Electrosurgical Generator Cable Detection via Current Measurement
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Solution Overview
Problem
Electrosurgical generators lack an effective method to automatically detect the insertion or removal of cables, leading to manual operation by medical professionals, which diverts their attention from the patient and can result in unintended electrical effects due to parasitic capacitance.
Innovation Solution
The system measures current and voltage at the output port of the electrosurgical generator, using internal cable compensation parameters to estimate the current and determine cable coupling or uncoupling based on a current threshold, allowing for automatic detection of cable insertion or removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual cable detection is used by medical professionals, then operational control is maintained, but operator attention is diverted from the patient and unintended electrical effects occur
Solution Approach 1:
The electrosurgical generator automatically detects cable insertion and removal by measuring current at its output port, eliminating the need for manual detection by medical professionals. The system serves itself by autonomously monitoring its own operational state through current measurements, thereby maintaining reliability while freeing operator attention for patient care
Solution Approach 2:
The system continuously measures current at the output port and uses this feedback to determine cable status. When current exceeds a threshold, the system identifies cable insertion; when current drops below the threshold, it identifies removal. This closed-loop feedback mechanism enables automatic, reliable detection without requiring operator intervention
2Extent of automation
If cable detection switch is used, then automatic cable detection is enabled, but the switch may be unavailable or inoperable
Solution Approach 1:
Instead of relying on a dedicated cable detection switch that may fail, the system uses current measurement as an intermediary to infer cable status. The current measurement serves as a reliable mediator that indirectly detects cable insertion and removal, providing automatic detection capability that is not subject to switch availability or operability issues
Solution Approach 2:
The patent replaces the mechanical cable detection switch with an electrical measurement-based detection method. By measuring current at the output port and comparing it to thresholds, the system substitutes a potentially failing mechanical component with a more reliable electrical sensing approach, thereby maintaining automatic detection while improving system availability
3Extent of automation
If current measurement is used for cable detection, then automatic detection is achieved, but parasitic capacitance causes unintended electrical effects
Solution Approach 1:
The system applies a small interrogation voltage signal (less than 1 volt RMS) that is sufficient to detect cable status through current measurement but insufficient to cause harmful electrical effects or muscle stimulation. This partial action approach enables automatic detection while staying below the threshold for unintended biological effects
Solution Approach 2:
The system changes the parameter of interrogation signal amplitude to be very low (less than 1 volt RMS), which allows current measurement for cable detection while preventing the signal from causing unintended electrical effects on tissue. By adjusting this critical parameter, the system achieves automatic detection without generating harmful factors
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 solution enables the electrosurgical generator to automatically control the supply of energy, reducing the risk of unintended electrical effects and minimizing operator distraction by accurately detecting cable status, thus ensuring consistent and safe treatment.
Implementation Method 1
the internal cabling includes a resistance, an inductance, a capacitance, and a leakage capacitance
Implementation Method 2
the internal cabling includes a resistance, an inductance, a capacitance, and a leakage capacitance
Implementation Method 3
the one or more parameters include one or more of an impedance corresponding to the resistance, the inductance, and the capacitance, or an impedance corresponding to the leakage capacitance
Data Source
AI summary
The disclosed systems and methods relate to detecting coupling or uncoupling of an external cable from an output port of an electrosurgical generator when a cable detection switch is unavailable or inoperable. The electrosurgical generator includes internal cabling having a first end portion connected to the output port and a second end portion. The disclosed technology includes supplying power from the electrosurgical generator, measuring current and voltage at the second end portion of the internal cabling within the electrosurgical generator, accessing one or more parameters associated with internal cable compensation corresponding to the internal cabling within the electrosurgical generator, and determining coupling or uncoupling of an external cable from the output port based on the measured current, the measured voltage, and the one or more parameters associated with internal cable compensation.