High Frequency Generator Arc Ignition Control
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Solution Overview
Problem
High frequency generators for electrosurgical cutting face challenges in achieving controlled guidance due to excessive tissue penetration, particularly with large-area electrodes, where initial cutting support requires multiple pulses to ignite an arc, leading to unnecessary waiting times for operators during procedures like endoscopic mucosal resection and polypectomy.
Innovation Solution
A high frequency generator with an arc detector and adaptive power control that delivers high power for initial cutting support, followed by reduced power for a cutting phase if an arc is ignited, and low or no power for a short pause interval if no arc is formed within a predetermined duration, optimizing the power sequence based on arc presence to reduce waiting times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple high power pulses are delivered for initial cutting support to ignite an arc with large-area electrodes, then arc ignition is achieved, but waiting time increases and productivity decreases
Solution Approach 1:
The system dynamically adjusts the pause interval duration based on arc detection results. When no arc is detected after maximum initial cutting support pulses, the pause interval is automatically shortened, converting a fixed sequential process into a dynamic adaptive process that eliminates unnecessary waiting time while maintaining arc ignition reliability.
Solution Approach 2:
The system uses arc detection feedback to control the power delivery sequence. The arc detector monitors whether an arc has been ignited, and this feedback information determines whether to continue with the standard pulse sequence or to shorten the pause interval, creating a closed-loop control system that optimizes both reliability and productivity.
2Reliability
If a fixed pause interval is used after initial cutting support, then tissue coagulation is achieved, but unnecessary waiting time occurs when arc ignition fails
Solution Approach 1:
The pause interval transitions from a fixed predetermined duration to a dynamic variable duration based on arc detection outcomes. When arc ignition fails, the system automatically shortens the pause interval, making the coagulation process adaptive rather than static, thereby reducing unnecessary time loss while preserving coagulation effectiveness when needed.
Solution Approach 2:
Arc detection feedback directly controls the pause interval duration. The system monitors arc presence and uses this information to adjust the subsequent pause interval length, creating a feedback-driven adaptive coagulation process that eliminates wasted time when arc ignition is unsuccessful.
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 approach shortens the time to arc ignition and eliminates unnecessary waiting times during procedures, providing a better initial cut characteristic and improved control over electrosurgical cutting, especially with large-area electrodes.
Implementation Method 1
power control serves for controlling the electrical power delivered by way of the output terminal... a very high level of power is delivered in order to rapidly dry out the body tissue bearing against the cutting electrode, and thereby rapidly to achieve a high tissue impedance necessary to produce an arc
Implementation Method 2
an arc detector and a power control which is so adapted that initially for a phase for initial cutting support it causes the delivery of a high output power
Data Source
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AI summary
The invention concerns a high frequency generator for the connection of an electrosurgical instrument comprising an electrical output terminal for an electrosurgical instrument, a current or voltage source connected at least indirectly to the output terminal, an arc detector, and a power control for controlling the electrical power delivered by way of the output terminal, wherein the power control is adapted firstly to cause the delivery of a high output power for a phase for the initial cutting support and subsequently thereto either if ignition of an arc has occurred during t he phase for initial cutting support for a predetermined period of time of a cutting phase to cause the delivery of a power which is reduced in relation to the high power and subsequently for a predetermined period of time of a long pause interval to cause the delivery of no power or a lower power at which no arc occurs, or if no ignition of an arc has occurred du ring the phase for initial cutting support to cause the delivery of no power or a lower power for a predetermined period of time of a short pause interval.