Fixed-Bed Cell Culture Vessel With Piston-Driven Cell Harvest
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Solution Overview
Problem
Existing bioreactor systems face challenges in achieving uniform cell distribution, efficient nutrient delivery, and viable cell harvest for large-scale production of anchorage-dependent cells, particularly in packed-bed bioreactors, which suffer from non-uniform cell trapping, channeling effects, and inefficient cell recovery.
Innovation Solution
A cell culture system with a piston-driven bioreactor design that uses pressurization to manage fluid flow, aeration, and cell harvest, employing a porous substrate with uniform cell distribution and automated piston actuation for dissociation and harvest, eliminating the need for cell lysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If packed bed bioreactor systems are used for high-density cell culture, then volumetric cell density is improved, but cell distribution uniformity deteriorates due to non-uniform cell trapping and channeling effects
Solution Approach 1:
The packed bed is segmented into multiple zones with different porosity values along the flow direction. The porosity gradient causes medium to distribute more uniformly across the bed cross-section, preventing channeling effects while maintaining high cell density. This segmentation approach allows cells to be distributed uniformly throughout the entire bed volume rather than concentrating at the inlet region.
Solution Approach 2:
Different regions of the packed bed are assigned different local properties - specifically, porosity varies along the flow direction to create optimal conditions for cell distribution. The porosity gradient ensures that medium flow resistance is balanced across different zones, preventing preferential flow paths and achieving uniform cell trapping throughout the bed.
2Quantity of substance
If packed bed systems are used for cell culture, then high cell density is achieved, but cell harvest efficiency deteriorates due to inability to efficiently recover intact viable cells
Solution Approach 1:
The system transitions from a static packed bed to a dynamic system where the bed can be expanded and contracted. During harvest, the bed is expanded to loosen the matrix structure, allowing cells to be detached and harvested efficiently. This dynamic adjustment enables high cell recovery without requiring harsh agitation or cell lysis methods that would damage viability.
Solution Approach 2:
The physical state of the packed bed is changed by expanding it during the harvest phase. This parameter change (from compressed to expanded state) loosens the matrix structure, reducing cell entrapment and enabling efficient cell recovery while maintaining cell integrity and viability.
3Quantity of substance
If packed bed matrices are used for cell entrapment, then high volumetric density is achieved, but nutrient delivery efficiency deteriorates due to channeling effects
Solution Approach 1:
The packed bed is divided into zones with varying porosity to optimize nutrient flow distribution. This segmentation prevents channeling by creating a porosity gradient that balances flow resistance across different regions, ensuring uniform nutrient delivery to all cell populations throughout the bed.
Solution Approach 2:
Different porosity values are assigned to different zones along the flow direction to create optimal nutrient delivery conditions. The local porosity variation ensures that medium flows uniformly through all regions of the bed, preventing preferential flow paths and ensuring efficient nutrient distribution to high cell density regions.
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-yield, viable cell harvest with uniform cell distribution and efficient nutrient delivery, supporting scalable production of therapeutic products like viral vectors and antibodies.
Implementation Method 1
the driver being configured to pressurize the interior cavity via actuation of the piston to harvest cells from the cell culture space through the at least one port
Implementation Method 2
employing a porous substrate with uniform cell distribution
Data Source
AI summary
A cell culture system is provided that includes a cell culture vessel having an interior cavity to house a cell culture substrate in a cell culture space, and at least one port for at least one of fluid inlet to the interior cavity and fluid outlet from the interior cavity. The system further includes a piston having a distal end disposed in the cell culture vessel above the cell culture space, the distal end of the piston being sealed with an airtight seal within the interior cavity. The system also includes a driver coupled to the piston to move the piston so as to increase and decrease a distance between the distal end and the cell culture space. The driver can pressurize the interior cavity via actuation of the piston to harvest cells from the cell culture space through the at least one port.