Abstract: A method for monitoring a high resistance condition at an instrument terminal of an electrosurgical generator, which includes current and voltage measuring devices for determining a current and a voltage at the terminal to determine the high resistance condition, and includes a calculation device connected to the measuring devices which is configured to evaluate the determined current and voltage, including: determining a crest factor value from the current and/or voltage, wherein the crest factor value describes a ratio of a peak value to an effective value of the current and/or voltage; comparing the determined crest factor value with a comparison value by means of a comparison device, wherein the comparison value is stored in a data storage device; and signaling a high resistance condition with a signaling device when the determined crest factor reaches or exceeds the predetermined crest factor comparison value. Also, an electrosurgical generator and electrosurgical generator system.

Abstract: An electrosurgical generator for supplying power, including an inverter for high voltage, which is led to an output to the connector of an electrosurgical instrument, a measurement system with at least one measurement monitor for a physical parameter at the output or at the electrosurgical instrument, and an operation controller which controls the inverter on the basis of at least one predefined operating sequence. The measurement monitor for the physical parameter is switchable between a plurality of different configurations which differ in the measurement range. The operation controller interacts with the measurement system so one of the different configurations of the measurement monitor is switched in each case, under control by the operating sequence. By switching the configuration, the suitable measurement range is always set during operation.

Abstract: A method for controlling an electrosurgical instrument, in particular a resectoscope in transurethral resection, for cutting, vaporizing or thermally treating body tissues. The electrosurgical instrument has one or two instrument poles, and the electrosurgical instrument is controlled by an RF signal in order to control an electrical instrument current via one instrument pole or via the two instrument poles when the RF signal is activated. The method is prepared to identify a contact of one or both instrument poles with an electrically conductive solid.

Abstract: Method for verifying a power recording of an RF generator to control at least one electrosurgical instrument, wherein the RF generator has an inverter for generating an RF signal, and the inverter via an Inverter input is supplied with electrical current and via an Inverter output emits an RF signal with a voltage value and a current value for driving an electrosurgical instrument, including the steps recording of an output power delivered via the RF signal by directly measuring the RF signal by means of an RF power acquisition device, as directly recorded out-put power, recording of a comparative power based on a power measured on the input side of the inverter and verifying the functioning of the RF power acquisition device by comparing the recorded comparative power with the directly recorded output power.

Abstract: Electrosurgical generator provides a HF alternating voltage to electrosurgical instruments, including a first/second HF generation unit supplying a first/second HF alternating voltage having a first/second frequency to a first/second output which are configured for connection of a first/second electrosurgical instrument. Upon activation a first current flows to the first electrosurgical instrument and simultaneously a second current flows to the second electrosurgical instrument. That portion of these currents being actually delivered from the electrosurgical instruments to the tissue to be worked on are working currents. They are important for safe operation but cannot be measured directly. An observer unit is configured for indirect determination of said working currents based on measured values of the total currents. The so determined working currents are used as input signals for an inverter controller, achieving improved control of the electrosurgical generator.

Abstract: Electrosurgical generator for providing a dual frequency power output in a low and a high frequency range to an output socket for an electrosurgical instrument, including an inverter unit configured to simultaneously generate said dual frequency power output. The inverter unit is a multilevel inverter including a low frequency driving unit configured for forming a low frequency reference signal, a high frequency driving unit configured for forming a HF reference signal, and a modulation unit configured for forming a modulated combined reference signal by modulating the low frequency reference signal onto the high frequency reference signal. The modulated combined reference signal is supplied to the multilevel inverter for generating the dual frequency power output. Thereby, an efficient way for providing high-frequency energy in the low frequency (ultrasound) band as well as the high frequency (radiofrequency) band by means of a single inverter is formed.

Abstract: Modular generator system comprising at least two generator types which are composed of a plurality of generator components and differ with regard to their equipment and/or functions. The generator components comprise a power supply and an inverter for generating an output energy for an electrosurgical instrument. The generator types are each of modular design with a plurality of modules: (i) at least one uniform base module having a communication unit, and (ii) at least one individual module which may differ depending on generator type. Individual modules can be a module for the power supply, a module for the inverter, a module for the output connection. Different generator types differ with regard to their individual module equipment. By virtue of such a two-tier module concept, namely uniform base module and differing individual modules, a maximum number of variants can be achieved with a minimum number of different modules.

