Microfluidic Perfusion Cell Culture System with Bubble Trap
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Solution Overview
Problem
Conventional cell culture techniques fail to accurately simulate the 3D structure and environment of living cells, leading to inaccurate experimental results due to the 2D nature of cell culture and differences from in vivo conditions, which limits the study of cell interactions and responses.
Innovation Solution
A micro-fluidic perfusion cell culture system with a substrate featuring micro-fluid injection channels, branch channels, and well plates, where nutrient and oxygen distribution is controlled based on Poiseuille's law to achieve precise and varying flow rates, and includes a bubble trap to prevent channel clogging, allowing for continuous fluid supply and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional 2D cell culture is used, then the culture process is simple and easy to operate, but the experimental accuracy and simulation of in vivo conditions deteriorate
Solution Approach 1:
The patent transitions from conventional 2D monolayer cell culture to 3D cell culture by constructing a three-dimensional cell culture model using microfluidic technology. The microfluidic channel system enables cells to grow in a 3D matrix environment that better simulates in vivo conditions, thereby improving experimental accuracy while maintaining operational feasibility through automated fluid control
2Ease of operation
If conventional periodic media replacement is used, then the operation is simple, but the nutrient distribution uniformity and oxygen supply efficiency deteriorate
Solution Approach 1:
The patent implements continuous perfusion culture through microfluidic channels that continuously supply fresh culture media to the cell culture system. This continuous flow regime ensures uniform nutrient distribution and efficient oxygen supply to cells throughout the 3D matrix, eliminating the non-uniformity inherent in periodic media replacement methods
3Reliability
If microfluidic channels with very small sizes are used, then oxygen supply and nutrient diffusion are improved, but channel clogging by bubbles becomes a critical issue
Solution Approach 1:
The patent introduces a bubble trap as an intermediary component in the microfluidic system. This bubble trap captures and removes air bubbles from the culture media before the fluid enters the narrow microfluidic channels, preventing channel clogging while maintaining the benefits of continuous perfusion and efficient nutrient-oxygen supply to the 3D cell culture
4Ease of manufacture
If 2D cell culture with coating is used, then the culture setup is straightforward, but the simulation of in vivo 3D structure and cell interactions deteriorates
Solution Approach 1:
The patent employs 3D cell culture within microfluidic channels, allowing cells to form three-dimensional structures that better replicate in vivo tissue architecture. This 3D culture approach enables more accurate simulation of cell-cell and cell-matrix interactions, improving the physiological relevance of experimental results while maintaining relatively simple setup procedures through standardized microfluidic device fabrication
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
Enables accurate and controlled nutrient supply, facilitating the observation and quantitative evaluation of cell proliferation and tumor growth by simulating a 3D micro-environment, providing a more accurate representation of in vivo conditions.
Implementation Method 1
Lengths of the branch channels are different from each other so that the branch channels have different flow rates based on Poiseuille's law.
Implementation Method 2
the micro-fluidic system provides a physical environment similar to that of the living body and supplies a sufficient oxygen and facilitates a rapid diffusion of a nutrient at the same time
Data Source
AI summary
A micro-fluidic system for a perfusion cell culture is disclosed. The system includes: a substrate; a micro-fluid injection channel defined in the substrate to guide fluid in a plane direction of the substrate; at least two micro-fluid branch channels defined in the substrate, wherein the branch channels are branched from the micro-fluid injection channel; micro-fluid outlet channels defined in the substrate, wherein each of the outlet channels extends from a distal end of each branch channel to a top face of the substrate, wherein each outlet channel has each through-hole defined in the top face portion of the substrate; and well plates disposed on the top face of the substrate, wherein each of the well plates fluid-communicates with each outlet channel. The micro-fluidic system refers to a technique that adjusts a flow of liquid or gas of a very small amount (nanoliter or picoliter) in an extremely miniaturized device.