a composite structure combining a porous substrate (for filtration) with a reinforcing mesh or skeleton (for mechanical strength). This allows the filter medium to maintain both high permeability for efficient perfusion and sufficient mechanical strength to resist folding and damage during continuous operation.
Solution Approach 2:
The filter medium is designed as a flexible but mechanically robust membrane that can conform to the bioreactor wall while maintaining its structural integrity. The flexible design allows it to withstand pressure differences and mechanical stress without folding or breaking, while the porous structure maintains high permeability for cell-free medium removal.
2Productivity
If the filter medium is made highly permeable with large void volume, then cell-free medium removal is improved, but the filter medium develops distortions and folds leading to breakage
Solution Approach 1:
The combination of porous filtration material with a reinforcing structural network provides both the high permeability needed for efficient cell-free medium removal and the mechanical stability required to prevent folding and breakage during prolonged operation.
Solution Approach 2:
The filter medium's physical parameters are optimized by controlling pore size distribution, thickness, and mechanical properties to achieve a balance between permeability for high productivity and structural integrity for long-term reliability in continuous perfusion operation.
3Ease of operation
If a floating filter module is used for perfusion, then installation is simplified, but gas exchange with the culture medium is impaired
Solution Approach 1:
Instead of using a floating filter module that creates a physical barrier between gas and culture medium, the invention integrates the filter directly into the bioreactor wall structure. This eliminates the floating component while maintaining perfusion functionality, allowing uninterrupted gas exchange at the gas-liquid interface.
Solution Approach 2:
The filter medium is merged with the bioreactor wall structure rather than being a separate floating component. This integration eliminates the floating module that would impede gas exchange, while the filter continues to perform its separation function at the wall interface.
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 solution provides a mechanically stable and efficient perfusion system that prevents filter medium damage and maintains effective gas exchange, ensuring prolonged operation without filter warping or blockages, thereby supporting high-density cell culture processes.
Implementation Method 1
at least one filter pocket wall is at least partially formed by a hydrophilic filter medium... even with a filter pocket covering an entire wall of the bioreactor, wrinkling of the filter medium is avoided if the filter medium has a swelling and/or shrinkage coefficient of no more than 1% in water
Implementation Method 2
The cell-free culture medium is separated by a filtration module in the form of a filter bag, consisting of a large-pore filter medium whose periphery is welded to one of the inner bioreactor walls
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a bioreactor for cultivating cells having a filter bag for separating culture fluid and cells, the filter medium of the filter bag having a degree of swelling of less than 1%. The bioreactor according to the invention is characterized by a high durability of the filter bag thereof.