Device for supporting a treatment with pulsed electric fields for wound healing and/or for inactivating microorganisms, comprising - an electrical energy storage, - a pulse generator for providing electrical excitation pulses, - a transformer for providing high-frequency electrical pulses at an output side, wherein a first terminal of an input side of the transformer is connected to the pulse generator, and - a treatment instrument comprising a body made of an electrically insulating material and an electrode arranged inside the body, wherein a gas or gas mixture is accommodated inside the body and the treatment instrument is configured for gas discharge upon electrical excitation, wherein a first end of the treatment instrument is configured for coupling to a first terminal of the output side of the transformer, wherein a second end of the treatment instrument is configured to contact surfaces and/or biological tissue, and that a second terminal of the output side of the transformer is connected to a second terminal of an input side of the transformer, wherein the transformer and the pulse generator are configured in such a way that the high-frequency electrical pulses have a pulse repetition rate in the range from 100 Hz to 400 Hz, wherein the treatment instrument is configured to conduct the generated high-frequency electric pulses or their electric fields to an object to be treated or to an organic or biological material to be treated, characterized in that said body is a closed body, wherein the device comprises a housing and a housing shield to which said second terminal of the output side of the transformer is connected, wherein the housing shield is electrically insulated from the outside world by a housing of the device and thus is configured as a floating ground, wherein the pulse generator is configured in such a way that the high-frequency electrical pulses have a frequency in the range from 10 kHz to 100 kHz. - an electrical energy storage, - a pulse generator for providing electrical excitation pulses, - a transformer for providing high-frequency electrical pulses at an output side, wherein a first terminal of an input side of the transformer is connected to the pulse generator, and - a treatment instrument comprising a body made of an electrically insulating material and an electrode arranged inside the body, wherein a gas or gas mixture is accommodated inside the body and the treatment instrument is configured for gas discharge upon electrical excitation, wherein a first end of the treatment instrument is configured for coupling to a first terminal of the output side of the transformer, wherein a second end of the treatment instrument is configured to contact surfaces and/or biological tissue, and that a second terminal of the output side of the transformer is connected to a second terminal of an input side of the transformer, wherein the transformer and the pulse generator are configured in such a way that the high-frequency electrical pulses have a pulse repetition rate in the range from 100 Hz to 400 Hz, wherein the treatment instrument is configured to conduct the generated high-frequency electric pulses or their electric fields to an object to be treated or to an organic or biological material to be treated, characterized in that said body is a closed body, wherein the device comprises a housing and a housing shield to which said second terminal of the output side of the transformer is connected, wherein the housing shield is electrically insulated from the outside world by a housing of the device and thus is configured as a floating ground, wherein the pulse generator is configured in such a way that the high-frequency electrical pulses have a frequency in the range from 10 kHz to 100 kHz.