A surgical instrument comprising: a handle portion an elongated portion defining a longitudinal axis and extending distally from the handle portion an end effector (230) disposed adjacent the elongated portion, the end effector including a first jaw member (250) and a second jaw member (350), the first and second jaw members configured to clamp tissue therebetween a pin (254) disposed in mechanical cooperation with the first jaw member and including an engagement section (280), the plug being movable between a first position wherein the engagement section is spaced from the second jaw member and a second position where the engagement section of the pin engages the second jaw member and a locking structure (290) disposed in the second jaw member, the locking structure being configured to secure the pin to the second jaw member to maintain a position of the second jaw member relative to the first jaw member during the actuating the end effector, wherein the plug includes a projection (276) extending radially therefrom and wherein the first jaw member includes at least one groove (282) adapted to slidably receive the protrusion, the groove which it includes a straight portion (284) and a curved portion (286) located at a distal end (288) thereof to the pin to rotate from a first orientation to a second orientation, when the pin is moved distally from the first position to the second position so that the pin is secured to the second jaw member.Un instrumento quirúrgico, que comprende: una parte de empuñadura una parte alargada que define un eje longitudinal y que se extiende distalmente desde la parte de empuñadura un efector final (230) dispuesto adyacente a la parte alargada, el efector final que incluye un primer miembro de mordaza (250) y un segundo miembro de mordaza (350), el primer y segundo miembros de mordaza configurados para sujetar tejido entre los mismos una clavija (254) dispuesta en cooperación mecánica con el primer miembro de mordaza y que incluye una
