Electrosurgical Generator Impedance Control
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Solution Overview
Problem
Conventional electrosurgical generators fail to accurately distribute power among multiple instruments simultaneously activated, leading to power surges during deactivation, as they cannot calculate power output at each channel and adjust accordingly.
Innovation Solution
An electrosurgical generator with a non-resonant power converter and sensors to measure voltage and current, which calculates and adjusts impedance in real-time, ensuring that each instrument receives a consistent power setting by determining the total parallel impedance and adjusting power delivery based on individual impedance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple electrosurgical instruments are simultaneously activated using a single output rail, then multiple surgeons can operate using a single generator, but each instrument receives only a portion of the power setting and power distribution becomes inaccurate
Solution Approach 1:
The patent divides the single output rail into multiple independent channels, each with its own impedance measurement and power calculation circuitry. This allows the generator to independently calculate and control power delivery to each instrument channel, resolving the power distribution inaccuracy while maintaining the ability to operate multiple instruments simultaneously.
Solution Approach 2:
The system implements real-time impedance measurement feedback for each channel, continuously monitoring the impedance of connected instruments and adjusting power delivery accordingly. This feedback mechanism enables accurate power calculation and distribution to multiple instruments, preventing both under-powering and over-powering conditions.
2Productivity
If one instrument is deactivated while another remains active, then the generator can switch to single-instrument mode, but a power surge occurs as full power is supplied to the remaining instrument
Solution Approach 1:
The system performs preliminary impedance measurement and power calculation when the first instrument is activated, establishing a baseline power level. When a second instrument is added or the first is deactivated, the system uses this pre-established impedance data to smoothly adjust power distribution, preventing sudden power surges to the remaining active instrument.
Solution Approach 2:
The patent implements dynamic power adjustment that continuously adapts to the number of active instruments. The power converter dynamically modifies output based on real-time detection of active channels, ensuring smooth transitions during instrument activation and deactivation without causing harmful power surges.
3Adaptability or versatility
If the generator splits output from a single rail to multiple instruments, then multiple surgeons can use one generator, but instruments with different tissue impedances receive inconsistent power levels
Solution Approach 1:
The system applies local quality control by implementing independent impedance measurement and power calculation for each instrument channel. Each channel receives customized power delivery based on its specific tissue impedance characteristics, ensuring that instruments with different impedances all receive their appropriate power levels while maintaining overall system versatility.
Data Source
AI summary
An electrosurgical generator includes: a power supply configured to output a DC waveform; a power converter coupled to the power supply and configured to generate a radio frequency waveform based on the DC waveform; an active terminal coupled to the power converter and configured to couple to a first electrosurgical instrument and a second electrosurgical instrument; at least one sensor coupled to the power converter and configured to sense at least one property of the radio frequency waveform; and a controller coupled to the power converter. The controller is configured to: determine a first impedance associated with a first electrosurgical instrument and a second impedance associated with a second electrosurgical instrument based on the at least one property of the radio frequency waveform; and adjust at least one parameter of the radio frequency waveform based on the first impedance and the second impedance.