Electrosurgical Generator Test Circuit With HF-Powered DC Spark Simulation
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Solution Overview
Problem
Existing testing devices for electrosurgical generators face challenges in synchronizing the generation of DC voltage with HF current emission, particularly in modes with rapid treatment phases, and require complex setups due to external power supplies.
Innovation Solution
A testing device for electrosurgical generators that generates DC voltage using an HF current path, eliminating the need for an external power supply, and incorporates a capacitor to charge during positive half-waves of the HF current, with diodes to separate half-waves and switches to control voltage and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external power supply is used to generate DC voltage for simulating sparks, then the DC voltage can be applied to the patient circuit, but the synchronization with HF current emission becomes difficult and the test setup complexity increases
Solution Approach 1:
The testing device uses the HF current from the electrosurgical generator itself to power the DC voltage generation unit. The HF current flows through a rectifier circuit that converts it to DC voltage, eliminating the need for an external power supply. This self-powered approach ensures automatic synchronization between DC voltage generation and HF current emission, while simplifying the overall test setup.
Solution Approach 2:
A rectifier circuit acts as an intermediary between the HF current path and the DC voltage generation. This intermediary component converts the HF current into DC voltage with automatic synchronization, resolving the contradiction between reliable synchronization and setup complexity.
2Reliability
If DC voltage is generated in series with the HF current path using an external power supply, then sparking simulation is achieved, but the synchronization is difficult in operating modes with rapidly successive treatment phases
Solution Approach 1:
The DC voltage generation unit is powered directly by the HF current from the generator, enabling it to respond instantaneously to changes in treatment phases. This eliminates the synchronization delays associated with external power supplies, allowing accurate spark simulation even during rapidly successive treatment phases.
Solution Approach 2:
The system uses the HF current itself as feedback to control DC voltage generation. The rectifier circuit automatically adjusts DC voltage output based on the instantaneous HF current level, ensuring accurate synchronization with rapid treatment phase transitions.
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
The solution ensures automatic synchronization of DC voltage with HF current, simplifies the test setup, and allows precise simulation of sparking conditions without external power, enhancing the reliability of electrosurgical generator testing.
Implementation Method 1
a capacitor (23) connected in parallel to the DC voltage source (21) and the switch (22) in order to conduct the HF current emitted by the electrosurgical generator (1) through the testing device (30)
Implementation Method 2
The HF current is simultaneously barely influenced if the capacitor is appropriately dimensioned
Implementation Method 3
The unit for generating a DC voltage is designed to conduct positive half-waves of the HF current through the capacitor and to not conduct negative half-waves of the HF current through the capacitor
Implementation Method 4
a switch (22) connected in series to the DC voltage source (21) and the capacitor (23) in order to conduct the HF current emitted by the electrosurgical generator (1) through the testing device (30)
Implementation Method 5
They simulate the generation of sparks by applying a DC voltage in the patient circuit of the electrosurgical generator, which corresponds approximately to the DC voltage resulting from sparking
Data Source
AI summary
A testing device for an electrosurgical generator, including a first connection port and a second connection port for connecting the testing device to a patient circuit of the electrosurgical generator and including an apparatus for producing a direct voltage between the first connection port and the second connection port. The testing device is characterized in that an HF current path of the patient circuit, running from the first connection port to the second connection port, extends through the testing device and in that the apparatus for producing a direct voltage is fed by an HF current flowing through the HF current path.