Bioreactor Alternating Static Dynamic Cell Culture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bioreactors face challenges in minimizing shear-stress and achieving even cell distribution, particularly when transitioning between static and dynamic cultures, often resulting in uneven cell growth and increased apoptosis, as they either continuously exert reduced shear-stress or require cell transfer between different culture containers, leading to cell loss and damage.
Innovation Solution
A bioreactor system that combines magnetically controlled agitation with cell culture container inversion and alternating between vertical rotating and horizontal static cultures, allowing for seamless transition between static and dynamic states within the same container, minimizing shear-stress and ensuring even cell distribution by optimizing agitation speed, deceleration, and culture duration based on cell type and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cells are cultured in static condition, then shear-stress is minimized, but cells accumulate at the bottom and distribution becomes uneven
Solution Approach 1:
The bioreactor implements periodic alternation between static and dynamic culture states. During dynamic phases, magnetic agitation or container rotation distributes cells evenly throughout the medium. During static phases, cells settle and undergo controlled differentiation. This periodic switching prevents continuous shear-stress while ensuring even cell distribution through intermittent agitation cycles.
Solution Approach 2:
The system transitions from a purely static culture mode to a dynamic system that can switch between static and dynamic states. Magnetic agitation mechanisms or rotation capabilities are introduced to create controlled movement when needed, while allowing static periods for cell settling and differentiation, making the culture environment adaptable rather than fixed.
2Stability of the object's composition
If cells are continuously agitated to maintain even distribution, then cell distribution remains uniform, but shear-stress increases causing apoptosis
Solution Approach 1:
Instead of continuous agitation, the system uses periodic or intermittent agitation cycles. Magnetic particles are alternately agitated and held stationary, or the container is alternately rotated and held static. This provides sufficient mixing to maintain even cell distribution while allowing rest periods that minimize cumulative shear-stress exposure and reduce apoptosis.
Solution Approach 2:
The system uses magnetic particles as surrogate agitators that can be controlled remotely through magnetic fields. These magnetic copies or proxies perform the agitation function without requiring direct mechanical contact with cells, allowing precise control of shear-stress levels through field strength modulation rather than direct mechanical forcing.
3Object-affected harmful factors
If bioreactor stops running to reduce shear-stress, then shear-stress is minimized, but cells accumulate at bottom and are not evenly distributed
Solution Approach 1:
The system implements periodic cycles where the bioreactor alternates between running (dynamic) and stopped (static) states. During dynamic phases, cells are kept in suspension through magnetic agitation or rotation. During stopped phases, cells are allowed to settle for controlled differentiation. This periodic operation ensures even distribution is maintained over time while minimizing shear-stress during static periods.
Solution Approach 2:
Before allowing the bioreactor to stop and cells to settle, preliminary gentle agitation is applied to ensure cells are evenly distributed throughout the medium. This preliminary mixing action prevents localized accumulation at the bottom when the system stops, ensuring uniform initial distribution before the static phase begins.
4Adaptability or versatility
If cells are transferred between different culture containers to switch states, then static and dynamic cultures can be performed, but cell loss and damage occur
Solution Approach 1:
The bioreactor is designed as a multi-functional system that can perform both static and dynamic cell cultures within the same container. The container incorporates magnetic agitation mechanisms or rotation capabilities, allowing it to switch between culture modes without requiring physical transfer of cells to different vessels, thereby eliminating cell loss and mechanical damage associated with transfers.
Solution Approach 2:
The system merges the functions of separate static and dynamic culture vessels into a single integrated bioreactor. The same container that can hold cells for static culture also incorporates magnetic agitation or rotation mechanisms to provide dynamic culture conditions, combining multiple culture capabilities into one system and eliminating the need for cell transfer between containers.
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
This approach creates an ideal metabolic environment for cell growth, reducing apoptosis and non-specific differentiation, enabling efficient cell expansion and even distribution in both static and dynamic states, thereby improving cell yield and quality.
Implementation Method 1
The bioreactor system uses a magnetic field to generate a magnetic force that moves cells and culture medium between static and dynamic states
Data Source
Figure 1
Figure 2a~2f
Figure 3a~3b
AI summary
The invention relates to a bioreactor system characterized by its capacity in cultivating cells in all three states: static, dynamic, or alternating between static and dynamic states in the same cell culture container or containers, with the even distribution of cells in cell static culture following a dynamic culture. In the invented bioreactor system, the combined application of the magnetically controlled agitation and the cell culture container inversion as well as the combined application of the vertical rotating culture and horizontal static culture are the two strategies in building ideal bioreactors for the cell culture alternating between static and dynamic states in the same cell culture container, which can minimize the sheer-stress and provide cells an ideal metabolic environment.