saline locks,heparin locks and such stuffs

It's been awhile, but just to let you nurses in the old country a little taste of nursing in the USA, we seldom keep patients (at least the doctors don't) on iv fluids for a long time on a keep vein open anymore. We get patients with a saline lock(hep lock works the same way) or maybe two if they are in telemetry and anytime an iv is ordered, we just hook them up. Of course, the iv sites need to be replaced every 3 days and the iv tubing every 24 hours. Infusion pumps are routine here too. I wonder if we use these saline locks routinely in the Philippines already?