Surgical instrument

Surgical instrument comprising handles (2, 3) articulated about a pivotal axis (4) for moving jaws, from an open position to a closed position, comprising connection means (5) which permit on the one hand, under a first pressure on the handles (2, 3) locking the handles in a predetermined and constant position, and on the other hand, under the influence of a second pressure on said handles (2, 3) unlocking the handles wherein an open recess (12) is provided to pass through from side to side of a thickness of the second handle (3) such that a hooking region of a catch (13), which is constituted by at least one tooth (14), is directed in a direction of a hook (9) secured to the first handle (2), and wherein the connection means (5) are constituted on the first handle (2) by an ear (6) permitting securement of the hook (9), and on the second handle (3), by the open recess (12) in which is secured the catch (13).