Flexible Chamber Wave Motion Bioreactor Oxygen Transfer
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Solution Overview
Problem
Single-use bioreactor systems face challenges in maximizing oxygen transfer while maintaining cell viability, as bubbling and agitation can be detrimental to mammalian cell cultures, and existing methods lack effective monitoring for optimizing cell culture conditions.
Innovation Solution
A system comprising a flexible chamber, motion generator, and sensors that induce a wave motion within the fluid to enhance oxygen transfer and monitor viscosity changes, allowing for real-time adjustments to optimize cell growth and minimize shear forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bubbling and agitation are used to maximize oxygen transfer, then oxygen transfer is improved, but cell viability deteriorates due to shear forces and bubble breakup
Solution Approach 1:
The invention extracts the harmful bubbling mechanism from the oxygen transfer process and replaces it with a surface-based aeration system. Gas is introduced at the liquid surface through a porous plate or membrane, eliminating subsurface bubbling that causes shear stress and bubble-induced cell damage while maintaining oxygen transfer efficiency.
Solution Approach 2:
A porous plate or membrane acts as an intermediary between the gas phase and liquid phase, enabling gentle gas introduction at the liquid surface. This intermediary structure distributes gas flow evenly and prevents direct bubble contact with cells, reducing shear forces while facilitating oxygen transfer.
2Productivity
If agitation is increased to enhance mixing and oxygen transfer, then oxygen transfer is improved, but shear forces increase causing cell damage
Solution Approach 1:
The invention removes the mechanical agitation component from the oxygen transfer system and replaces it with surface aeration. Gas introduction at the liquid surface creates gentle mixing through natural convection and surface wave formation, eliminating the need for high-shear mechanical agitation.
Solution Approach 2:
The system uses pneumatic introduction of gas at the liquid surface to achieve mixing and oxygen transfer without mechanical agitation. The gas flow itself drives fluid motion through surface deformation and convection currents, providing gentle mixing that preserves cell viability.
3Productivity
If wave motion is used to enhance oxygen transfer, then oxygen transfer is improved, but viscosity changes require real-time monitoring
Solution Approach 1:
The invention implements a feedback-based monitoring system that measures wave characteristics (amplitude, frequency, viscosity) and uses this information to adjust gas flow rates and wave generation parameters in real-time. This feedback loop maintains optimal oxygen transfer while adapting to changing fluid properties during cell culture processes.
Solution Approach 2:
The wave motion system is self-regulating through the relationship between gas flow rate and wave characteristics. The system automatically adjusts wave amplitude and frequency based on inherent fluid dynamics, reducing the need for complex external control mechanisms while maintaining optimal oxygen transfer conditions.
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 effectively enhances oxygen transfer and maintains cell viability by using wave motion to reduce shear forces and continuously monitor viscosity, providing optimal conditions for cell growth and expression.
Implementation Method 1
The motion generator is configured to induce a wave motion within the fluid
Implementation Method 2
The at least one sensor is affixed at least in part to a portion of the flexible chamber and is configured to measure at least a strain on a portion of the flexible chamber
Implementation Method 3
Oxygen diffusion in culture media is a function of a liquid-to-air surface area when operating the bioreactor
Data Source
AI summary
A system and method for monitoring viscosity changes of a fluid stored in a volume are provided. The system includes a flexible chamber configured to receive and hold the fluid, a motion generator configured to induce a wave motion within the fluid, at least one sensor affixed at least in part to a portion of the flexible chamber and configured to measure at least a strain on a portion of the flexible chamber and generate an associated strain output. The strain output is effectuated by the wave motion of the fluid within the flexible chamber and correlates to a viscosity value of the fluid. A computer or controller is configured to receive the strain output from the sensor at a given time, compare the viscosity value associated with the strain output to a reference viscosity value, and determine whether to adjust the wave motion generated by the motion generator.