Cannula for percutaneous minimally invasive cannulation of the vena cava

A plastic tube (1) having three longitudinal chambers, including a main chamber (1a), a first lateral chamber (1a1) and a second lateral chamber (1a2), and at least one reinforced section ensuring constant internal diameter, is equipped from the distal side with a round end (2) narrowing towards the end, in which there are longitudinal holes (4) of a size enabling free venous blood flow, and a balloon (6). Below the balloon a fragment of the reinforced tube section (1) is bent under an angle α of approximately 90°. From the proximal side, the tube (1) ends with a flexible cone (3), sealing the cannula tightly, inside which there is a valve (12) closing the main chamber (1a) and a port (5) for inflating the balloon (6) connected to the first lateral chamber (1a1), in addition, inside the second lateral chamber (1a2) there is a removable stiffener (8), whose distal end in the most extreme position reaches the base of the balloon (6), while the proximal end of the stiffener (8) passing through the cone (3) is led out. In the reinforced part the cannula tube (1) retains shape memory.