Programmable RF Generator for Electrosurgery
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Solution Overview
Problem
Conventional RF power generating circuitry for electrosurgical instruments is inflexible, requiring bulky components and limited to generating a few waveforms at specific frequencies, leading to unpredictable power delivery due to changing tissue composition and load resistance, resulting in undesirable heat transfers and surgical outcomes.
Innovation Solution
A programmable RF generator with a microprocessor-controlled waveform generation module that produces customizable waveforms with adjustable frequencies and modulation, incorporating sensing devices for real-time power feedback to maintain constant power delivery, and an RFID system for setting specific surgical parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RF power generating circuitry is used, then the device structure is simple, but the waveform generation is limited to specific frequencies and the power delivery is unpredictable
Solution Approach 1:
The patent implements a microprocessor-controlled waveform generation module that dynamically adjusts waveform parameters (frequency, amplitude, modulation depth) in real-time based on tissue impedance feedback and surgical requirements, transitioning from fixed-frequency conventional circuitry to adaptive, programmable waveform generation
Solution Approach 2:
The system changes multiple parameters simultaneously including RF frequency (200 kHz to 4 MHz), pulse duration (10 microseconds to 1 second), duty cycle (10% to 90%), and power level (5 to 100 watts) through programmable control, enabling versatile waveform generation across different surgical applications without requiring separate dedicated circuits for each mode
2Reliability
If conventional RF circuitry is used, then the device complexity is low, but the power delivery becomes unpredictable due to changing tissue composition and load resistance
Solution Approach 1:
The patent incorporates real-time tissue impedance sensing devices that continuously monitor load conditions and feed this information back to the microprocessor controller, which automatically adjusts waveform parameters to maintain constant power delivery despite variations in tissue composition, hydration, and contact quality
Solution Approach 2:
The system performs self-adjustment by automatically modifying its own output parameters based on sensed tissue conditions, eliminating the need for manual intervention or complex external control systems while maintaining reliable and predictable power delivery across varying surgical conditions
3Adaptability or versatility
If conventional RF generators are used, then the device is compact, but it requires bulky components to generate waveforms and is limited to a few specific frequencies
Solution Approach 1:
The patent employs a universal programmable waveform generation module that can produce multiple waveform types (sine, square, triangle, pulse) across a wide frequency range (200 kHz to 4 MHz) using a single integrated circuit design, replacing the need for multiple dedicated oscillators and frequency-specific circuits found in conventional generators
Data Source
AI summary
A device is provided for generating RF power for an electrosurgical instrument, wherein the circuit provides the electrosurgical current according to a specified set of predefined parameters. The invention further includes at least one read and write RFID that reads information from a RFID tag. The circuit changes the parameters based on the information.