Ihe nkedo nke urinary catheter bụ tube nke a na-etinye n'ime eriri afo site na urethra iji wepụ mmamịrị.Mgbe etinyere catheter n'ime eriri afo, enwere balloon n'akụkụ isi nke catheter iji dozie catheter tube ahụ na-anọ n'ime eriri afo ma ọ dịghị mfe ịpụta, a na-ejikọta tube drainage na akpa mmamịrị iji nakọta mmamịrị. .Dị ka ihe dị iche iche matrials si kwuo, maka urinary catheter eke roba catheter, silicone a na-ekewa ndị na-ahụ roba catheter ma ọ bụ polyvinyl chloride catheter (PVC catheter).