Multi-Pole Phase-Shifted RF Generator for Electrosurgery
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Solution Overview
Problem
Existing electrosurgical systems face challenges in controlling energy output to prevent tissue damage and achieve precise surgical effects, particularly in bipolar and monopolar modes, where unwanted charring or collateral damage can occur due to thermal spread and high current densities.
Innovation Solution
An electrosurgical generator with a multi-pole, phase-shifted RF output stage that includes dual-pole circuits with switching components and an isolation transformer, driven by a controller to generate phase-shifted frequencies and waveforms, allowing for precise control of RF energy delivery through multiple active electrodes, thereby minimizing tissue damage and optimizing surgical outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high radio frequency electrical current is applied to tissue to achieve cutting, ablation, coagulation or sealing, then surgical effects are achieved, but tissue damage and thermal spread occur
Solution Approach 1:
The system divides the RF energy delivery into multiple independent poles (at least two poles), allowing separate control of energy application at each pole. This segmentation enables precise localization of energy delivery to the target tissue while preventing excessive energy concentration that would cause thermal spread and collateral damage to adjacent structures.
Solution Approach 2:
The multi-pole configuration allows different energy levels and phases to be applied at different poles, creating localized zones of energy delivery. Each pole can be independently controlled to deliver energy only where needed, ensuring that surgical effects are achieved at the target site without causing damage to surrounding healthy tissue.
2Productivity
If multiple active electrodes are used to achieve desired ablation and lesion formation, then surgical effectiveness is improved, but control of energy output becomes more complex
Solution Approach 1:
The system employs phase-shifted oscillating signals to drive multiple active electrodes in a coordinated periodic manner. By applying sinusoidal or pulsed RF energy with specific phase relationships between poles, the system achieves effective ablation and lesion formation through constructive and destructive interference patterns, while the periodic nature simplifies control compared to independent continuous control of each electrode.
Solution Approach 2:
The system controls energy delivery by adjusting parameters such as phase shift angles, frequency, and amplitude of the RF signals applied to each pole. By varying these parameters, the system can precisely control the spatial distribution and intensity of energy delivery, achieving desired surgical effects while maintaining manageable control complexity through parameter optimization rather than structural complexity.
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 solution enables precise control of RF energy delivery, reducing tissue damage and thermal spread, allowing for effective coagulation, ablation, and vessel sealing while maintaining efficient energy distribution, thus enhancing the safety and efficacy of electrosurgical procedures.
Implementation Method 1
The RF output stage includes a plurality of dual-pole circuits, each of the plurality of dual-pole circuits including first and second pairs of switching components. The generator also includes a controller configured to drive the first and second pairs of switching components of each of the plurality of dual-pole circuits at a predetermined phase-shifted frequency.
Implementation Method 2
The RF output stage includes an isolation transformer having a secondary winding and a plurality of dual-pole circuits having first and second pairs of switching components and a primary winding coupled to the secondary winding.
Implementation Method 3
Electrosurgery involves application of high radio frequency electrical current to a surgical site to cut, ablate, coagulate or seal tissue.
Data Source
AI summary
An electrosurgical generator is disclosed. The generator includes a power supply operable to generate a DC voltage and a multi-pole, phase-shifted, pulse-width and/or frequency modulated RF output stage coupled to the power supply. The RF output stage includes a plurality of dual-pole circuits, each of the plurality of dual-pole circuits including first and second pairs of switching components. The generator also includes a controller configured to drive the first and second pairs of switching components of each of the plurality of dual-pole circuits at a predetermined phase-shifted frequency.