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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).
Intravenous patient-controlled analgesia (IV PCA) is a widely accepted standard for management of acute postoperative pain. PCA devices consist of programmable pumps and activation buttons. The ordering physician controls the infusion rate, bolus volume, maximum allowable hourly dose, and lockout time. The patient controls the activation button triggering a bolus opioid dose through an intravenous line.