Packed-Bed Bioreactor with Outlet Sensor for Uniform Cell Culture
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Solution Overview
Problem
Current packed-bed bioreactors face challenges such as non-uniform cell distribution, channeling effects leading to nutrient gradients, and inefficient cell harvesting, which hinder scalability and predictability in cell culture processes, especially for large-scale production of therapeutic proteins and viral vectors.
Innovation Solution
A bioreactor system with an ordered and regular array of porous substrate material for uniform cell seeding and media perfusion, combined with an outlet sensor for real-time monitoring and adjustment of media properties like pH, temperature, and dissolved gas levels, allowing for controlled flow rates to maintain optimal cell culture conditions and efficient cell harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If packed bed bioreactor systems are used for high-density cell culture, then volumetric cell density is improved, but non-uniform cell distribution and channeling effects occur
Solution Approach 1:
The patent applies local quality by creating zones with different flow characteristics within the bioreactor. The three-dimensional suspended bead structure creates regions with varying porosity and flow resistance, directing medium flow preferentially through under-perfused regions to achieve more uniform nutrient distribution and cell growth across the entire bed volume.
Solution Approach 2:
The patent implements dynamics by enabling the bioreactor system to adapt flow rates in real-time based on monitored conditions. The controller adjusts medium flow rates dynamically to compensate for channeling effects and non-uniform cell distribution, transforming a static packed bed system into a dynamically responsive culture environment.
2Use of energy by moving object
If medium flow rate is increased to improve nutrient delivery, then oxygen and nutrient supply is improved, but flow resistance increases and channeling worsens
Solution Approach 1:
The patent applies feedback by continuously monitoring culture conditions (pH, dissolved oxygen, metabolites) and using this information to adjust medium flow rates. The controller receives real-time data from sensors and modulates pump operation to maintain optimal nutrient supply while preventing excessive flow rates that would worsen channeling effects.
Solution Approach 2:
The patent implements parameter changes by varying medium flow rates based on culture progression and monitored parameters. The system adjusts flow rate magnitude and timing to optimize nutrient delivery at different culture stages, adapting to changing cell density, consumption rates, and flow resistance characteristics.
3Quantity of substance
If packed bed substrate is used for cell attachment, then cell density is improved, but cell harvesting becomes inefficient
Solution Approach 1:
The patent applies dynamics by enabling the system to transition between different operational states. During culture, the three-dimensional bead structure provides stable cell attachment surfaces for high-density growth. During harvesting, the system can be agitated or the beads can be released, transforming from a static attachment configuration to a dynamic harvesting mode that enables efficient cell recovery.
Solution Approach 2:
The patent implements segmentation by using discrete three-dimensional porous beads as separate culture units. Each bead acts as an independent cell attachment surface, and the beads can be individually manipulated during harvesting. This segmented structure allows cells to be released from individual beads through agitation or enzymatic treatment, facilitating efficient harvesting compared to monolithic substrates.
Data Source
AI summary
A bioreactor system for culturing cells is provided. The system includes a cell culture vessel with an interior reservoir. an inlet and an outlet fluidly connected to the reservoir. A fluid flow path supplies fluid to the inlet and receives fluid from the outlet. and a media conditioning vessel is fluidly connected to the cell culture vessel. The system also includes an outlet sensor arranged at the outlet of the cell culture vessel. The outlet sensor can detect a property of cell culture media exiting the cell culture vessel via the outlet, and the bioreactor system can adjust a property of the cell culture media based on the property detected by the outlet sensor.