Source:http://linkedlifedata.com/resource/umls/id/C1611657
UMD: Vascular catheters used to infuse blood, fluids, electrolytes, medications or parenteral nutrition solutions; most of them are also used to monitor arterial blood gases or central venous pressure and to withdraw blood samples. These catheters may be located for permanent use (i.e., indwelling catheters), during short periods (several days), or specially designed for long-term (weeks, months, or even years) use.