Tubular Packed-Bed Cell Culture Substrate for Uniform Distribution
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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 cell culture system with a bioreactor vessel containing a structured cell culture substrate made of woven fibers, providing a uniform and open porous structure for consistent cell seeding, growth, and harvesting, and featuring a tubular support with perforations for even media flow, allowing for scalable and predictable cell culture operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional packed-bed bioreactors use random fiber packaging, then cell substrate is provided for adherent cell attachment, but non-uniform cell distribution and channeling effect occur
Solution Approach 1:
The patent applies local quality by creating regions with different fiber orientations and densities within the packed bed. Specifically, the substrate is constructed with alternating layers of randomly oriented fibers and aligned fibers, creating local variations in flow resistance and cell trapping efficiency that collectively improve overall uniformity. This local structuring prevents the channeling effect while maintaining high cell density throughout the bed.
Solution Approach 2:
The patent uses composite materials by combining different fiber types, orientations, and densities within the substrate structure. The substrate comprises a mixture of randomly oriented fibers and aligned fibers, creating a composite structure that balances cell attachment capabilities with uniform flow distribution. This composite approach allows the material to exhibit both high cell retention and uniform nutrient delivery.
2Productivity
If packed bed bioreactors recirculate medium through substrate, then nutrients and oxygen are provided for cell growth, but flow resistance varies creating channeling effect
Solution Approach 1:
The patent addresses flow uniformity by implementing local quality variations in the substrate structure. Alternating layers of random and aligned fibers create local regions with different flow resistance characteristics, preventing preferential flow paths. This local structuring ensures that medium flows uniformly through the entire packed bed, delivering consistent nutrients and oxygen to all cell regions.
Solution Approach 2:
The patent applies dynamics by making the substrate structure adaptable to flow conditions. The combination of random and aligned fibers creates a dynamic flow distribution pattern that self-regulates under recirculation conditions, preventing channeling effects while maintaining high productivity throughout the culture process.
3Productivity
If substrate is loosened and agitation is applied to harvest cells, then cell recovery efficiency is improved, but significant cell damage occurs reducing viability
Solution Approach 1:
The patent applies segmentation by designing the substrate as a modular structure with distinct regions that can be independently manipulated during harvest. The alternating layers of random and aligned fibers allow for selective loosening and agitation in specific zones, enabling efficient cell recovery while minimizing damage to cells in other regions. This segmented approach maintains high viability during harvest.
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 system enables high-yield cell culture with uniform cell distribution, efficient nutrient delivery, and high viability during harvesting, supporting scalable production from process development to industrial scales while maintaining consistent performance.
Implementation Method 1
a cell culture substrate having a structurally defined surface area and an open porous structure that prevents cell entrapment and enables uniform flow
Implementation Method 2
featuring a tubular support with perforations for even media flow
Data Source
AI summary
A cell culture system is provided that includes a bioreactor vessel having an interior void defining a cell culture space, an inlet fluidly connected to a first end of the cell culture space, and an outlet fluidly connected to a second end of the cell culture space; and at least one cell growth element disposed in the cell culture space. The cell growth element includes a cell culture substrate surrounding a support element extending in a direction from the first end to the second end of the cell culture space.