Bioreactor Optical Windows for Real-Time Cell Density Monitoring
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Solution Overview
Problem
Current cell culture containers have limited ability to adjust culture conditions and insufficient capabilities for on-line and in-line monitoring of critical process parameters, leading to inconsistent growth conditions and reduced cell density due to contamination and imprecise understanding of bioprocess variables.
Innovation Solution
A bioreactor system incorporating Process Analytical Technology (PAT) sensors for real-time monitoring and control of parameters such as cell density, pH, oxygen, and metabolites, with automatic adjustment of growth medium injection and expulsion, ensuring consistent and optimized growth conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional cell culture containers are used, then device simplicity is maintained, but monitoring precision and control capability of critical process parameters are insufficient
Solution Approach 1:
The bioreactor integrates multiple functions including culture medium storage, cell cultivation, real-time parameter monitoring (pH, DO, temperature, cell density), and automated medium exchange within a single system. The culture medium vessel serves both as storage reservoir and as the cultivation environment, while optical windows enable simultaneous multiple parameter measurements.
Solution Approach 2:
The system continuously monitors critical process parameters such as pH, dissolved oxygen, temperature, and cell density using integrated sensors, and automatically adjusts culture medium injection and expulsion rates based on real-time measurements. This closed-loop feedback control ensures optimal growth conditions are maintained throughout the culture process.
2Stability of the object's composition
If real-time monitoring and automatic control systems are implemented, then growth condition consistency is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors critical process parameters such as pH, dissolved oxygen, temperature, and cell density using integrated sensors, and automatically adjusts culture medium injection and expulsion rates based on real-time measurements. This closed-loop feedback control ensures optimal growth conditions are maintained throughout the culture process.
Solution Approach 2:
The bioreactor system performs self-regulation of growth conditions through automated medium exchange based on real-time parameter monitoring. The system independently maintains optimal pH, oxygen, and nutrient levels without manual intervention, reducing operational complexity while ensuring consistent growth conditions.
3Productivity
If culture medium volume is increased to support larger cell density, then cell proliferation capacity is improved, but contamination risk increases
Solution Approach 1:
The system continuously monitors cell density and automatically performs partial medium exchanges to maintain optimal culture conditions throughout the growth period. This continuous action prevents nutrient depletion and waste accumulation that could lead to cell stress and contamination, enabling sustained high cell proliferation.
Solution Approach 2:
The system continuously monitors critical process parameters such as pH, dissolved oxygen, temperature, and cell density using integrated sensors, and automatically adjusts culture medium injection and expulsion rates based on real-time measurements. This closed-loop feedback control ensures optimal growth conditions are maintained throughout the culture process.
4Loss of information
If optical monitoring systems are integrated, then process analytical capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The bioreactor integrates multiple functions including culture medium storage, cell cultivation, real-time parameter monitoring (pH, DO, temperature, cell density), and automated medium exchange within a single system. The culture medium vessel serves both as storage reservoir and as the cultivation environment, while optical windows enable simultaneous multiple parameter measurements.
Solution Approach 2:
Optical windows are integrated into the bioreactor walls to enable non-invasive optical measurements of cell density and other parameters. These windows act as intermediaries that allow light to pass through the culture medium for spectroscopic analysis without compromising the sealed culture environment or requiring direct sensor contact with cells.
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
Enhances cell proliferation and quality by providing real-time monitoring and control, reducing contamination risks and improving the accuracy of bioprocess understanding, leading to uniform and consistent growth conditions.
Implementation Method 1
A semipermeable membrane is disposed at a bottom of the cell retention vessel
Implementation Method 2
one or more sensor adapters to fix optical detectors
Data Source
AI summary
A bioreactor includes a culture medium vessel housing culture medium. The culture medium vessel further includes a first side surface including a first transparent optical window; and a second side surface parallel to the first surface and including one or more sensor adapters to fix optical sensors. A cell retention vessel is disposed underneath and connected to the culture medium vessel, the cell retention vessel housing biological cells and having: a top surface that intersects a base of the culture medium vessel, and a second transparent optical window indented into the top surface at a first corner of the top surface. A semipermeable membrane is disposed at a bottom of the cell retention vessel, and a frame comprising a grid is disposed underneath the semipermeable membrane.