Layered Cell Growth Matrix for Uniform Bioreactor Flow
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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 pressure drops, leading to variable cell metabolism and 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 medium circulation, while minimizing pressure drops and facilitating scalable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If non-structured cell growth matrices with carriers are used, then cell growth surface area can be increased, but homogeneity of cell culture environment deteriorates and reproducibility is compromised
Solution Approach 1:
The matrix is segmented into multiple layers with distinct functions: a support layer providing structural integrity, an immobilization layer with cells, and a spacer layer creating flow channels. This segmentation allows each layer to optimize its specific function while maintaining overall homogeneity.
Solution Approach 2:
The invention transitions from traditional three-dimensional random carrier arrangements to a two-dimensional layered structure with defined thicknesses. The spacer layer thickness (0.1-5 mm) and immobilization layer thickness (0.1-10 mm) create controlled vertical dimensions that ensure uniform medium distribution throughout the matrix.
2Quantity of substance
If non-structured matrices with variable carrier sizes and shapes are used, then cell growth capacity can be increased, but manufacturing precision and packing difficulty worsen
Solution Approach 1:
Different regions of the matrix have different qualities: the support layer provides structural support, the immobilization layer contains cells with specific local density, and the spacer layer provides flow distribution. Each layer has controlled thickness and composition optimized for its local function.
Solution Approach 2:
The invention controls key parameters: spacer layer thickness (0.1-5 mm), immobilization layer thickness (0.1-10 mm), and porosity ratios (0.1-10%). These parameter ranges ensure manufacturability while maintaining high cell growth capacity and uniform packing.
3Productivity
If carriers are packed in bioreactors to increase cell density, then productivity is improved, but pressure drops increase and cell viability deteriorates
Solution Approach 1:
The spacer layer acts as an intermediary between the support layer and the immobilization layer, creating dedicated flow channels that mediate medium distribution. This intermediary structure ensures sufficient flow paths even at high cell densities, preventing excessive pressure drops.
Solution Approach 2:
The matrix utilizes porous structures in both the support layer and spacer layer to maintain open flow paths. The controlled porosity (0.1-10%) ensures medium can penetrate through the matrix while supporting high cell density, balancing productivity with acceptable pressure drops.
4Device complexity
If non-structured matrices are used, then device complexity is reduced, but measurement precision of cell culture surface cannot be determined
Solution Approach 1:
The invention replaces complex three-dimensional carrier arrangements with a simplified layered mechanical structure. The cell culture surface can be precisely determined by measuring the area of the support layer and multiplying by the porosity ratio, providing a straightforward calculation method.
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.