Flexible Flow Stirring Device for Low Shear Cell Culture
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Solution Overview
Problem
Existing cell culture methods, such as Stirred Tank Bioreactors, cause significant shear force and uneven nutrient distribution, leading to low-quality cell growth, and lack dynamic monitoring and automation, making high-efficiency, large-scale cultivation challenging, especially during public health emergencies.
Innovation Solution
A flexible flow automatic stirring device with an S-shaped circulating path, driven by a drive system, featuring a flipping mechanism and real-time monitoring, to minimize shear force and ensure uniform nutrient distribution, with adjustable parameters for high-quality cell culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional stirring paddles are used to agitate the nutrient solution, then mixing and nutrient distribution are improved, but significant shear force is generated that causes irreversible damage or direct death to the cells
Solution Approach 1:
The invention extracts the harmful stirring function from the cell culture system by separating the paddles from the culture tank, eliminating direct contact between stirring elements and cells. The nutrient solution is circulated externally through a separate loop system, leaving cells undisturbed in their culture environment while still achieving uniform nutrient distribution.
Solution Approach 2:
The invention introduces an intermediary nutrient solution circulation system that acts as a mediator between the external environment and cells. The solution is pumped externally, filtered, and returned to the culture tank, providing nutrient distribution without direct mechanical disturbance to cells.
2Quantity of substance
If stirring paddles rotate to mix the nutrient solution, then nutrient distribution is improved, but centrifugal effect creates non-uniform flow and uneven nutrient distribution
Solution Approach 1:
The invention replaces the traditional mechanical stirring system with a controlled pumping system. Instead of rotating paddles creating turbulent centrifugal flow, a pump circulates the nutrient solution through external piping at controlled rates, creating laminar, uniform flow patterns that eliminate centrifugal effects while maintaining consistent nutrient distribution.
3Measurement precision
If manual operations are performed on individual culture dishes, then monitoring and adjustment are possible, but contamination risk increases and automation is reduced
Solution Approach 1:
The invention implements self-service monitoring through integrated sensors that automatically detect cell health parameters, nutrient concentrations, and environmental conditions. The system self-regulates by automatically adjusting pump rates and circulation patterns based on sensor feedback, eliminating the need for manual intervention and associated contamination risks.
Solution Approach 2:
The invention incorporates feedback mechanisms where sensors continuously monitor culture conditions and automatically adjust operational parameters. The system receives feedback from pH sensors, dissolved oxygen sensors, and cell density sensors, then dynamically adjusts pump circulation rates to maintain optimal conditions without manual intervention.
4Reliability
If traditional static culture methods are used for adherent cells, then cell growth is maintained, but culture cycles are long and growth is uneven
Solution Approach 1:
The invention implements continuous nutrient circulation and renewal, replacing the static batch culture method. The pump system continuously circulates fresh nutrient solution through the culture tank, ensuring constant supply of nutrients and removal of waste products, which maintains stable cell growth conditions and accelerates culture cycles compared to static methods.
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 device achieves uniform, high-efficiency, and large-scale cell culture with minimal damage, enabling real-time parameter adjustment and automation, reducing contamination risks and shortening culture cycles.
Implementation Method 1
The energy conversion is achieved through the stirring and driving motion by the drive system, while the flexible flow channel body forms an S-shaped flexible loop channel that enables the one-way flow of the nutrient solution along the S-shaped flexible loop channel with low shear force
Data Source
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AI summary
The invention provides an automatic stirring device in the field of fluid machinery and bioreactors, focusing on enhancing fluid control efficiency and consistency in biological cultivation processes. It utilizes a flexible channel body or reactor body to facilitate the flow of nutrient solution along specific channels (such as S-shaped flexible channels or S-shaped loop channels), designed to reduce shear forces and achieve iso-level uniform flow. A power system and monitoring and control system are employed to regulate the flow of nutrient solution and monitor cultivation conditions in real-time, thus supporting various bioprocess cultivation requirements.