Avalanche-Mediated Cell Permeabilization via Plasma Discharge
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Solution Overview
Problem
Current methods for delivering DNA and other small molecules into biological cells, such as electroporation, often result in high cell death rates and difficulties with in situ applications, necessitating the development of novel methods for efficient molecular transfer.
Innovation Solution
A method and apparatus utilizing a non-uniform electric field to generate a vapor bubble and plasma discharge between an avalanche electrode and a conductive fluid, creating a mechanical stress wave and electric field that permeabilizes cellular membranes, allowing for the transfer of agents into cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electroporation is used to deliver DNA and other small molecules into biological cells, then molecular transfer efficiency is improved, but cell death rate increases
Solution Approach 1:
The invention changes the physical parameters of the delivery method by using a non-uniform electric field with extremely high gradient (10^6-10^9 V/cm) compared to traditional electroporation (10^2-10^4 V/cm). This parameter change enables molecular transfer through a different mechanism (plasma discharge and shock wave) that does not rely on prolonged membrane permeabilization, thereby reducing cell death while maintaining transfer efficiency
Solution Approach 2:
The invention replaces the traditional electroporation mechanism (sustained electric field causing membrane pore formation) with a plasma discharge mechanism followed by shock wave delivery. The plasma discharge creates a highly localized energy deposition that generates a shock wave, substituting the gradual mechanical stress of electroporation with a more focused, transient mechanical impulse that achieves molecular transfer with less cellular damage
2Productivity
If traditional electroporation methods are used, then molecular transfer is achieved, but spatial control is difficult
Solution Approach 1:
The invention applies local quality by creating a highly non-uniform electric field where the field gradient is concentrated at the tip of the electrode rather than distributed uniformly. This localized field concentration (10^6-10^9 V/cm at the tip versus much lower fields elsewhere) enables precise spatial control of plasma discharge and shock wave generation, allowing molecular transfer to be targeted to specific locations while leaving surrounding areas unaffected
Solution Approach 2:
The invention segments the electric field application by using a focused electrode tip that divides the field into a highly concentrated region (at the tip where plasma discharge occurs) and a dispersed region (surrounding areas with minimal field strength). This segmentation allows the active treatment zone to be spatially separated from inactive zones, improving precision in controlling where molecular transfer occurs
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 effectively transfers a wide range of agents, including DNA, RNA, and proteins, into various cell types with reduced cell death and improved spatial control, achieving higher transfection efficiencies compared to traditional electroporation methods.
Implementation Method 1
generating a vapor bubble and plasma discharge between an avalanche electrode and a conductive fluid surrounding the cell
Implementation Method 2
The portion of the electric field around the avalanche electrode must be strong enough to generate the plasma discharge and the vapor bubble
Implementation Method 3
The vapor bubble and plasma discharge generate a mechanical stress wave
Implementation Method 4
The combination of this mechanical stress wave and electric field results in permeabilization of the cell
Data Source
AI summary
The present invention provides a method and apparatus for transferring an agent into a cell. The method includes the steps of providing an agent outside of a cell and generating a vapor bubble and a plasma discharge between an avalanche electrode and a conductive fluid surrounding the cell. The vapor bubble and plasma discharge generate a mechanical stress wave and an electric field, respectively. The combination of this mechanical stress wave and electric field results in permeabilization of the cell, which in turn results in transfer of the agent into the cell.