Coupled Bioreactor Vessels for Uniform Culture Parameter Control
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Solution Overview
Problem
The challenge of scaling up bioreactors while maintaining consistent bioprocess parameters such as titer and cell viability is complex, especially in single-use bioreactors, due to the non-linear scaling of physical laws, leading to inconsistencies in cell densities and product quality across different volumes.
Innovation Solution
A bioreactor system with fluidically coupled vessels and a control system that adjusts flow rates between vessels to maintain uniform parameters like pH, temperature, and dissolved oxygen, allowing bidirectional flow and closed-loop configurations to ensure consistent conditions across multiple vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bioreactor volume is increased to scale up production, then productivity increases, but parameter uniformity deteriorates due to non-linear scaling of physical laws
Solution Approach 1:
The system divides a large bioreactor volume into multiple smaller coupled vessels (e.g., 500 mL vessels instead of a single 2 L vessel). Each vessel maintains its own microenvironment, ensuring parameter uniformity while the collective system achieves the desired production volume. The vessels are connected via fluidic paths allowing culture medium exchange to maintain consistency across all vessels.
2Manufacturing precision
If multiple independent bioreactors are used to maintain parameter uniformity, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
Multiple vessels are merged into a single integrated system through fluidic connections and a unified control system. The control system manages all vessels simultaneously, adjusting flow rates between vessels to maintain parameter uniformity. This combining approach achieves parameter consistency without requiring completely independent bioreactor systems.
Solution Approach 2:
The control system continuously monitors parameters (pH, temperature, dissolved oxygen) in each vessel and adjusts flow rates between vessels in real-time based on feedback from sensors. This closed-loop control ensures parameter uniformity across all vessels while automatically compensating for any deviations, reducing the need for manual intervention.
3Ease of operation
If single-use bioreactors are used to simplify operation, then ease of operation improves, but scaling capability deteriorates due to volume limitations
Solution Approach 1:
The system uses identical single-use vessels that can serve multiple functions: each vessel can operate independently or be coupled with other vessels to achieve different total volumes. The same 500 mL vessel design is used whether operating alone or as part of a multi-vessel system, providing operational simplicity while enabling scalable production from 500 mL to 2 L and beyond.
Data Source
AI summary
A method of carrying out a bioreaction in a multivessel bioreactor system may include flowing a culture medium at an initial flow rate through one or more fluidic paths between a master vessel and one or more slave vessels, detecting a first culture medium parameter value in the master vessel or the slave vessels, transmitting the first culture medium parameter value to a control system, determining an adjusted flow rate of the culture medium at the control system based on the first culture medium parameter value, and controlling a bidirectional fluid transfer device with the control system to adjust the flow rate of the culture medium through the one or more fluidic paths. The control system may adjust the flow rate of the culture medium to maintain a substantially uniform value of the first culture medium parameter value in the master vessel or the one or more slave vessels.