Electrosurgical Generator Inductor Current Control
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Solution Overview
Problem
Current electrosurgical generators face challenges in delivering precise control over energy delivery to tissue during surgical procedures, particularly in maintaining constant power, voltage, or current modes, which can lead to inefficient tissue treatment and potential tissue damage.
Innovation Solution
An electrosurgical generator system that includes converters and boost inverters configured to output DC and AC waveforms, with controllers adjusting duty cycles to maintain inductor current at predetermined values, allowing operation in constant current, voltage, or power modes, and switching between these modes based on impedance and feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrosurgical generators are used to deliver electrical current to tissue, then surgical procedures can be performed, but precise control over energy delivery is insufficient leading to inefficient tissue treatment and potential damage
Solution Approach 1:
The system implements a feedback control mechanism where the controller continuously monitors the electrical parameters (current, voltage, power) delivered to the tissue and adjusts the duty cycle of the pulse waveform accordingly. This closed-loop control ensures precise energy delivery while preventing overheating or unintended tissue damage, directly resolving the contradiction between measurement precision and treatment reliability
Solution Approach 2:
The system dynamically adjusts the duty cycle of the electrosurgical waveform in real-time based on the comparison between actual and target power levels. This dynamic control allows the system to adapt to changing tissue impedance and treatment conditions, maintaining precise control throughout the surgical procedure and ensuring reliable tissue treatment
2Measurement precision
If duty cycle is adjusted to control power delivery, then energy delivery precision is improved, but system complexity increases due to multiple converters and control mechanisms
Solution Approach 1:
The controller serves multiple functions: it generates the pulse waveform, adjusts the duty cycle for power control, monitors electrical parameters, and manages the switching between different operational modes. This multi-functionality consolidates control operations into a single device, reducing overall system complexity while maintaining precise power delivery control
Solution Approach 2:
The system controls power delivery by changing the duty cycle parameter of the pulse waveform rather than requiring separate control mechanisms for each electrical parameter. This single-parameter control approach simplifies the system architecture while achieving precise control over energy delivery to the tissue
3Stability of the object's composition
If constant power mode is maintained during electrosurgery, then consistent energy delivery is achieved, but adaptability to varying tissue impedance is reduced
Solution Approach 1:
The system dynamically adjusts the duty cycle in response to changing tissue impedance while maintaining the target power level. This dynamic adaptation allows the system to operate in constant power mode while automatically adjusting to varying tissue conditions, resolving the contradiction between power consistency and impedance adaptability
Solution Approach 2:
The feedback mechanism monitors both the electrical parameters and tissue response, allowing the controller to adjust the duty cycle to maintain constant power delivery despite changes in tissue impedance. This feedback-driven adaptation ensures both power consistency and impedance versatility are achieved simultaneously
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 system enables precise control over energy delivery, minimizing unintentional charring and ensuring consistent power delivery to tissue, thereby improving surgical outcomes by uniformly vaporizing, coagulating, or sealing tissue as needed.
Implementation Method 1
one or more converters (e.g., AC-DC converters) configured to output a DC waveform
Implementation Method 2
one or more boost inverters coupled to the converter and configured to convert the DC waveform to generate at least one electrosurgical waveform
Implementation Method 3
one or more inductors connected in series with the converter and the boost inverter. The inductor is configured to output an inductor current
Data Source
AI summary
An electrosurgical generator is provided. The electrosurgical generator includes at least one converter configured to output a DC waveform and a nonlinear carrier control current. At least one boost inverter is coupled to the at least one converter and is configured to convert the DC waveform to generate at least one electrosurgical waveform. At least one inductor is connected in series with the at least one converter and at least one boost inverter and is configured to output an inductor current. A controller is coupled to the at least one converter and the at least one boost inverter and is configured to maintain the inductor current at a predetermined value by controlling a pulse duration of a duty cycle of the at least one converter based on a comparison of inductor current and the nonlinear control current.