Patent ID: 7322964

Claim:
A flap valve for a trocar system, with: a valve housing, which is proximally attachable to a guide tube, an opening axially flush with the guide tube, a flap body including a flap that is pivotal about an axis perpendicular to and eccentric to an axis of the opening, and a slide rod, guided in the valve housing to be manually slidable and via which the flap can be pivoted out of a closed position in which the flap blocks said opening and into an open position in which said opening is unblocked, wherein the slide rod is slidable along a line which is substantially perpendicular to the axis of the opening and does not intersect a pivot axis of the flap, that the flap, relative to it's pivot axis, is a two-armed lever, of which one arm includes a valve part and one arm bears an actuation area, against which an inward end of the slide rod contacts, and that the actuation area is formed in a way, that in any pivot angle of the flap, a center axis of the slide rod forms, with a surface of the actuation area with which the slide rod is in contact, describes an angle of at least 15°.