A catheter (4) comprising a connector (8) with a guide wire channel (12) and an inflation channel (16) a shaft (20) extending from a proximal end (24) to a distal end (28) and having a guide wire lumen (32) and an inflation lumen (36) the shaft (20) being connected at its proximal end (24) to the connector (8) so that said guidewire lumen (32) and inflation lumen (36) are mechanically and fluidically connected with said guide wire channel (12) and inflation channel (16) respectively. The connection is realised in correspondence of a kink portion (44). The catheter (4) comprises a protective sheath (52) placed around an external wall (56) of the shaft (20) and extending from a first sheath end (60) axially placed at a first distance (L1) from the proximal end (24) of the shaft (20) so as to allow a direct contact and a fixing between the external wall (56) of the shaft (20) and the internal wall (64) of the kink portion (44) to a second sheath end (68) axially extending at least in correspondence of a second kink end (42) of the kink portion (44) so as to avoid a direct contact and a fixing between the external wall (56) of the shaft (20) and the internal wall (64) of the kink portion (44).
