The present invention relates to a double lumen catheter tube having a substantially circular cross-section and comprising a catheter tube body having a longitudinal axis, and further comprising an outer tubular and an inner divider wall inside the catheter tube body dividing said catheter tube body into a first and a second lumen. The first and the second lumen each comprise a cross section having the shape of an isosceles triangle with three rounded vertices. The tubular wall comprises wall sections that have a smaller wall thickness.
