Use a wire cutter and remove the contaminated segment. I always have sterile wire cutters available in the center. Taught to me in my early days by a very experienced Rad Tech.

Tough situation, particularly if you are new to the team and you/they haven't had enough early cases together to mesh yet. We should all allow anyone in the procedure room to call out concerns or contaminations.. And then stop procedure to discuss. Without getting too "prudent" (it's a legal word, in case readers didn't pick up on that), you did just what a surgeon would do if a critical contamination occurred that jeopardizes completion of a procedure - like a saphenous vein for fem-pop getting suctioned to the container, or a kidney transplant being dropped. Never happened to me, of course, but thinking about it gives me a Halloween fright. I have heard and read of such things being wiped and treated with dilute betadine with successful outcomes.

Another suggestion is try to track a new 018 wire along the original. Sometimes works, no harm in trying, not going to make a low pressure rupture worse.

Ideally, if the external length of the clean portion of wire is equal to or greater than the length from your insertion site to the area past the rupture, you can cut the wire (I use Mayo scissors and just gnaw at it!) then swap out a new wire over any diagnostic catheter.
Otherwise is there a catheter that uses a rail system (like IVUS) but also has a port that will accommodate a new wire to pass through it? That would solve the problem.

If the catheter I asked about doesn’t exist, or you don’t have one, perhaps you could McGuyver one at the bedside. Id think about getting a conquest or dorado balloon, pole two holes in the balloon and use that as your rail over the bad wire then run a new wire throught the end once you crossed the rupture
Just a thought. Never done it!