Endovenous treatment assembly and device

An endovenous treatment assembly comprising:

• a wire element for delivering treatment doses, which is flexible and capable of being inserted, over a portion of its length, longitudinally into a vein;
• a positioning and guiding part that is integral with and manipulates the wire element, said positioning and guiding part comprising:
• at least a first guiding element for guiding in translation a first portion of the wire element for delivering treatment doses in the direction of its length, where the wire element is able to slide in the direction of its length relative to said first guiding element;
• and,
• a first mechanical assembly allowing for the removable mounting of the positioning and guiding part relative to a drive system, so that said first portion of the wire element for delivering treatment doses can be positioned and guided by the positioning and guiding part so as to be able to be engaged with the system drive for driving the wire element in the direction of its length in at least in a first direction.