Neutrophil granulocytes play an important role in the human immune defence. One of their weapons against bacteria and fungi is the release of Neutrophil Extracellular Traps (NETs) which form in great amounts a biofilm. Electrical Impedance Spectroscopy (EIS) enables the examination of the NET-formation to determine the reaction parameters and to investigate the state of wound inflammation. In this work we analyze the behaviour of neutrophils in vitro and develop an empiric model of the states of NET-formation. This model can be used to develop a wound sensor which monitors the NET-formation caused by an infection in vivo.