Structured Cell Growth Matrix for Uniform Bioreactor Cell Culture
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Solution Overview
Problem
Existing bioreactors with non-structured cell growth matrices face issues of reproducibility, non-homogeneous cell culture environments, difficulty in determining cell culture surface, laborious packing, and high costs due to variable carrier sizes and shapes, leading to uneven nutrient and oxygen distribution and reduced cell production rates.
Innovation Solution
A structured cell growth matrix assembly with immobilization and spacer layers that create a tortuous path for cell and medium flow, ensuring homogeneous distribution and efficient nutrient delivery, while minimizing pressure drops and facilitating scalable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-structured cell growth matrixes with variable carrier sizes and shapes are used, then device complexity is reduced, but manufacturing precision and reproducibility deteriorate due to difficulty in packing and variable micro-environments
Solution Approach 1:
The cell growth matrix is divided into multiple discrete layers (first layer, second layer, third layer) with specific structural characteristics. Each layer contains carriers arranged in a structured manner, creating distinct functional zones that improve packing reproducibility while maintaining manufacturing simplicity.
Solution Approach 2:
Different regions of the matrix are designed with different properties: the first layer has a specific structure for initial cell attachment, the second layer provides a different micro-environment for cell growth, and the third layer offers yet another configuration. This local differentiation ensures homogeneous nutrient and oxygen distribution throughout the matrix while maintaining overall structural simplicity.
2Ease of operation
If carriers are allowed to move and redistribute under culture medium flow, then ease of operation is improved, but reliability deteriorates due to unreproducible cell culture environment and heterogeneous micro-environments
Solution Approach 1:
The matrix structure is designed to be dynamically stable rather than completely fixed. Carriers are positioned in a way that allows limited movement and redistribution under medium flow, which prevents carrier aggregation and maintains homogeneous nutrient distribution, while the overall layered structure ensures reproducible culture conditions.
3Device complexity
If carriers gather in given areas inside the bioreactor, then device complexity is reduced, but productivity deteriorates due to limited cell access to medium and oxygen
Solution Approach 1:
The matrix creates localized regions with different carrier densities and configurations across three layers. This prevents carrier aggregation in specific areas by distributing carriers uniformly throughout the matrix volume, ensuring all cells have equitable access to culture medium and oxygen, thereby maximizing cell production rate.
4Ease of manufacture
If non-structured matrixes are used, then ease of manufacture is improved, but measurement precision deteriorates due to inability to determine cell culture surface with precision
Solution Approach 1:
The matrix is constructed as three distinct layers with defined structures. This segmentation allows the cell culture surface area to be calculated by summing the known surface areas of each layer, providing precise measurement while maintaining ease of manufacture through standardized layer construction.
Data Source
AI summary
The invention provides a structured cell growth matrix or assembly comprising a one or more spacer layers and one or more cell immobilization layers. The invention further provides a bioreactor comprising said matrix or assembly.