Surgical instrument (10, 10',10) with a hollow tube shaft (20),which is a longitudinal axis (1),has a proximal end (21) and a distal end (22) and a metal wire (30),which is a first end section (31),at least one shaft section (32) and one work section (33, 33',33) having the first end section (31) in the area of the proximal end (21) of the sheep (20) or at the proximal end (21) of the sheep (20) taken from the sheep (20), with the cut of the sheep (32) in the hollow tube and the wire (30) along the longitudinal axis (1) of the sheep (20) is arranged in such a way that in a first position of the working section (33,33',33) at the distal end (22) protruded from the shaft (20) and in a second position of the work section (33, 33',33) is fully positioned within the shaft (20), where the instrument (10) is formed as a bipolar instrument (10), where the metal wire (30) is part of a first electrode (71) and a second electrode (72) is positioned at least in part at the shaft (20).
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