名詞 catheter:

1. a thin flexible tube inserted into the body to permit introduction or withdrawal of fluids or to keep the passageway open

cath.e.ter

n.（名詞）
A hollow, flexible tube for insertion into a body cavity, duct, or vessel to allow the passage of fluids or distend a passageway. Its uses include the drainage of urine from the bladder through the urethra or insertion through a blood vessel into the heart for diagnostic purposes.
導管：可彎曲的中空管子，用以插入體腔管道或血管以導入液體或擴張通道。其作用包括通過尿道從膀胱引流液體或通過血管插入心臟以達到檢查的目的

來源：
Late Latin
后期拉丁語
from Greek kathetôr
源自 希臘語 kathetôr
from kathienai [to send down]
源自 kathienai [放下]
kat-, kata- [cata-]
kat-, kata- [前綴，表.向下，相反.]
hiônai hô- [to send] * see yô-
hiônai hô- [送] *參見 yô-