A telescopic rod system, comprising: - at least one first tubular rod and one second tubular rod, each having an outer surface (2a, 3a) and an inner surface (2b, 3b), said first rod and second rod having a mainly straight longitudinal direction of extension, the inner surface of the first rod and the outer surface of the second rod having respective first elliptically extending sections or sections that can be inscribed in an ellipse (E2, E3), transverse to said longitudinal direction of extension, the length of the semimajor axis (LMAX2b) of the first elliptical section of the inner surface of the first rod being greater than the length of the semimajor axis (LMAX3a) of the first elliptical section of the outer surface of the second rod, and the length of the semiminor axis (LMIN2b) of the first elliptical section of the inner surface of the first rod being smaller than the length of the semimajor axis (LMAX3a) of the first elliptical section of the outer surface of the second rod, - second respective elliptical sections of the inner surface of the first rod and the outer section of the second rod; the length of the semimajor axis of the second elliptical section of the inner surface of the first rod being greater than the length of the semimajor axis (SMAX3a) of the second elliptical section of the outer surface of the second rod, and the length of the semiminor axis (SMIN2b) of the second elliptical section of the inner surface of the first rod being smaller than the length of the semimajor axis (SMAX3a) of the second elliptical section of the outer surface of the second rod; said first and second elliptical sections alternating with each other along the longitudinal extent of their respective rods, - the lengths of the semimajor axes (SMAX3a) of the second elliptical sections being smaller than the lengths of the semimajor axes (LMAX3a) of the first elliptical sections of the outer surface of the second rod, and the lengths of the semiminor axes (SMIN2b) of the second elliptical sections are smaller than the lengths of the semiminor axes ()LMIN2b) of the first elliptical sections of the inner surface of the first rod, characterized in that the first and second elliptical sections extend on parallel planes, inclined to the longitudinal direction of extension of the respective rods. - at least one first tubular rod and one second tubular rod, each having an outer surface (2a, 3a) and an inner surface (2b, 3b), said first rod and second rod having a mainly straight longitudinal direction of extension, the inner surface of the first rod and the outer surface of the second rod having respective first elliptically extending sections or sections that can be inscribed in an ellipse (E2, E3), transverse to said longitudinal direction of extension, the length of the semimajor axis (LMAX2b) of the first elliptical section of the inner surface of the first rod being greater than the length of the semimajor axis (LMAX3a) of the first elliptical section of the outer surface of the second rod, and the length of the semiminor axis (LMIN2b) of the first elliptical section of the inner surface of the first rod being smaller than the length of the semimajor axis (LMAX3a) of the first elliptical section of the outer surface of the second rod, - second respective elliptical sections of the inner surface of the first rod and the outer section of the second rod; the length of the semimajor axis of the second elliptical section of the inner surface of the first rod being greater than the length of the semimajor axis (SMAX3a) of the second elliptical section of the outer surface of the second rod, and the length of the semiminor axis (SMIN2b) of the second elliptical section of the inner surface of the first rod being smaller than the length of the semimajor axis (SMAX3a) of the second elliptical section of the outer surface of the second rod; said first and second elliptical sections alternating with each other along the longitudinal extent of their respective rods, - the lengths of the semimajor axes (SMAX3a) of the second elliptical sections being smaller than the lengths of the semimajor axes (LMAX3a) of the first elliptical sections of the outer surface of the second rod, and the lengths of the semiminor axes (SMIN2b) of the second elliptical sections are smaller than the lengths of the semiminor axes ()LMIN2b) of the first elliptical sections of the inner surface of the first rod, characterized in that the first and second elliptical sections extend on parallel planes, inclined to the longitudinal direction of extension of the respective rods.