An electrosurgical instrument (1) includes an end effector (115) having first and second jaw members (150, 160) disposed about a longitudinal axis (z). The first and second jaw members (150, 160) include proximal portions (150a, 160a) defining a gap (G J) therebetween and distal portions (150b, 160b) having first and second tissue contacting surfaces (152, 162), respectively, and shear edges at opposed sides (154, 164) of the first and second tissue contacting surfaces (152, 162). The end effector (115) is configured to selectively communicate electrosurgical energy between the first and second tissue contacting surfaces (152, 162) of the first and second jaw members (150, 160) upon actuation thereof. At least one of the first and second jaw members (150, 160) is movable relative to the other between an open position, a first approximated position in which the first and second tissue contacting surfaces (152, 162) are substantially opposed to each other, and a second approximated position in which the first and second tissue contacting surfaces (152, 162) are laterally offset with respect to each other.Linvention concerne un instrument électrochirurgical (1) qui comprend un effecteur terminal (115) comportant un premier et un second élément mâchoire (150, 160) placés autour dun axe longitudinal (z). Les premier et second éléments mâchoires (150, 160) comprennent des parties proximales (150a, 160a) délimitant un espace (G J) entre celles-ci, et des parties distales (150b, 160b) comportant une première et une seconde surface (152, 162) en contact avec le tissu, respectivement, et des bords de cisaillement sur des côtés opposés (154, 164) des première et seconde surfaces (152, 162) en contact avec le tissu. Leffecteur terminal (115) est conçu pour transmettre sélectivement de lénergie électrochirurgicale entre les première et seconde surfaces (152, 162) des premier et second éléments mâchoires (150, 160) lorsquil est actionné. Le premier et/ou le second élément mâchoir
