A trocar system, comprising a trocar having an optical channel extending coaxially in the trocar for receiving an optical unit, and a hollow transparent distal tip of the trocar, which can be observed from the interior. The distal working end of an instrument having two working parts movable relative to one another is formed on the distal tip, wherein a first working part is an integral component of the tip and the second working part is mounted movably on the tip, wherein an actuating channel is constructed in the wall of the trocar surrounding the optical channel, which channel extends axially parallel from the proximal end of the trocar into the distal tip thereof, and wherein an actuating element is received in the actuating channel such as to be axially displaceable.