Device for surgical treatment of animal or human patients, having an apparatus for supply of at least one instrument, wherein the apparatus comprises a generator creating a voltage (u) for supply of the instrument with electric current (i) and a control device that is configured to control the generator according to selectable modes (26, 27, 28) that are stored in the control device and are provided for selection, wherein mode data are assigned to each selectable mode (26, 27, 28) that define a number of physical parameters of the current (i) and/or the voltage (u) and wherein the control device is configured to control the generator according to the mode data of a selectable mode (26, 27, 28), having a selection device that is configured for manual selection of a mode (26, 27, 28) and that is in addition configured for at least some of the selectable modes (26, 27, 28) for adjustment of a desired effect strength, having a memory arranged outside of the apparatus in which individual mode data can be stored that are assigned to individual modes (26', 27') that are individually assigned to selected treating persons, having an authentication device by means of which treating persons can be individually identified and that can be configured to allow the transmission of individual mode data of the authenticated treating person on the apparatus and/or the access to individual mode data stored in a memory of the apparatus for control of the generator or to create such individual mode data and that is further configured to block or delete individual mode data, if the authentication terminates, characterized in that a mode generator is provided for generation of selectable modes (26', 27') that detects user inputs of an authenticated treating person with regard to physical parameters of the voltage (u) and/or the current (i) and is configured to generate assigned individual mode data, and in that the individual mode data refer to such physical parameters of the current (i) or the voltage (u) that are beyond the available adjustment possibilities in the context of selection of the mode and effect strengths. having an apparatus for supply of at least one instrument, wherein the apparatus comprises a generator creating a voltage (u) for supply of the instrument with electric current (i) and a control device that is configured to control the generator according to selectable modes (26, 27, 28) that are stored in the control device and are provided for selection, wherein mode data are assigned to each selectable mode (26, 27, 28) that define a number of physical parameters of the current (i) and/or the voltage (u) and wherein the control device is configured to control the generator according to the mode data of a selectable mode (26, 27, 28), having a selection device that is configured for manual selection of a mode (26, 27, 28) and that is in addition configured for at least some of the selectable modes (26, 27, 28) for adjustment of a desired effect strength, having a memory arranged outside of the apparatus in which individual mode data can be stored that are assigned to individual modes (26', 27') that are individually assigned to selected treating persons, having an authentication device by means of which treating persons can be individually identified and that can be configured to allow the transmission of individual mode data of the authenticated treating person on the apparatus and/or the access to individual mode data stored in a memory of the apparatus for control of the generator or to create such individual mode data and that is further configured to block or delete individual mode data, if the authentication terminates, characterized in that a mode generator is provided for generation of selectable modes (26', 27') that detects user inputs of an authenticated treating person with regard to physical parameters of the voltage (u) and/or the current (i) and is configured to generate assigned individual mode data, and in that the individual mode data refer to such physical parameters of the current (i) or the voltage (u) that are beyond the available adjustment possibilities in the context of selection of the mode and effect strengths.