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A heparin or saline lock is an IV without being attached to that damn pole. Conventional IVs attach to a tube that leads to a solution bag hanging on the pole. A lock is an IV that is attached to a little chamber on your hand filled with either saline or heparin, thus the name. It is about the size of a nickel and provides access to your venous system if the nurses need to give you any medication fast but allows you freedom of movement (no tubes or poles).
Heparin flush is injected directly into the catheter lock of your IV (intravenous) line. You may be shown how to use heparin flush at home. Do not use heparin flush if you do not fully understand how to flush your IV line and properly dispose of used needles, IV tubing, and other items used to inject your medicines.