A cannula for minimally invasive surgical tricuspid valve repair, which is constituted by a tube, equipped, at its distal end, with a head consisting of a cone-shaped rigid ring and connected to it on the other side of a flexible ring. The flexible ring in the folded state has a disk shape, and on top of the head there is an axial hole leading to the interior of the cannula. On the whole length of the head and on a part of the tube near the connection to the head, from the inside, there is a thin guide sleeve which, on the section of the rigid ring is permanently attached to the surface of its wall, while on its remaining length, it is slidably movable relative to the wall of the tube. The guide sleeve is equipped with at least two tie rods attached, on one end, opposite to each other, to the wall of the guide sleeve, and their free ends extend along walls of the cannula beyond its distal end.
