Abstract: A minimally invasive surgical system includes a surgical instrument having an elongate body portion and an oversleeve, through which the elongate body portion of the surgical instrument is extendable. A valve assembly is associated with one of the oversleeve or the surgical instrument. Mating structure is associated with two or more of the oversleeve, the surgical instrument and the valve assembly, the mating structure is operable to limit or prevent relative movement between the oversleeve and the surgical instrument.

Abstract: For producing a skin opening for minimally invasive surgery an instrument is employed, comprising a grip (10) and a puncture awl (16). The puncture awl (16) is provided on the distal end of a grip (10), which distal end forms a stop surface (12), which limits the penetration depth of the puncture awl (16).

Abstract: The invention provides scissors, having two scissors parts (12, 14), mounted to counter-rotate about a rotational axis (16), which transform into a grip element (12a, 14a) through a closure contact bevel (12d, 14d) and a counter surface (12c, 14c) and have, at the other free axial end thereof, a working end (18), provided with scissors elements (12b, 14b), whereby the working end (18) is angled at an angle (a) in the plane of the scissors (10) from the axis of the scissors parts (12, 14). The distance (L1) from the rotational axis (16) to the closure contact bevel (12d, 14d) of at least one of the scissors parts (12, 14) is greater than the distance (13) from the rotational axis (16) to the distal end of the scissors elements (12b, 14b).

Abstract: A tubular shaft instrument, in particular for the minimally invasive surgery, includes a shaft tube (10), an actuating element (12) axially displaceable in the shaft tube (10) and a grip provided at the proximal end of the tubular shaft instrument in the instrument axis. The grip includes two grip shanks (18), which are connected to each other at the proximal end, of which the free distal ends are spread apart by a spring force transverse to the instrument axis and can be pressed together against this spring force. At least one of the grip shanks (18) is connected with the actuating element (12) via a hinged or linked lever (20). On the opposite outer sides of the grip shank (18) finger rings (28) are provided on their distal end areas, which finger rings project outwards from the grip shanks (18).

Abstract: For producing a skin opening for minimally invasive surgery an instrument is employed, comprising a grip (10) and a puncture awl (16). The puncture awl (16) is provided on the distal end of a grip (10), which distal end forms a stop surface (12), which limits the penetration depth of the puncture awl (16).