Microfluidic Electroporation Device for Cell Transfection
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Solution Overview
Problem
Conventional methods for cell transfection, such as viral transduction and mechanical electroporation, face challenges in efficiency, cell viability, and scalability, particularly when delivering genetic material across cell membranes, especially for primary cells and specific cargo like DNA.
Innovation Solution
A microfluidic device with a semipermeable membrane and electrode system that temporarily immobilizes cells within an electric field for precise electroporation, enhancing cargo delivery efficiency while maintaining cell viability and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viral transduction is used to transfer genes into T cells, then transfection efficiency can be achieved, but cell viability and scalability are compromised
Solution Approach 1:
The patent replaces viral transduction (biological system) with electroporation (physical/mechanical system). The electroporation device uses controlled electric fields to create temporary pores in cell membranes, enabling direct DNA uptake without viral vectors. This substitution eliminates the limitations of viral transduction regarding scalability while maintaining high transfection efficiency, as the mechanical electroporation process can be easily scaled by adjusting electric field parameters and processing volume.
2Productivity
If mechanical electroporation is used for gene transfer, then scalability is improved, but transfection efficiency and cell viability deteriorate
Solution Approach 1:
The patent employs precise control of electroporation parameters including electric field strength, pulse duration, pulse number, and waveform characteristics. By optimizing these parameters, the system achieves high transfection efficiency while maintaining cell viability. The ability to dynamically adjust parameters allows scaling the process without sacrificing efficiency, as parameter sets can be optimized for different cell types and cargo while maintaining consistent performance across scales.
3Reliability
If conventional electroporation methods are used, then cell membrane permeability is increased for cargo delivery, but cell damage and reduced viability occur
Solution Approach 1:
The patent uses pulsed electric fields with controlled duration and frequency to create temporary membrane permeability. The periodic nature of the pulses allows membrane recovery between applications, preventing permanent damage. The system applies multiple short pulses rather than one long pulse, creating transient pores that close after cargo delivery, thus maintaining cell viability while achieving efficient cargo delivery.
4Reliability
If high electric field strength is applied for effective electroporation, then transfection efficiency improves, but cell viability and cargo delivery precision worsen
Solution Approach 1:
The patent employs focused electric field application through microelectrode arrays that create localized high-field regions. This allows strong electric fields to be applied precisely where needed (at the cell membrane level) without exposing entire cell populations to uniformly high fields that would cause damage. The localized field application enables efficient transfection at the target site while maintaining overall cell viability and precise cargo delivery control.
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
The system improves transfection efficiency, maintains cell viability, and allows for precise control of cargo delivery, overcoming limitations of conventional methods by using fluid flow to immobilize cells and convectively remove heat during electroporation.
Implementation Method 1
a semipermeable membrane having a first side that is attached to the opposing second side of the first substrate and that spans the first channel
Implementation Method 2
an electrode operable to generate an electric field in the first channel
Implementation Method 3
convectively remove heat during electroporation
Data Source
AI summary
Microfluidic devices and associated methods are disclosed. A microfluidic device includes a target entrainment channel and an effluent channel on opposing sides of a semipermeable membrane. A restrictor channel that is narrower than the effluent channel is interposed between the semipermeable membrane and the effluent channel. Fluid that flows from the target entrainment channel, through the semipermeable membrane and the restrictor channel to the effluent channel, pins target cells along the center of the target entrainment channel for electroporation using an electrode in the channel.