Multilayered Cell Culture Substrate for Fixed Bed Bioreactor
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Solution Overview
Problem
Current cell culture bioreactors face challenges in achieving uniform cell distribution, efficient nutrient delivery, and viable cell harvesting due to non-uniform substrate packing and random fiber arrangements, leading to suboptimal growth and production inefficiencies.
Innovation Solution
A multilayered fixed bed cell culture matrix with structurally defined, regular, and uniform substrate layers allows for uniform cell seeding, efficient media perfusion, and easy cell harvesting, featuring a woven substrate with interwoven fibers and strategically arranged openings for fluid flow, enabling high-density cell culture and scalable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If packed bed bioreactor systems with random fiber arrangements are used, then cell culture surface area is increased, but cell distribution uniformity deteriorates
Solution Approach 1:
The substrate is divided into multiple layers with distinct functions: a support layer providing structural integrity and a sampling layer enabling cell removal. This segmentation allows the support layer to maintain uniform cell distribution while the sampling layer facilitates harvesting, resolving the contradiction between increased surface area and uniform cell distribution.
Solution Approach 2:
Different regions of the substrate have different properties: the support layer has high mechanical strength for structural support, while the sampling layer has controlled porosity and cell attachment characteristics for easy cell removal. This local differentiation enables the system to maintain uniform cell distribution across the large surface area while allowing efficient harvesting from specific regions.
2Quantity of substance
If packed bed bioreactor systems with random fiber arrangements are used, then cell density is increased, but nutrient delivery uniformity deteriorates
Solution Approach 1:
The substrate is segmented into a support layer that maintains structural integrity and a sampling layer that facilitates nutrient distribution. This segmentation ensures that nutrients are delivered uniformly across the high cell density while allowing efficient harvesting, resolving the contradiction between increased cell density and uniform nutrient delivery.
Solution Approach 2:
The support layer provides structural support for high cell density, while the sampling layer has optimized porosity and hydrophobicity for uniform nutrient distribution. This local quality differentiation enables the system to maintain high cell density while ensuring uniform nutrient delivery to all cells.
3Volume of stationary object
If packed bed bioreactor systems are used, then cell culture volume is increased, but cell harvesting efficiency deteriorates
Solution Approach 1:
The substrate is segmented into a support layer and a sampling layer. The sampling layer can be selectively removed to harvest cells from the large volume culture, enabling efficient harvesting from high-volume cell cultures without disrupting the entire bioreactor system.
Solution Approach 2:
The sampling layer is extracted or removed from the support layer to enable cell harvesting. This extraction allows efficient recovery of cells from large-volume cultures by removing only the necessary sampling layer, leaving the support layer intact for potential reuse or minimal disruption to the bioreactor.
4Ease of manufacture
If random fiber packaging is used, then substrate manufacturing simplicity is maintained, but flow resistance uniformity deteriorates
Solution Approach 1:
The substrate is segmented into a support layer with uniform flow characteristics and a sampling layer with controlled porosity. This segmentation allows the support layer to maintain uniform flow resistance while the sampling layer facilitates cell harvesting, resolving the contradiction between manufacturing simplicity and flow resistance uniformity.
Solution Approach 2:
The support layer has optimized porosity and hydrophobicity for uniform flow resistance and nutrient distribution, while the sampling layer has different porosity characteristics for easy cell removal. This local quality differentiation enables the system to maintain uniform flow resistance across the large surface area while allowing efficient harvesting.
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
This solution achieves uniform cell distribution, improved nutrient delivery, and high-yield cell harvesting, enhancing bioprocess productivity and scalability while maintaining cell viability, capable of producing high quantities of viral genomes and supporting large-scale industrial bioprocessing.
Implementation Method 1
A multilayered fixed bed cell culture matrix with structurally defined, regular, and uniform substrate layers allows for uniform cell seeding
Implementation Method 2
a plurality of openings formed in the substrate and passing through the thickness of the substrate, the plurality of openings being configured to allow flow of at least one of cell culture media, cells, or cell products through the thickness of the substrate
Implementation Method 3
at least a portion of the cell culture substrate comprises a sample substrate, the sample substrate being defined by a separation boundary between the sample substrate and a remainder of the cell culture substrate, and wherein the separation boundary is configured to separate the sample substrate from the remainder of the cell culture substrate
Data Source
AI summary
A cell culture substrate (200, 308) for a fixed bed bioreactor and a fixed bed bioreactor having such a cell culture substrate is provided. The substrate has a structurally defined surface for culturing cells thereon, where the structurally defined surface defines an ordered and regular array of openings through a thickness of the cell culture substrate. At least a portion of the cell culture substrate includes a sample substrate, the sample substrate being defined by a separation boundary between the sample substrate and a remainder of the cell culture substrate, and the separation boundary allows separation of the sample substrate from the remainder of the cell culture substrate. A bioreactor (300) having ports for aseptic removal of the sample substrate is also provided.