Abstract: An electrosurgical system includes a supply apparatus and a neutral electrode. A measurement signal is applied or impressed to the neutral electrode and the resulting impedance actual value (Zist) of the neutral electrode current circuit can be determined. The measurement signal (US, IS) is applied at different measurement frequencies (?) and one impedance actual value (Zist) for each measurement frequency (?) is determined. The impedance actual values characterize a frequency-dependent progress of the impedance and can be checked by a predefined frequency-dependent check criterion. It can thereby be recognized whether the conductive connection between the neutral electrode and the patient complies with the specifications defined by the check criterion. Particularly it is checked whether a sufficiently large area portion of the neutral electrode is conductively connected to the patient, so that excessive current densities in the region of the neutral electrode inside the tissue of the patient can be avoided.

Abstract: Supply apparatuses and methods for supplying an electromedical instrument with electrical energy are disclosed. For example, an adjustable and/or selectable operating mode parameter (M) defines an operating mode voltage (UM) that indicates a set point value for an electrode voltage (UE) at an electrode of the electromedical instrument. At a power supply output, an impressed output voltage (UA) is provided in accordance with a set point output voltage (US) as well as a variable output current (IA) for the electromedical instrument. In one as aspect, an operating mode voltage is corrected based on a correction value and/or voltage and forms a corrected operating mode voltage (UMC) based on which the set point output voltage (US) is provided for the power supply. The correction value or voltage are determined depending based on an actual value of the output current (IA) as well as an impedance parameter (ZI) that characterizes the impedance of the instrument.

Abstract: Embodiments disclosed include an electrosurgical system as well as a method. The electrosurgical system and the method (are configured to determine an electrode type (T1, T2, T3) of a neutral electrode by applying an alternating measurement signal to the neutral electrode at least at two different measurement frequencies (f1, f2). At each measurement frequency (f1, f2) an impedance absolute value (ZNabs) or a phase value (?) or both is determined for the neutral electrode impedance (ZN) of neutral electrode. When at least one impedance absolute value (ZNabs) and at least one phase value (?) is determined, and based on the at least one impedance absolute value (ZNabs) and the at least one phase value (?), the electrode type (T1, T2, T3) of the connected neutral electrode is determined by comparison with known comparison values for the at least one impedance absolute value (ZNabs) and the at least one phase value (?).

Abstract: A supply apparatus for an electrosurgical system as well as an electrosurgical system having a supply apparatus. In addition to a generator, the supply apparatus has a measurement signal source that is able to provide a measurement signal (XM) in form of an alternating voltage and/or an alternating current. An impedance parameter (P) resulting from the measurement signal (XM) can be evaluated. A switch device of supply apparatus can be switched between multiple switch conditions (C1-C5). In the different switch conditions (C1-C5) different evaluation functions can be realized by means of the evaluation unit (50). The measurement signal source can apply a measurement signal to a treatment current path (B) at a working connection of supply apparatus as well as to a neutral current path (N) between neutral connections of supply apparatus. In doing so, by means of the measurement signal (XM), treated tissue can be analyzed as well as a contact between neutral electrode and the patient can be checked or monitored.

Abstract: A supply apparatus for an electrosurgical system as well as an electrosurgical system having a supply apparatus. In addition to a generator, the supply apparatus has a measurement signal source that is able to provide a measurement signal (XM) in form of an alternating voltage and/or an alternating current. An impedance parameter (P) resulting from the measurement signal (XM) can be evaluated. A switch device of supply apparatus can be switched between multiple switch conditions (C1-C5). In the different switch conditions (C1-C5) different evaluation functions can be realized by means of the evaluation unit (50). The measurement signal source can apply a measurement signal to a treatment current path (B) at a working connection of supply apparatus as well as to a neutral current path (N) between neutral connections of supply apparatus. In doing so, by means of the measurement signal (XM), treated tissue can be analyzed as well as a contact between neutral electrode and the patient can be checked or monitored.

Abstract: Embodiments disclosed include an electrosurgical system as well as a method. The electrosurgical system and the method (are configured to determine an electrode type (T1, T2, T3) of a neutral electrode by applying an alternating measurement signal to the neutral electrode at least at two different measurement frequencies (f1, f2). At each measurement frequency (f1, f2) an impedance absolute value (ZNabs) or a phase value (?) or both is determined for the neutral electrode impedance (ZN) of neutral electrode. When at least one impedance absolute value (ZNabs) and at least one phase value (?) is determined, and based on the at least one impedance absolute value (ZNabs) and the at least one phase value (?), the electrode type (T1, T2, T3) of the connected neutral electrode is determined by comparison with known comparison values for the at least one impedance absolute value (ZNabs) and the at least one phase value (?).

Abstract: An electrosurgical system includes a supply apparatus and a neutral electrode. A measurement signal is applied or impressed to the neutral electrode and the resulting impedance actual value (Zist) of the neutral electrode current circuit can be determined. The measurement signal (US, IS) is applied at different measurement frequencies (?) and one impedance actual value (Zist) for each measurement frequency (?) is determined. The impedance actual values characterize a frequency-dependent progress of the impedance and can be checked by a predefined frequency-dependent check criterion. It can thereby be recognized whether the conductive connection between the neutral electrode and the patient complies with the specifications defined by the check criterion. Particularly it is checked whether a sufficiently large area portion of the neutral electrode is conductively connected to the patient, so that excessive current densities in the region of the neutral electrode inside the tissue of the patient can be avoided.