A balloon catheter (10) comprises an elongated flexible metallic shaft (12) and at least one inflatable balloon (16) mounted on the distal end area of the shaft (12). The wall (13) of the shaft (12) providing the mechanical properties for flexibility and pushability is entirely made of metal, said wall (13) has a sheet-like shape. The wall (13) has an outer diameter up to 0.5 mm and a wall thickness in a range from 0.02 mm to 0.1 mm. (Fig. 1)
