Multi-Phase RF Generator for Simultaneous Tissue Cutting and Coagulation
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Solution Overview
Problem
Existing electrosurgical generators lack the capability to simultaneously deliver phase-displaced RF output voltage waveforms across multiple electrodes, limiting their effectiveness in both cutting and coagulation processes during surgical procedures.
Innovation Solution
An electrosurgical generator with a multiple-phase RF output stage that delivers phase-displaced RF output voltage waveforms across at least three electrodes, utilizing a three-phase output transformer with a ferrite core and a drive circuit to generate sinusoidal waveforms, allowing for simultaneous tissue cutting and coagulation by varying the voltage waveforms between cutting and coagulation electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional electrosurgical generator delivers RF output waveforms sequentially or through single-phase output, then the device complexity is reduced and ease of manufacture is improved, but the capability to simultaneously perform cutting and coagulation is limited
Solution Approach 1:
The RF output stage is segmented into multiple independent phases (at least three outputs), each capable of delivering RF power with different voltage waveforms. This segmentation allows simultaneous delivery of high-voltage cutting waveforms and low-voltage coagulation waveforms through separate electrode pairs, enabling concurrent cutting and coagulation operations without requiring a single-phase system to switch between modes.
Solution Approach 2:
The multiple-phase RF output stage is designed to provide universal functionality by delivering both cutting and coagulation waveforms simultaneously through the same generator unit. The system can operate in multiple modes (cutting-only, coagulation-only, or blended simultaneous operation) using the same hardware infrastructure, making the device adaptable to various surgical requirements without needing separate specialized equipment.
2Productivity
If sequential cutting and coagulation is performed using conventional generators, then the device complexity is minimized, but the procedural time is increased
Solution Approach 1:
The multiple-phase RF output stage enables continuous simultaneous delivery of cutting and coagulation energy throughout the surgical procedure. Rather than alternating between cutting and coagulation modes, the system maintains both functions active concurrently through separate electrode pairs with phase-displaced waveforms, eliminating idle transition time and maximizing the productive use of surgical time.
Solution Approach 2:
The system performs preliminary coagulation action concurrently with cutting by delivering low-voltage coagulation waveforms through one electrode pair while simultaneously delivering high-voltage cutting waveforms through another electrode pair. This preliminary coagulation prepares the tissue in advance, reducing bleeding before the cutting action completes, thereby streamlining the overall surgical workflow.
3Reliability
If high voltage is applied to all electrodes simultaneously for cutting, then cutting effectiveness is improved, but tissue damage from excessive voltage on coagulation electrodes increases
Solution Approach 1:
The RF output stage delivers locally optimized voltage waveforms to different electrode pairs: high-voltage waveforms are applied specifically to cutting electrodes where incision effectiveness is prioritized, while low-voltage waveforms are applied to coagulation electrodes where tissue sealing is the goal. This localized voltage optimization ensures each electrode performs its specific function at the appropriate voltage level, preventing harmful over-voltage effects on coagulation sites while maintaining effective cutting performance.
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 efficient and simultaneous tissue cutting and coagulation, reducing procedural time and improving surgical efficiency by allowing cutting to commence concurrently with coagulation, while ensuring sufficient tissue coagulation before cutting.
Implementation Method 1
an output transformer delivering phase-displaced RF output voltage waveforms across at least three outputs or instrument electrodes
Implementation Method 2
utilizing a three-phase output transformer with a ferrite core
Implementation Method 3
the magnitude of the RF output voltage waveform delivered to at least one pair of the said generator outputs is sufficient to cause tissue vaporisation
Implementation Method 4
sufficient to cause tissue vaporisation at the respective treatment electrodes
Data Source
AI summary
An electrosurgical system has an electrosurgical generator with a multiple-phase RF output stage coupled to a multiple-electrode electrosurgical instrument. The instrument has three treatment electrodes each of which is coupled to a respective generator output driven from, for instance, a three-phase output transformer. Continuous RF output voltage waveforms are simultaneously delivered to respective generator outputs at the operating frequency, each waveform being phase-displaced with respect to the other waveforms. The magnitude of the RF output voltage waveform delivered to at least one of the generator outputs is sufficient to cause tissue vaporization at the respective treatment electrodes when the system is used for tissue treatment. Also disclosed is an electrosurgical generator in combination with a cutting forceps instrument, such that the coagulation and cutting of the tissue may be performed simultaneously.