Electrosurgical Generator DC-Offset Detection for Instrument Protection
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Solution Overview
Problem
Existing electrosurgical generators face challenges in enhancing the lifetime of instruments and ensuring safety during operation, particularly when using a combination of ultrasonic vibration and radiofrequency energy, as direct contact with conductive tools can lead to instrument damage.
Innovation Solution
The control unit in the electrosurgical generator monitors the DC-offset voltage between output contacts to determine if an additional conductive tool is used, deactivating the ultrasonic generator if the voltage falls below a threshold, ensuring safe operation and preventing damage by only activating radiofrequency energy when the tool is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultrasonic vibration and radiofrequency energy are applied simultaneously to enhance coagulating and cutting ability, then surgical performance is improved, but the risk of instrument damage increases when conductive tools are used
Solution Approach 1:
The control unit continuously monitors the DC-offset voltage between output contacts and uses this feedback to determine whether a conductive tool is present. When the DC-offset voltage indicates tool presence (below threshold), the system automatically deactivates the ultrasonic generator while maintaining radiofrequency energy delivery, thus preventing instrument damage while preserving surgical functionality when needed
Solution Approach 2:
The system dynamically adjusts its operational state based on real-time detection of tool presence. The control unit switches between different operational modes: (1) both ultrasonic and RF active when no tool is present, (2) RF only when conductive tool is detected, enabling adaptive protection without compromising surgical versatility
2Ease of operation
If a conductive tool like forceps is used to bridge the gap between electrode and tissue for easier coagulation, then ease of operation is improved, but the risk of ultrasonic damage to the instrument increases
Solution Approach 1:
The control unit monitors DC-offset voltage as feedback to detect when conductive tools are introduced into the circuit. When the voltage drops below the threshold indicating tool presence, the system automatically deactivates ultrasonic vibration, preventing the harmful interaction between ultrasonic energy and conductive tools while allowing the tool to remain in use for its intended coagulation function
Solution Approach 2:
The system uses the change in electrical characteristics (DC-offset voltage) caused by tool insertion as a beneficial detection signal. This voltage change, which would otherwise indicate a potential hazard, is converted into a protective mechanism that automatically prevents instrument damage while preserving the surgical benefit of using conductive tools
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 enhances the safety and longevity of electrosurgical instruments by preventing damage from ultrasonic vibration when a conductive tool is used, allowing for effective coagulation without compromising instrument integrity.
Implementation Method 1
an ultrasonic converter can generate an ultrasonic vibration, preferably of a sonotrode of an electrosurgical instrument
Implementation Method 2
a radiofrequency generator for providing a radiofrequency energy at two output contacts
Implementation Method 3
the control unit is adapted to determine a DC-offset voltage between the two output contacts of the radiofrequency generator
Data Source
AI summary
An electrosurgical generator, a control device, a method for operating the electrosurgical generator and a computer program product. The electrosurgical generator includes an ultrasonic generator for providing an excitation signal by which an ultrasonic converter can generate an ultrasonic vibration, a radiofrequency generator for providing a radiofrequency energy at two output contacts, and a control unit adapted to independently activate the radiofrequency generator and the ultrasonic generator. The control unit is further adapted to determine a DC-offset voltage between the two output contacts of the radiofrequency generator, check if the DC-offset voltage exceeds a DC-offset threshold value, and deactivate the ultrasonic generator if the DC-offset voltage does not exceed the DC-offset threshold.