Completely mechanically-operated laparoscopic surgical instrument, which can be disposed of after a single use or which can be sterilised and reused more than once, essentially comprising two gripping elements (2, 3) which are hinged to one another by means of a pivot shaft (4), a working tool (30) provided with two jaws hinged to one another by a pivot shaft, and an actuation mechanism that can transmit movement from the gripping zone to the working tool (30), wherein said tool can adopt multiple positions and/or orientations when being used with the aid of substantially annular bodies coupled to connecting rods associated to the gripping elements.
