Asymmetric RF Electrode for Precise Tissue Ablation
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Solution Overview
Problem
Current RF electrode systems for tissue ablation often result in symmetric heat lesions, limiting the ability to precisely control the size and location of the ablation area, especially when using straight electrodes with side-outlet configurations.
Innovation Solution
The use of RF electrodes with straight, stiff shafts that extend from a side opening in the cannula, allowing for asymmetric heat lesion formation by conducting RF current from both the cannula active tip and the electrode shaft, which remains straight over its entire length, including within and around the cannula side opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If straight electrodes with side-outlet configurations are used, then the electrode placement is simplified, but the heat lesion symmetry is limited and ablation precision is reduced
Solution Approach 1:
The patent applies asymmetry by configuring the electrode shaft to extend beyond the cannula at a specific angle (e.g., 45 degrees) rather than symmetrically. This asymmetric extension allows the RF current to be delivered at an angle to the tissue surface, creating an asymmetric heat lesion pattern that provides better control over the ablation area shape and size while maintaining the simplicity of side-outlet electrode placement
2Power
If RF current is conducted from both cannula active tip and electrode shaft, then tissue heating is increased and ablation effectiveness is enhanced, but the complexity of current distribution control increases
Solution Approach 1:
The patent merges the function of the cannula active tip and the electrode shaft into a unified RF current delivery system. Both components are electrically connected to deliver RF current simultaneously, creating a combined heating effect that enhances tissue ablation effectiveness. The electrical connection is achieved through direct contact or conductive coupling between the electrode shaft and cannula, integrating two elements into one functional unit for current distribution
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 configuration enables the generation of larger, asymmetric RF heat lesions, allowing for more precise control over the ablation area and increased tissue heating, enhancing the effectiveness of RF ablation procedures.
Implementation Method 1
heating of the target tissue by RF power dissipation of the RF signal output in the target tissue
Data Source
AI summary
An RF electrode can have a straight shaft to generate an RF heat lesion that is asymmetric about the central axis of the cannula through which the RF electrode is introduced into bodily tissue. An electrode can be inserted into a cannula, and an electrosurgical generator can apply current between the active tip of the electrode and the active tip of the cannula to heat tissue.