Cannula and Catheter

Cannula noun - A small flexible tube inserted into a body cavity for draining off fluid or introducing medication.

Catheter and cannula are semantically related. In some cases you can use "Catheter" instead a noun "Cannula".

Catheter noun - A thin flexible tube inserted into the body to permit introduction or withdrawal of fluids or to keep the passageway open.

Cannula and catheter are semantically related. You can use "Cannula" instead a noun "Catheter".