Movable Pin Cell Culture System for 3D Assays
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Solution Overview
Problem
Current cell-based assay systems face challenges such as complexity, robustness, flexibility, and cost-effectiveness, particularly with issues like air bubble blockages in microfluidic systems, limitations in non-proliferating cell cultures, and hydrogel impacts on diffusion and assay results in 3D-cell culture pillar systems.
Innovation Solution
A movable pin cell culture system that supports both 2D and 3D cell cultures, allowing for simultaneous testing of various cell types, with pins having adaptable surfaces for cell seeding and a pin support system that includes a groove channel and reservoir for medium circulation, enhancing handling and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microfluidic systems are used for cell culture, then fluid flow control is improved, but the system becomes prone to blockage by air bubbles and cell clusters
Solution Approach 1:
The system divides the cell culture environment into separate compartments: a lower chamber for cell culture and an upper chamber for medium reservoir. This segmentation prevents blockages by allowing free movement of medium in the upper chamber while keeping the lower chamber accessible for cell growth, eliminating the blockage issues inherent in continuous microfluidic channels.
Solution Approach 2:
A porous membrane acts as an intermediary between the lower cell culture chamber and the upper medium reservoir. This membrane allows selective passage of nutrients and waste while preventing cell clusters and air bubbles from blocking the medium flow path, thus maintaining reliability without compromising fluid control.
2Adaptability or versatility
If 3D-cell culture pillar system with hydrogel is used, then 3D cell culture capability is improved, but large molecule diffusion and assay results are impacted
Solution Approach 1:
The system provides different local environments for different culture needs: the lower chamber offers open space for 3D cell culture without hydrogel constraints, while the porous membrane provides selective filtration. This local quality differentiation allows 3D culture capability without the negative impacts of hydrogel on large molecule diffusion.
3Ease of manufacture
If hydrogel is used to immobilize cells in pillar system, then cell immobilization is achieved, but evaporation occurs due to short solidification time
Solution Approach 1:
Cells are first seeded and allowed to attach to the porous membrane in the lower chamber before the upper chamber is assembled. This preliminary action allows cell immobilization without requiring rapid hydrogel solidification, thus preventing evaporation issues while achieving stable cell attachment.
4Ease of operation
If movable pin system is used for cell culture, then flexibility and ease of handling are improved, but device complexity increases
Solution Approach 1:
The movable pin system serves multiple functions: it acts as both the cell culture substrate and the transfer mechanism. The pins can be moved between the lower and upper chambers, eliminating the need for separate culture vessels and transfer equipment, thus improving ease of operation without proportionally increasing device complexity.
Data Source
AI summary
The present invention provides cell assay systems and its use in cell based assays.