MCU-based Safer Coagulation Mode by Nonfixed Duty Cycle for an Electrosurgery Inverter.

Area of Science:

• Electrical Engineering
• Biomedical Engineering
• Power Electronics

Background:

• Pulsating coagulation mode is crucial for electrosurgery.
• Implementation challenges exist for precise control of active and blank periods.

Purpose of the Study:

• To implement and evaluate a pulsating coagulation mode using a GaN-based inverter.
• To introduce a novel nonfixed duty cycle approach for enhanced safety.
• To assess power tracking performance on diverse loads.

Main Methods:

• Utilized a TMS320F28379D microcontroller unit (MCU).
• Developed an output sampling and data-transferring strategy with direct memory access (DMA).
• Integrated a novel nonfixed duty cycle approach into a GaN-based high-frequency inverter.

Main Results:

• Successfully implemented a 390 kHz sinusoidal output during active periods with null outputs during blank periods.
• Demonstrated effective power tracking on resistive, R-C, and fresh biotissue loads.
• Showcased enhanced safety through the nonfixed duty cycle approach.

Conclusions:

• The proposed strategy enables precise control of pulsating coagulation mode in electrosurgery.
• The nonfixed duty cycle enhances safety and performance.
• The GaN-based inverter effectively manages power delivery for coagulation with arcing.