Instrument (1) for cutting body tissue, comprising - a handle of the instrument (2) - a blade (3) disposed adjacent a distal end (6) of the handle of the instrument (2), which can be folded relative to a longitudinal axis (7) of the handle (2) and rotatable about the longitudinal axis 5 (7), and - a maneuvering part (5) disposed at the proximal end (10) of the handle of the instrument (2), wherein the distal end (6) of the handle of the instrument can be inserted into a body cavity with tissue to be cut, through a trocar sleeve, wherein the blade (3) with a proximal end (14) facing the actuating part (5), away from the longitudinal axis, can perform a lateral pivotal movement around about one end (46) of the blade which diverges from proximal end (14) and is articulated distally at an articulation point (19), and wherein the distal end (6) of the handle of the instrument (2) a stop for the fabric (4), and the stop for the tissue is disposed can be Worn or an active position, wherein a stop surface (47, 48), facing the blade (3) in the proximal direction, at a distance I fixed (50) predetermined with respect to the articulation point (19), characterized in that, at the distal end (6) of the handle of the instrument (2) is arranged an outer sleeve (8) rotatable about the longitudinal axis (7) which, transversely with respect to its longitudinal direction, has an opening lateral (9) from which the blade (3) can perform a pivoting movement.Instrumento (1) para cortar tejido corporal, el cual comprende - un mango del instrumento (2) - una cuchilla (3) dispuesta de forma contigua al extremo distal (6) del mango del instrumento (2), la cual puede puede plegarse con respecto a un eje longitudinal (7) del mango (2) y puede rotar alrededor del eje longitudinal 5 (7), y - una parte de maniobra (5) dispuesta en el extremo proximal (10) del mango del instrumento (2), donde el extremo distal (6) del mango del instrumento puede ser introducido en una cavidad corporal con tejido qu
