Electrosurgical Instrument with Switchable Return Electrodes
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Solution Overview
Problem
Existing electrosurgical systems face challenges in effectively switching between cutting and coagulation modes due to the need for different electrode configurations and the limitations of using the same return electrode for both functions, which restricts their performance in wet field or underwater surgeries.
Innovation Solution
An electrosurgical system with multiple electrodes, where the same active electrode is used for both cutting and coagulation, and switching between two return electrodes based on the required mode, allowing for optimized electrode separation and current paths to enhance cutting and coagulation effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same return electrode is used for both cutting and coagulation, then the device complexity is reduced, but the effectiveness of both cutting and coagulation operations deteriorates
Solution Approach 1:
The return electrode is segmented into two separate electrodes: a first return electrode optimized for cutting operations and a second return electrode optimized for coagulation operations. This segmentation allows each electrode to be specifically designed for its intended function, resolving the contradiction between device simplicity and operational effectiveness.
Solution Approach 2:
The electrosurgical instrument is designed with multi-functionality by incorporating both cutting and coagulation capabilities through the use of different return electrodes. The same active electrode can be used for both operations by switching between different return electrodes, achieving universality while maintaining optimal performance for each specific operation.
2Temperature
If the electrode separation is small, then the electric field intensity is high for effective cutting, but the coagulation area is restricted to a very small area
Solution Approach 1:
Different electrode separations are used for different operations: a small separation between the active electrode and the first return electrode for cutting (producing high electric field intensity), and a large separation between the active electrode and the second return electrode for coagulation (producing large-area coagulation). This local quality differentiation resolves the contradiction between cutting effectiveness and coagulation area.
3Device complexity
If the same active electrode is used for both cutting and coagulation, then the device complexity is reduced, but the performance in wet field or underwater surgeries deteriorates
Solution Approach 1:
The system dynamically switches between different return electrode configurations based on the surgical mode required. The switching means allows the instrument to adapt its electrode configuration in real-time, selecting the appropriate return electrode (first for cutting, second for coagulation) based on the operational requirements, thereby maintaining optimal performance in wet field or underwater conditions.
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
Enables effective cutting and coagulation from the same instrument by using different return electrodes for each operation, improving performance in both dry and wet field surgeries by promoting high electric field intensities for cutting and large-area coagulation.
Implementation Method 1
the electrosurgical generator including a source of radio frequency energy capable of producing either a coagulating RF waveform or a cutting RF waveform
Implementation Method 2
the generator uses the same electrode as an active electrode for both cutting and coagulation, but switches between using the first return electrode when RF cutting is required, and the second return electrode when RF coagulation is required
Data Source
Figure 1
Figure 2~4B
Figure 3
AI summary
An electrosurgical system includes an electrosurgical instrument and an electrosurgical generator, the instrument having a longitudinal axis and including at least first, second and third electrodes. The electrodes are spaced from each other by one or more insulating members therebetween, the spacing between the first and third electrodes being greater than that between the first and second electrodes. The electrosurgical generator includes a source of radio frequency energy capable of producing either a coagulating RF waveform or a cutting RF waveform and has first second and third output connections connected to the first, second and third electrodes respectively of the electrosurgical instrument. The generator further includes a switching means, and a controller, the controller being such that when a cutting RF waveform is selected, the switching means directs the cutting RF waveform between the first and second output connections and hence the first and second electrodes. When a coagulating RF waveform is selected, the switching means directs the coagulating RF waveform between the first and third output connections and hence the first and third electrodes.