Impedance-Based Electroporation Pulse Control for Gene Delivery
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Solution Overview
Problem
Current methods for in vivo gene delivery via electroporation face challenges in variability between patients due to differences in tissue properties and conductance, leading to inconsistent and inefficient delivery, as they rely on standardized electrical parameters without accounting for individual variations.
Innovation Solution
The method involves applying localized temperature increases and using impedance-based feedback to adjust electroporation pulse parameters, allowing for real-time control and optimization of DNA delivery, reducing the magnitude of pulses required and enhancing targeting and control within tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standardized electrical parameters are used for electroporation delivery, then the delivery process is simple and reproducible, but the delivery efficiency and gene expression vary significantly between patients due to tissue property variations
Solution Approach 1:
The patent implements dynamic adjustment of electroporation pulse parameters based on real-time impedance measurements. The system transitions from fixed standardized parameters to adaptive parameters that change during the delivery process according to measured tissue impedance, allowing optimization for each patient's specific tissue properties while maintaining procedural simplicity through automated control.
Solution Approach 2:
The patent employs feedback control by continuously measuring tissue impedance during electroporation and using this information to adjust pulse parameters. The impedance measurements provide real-time information about tissue state, enabling the system to adapt pulse width, amplitude, and number of pulses to achieve consistent gene expression across different patients despite variations in tissue properties.
2Productivity
If empirically derived electroporation parameters are used, then average biological response is achieved, but individual patient variation cannot be compensated for
Solution Approach 1:
The system measures tissue impedance in real-time during the electroporation process and uses this feedback to adjust pulse parameters for each individual patient. This eliminates reliance on average empirical parameters by providing patient-specific optimization based on actual tissue properties measured during treatment, thereby improving consistency across patients while maintaining high gene expression levels.
Solution Approach 2:
The patent changes electroporation parameters (pulse width, amplitude, number of pulses) based on measured impedance values. By dynamically adjusting these parameters according to real-time measurements rather than using fixed empirical values, the system achieves both high average gene expression and improved patient-to-patient consistency.
3Productivity
If higher magnitude pulses are applied to ensure delivery, then gene expression increases, but tissue damage and safety risks increase
Solution Approach 1:
The system uses real-time impedance measurements to monitor tissue response during electroporation and adjusts pulse magnitude accordingly. This feedback control prevents excessive pulse application that could cause tissue damage while ensuring sufficient delivery for gene expression, thereby improving the safety profile without sacrificing productivity.
Solution Approach 2:
The patent applies electroporation pulses adaptively based on measured impedance rather than using fixed high-magnitude pulses. By applying only the necessary pulse magnitude required for effective delivery (determined through impedance monitoring), the system avoids excessive action that would cause tissue damage while maintaining sufficient gene expression levels.
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 results in a significant increase in gene expression, up to 15-fold, with reduced variability and improved safety and reliability, moving gene therapy closer to recombinant protein drug therapy by enabling more precise and controlled molecule delivery.
Implementation Method 1
The accepted mechanism for gene delivery by electroporation (EP) is that direct current (DC) pulses temporarily weaken the barrier properties of cell membranes which ultimately initiates/mediates the entry of exogenous DNA into cells.
Implementation Method 2
It was found that modest localized temperature increases in skin (43° C.) during DNA delivery resulted in an 8-fold increase in expression.
Implementation Method 3
adjusting pulse parameters during electrical treatment based upon real-time tissue impedance measurements resulted in between 6- to 15-fold increases in expression
Data Source
AI summary
A method and system for delivering a molecule to a specific area of a tissue by controlling temperature and impedance is presented. The method is generally comprised of applying heat to a biological structure, such as cells or tissues, to heat the biological structure to a preset temperature after which at least one electroporation pulse is administered to the biological structure. Impedance is measured as a feedback control mechanism after each pulse and pulse parameters are adjusted accordingly until desired impedance is reached. The system generally comprises an electroporation system capable of generating at least one pulse, measuring impedance and measuring temperature.