Microfluidic Cell Culture System with Bypass Channel
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Solution Overview
Problem
A significant percentage of microfluidic structures in existing microfluidic cell culture systems are unsuitable for first use due to pressure fluctuations and pressure differences during transport, leading to rupture, irregularities, and disruptions in the cell culture medium and cells, affecting the viability and barrier function of cultured cells.
Innovation Solution
The microfluidic cell culture system design includes a communication channel between the first and second reservoirs that bypasses the cell culture chamber, with lower fluidic resistance than the cell culture chamber, and incorporates capillary pressure barriers and a reversible solidifying medium to absorb pressure fluctuations, ensuring the integrity of the cell culture during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the microfluidic structure is sealed with a detachable seal during transport, then protection against contamination is improved, but pressure fluctuations during transport cause rupture and disruptions in the cell culture medium and cells
Solution Approach 1:
The fluid communication path is segmented into two separate routes: one through the cell culture chamber and another through an alternative communication channel. This segmentation allows pressure fluctuations to be absorbed by the alternative channel without transmitting damage to the cell culture chamber, while the detachable seal maintains overall system protection.
Solution Approach 2:
The alternative communication channel acts as an intermediary element between the first and second reservoirs. It mediates pressure changes by providing a bypass route that equalizes pressure differences without forcing them through the vulnerable cell culture chamber, thus protecting the cells and medium.
2Productivity
If the fluidic resistance through the cell culture chamber is low, then medium flow through the chamber is improved, but pressure differences during transport cause rupture and irregularities in the cell culture medium
Solution Approach 1:
The fluid communication system is divided into two parallel paths: the cell culture chamber pathway optimized for medium flow during operation, and an alternative communication channel with higher fluidic resistance that serves as a pressure equalization pathway during transport. This segmentation allows each pathway to be optimized for its specific function without compromise.
Solution Approach 2:
The system utilizes parameter changes in fluidic resistance between operational and transport states. During operation, the cell culture chamber has low fluidic resistance for optimal medium flow. During transport, the alternative channel's higher resistance characteristics help dampen pressure fluctuations, and the reversible solidifying medium further modifies the fluid parameters to prevent rupture.
3Reliability
If a reversible solidifying medium is added to absorb pressure fluctuations, then protection against pressure damage is improved, but device complexity and handling steps increase
Solution Approach 1:
The reversible solidifying medium exploits phase transitions between solid and liquid states to provide pressure protection during transport. When solidified, the medium becomes rigid and resistant to pressure fluctuations. The phase transition is reversible, allowing the medium to return to liquid state at the destination for normal operation. This physical phenomenon provides automatic protection without requiring complex mechanical structures.
Solution Approach 2:
The reversible solidifying medium is prepared in advance and placed in the reservoirs before transport. It is configured to solidify under transport conditions, proactively protecting the cell culture chamber from pressure damage before any harm can occur. This preliminary preparation simplifies the overall system by using a passive, pre-configured protection mechanism rather than requiring active control systems during transport.
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 significantly reduces the number of microfluidic structures unsuitable for use by neutralizing pressure fluctuations, maintaining the integrity and viability of cells and cell cultures during transport, and allows for easy reconfiguration after transport by liquefying the solidifying medium.
Implementation Method 1
a reversible solidifying medium to absorb pressure fluctuations
Implementation Method 2
the fluctuations in pressure during transport and any pressure difference build up between reservoirs of the microfluidic structure is neutralized by the communication channel
Implementation Method 3
incorporates capillary pressure barriers and a reversible solidifying medium to absorb pressure fluctuations
Data Source
AI summary
The present invention relates to a microfluidic cell culture system comprising at least one microfluidic structure, wherein the at least one microfluidic structure comprises a cell culture chamber, a first and second reservoir in fluid communication with each other via the cell culture chamber, wherein the microfluidic cell culture system further comprises a detachable seal for sealing the at least one microfluidic structure and wherein the microfluidic cell culture system is configured such that the first and second reservoir of the at least one microfluidic structure are in fluid communication with each other via a communication channel that does not comprise the cell culture chamber.