Electrosurgical System RF Interference Mitigation via Dynamic Frequency Selection
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Solution Overview
Problem
Conventional electrosurgical systems face interference issues when operating simultaneously due to shared RF frequencies, which can distort feedback signals and impair the reliability of electrosurgical procedures, particularly in multi-site treatments.
Innovation Solution
Implementing a method that uses a band pass filter to select a frequency with minimal RF interference from a group of candidate frequencies, allowing the electrosurgical system to operate without interfering with other systems by refraining from outputting RF energy, measuring interference, selecting a quiet frequency, and generating RF energy at that frequency, thereby ensuring an interference-free feedback signal for controlling the system's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrosurgical systems use the same or similar RF frequencies for operation, then the systems can operate simultaneously, but RF interference occurs between the systems causing feedback signal distortion
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the RF frequency parameter of each electrosurgical system. Each system is assigned a unique frequency from a set of candidate frequencies, and the system controller continuously monitors interference levels and adjusts frequencies accordingly. This transforms the static frequency assignment into a dynamic parameter optimization process that resolves the contradiction between simultaneous operation and signal reliability.
Solution Approach 2:
The patent implements feedback mechanisms where each electrosurgical system monitors the RF interference level in its operating environment. The system controller receives feedback about interference conditions and automatically adjusts the operating frequency to maintain reliable feedback signals. This closed-loop feedback system enables simultaneous operation while preventing interference-induced reliability issues.
2Device complexity
If electrosurgical systems operate at identical frequencies, then the systems are simpler to control, but interference between systems becomes severe
Solution Approach 1:
The patent applies dynamics by transitioning from static identical frequency operation to dynamic frequency assignment. Each system is assigned a unique frequency from multiple candidate frequencies, and the system can dynamically adjust frequencies based on real-time interference conditions. This dynamic approach maintains simplicity in individual system control while eliminating harmful interference through frequency differentiation.
3Productivity
If multiple electrosurgical systems operate simultaneously at the same frequency, then treatment efficiency increases, but feedback signal interference occurs
Solution Approach 1:
The patent applies segmentation by dividing the single RF frequency into multiple distinct frequency channels. Each electrosurgical system is assigned a separate frequency from a set of candidate frequencies, effectively segmenting the shared frequency resource. This segmentation allows multiple systems to operate simultaneously without their feedback signals interfering with each other, thus maintaining both treatment efficiency and signal integrity.
Solution Approach 2:
The patent applies dimensionality change by moving from a single-frequency operation to multi-frequency operation. Instead of all systems operating at one frequency, the system introduces frequency as an additional dimension for differentiation. Each system operates at its own unique frequency, transforming the one-dimensional frequency space into a multi-dimensional operating space that accommodates multiple simultaneous treatments without interference.
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 enables simultaneous and independent operation of multiple electrosurgical systems by reducing RF interference, ensuring reliable feedback signals and maintaining the efficacy of electrosurgical treatments across various modes and sites.
Implementation Method 1
measuring an RF interference for each frequency in a group of candidate frequencies... filtering the feedback signal by a band pass filter whose center frequency is set to the selected frequency
Implementation Method 2
generating (and optionally outputting) RF energy at the selected frequency
Implementation Method 3
controlling operation of the electrosurgical system by using a feedback signal that is derived from, or represents, or sampled from the generated or output RF energy
Data Source
AI summary
Methods and system are provided to mitigate RF interferences during operation of an electrosurgical system. An electrosurgical system configured to output therapeutic RF energy may refrain from outputting RF energy in order to measure an RF interference for a group of candidate frequencies, and to select a frequency from the group of candidate frequencies for which the measured RF interference is below a threshold value, and to produce a feedback signal (a control signal) at the selected frequency to control operation of the electrosurgical system. During operation of the electrosurgical system the feedback signal may be filtered by a BPF whose fundamental frequency is set to the selected frequency, to thus obtain an interference free feedback signal and, consequently, a reliable control of the electrosurgical system.