an instrument that allows fluid to pass from or into
a body cavity. Certain type of catheters are semi-permanent lines inserted
into a vein to infuse substances (e.g., drugs, nutrients) into the bloodstream.
A central catheter delivers substances directly into a major vein in the
chest; an indwelling catheter is inserted beneath the skin.
CatheterJAMA A tubular medical device for insertion into canals, vessels, passageways, or cavities of the body, usually to
permit injection (eg, through an intravenous catheter into a vein) or withdrawal of fluids or to keep a
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