Fluid system with a safety device

Fluid system for medical or therapeutic applications, comprising a) an inlet (3), b) an outlet (13) and c) at least one fluid line (6, 6 ', 6 "; 18, 19), which (from the inlet 3) to the outlet (13) leads, d) wherein the fluid system further comprises an electrically activatable melting device which melts a flow of fluid through the at least one of the fluid lines (6, 6 ', 6 "; interrupts 18, 19), cancels or redirects e) wherein the molten material of the melting device, the at least one fluid line (6, 6 ', 6 "; 18, 19) is clogged or the melting of the melting means an opening in one of the fluid lines (6, 6', 6"; 18, 19) generated, characterized in that, as a discharge line for the fluid from the at least one of the fluid lines (18, 19 6, 6 ', 6 ") f) the melting device comprises a fusible material, the at least one fluid line (6, 6 ', 6 "; 18, 19 forms).