Electrosurgical Generator Leakage Compensation and RF Modulation
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Solution Overview
Problem
Current electrosurgical systems using atmospheric pressure discharge cold plasma applicators face challenges such as low precision accuracy, collateral damage to healthy tissue, and the generation of noxious smoke due to high power electrosurgical energy, especially in applications requiring precise tissue cutting and coagulation.
Innovation Solution
An electrosurgical system with an integrated closed-loop system that includes a plasma generator and an electrosurgical generator, where the transformer is positioned within the applicator rather than the generator, allowing for lower thermalization effects and precise control of electrosurgical energy delivery through dynamic leakage current compensation and RF modulation algorithms to optimize power and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power electrosurgical energy is used for tissue cutting and coagulation, then cutting effectiveness and hemostasis are improved, but collateral damage to surrounding healthy tissue increases and noxious smoke is generated
Solution Approach 1:
The patent applies local quality by creating a highly focused plasma beam with concentrated energy delivery at the precise treatment site. The plasma arc is confined to a narrow pathway between the electrode and target tissue, enabling high power density locally while minimizing energy dispersion to surrounding healthy tissue. This localized energy concentration achieves effective cutting and coagulation without the collateral damage associated with broader electrosurgical energy distribution.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting plasma generation parameters including gas flow rate, RF power level, and electrode positioning. By optimizing these parameters, the system achieves high power delivery for effective tissue treatment while controlling the plasma arc characteristics to reduce smoke generation and prevent damage to adjacent healthy tissue. The ability to modulate power and gas flow allows precise control over the therapeutic window.
2Ease of operation
If atmospheric pressure discharge cold plasma is used for tissue treatment, then physical contact between electrode and tissue is eliminated, but precision accuracy decreases due to plasma beam width
Solution Approach 1:
The patent applies dynamics by implementing real-time feedback control that continuously monitors plasma arc characteristics and adjusts electrode positioning and power delivery accordingly. The system dynamically adapts to maintain optimal plasma arc confinement and focus, compensating for variations in tissue properties and electrode-tissue distance. This dynamic control enables precise contactless treatment by actively maintaining the plasma beam within the desired treatment zone despite operational variations.
Solution Approach 2:
The patent utilizes feedback mechanisms by sensing plasma arc parameters such as impedance, power consumption, and arc stability in real-time. This feedback information is used to adjust RF power delivery and electrode positioning to maintain precise plasma arc confinement. The closed-loop control system ensures that the plasma beam remains focused on the target tissue, achieving high precision accuracy despite the contactless nature of the treatment.
3Device complexity
If the transformer is positioned within the generator rather than the applicator, then system complexity is reduced, but thermalization effects increase and power delivery precision decreases
Solution Approach 1:
The patent applies segmentation by dividing the electrosurgical system into functionally independent modules: a simplified generator for power generation and control, and a separate applicator containing the transformer and plasma generation components. This segmentation allows the transformer to be positioned close to the treatment site in the applicator, minimizing thermalization effects and enabling precise power delivery control at the point of application. The modular architecture manages system complexity through standardized interfaces while optimizing thermal and electrical performance.
4Ease of manufacture
If simple surgical knife is used for tissue excision followed by cold plasma applicator for cauterization, then two-step procedure is performed, but treatment time increases and procedural efficiency decreases
Solution Approach 1:
The patent merges the cutting and coagulation functions into a single integrated plasma-based device. The plasma beam simultaneously performs both tissue excision and hemostasis through controlled energy delivery, eliminating the need for separate surgical knife and cauterizer steps. This consolidation maintains procedural simplicity while dramatically improving treatment speed and efficiency, as the plasma arc can transition between cutting and coagulation modes without requiring device changes or additional manual intervention.
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 faster, more precise cutting with minimal collateral damage and improved hemostasis, reducing tissue eschar and mechanical cutting resistance, while maintaining low power consumption and minimizing tissue damage.
Implementation Method 1
Gas plasma is an ionized gas capable of conducting electrical energy. Plasmas are used in surgical devices to conduct electrosurgical energy to a patient. The plasma conducts the energy by providing a pathway of relatively low electrical resistance.
Implementation Method 2
Electrosurgical systems that do not incorporate a source of regulated gas can ionize the ambient air between the active electrode and the patient. The plasma that is thereby created will conduct the electrosurgical energy to the patient.
Implementation Method 3
An electrosurgical system with an integrated closed-loop system that includes a plasma generator and an electrosurgical generator, where the transformer is positioned within the applicator
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The present disclosure is directed toward an electrosurgical apparatus including an electrosurgical generator that may be coupled to an electrosurgical applicator. In one aspect of the present disclosure, a controller of the electrosurgical generator is configured to execute a dynamic leakage current compensation algorithm or function to compensate for the leakage current of an electrosurgical applicator and accompanying cable coupling the electrosurgical applicator to electrosurgical generator. In another aspect of the present disclosure, the controller of the electrosurgical generator is configured to execute a dynamic radio frequency modulation algorithm or function to dynamically control the crest factor of the output waveform of the electrosurgical generator based on the measured impedance across an active and return terminal of the electrosurgical generator.