Electrosurgical Inverter with Crest Factor Control
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Solution Overview
Problem
Current electrosurgical systems face challenges in effectively controlling and delivering electrosurgical energy to tissue, particularly in achieving precise control over constant current, constant voltage, and constant power modes, which is crucial for various surgical procedures such as cutting, coagulation, and vessel sealing.
Innovation Solution
The system incorporates a DC-DC buck converter and a DC-AC boost converter, controlled by a controller that adjusts duty cycles to operate in constant current, constant voltage, or constant power modes, allowing for dynamic control of electrosurgical waveforms and crest factors, enabling precise energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single converter topology is used, then device complexity is reduced, but the ability to precisely control constant current, constant voltage, and constant power modes is compromised
Solution Approach 1:
The patent combines a DC-DC buck converter and a DC-AC boost converter into a single integrated electrosurgical generator system. The buck converter generates a DC waveform that serves as input to the boost converter, which then generates the electrosurgical waveform. This merging of two converter topologies enables precise control across multiple operating modes (constant current, constant voltage, constant power) while maintaining system integration.
Solution Approach 2:
The system dynamically switches between different converter configurations and control modes based on the desired electrosurgical output. The controller adjusts the duty cycles of both the buck and boost converters in real-time to maintain precise control over the electrosurgical waveform characteristics, enabling transition between constant current, constant voltage, and constant power modes as needed.
2Manufacturing precision
If duty cycle adjustment range is limited, then device simplicity is maintained, but power control precision and crest factor control are insufficient
Solution Approach 1:
The patent utilizes duty cycle as a controllable parameter to precisely adjust the output characteristics of the electrosurgical waveform. By varying the duty cycle of the buck converter and boost converter independently, the system can control both the power output and the crest factor of the generated waveform, achieving precise power control without requiring additional hardware 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
This solution enables precise and efficient energy delivery during electrosurgical procedures, minimizing unintentional charring and ensuring consistent power output, thereby improving the accuracy and effectiveness of surgical interventions.
Implementation Method 1
a DC-DC buck converter configured to output a DC waveform, the DC-DC buck converter including at least one first switching element operated at a first duty cycle
Implementation Method 2
a DC-AC boost converter coupled to the DC-DC buck converter and including at least one second switching element operated at a second duty cycle, the DC-AC boost converter configured to convert the DC waveform to generate at least one electrosurgical waveform
Implementation Method 3
Electrosurgery involves application of high radio frequency electrical current to a surgical site to cut, ablate, or coagulate tissue
Data Source
AI summary
An electrosurgical generator is provided. The generator includes a DC-DC buck converter configured to output a DC waveform, the DC-DC buck converter including at least one first switching element operated at a first duty cycle; a DC-AC boost converter coupled to the DC-DC buck converter and including at least one second switching element operated at a second duty cycle, the DC-AC boost converter configured to convert the DC waveform to generate at least one electrosurgical waveform; and a controller coupled to the DC-DC buck converter and the DC-AC boost converter and configured to adjust the first duty cycle and the second duty cycle to operate the at least one electrosurgical waveform in at least one of constant current, constant voltage, or constant power modes.