Abstract: An electrosurgical generator, which has a high-voltage DC power supply unit and a resonant circuit connected thereto. The resonant circuit has an output transformer, the primary winding of which is part of the resonant circuit and the secondary winding of which is connected to connections for an electrosurgical instrument. The resonant circuit is furthermore connected to an actuation circuit, which is configured to periodically emit actuation pulses for the purpose of exciting the resonant circuit using the resonant frequency thereof. The actuation circuit includes a synchronization unit, which is connected to the resonant circuit, and includes at least one gradient detector and is configured to synchronize actuation pulses with a reversal point of the voltage profile of the voltage in the resonant circuit.

Abstract: 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.

Abstract: An electrosurgical generator, which has a high-voltage DC power supply unit and a resonant circuit connected thereto. The resonant circuit has an output transformer, the primary winding of which is part of the resonant circuit and the secondary winding of which is connected to connections for an electrosurgical instrument. The resonant circuit is furthermore connected to an actuation circuit, which is configured to periodically emit actuation pulses for the purpose of exciting the resonant circuit using the resonant frequency thereof. The actuation circuit includes a synchronization unit, which is connected to the resonant circuit, and includes at least one gradient detector and is configured to synchronize actuation pulses with a reversal point of the voltage profile of the voltage in the resonant circuit.

Abstract: 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.

Abstract: Electrosurgical instrument including a handpiece which has a connection side (A) and a treatment side (B), and including a connecting plug which is electrically connected to the connection side (A) of the handpiece and is electrically connectable to a high-frequency generator, wherein the electrosurgical instrument includes a control unit which is designed to actively control the voltage waveform of high-frequency energy which is output on the treatment side (B) of the handpiece.

Abstract: The invention relates to a high-frequency surgical device for generating high-frequency energy for cutting and/or coagulating biological tissue. The high-frequency surgical device comprises an application part being electrically connectable to an electrosurgical instrument having at least one activation switch, an intermediary power circuit galvanically separated from the application part, a DC power source which, in operation, provides in the application part at least one DC voltage, a with the DC voltage source electrically connected control signal generator which, in operation, generates in the application part (10) from the DC voltage an alternating control signal with a predetermined switching frequency, and a to the control signal generator electrically connected evaluation unit being electrically connectable to the activation switch of the instrument and which, when the activation switch is actuated, transmits a with the switching frequency oscillating activation signal to the input power circuit.

Abstract: The invention relates to a high-frequency surgical device for generating high-frequency energy for cutting and/or coagulating biological tissue. The high-frequency surgical device comprises an application part being electrically connectable to an electrosurgical instrument having at least one activation switch, an intermediary power circuit galvanically separated from the application part, a DC power source which, in operation, provides in the application part at least one DC voltage, a with the DC voltage source electrically connected control signal generator which, in operation, generates in the application part (10) from the DC voltage an alternating control signal with a predetermined switching frequency, and a to the control signal generator electrically connected evaluation unit being electrically connectable to the activation switch of the instrument and which, when the activation switch is actuated, transmits a with the switching frequency oscillating activation signal to the input power circuit.