conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

insert a catheter into (a body part)

insert a catheter into (a body part)

a catheter that is inserted into the trachea through the mouth or nose in order to maintain an open air passage or to deliver oxygen or to permit the suctioning of mucus or to prevent aspiration of the stomach contents

In medicine, a central venous catheter ("central line", "CVC", "central venous line" or "central venous access catheter") is a catheter placed into a large vein in the neck (internal jugular vein), chest (subclavian vein or axillary vein) or groin (femoral vein); it is used to administer medication or fluids, obtain blood tests (specifically the "central venous oxygen saturation"), and measure central venous pressure.

a catheter placed into a peripheral vein for intravenous therapy such as medication fluids.