Abstract: An electrosurgical generator for outputting a HF voltage to an electrosurgical instrument includes a power supply unit, an inverter unit generating the HF voltage, a base module and a plurality of function modules for performing various functions of the electrosurgical generator, at least one thereof being configured for controlling a user interface. Each of the function modules features a galvanically separated local operating power supply includes a transformer being fed by the base module having an operating power distribution unit. A central AC generator is provided generating AC voltage supplied to the operating power distribution unit. The transformers are decentralized at each of the function modules. This combination of centralized AC generation and decentralized transformers increases efficiency, reduces space demand and facilitates effective shielding, thereby providing a more economical, compact and EMR improved electrosurgical generator.

Abstract: An electrosurgical generator including an inverter unit generating HF energy and a high-voltage connection supplying the HF energy to an output socket for an electrosurgical instrument. The high-voltage connection includes a base module with a distribution unit and at least one connection port. The distribution unit comprises a HF distribution line and data communication wiring, both being supplied to the at least one connection port for which a sub module is provided connecting to the HF and the data signals and supplying the output socket. Thereby electrical connections and data communications are established at once. Consequently, inserting a different sub module allows for simplified alteration of type and variant of the generator. A newly developed version of the sub module may just be inserted into the connection port without any need of alteration of the base module. Modernization and updating is facilitated.

Abstract: An Electrosurgical generator including an inverter unit generating a high-frequency alternating voltage to be supplied to at least two output sockets for connection of electrosurgical instruments. The inverter unit is a multilevel inverter. It includes a plurality of co-operating inverter cells which are connected in a cascaded manner in a first state and being split into at least two groups (I, II) in a second state. The inverter unit is selectively switchable between said first and second state. Each group is assigned one of the output sockets and feeds its HF voltage thereto. This enables simultaneous controlling of the distinct groups and their HF output. Thereby, unwanted interference patterns can be avoided. Uncontrolled low-frequency beat can be largely suppressed, allowing improved control of thermal energy and cutting power. Quality of the work performed can be increased which is beneficial for the patient.

Abstract: A device for detecting activation of electrosurgical instrument switching steps, including: a power converter for generating an electrical measurement current, wherein the power converter has at least a first and second controllable switching step; a control device for the controllable switching step, at least first and second instrument switching steps, wherein the first and second instrument switching steps being electrically connected to the power converter, and an evaluation device for evaluating the generated measurement current.

Abstract: An electrosurgical system, including: an electrosurgical generator, and an electrosurgical instrument configured to connect to the electrosurgical generator through a three-pin connector; wherein the electrosurgical instrument includes an electrosurgical electrode connected to a first pin of the three-pin connector, and one of an activation switch circuit and an instrument identification circuit connected to a second pin and a third pin of the three-pin connector; wherein the electrosurgical generator is configured to detect, upon connection of the electrosurgical instrument to the electrosurgical generator, whether the electrosurgical instrument includes an activation switch circuit or an instrument identification circuit; and, if the electrosurgical instrument includes an activation switch circuit, connect the second and third pin of the three-pin connector to an activation switch unit, or, if the electrosurgical instrument includes an instrument identification circuit, connect the second and third pin of t

Abstract: An electrosurgical generator including housing and an internal circuitry to generate a high-frequency voltage and to output the generated high-frequency voltage to an electrosurgical instrument, further including at least one output socket for connection of a plug of the electrosurgical instrument. The output socket is configured as self-contained unit including: a casing configured for mounting at a front plate of the housing; a plug socket mounted at a frontal face of the casing for plugging of the electrosurgical instrument; a conductor board inserted into the casing and being configured to provide internal connections of the output socket; and a connector provided at the conductor board for a connection to the internal circuitry. Thereby the output socket is modularly exchangeable. Being self-contained, the output socket can be easily exchanged against another output socket of different functionality, allowing for easy re-configuration.

