Tissue sealing instrument

A tissue sealing instrument, the tissue sealing instrument comprising:

• a first jaw and a second jaw that are pivotably supported by means of a bearing device toward and away from each other and that comprise sealing electrodes, respectively,
• wherein the first jaw comprises a groove between the sealing electrodes that is limited by means of two opposite flanks, a distance from each other defines a first width (BN), wherein inside the groove a cutting electrode is held in an insulating body, and
• wherein the second jaw comprises a recess between the electrodes, wherein the recess is limited by means of two opposite lateral surfaces and in which a flexible counter support for the cutting electrode is arranged, wherein a distance of the lateral surfaces from each other defines a second width (BA),
• wherein the first width (BN) is smaller than the second width (BA).