A catheter apparatus having proximal end and distal end for insertion intopatient's body,catheter apparatus comprising: catheter having proximal end and distal end；first and secondlumens for accommodating first and second guidewires respectively, each lumencomprisingdistal opening, distal openings of first and second lumens moveable relativeto each other； andan actuator for controllably changing separation between distal openings offirst and secondlumens； wherein plurality of first lumen and/or plurality of second lumen areprovided, to provideplurality of selectable lumens for accommodating first and/or secondguidewires； whereincatheter apparatus further comprises first lumen and plurality of secondlumens, and distalopenings of plurality of second lumens are arranged around distal opening offirst lumen, andactuator for controllably changing separation between distal openings oflumens is arranged tomove distal openings of second lumens in radial directions from distal openingof first lumen.
