Grasper (1) comprising at least two movable parts (4, 5) embodying a jaw, wherein each of the movable parts (4 resp. 5) is mounted on at least one support (6, 6 resp. 7, 7), wherein a relative position of the movable parts ( 4 5) with respect to each other is variable by changing the relative position of the supports ( 6, 6 7, 7 ) with respect to each other, wherein the supports ( 6, 6 7, 7 ) of the movable parts ( 4, 5) comprise flexural members, wherein the flexural members of the supports (6, 6 7, 7) are provided with stiffening elements and/or thickenings (9) to provide for locally increased stiffness and rigidity of the flexural members in comparison with the remainder of said flexural members.
