I'm just wondering if the instructor didn't know what an INT was, or if she just didn't know what INT stood for. There are alot of people that use acronyms for equipment but don't know what the acronym stands for. As long as she knows the applications and proper usage of an INT cap (saline lock) then what does it matter if she knows what INT stands for? We've only ever used the term saline lock. Plus we have two variations. 7" tubed and simple lock(no tubing). The nurses in the ED prefer the ones with the tubing, so those are the ones I usually order. We usually add the lock to the IV tubing so the whole system is filled when we charge the line. Then, since the hospital uses a different gtts, it's easier for them to change.