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catheter




A catheter is a tube tube used to drain or inject fluid, or to apply pressure to a vessel. Urinary catheters are commonly used to drain urine from the bladder. Other types are used to sample blood from the heart or to inject dye into the blood vessels during X-ray screening (see cardiac catheterization). Catheters are also used to unblock or widen obstructed blood vessels, or to control bleeding.


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   • HEALTH AND DISEASE