Patent ID: 7850688

Claim:
An electrosurgical instrument including two limbs articulated in the manner of connection which can be actuated corresponding to a cutting or a clamping tool, electrode parts positioned opposite each other at distal ends of the limbs for gripping tissue and adapted to pass a coagulation current through said tissue for its coagulation, current supply devices adapted to supply said coagulation current to said electrode parts from a HF generator wherein opposing coagulation surfaces respectively defined by said electrode parts, one of said coagulation surfaces being convex at least in a first central section and said opposing coagulation surface being concave at least in a second central section, and the radius of curvature of the concave coagulation surface being greater in at least the second central section than the radius of curvature of the convex coagulation surface in the first central section, said curvatures running along longitudinal axes of said distal ends of the limbs such that tissue gripped between said distal ends extends perpendicularly to said longitudinal axes and is retained by a pressure that increases in directions towards said first and said second central sections, wherein the electrode parts form tensioning areas, so that the tissue is stretched in a direction of pull Z towards the ends of the electrode parts and wherein at least one electrode part defines at least one open region into which a cutting instrument is insertable for carrying out a cutting procedure on said gripped tissue, at least one section of said open region being adapted as a guide for said cutting instrument, wherein each electrode part defines at least one open region that divides the respective electrode part into at least two areas, whereby said electrode parts define respective separation surfaces arranged opposite and parallel to each other.