Bioreactor Lid Design for Microgravity Cell Culture Access
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Solution Overview
Problem
Current microgravity bioreactors face issues such as rapid dehydration, air bubble introduction, fluid turbulence, and difficult access to the incubation cavity, which hinder long-term cell growth and differentiation, especially in small volume bioreactors.
Innovation Solution
A bioreactor design featuring a removable lid that forms the end wall of the incubation cavity, equipped with a semipermeable membrane for gas exchange and a sealable lid with a transparent section for monitoring, allowing easy access and minimizing dead volume and turbulence, while maintaining high humidity and preventing air bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealable port closure is used in microgravity bioreactors, then gas exchange and medium access are enabled, but air bubbles are introduced into the incubation cavity causing fluid turbulence and cell damage
Solution Approach 1:
The invention extracts the problematic sealing function from the lid and relocates it to a separate port closure system. The port closure with bayonet coupling mechanism handles sealing for gas exchange and medium access, while the lid itself becomes a simple access cover that can be quickly removed without introducing air bubbles or turbulence into the incubation cavity.
2Loss of substance
If the incubation cavity is fully enclosed to prevent dehydration, then moisture loss is reduced, but access for medium exchange and cell retrieval becomes difficult
Solution Approach 1:
The lid is segmented into a removable access portion and a sealed port portion. The port closure system with bayonet coupling provides sealed access for medium exchange without requiring full lid removal, while the main lid can be quickly removed for complete access when needed. This segmentation allows the system to maintain enclosure for moisture retention while enabling easy access operations.
3Ease of operation
If a removable lid design is implemented for easy access, then operational convenience is improved, but sealing effectiveness and humidity control may be compromised
Solution Approach 1:
The port closure system acts as an intermediary between the external environment and the incubation cavity. It provides sealed access points for gas exchange and medium addition/removal without requiring the lid to be removed. The bayonet coupling mechanism ensures reliable sealing while maintaining easy operation, thus mediating between the conflicting requirements of accessibility and sealing effectiveness.
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 design enhances cell growth by reducing dehydration, turbulence, and access challenges, enabling longer-term cultivation of differentiated cells with minimal disruption, and facilitating the removal of Spheriods without damage.
Implementation Method 1
the incubation cavity providing, in conjunction with, a semipermeable membrane (11 or 12) in the first end of the wall, allowing a gas exchange in the incubation chamber and retention of cells and cellular aggregates
Data Source
Figure 1
Figure 2
AI summary
There is provided a bioreactor which is provided with a lid (13) that facilitates access to the incubation cavity. Specifically the end wall of the incubation cavity is constituted by the lid (13) so that removal of the cap renders the incubation cavity fully accessible.