Source:http://linkedlifedata.com/resource/umls/id/C0687329
UMD: Needle sets that include a large-bore (typically 16 G) winged needle. During use, the Luer fitting is attached to a hemodialysis pheresis set. Usually, two needle sets are used simultaneously per dialysis patient, with one needle inserted in a vein and the other inserted in an artery. Both needles are kept in the patient until the hemodialysis procedure is completed.