Close-Field Electroporation Electrode Arrays for Cochlear Gene Delivery
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Solution Overview
Problem
Current electroporation methods for gene delivery are inefficient and non-specific, particularly in targeting cells within the mature bony cochlea, due to high voltages required and difficulty in electrode placement, leading to potential tissue damage and limited transformation efficiency.
Innovation Solution
The use of close-field electroporation (CFE) with a configuration of anode and cathode arrays separated by a short distance (10 μm to 5 mm) to generate a high electric field within a target region, allowing for efficient and targeted transfection of cells using lower voltages and reduced total charge, as demonstrated by the application of a cochlear implant electrode array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electroporation methods are used with plate electrodes or penetrating needle electrodes, then gene delivery can be achieved, but transformation efficiency is low and electrode placement is difficult
Solution Approach 1:
The electrode system is segmented into multiple small-diameter electrodes (e.g., 0.5-2 mm spacing) arranged in arrays, allowing flexible placement within the cochlea while maintaining effective electric field generation for gene delivery
Solution Approach 2:
The invention transitions from conventional 2D plate electrodes to 3D arrays of small-diameter electrodes that can be inserted into the cochlear structure, enabling gene delivery in the complex anatomical space of the mature bony cochlea
2Reliability
If high voltages are applied to destabilize the cell membrane, then electroporation can occur, but target organs and tissues are detrimentally affected and DNA stability is impacted
Solution Approach 1:
The electric field is concentrated locally at the electrode-tissue interface through small-diameter electrodes, achieving effective electroporation (transient dielectric breakdown) at lower voltages while minimizing damage to surrounding tissues and maintaining DNA stability
Solution Approach 2:
The invention changes the electrode geometry parameters (small diameter, close spacing) to achieve effective electroporation at lower voltage thresholds, reducing the harmful effects of high voltage application on target organs and DNA
3Productivity
If conventional electrode configurations are used, then electroporation can be performed, but specificity for the region targeted for transformation is limited
Solution Approach 1:
The electrode array is segmented into multiple small-diameter electrodes that can be selectively activated, allowing precise targeting of specific cochlear regions for gene transformation while minimizing effects on surrounding areas
Solution Approach 2:
The electric field is localized to specific regions by using small-diameter electrodes with controlled spacing, achieving high spatial specificity for gene delivery to targeted cells such as spiral ganglion cells in the cochlea
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
CFE achieves higher transformation efficiency and specificity with lower voltages and reduced collateral damage, enabling effective gene delivery to cells in the cochlea, such as spiral ganglion cells, and improving cochlear implant performance by promoting neurite outgrowth and reducing stimulation currents.
Implementation Method 1
an electric field generated by a high voltage pulse between two electrodes causes a transient dielectric breakdown of the plasma membrane of cells within the high intensity electric field, enabling the negatively-charged DNA to enter the cells
Implementation Method 2
exposing said one or more cells to said agent and to a close electric field created between an anode or anode array and a cathode or cathode array
Data Source
AI summary
The present invention relates to improved methods for transfecting one or more cells within a target region with an agent by electroporation. The method comprises exposing one or more cells to the agent and to a close electric field created between an anode or anode array and a cathode or cathode array in the target region for sufficient time to allow at least some of the agent to enter said one or more cells.