A surgical instrument stone trap

A surgical stone trap instrument (1) with a gripping element (6) which is disposed at the distal end of a shaft (2) having a tube (4) which is traversed by a pull wire (5), (at the distal end of the gripping element 6) is mounted, which (by axially sliding over the tube 4) is collapsible, in which (at the proximal end of the shaft 2), a handle (3) with two handle pieces (3, 10) is arranged (at the fixed handle 3) proximal end of the puller wire (5) and on the moving handle (10), the proximal end of the hose (4) are fixed, characterized in that the hose (4) in the longitudinal region of the fully enclosed by it gripping element (6) on its outer side, having a visible marking (13).