Porated Cell Ejection in Microfluidic Transfection
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Solution Overview
Problem
Current transfection methods, such as viral, lipofection, and electrotransfection, are labor-intensive and often introduce unwanted components into cells, limiting the efficiency and versatility of nucleic acid introduction into cells.
Innovation Solution
A microfluidic device with electrodes creating an electrical field within a channel to porate cells, combined with an ejection system for precise cell handling and transfection element delivery, allowing for controlled and efficient transfection of cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual batch-by-batch cell handling is used in electrotransfection, then flexibility in exploring transfection conditions is possible, but the process becomes labor-intensive and time-consuming
Solution Approach 1:
The device segments the transfection process into individual cell-level operations within a microfluidic channel. Each cell is captured, porated, and transfected separately in a controlled sequence, enabling high-throughput automated processing while maintaining the ability to explore different transfection conditions for each cell
Solution Approach 2:
The system enables dynamic adjustment of electrical field parameters (voltage, pulse duration, frequency) during the transfection process. This allows exploration of various transfection conditions by changing electrical parameters without manual intervention, resolving the contradiction between adaptability and productivity
2Productivity
If electrodes are placed close together to create strong electric field for poration, then transfection efficiency increases, but cell lysis and unwanted substance introduction increase
Solution Approach 1:
The device creates a highly localized electric field precisely at the cell capture site within the microfluidic channel. The electrodes are positioned to generate intense electric field only where needed for poration, while surrounding areas maintain normal conditions. This localized approach achieves high transfection efficiency without causing widespread cell lysis or introducing unwanted substances
Solution Approach 2:
The microfluidic channel structure acts as an intermediary that confines and controls the electric field application. The channel geometry and electrode positioning work together to mediate the electric field distribution, ensuring intense field only at the target cell location while protecting surrounding cells from harmful effects
3Productivity
If automated high-throughput cell processing is implemented, then productivity increases, but reproducibility and control of electric field application decrease
Solution Approach 1:
The device design ensures that each cell captured in the microfluidic channel experiences a consistent and reproducible electric field environment. The electrode geometry and positioning create uniform field conditions at each capture site, ensuring reproducibility across high-throughput processing. The automated system maintains equipotential conditions for each cell-transfection event
Solution Approach 2:
The system incorporates feedback mechanisms that monitor and control electric field application during automated processing. This ensures consistent field parameters are applied to each cell, maintaining reproducibility while enabling high-throughput operation through automated control and real-time adjustments
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 increases reproducibility and transfection efficiency by ensuring consistent electric field application and precise cell handling, enabling the exploration of various transfection conditions with reduced labor and minimizing unwanted substance introduction.
Implementation Method 1
electrodes placed at opposite ends of the microfluidic channel to create an electrical field within the channel
Implementation Method 2
electrotransfection (i.e., transfection via electroporation)... using an electric field to cause pores to form in the surface of the cell membrane
Implementation Method 3
an ejection device to eject at least one cell porated within the electrical field
Data Source
AI summary
A microfluidic device may include a microfluidic channel including an electrode placed at opposite ends of the microfluidic channel to create an electrical field within the channel and an ejection device to eject at least one cell porated within the electrical field. A cassette may include a substrate, a die coupled to the substrate, a microfluidic channel defined within the die, the microfluidic channel including a necked portion to receive a cell therein and at least two electrodes each placed at a first and a second end of the microfluidic channel to apply an electric field to the cell above a proration threshold and a cell ejection device to eject the cell from the die.