Abstract: A method for monitoring a high resistance condition at an instrument terminal of an electrosurgical generator, which includes current and voltage measuring devices for determining a current and a voltage at the terminal to determine the high resistance condition, and includes a calculation device connected to the measuring devices which is configured to evaluate the determined current and voltage, including: determining a crest factor value from the current and/or voltage, wherein the crest factor value describes a ratio of a peak value to an effective value of the current and/or voltage; comparing the determined crest factor value with a comparison value by means of a comparison device, wherein the comparison value is stored in a data storage device; and signaling a high resistance condition with a signaling device when the determined crest factor reaches or exceeds the predetermined crest factor comparison value. Also, an electrosurgical generator and electrosurgical generator system.

Abstract: An electrosurgical generator for supplying power, including an inverter for high voltage, which is led to an output to the connector of an electrosurgical instrument, a measurement system with at least one measurement monitor for a physical parameter at the output or at the electrosurgical instrument, and an operation controller which controls the inverter on the basis of at least one predefined operating sequence. The measurement monitor for the physical parameter is switchable between a plurality of different configurations which differ in the measurement range. The operation controller interacts with the measurement system so one of the different configurations of the measurement monitor is switched in each case, under control by the operating sequence. By switching the configuration, the suitable measurement range is always set during operation.

Abstract: An electrosurgical generator which outputs high-frequency AC voltage for an electrosurgical instrument includes a leakage current detecting device for the connected electrosurgical instrument. The leakage current detecting device is embodied as a voltage measuring device, the inputs of which are connected in each case via a capacitive coupling to an active and a neutral line of the output line and which has a bipolar voltage divider having a predetermined fixed ratio. An asymmetry detector connected via a capacitive coupling compares upper and lower voltage at the voltage divider, and outputs a fault signal for leakage current in the case of deviation of the ratio of upper to lower voltage from the predetermined fixed ratio.

Abstract: An electrosurgical generator for an electrosurgical instrument includes a DC voltage supply and a high-voltage inverter that generates a high-frequency AC voltage having a variable voltage and frequency that is output at an output for the connection of the electrosurgical instrument. The inverter is configured as a multilevel inverter and includes a plurality of inverter cells connected in a cascaded manner that are driven by a control device. Thanks to the cascading, switching losses incurred in the power semiconductors are reduced, both in terms of value (through the divided and thus lower voltage) and in terms of frequency (through the reduced switching frequency).

Abstract: An electrosurgical generator for an electrosurgical instrument includes DC voltage supply and high-voltage inverter that generates high-frequency AC voltage having variable voltage and frequency. Inverter is multilevel inverter controlled by reference signal and having at least two groups of series-connected inverter cells, wherein each group is supplied with different DC voltage and wherein the voltages output by the two groups are summed to be output at output. Group supplied with higher voltage enables fast and large voltage changes with its inverter cells, while inverter cells of other group supplied with lower voltage allow fine setting with high change speed. Dynamic range is improved both from temporal viewpoint and in terms of increased voltage span. The number of HVC cells to be switched may furthermore be varied by way of modulator, wherein further number of LVC cells are switched in an opposing manner for compensation purposes. Switching losses may be reduced.

Abstract: An electrosurgical generator having connectors for an electrosurgical instrument including a high-voltage generator electrically connected to the connectors and produces a high-frequency alternating current in its activated state and output said high-frequency alternating current via the connectors. The electrosurgical generator has an effective power determination unit including a phase shift determination unit that supplies an output signal representing a phase shift between the current and the voltage of an alternating current output during operation. The phase shift determination unit produces a pulsed DC voltage signal, in which the pulse width reflects a time difference between the zero crossings of the current and the voltage—and consequently the phase shift—and to process the pulsed DC voltage signal by way of a low-pass filter to form a low-pass filter output signal, the magnitude of which depends on the pulse width of the pulses of the pulsed DC voltage signal.

Abstract: A medical device includes a medical function unit, an electronic control unit, and a voltage supply for the medical function unit and/or the electronic control unit, wherein the voltage supply is configured to be connected to a wired external supply voltage network, and wherein the electronic control unit includes a data interface in order to exchange data with an external device. The medical device wherein the data interface is configured to transmit and/or to receive data via at least one conductor of the supply voltage network. Furthermore, a medical device system is included.