Hybrid Fixed Bed Cell Culture Substrate with Layered Fiber Spacing
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Solution Overview
Problem
Existing cell culture bioreactors face challenges such as non-uniform cell distribution, channeling effects leading to nutrient gradients, and inefficient cell harvesting, which hinder large-scale production of cell and virus products.
Innovation Solution
A cell culture matrix for fixed bed reactors is developed, comprising stacked substrate layers with an ordered array of openings, using two different substrate materials with varying fiber spacings, allowing for uniform fluid flow and efficient cell harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells are cultured in high-density formats to increase volumetric density, then cell production efficiency is improved, but cell distribution uniformity deteriorates
Solution Approach 1:
The substrate is divided into multiple layers with different fiber spacing characteristics. The first substrate layer has smaller fiber spacing to trap cells effectively, while the second substrate layer has larger fiber spacing to allow uniform media flow. This segmentation resolves the contradiction by distributing different functions across layers, achieving both high cell density and uniform distribution.
2Quantity of substance
If packed bed systems are used to provide high surface area for cell attachment, then cell culture capacity is improved, but fluid flow uniformity deteriorates due to channeling effects
Solution Approach 1:
Different regions of the packed bed (different layers) are given different fiber spacing properties. The first layer with smaller fiber spacing provides high cell attachment capacity, while the second layer with larger fiber spacing provides uniform fluid flow characteristics. This local differentiation resolves the contradiction between high surface area and uniform flow.
3Ease of manufacture
If random fiber packaging is used to create packed bed substrate, then substrate manufacturing is simplified, but flow resistance uniformity deteriorates
Solution Approach 1:
The substrate is segmented into two distinct layers with different fiber spacing. This segmentation allows each layer to be optimized for its specific function while maintaining the simplicity of random fiber packaging manufacturing process. The manufacturing simplicity is preserved while achieving flow resistance uniformity through the layered structure.
4Quantity of substance
If cells are trapped at inlet regions to function as depth filter, then cell concentration is improved, but nutrient distribution deteriorates
Solution Approach 1:
The filtering and concentration function is separated from the nutrient distribution function by dividing the substrate into two layers. The first layer with smaller fiber spacing performs cell trapping and concentration, while the second layer with larger fiber spacing ensures uniform nutrient distribution. This functional segmentation resolves the contradiction between cell concentration and nutrient distribution uniformity.
Data Source
AI summary
A cell culture matrix for culturing cells in a fixed bed reactor is provided. The cell culture matrix includes a plurality of substrate layers in a stacked arrangement, with each layer being a substrate material with an ordered and regular array of openings passing through the layer, where the openings are separated by the substrate material, which has a physical structure that is substantially regular and uniform and that is for growing cell thereon. The plurality of substrate layers includes a first substrate material and a second substrate material that is different from the first substrate material in at least one physical dimension. The first substrate material and the second substrate material make up separate layers of the plurality of substrate layers.