Abstract: The present invention relates to a carina modification catheter capable of removing a protrusion (carina) of a stent installed in a branched blood vessel, and more particularly, to a catheter which can remove a protrusion of a stent in a branched blood vessel by being easily inserted into a main blood vessel and the branched blood vessel when adjustment of the position of stents installed in the main blood vessel and the branched blood vessel is required, thereby completely covering a branched-portion de novo lesion and reducing the possibility of instent-restenosis (ISR) in the blood vessel after the operation.