A saline or heparin lock is a device that provides immediate intravenous access for administering intravenous drugs without the need to have intravenous fluids running continuously.

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Saline or heparin locks (also known as IV locks or hep-locks) allow healthcare professionals to administer intravenous medications or fluids without the need for a continuous infusion. The device is typically a small plastic catheter that is inserted into a vein and capped off with a sterile cap. When medications or fluids are needed, the cap can be removed and the lock accessed for direct administration. Saline or heparin may be used to flush the lock to maintain patency and prevent clotting.

A Saline or Heparin Lock Is a Device That Provides