The invention relates to a catheter device comprising a drive shaft (4) connected to a motor (7) and a rotor (3.2) attached to the distal end region of the drive shaft. The rotor has a frame structure (3.2.1) comprised of a helical limiting frame (3.2.2) and rotor struts (3.2.3) extending radially inwards from the limiting frame. The rotor struts are attached to the drive shaft on the ends thereof distant from the limiting frame. An electrical lining extends between the limiting frame and the drive shaft. The frame structure, made of an elastic material, is configured such that the rotor independently deploys after a forced compression.