Surgical device, in particular for minimally invasive surgery, having a shaft with a distal end equipped with a surgical instrument, for instance a grasper, and a proximal end equipped with an actuation device for the surgical instrument, which actuation device can be coupled with a handgrip and/or mechanical actuation means, and wherein the surgical instrument is mounted on sliders that are longitudinally movable in opposite directions with respect to each other in the said shaft by operation of the actuation device for actuating the surgical instrument, which sliders are provided adjacent to each other within said shaft, and wherein said sliders comprise a first mounted position and a second dismountable position, wherein in the first mounted position the sliders are coupled through a bayonet coupling with the actuation device and are secured while being in this first mounted position, against rotation within the said shaft to prevent releasing of the bayonet coupling between the sliders and the actuation device, and wherein in the second dismountable position the sliders are concurrently slidable at least partly out of said shaft to a point at which rotation of the remainder of the sliders within the said shaft is enabled, and the bayonet coupling between the sliders and the actuation device is releasable.
