A hollow tube to allow passage of fluid into or out of a body cavity, organ, or vessel is a:

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A catheter is a medical device used to allow passage of fluid into or out of a body cavity, organ, or vessel. It is a hollow tube that can be inserted into a blood vessel, urinary tract, or other body part to facilitate drainage or delivery of fluids. Ventilators, transducers, cardioverter, and respirators are not typically used for this purpose.

A Hollow Tube to Allow Passage of Fluid into or Out