Catheter

n. tube used to drain body fluids or to keep a passage open (Medical)

In medicine a catheter is a tube that can be inserted into a body cavity, duct or vessel. Catheters thereby allow drainage or injection of fluids or access by surgical instruments. The process of inserting a catheter is catheterisation. In most uses a catheter is a thin, flexible tube: a "soft" catheter; in some uses, it is a larger, solid tube: a "hard" catheter.
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Catheter /cath·e·ter/ 1. a tubular, flexible surgical instrument that is inserted into a cavity of the body to withdraw or introduce fluid. 2. [more]Catheter - Community and Resources

Noun
1. a thin flexible tube inserted into the body to permit introduction or withdrawal of fluids or to keep the passageway open
(hypernym) tube, tubing
(hyponym) endotracheal tube
(derivation) catheterize, catheterise

n. catheter, tube used to drain body fluids or to keep a passage open (Medical)