Modular Stacked Bioreactor for Uniform Cell Culture
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Solution Overview
Problem
Existing packed-bed bioreactors face challenges such as non-uniform cell distribution, nutrient and oxygen gradients, and inefficient cell harvesting, limiting their scalability and productivity for large-scale production of anchorage-dependent cells.
Innovation Solution
A modular stacked packed-bed bioreactor system with individually scalable subunits, each having a short media perfusion path and alignment features for stacking, ensuring uniform media flow and optimal cell culture conditions, and a cell culture substrate that allows for efficient cell attachment and harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If packed bed bioreactors are designed with long media perfusion path to increase cell density, then volumetric cell density is improved, but nutrient and oxygen gradients develop causing non-uniform cell distribution and reduced cell viability
Solution Approach 1:
The bioreactor is divided into multiple stacked modules, each with its own independent media perfusion path. This segmentation allows each module to maintain short perfusion paths while achieving high overall cell density through vertical stacking, eliminating nutrient and oxygen gradients that would otherwise develop in long perfusion paths.
Solution Approach 2:
The design transitions from a single horizontal perfusion path to multiple vertical stacked modules with short internal paths. By adding the vertical dimension through stacking, the system achieves high volumetric cell density without extending the horizontal perfusion distance, thereby maintaining uniform nutrient and oxygen distribution.
2Reliability
If packed bed bioreactors are made small to reduce nutrient gradients, then cell viability is improved, but scalability for large-scale manufacturing is limited
Solution Approach 1:
The system uses multiple identical small-scale modules stacked together, each maintaining optimal size for cell viability. These modular units can be stacked vertically to achieve large-scale manufacturing capacity without compromising the cell viability conditions in each individual module.
Solution Approach 2:
Multiple small bioreactor modules are nested vertically in a stacked configuration, allowing the system to achieve large overall volume and manufacturing scale while each individual module maintains the small size necessary for optimal nutrient distribution and cell viability.
3Productivity
If traditional packed bed systems are used, then cell culture is achieved, but cell harvesting is inefficient and causes significant cell damage
Solution Approach 1:
Each modular unit can be independently harvested, allowing for controlled cell recovery without the need to disrupt the entire packed bed. This modular approach enables efficient cell harvesting while maintaining cell viability, as cells can be collected from individual modules without causing the mechanical disturbance and cell damage associated with traditional whole-bed harvesting methods.
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 modular system enables scalable and efficient production of high-density cell cultures with uniform nutrient and oxygen distribution, enhancing cell viability and productivity, and facilitating easy cell harvesting, thus overcoming the limitations of traditional packed-bed bioreactors.
Implementation Method 1
anchorage dependent cells which attach and proliferate on a surface of the cell culture substrate
Implementation Method 2
The cell culture substrate can be porous to allow flow of medium, nutrients, oxygen and cell products therethrough
Data Source
AI summary
A modular and stacked cell culture system that includes a standalone cell culture subunit with an interior cavity to house a cell culture substrate in a cell culture space, a fluid inlet to supply fluid to the cell culture space, and a fluid outlet to remove fluid from the cavity. The cavity is arranged for fluid to flow in from the fluid inlet, then through the cell culture space, and then out through the fluid outlet. The subunit further includes an alignment feature on at least one of a top and a bottom of the standalone cell culture subunit, wherein the alignment feature aligns with an alignment feature of another standalone cell culture subunit, such that multiple standalone cell culture subunits are stackable.