I- catheter yomchamo iyishubhu elifakwa esinyeni nge-urethra ukukhipha umchamo.Ngemva kokuba i-catheter ifakwe esinyeni, kunebhaluni eduze kwekhanda le-catheter ukulungisa i-catheter Ishubhu lihlala esinyeni futhi akulula ukuphuma, futhi ishubhu lokukhipha amanzi lixhunywe esikhwameni somchamo ukuze kuqoqwe umchamo. .Ngokusho kwe-dfferent matrial, ama-catheter omchamo angahlukaniswa abe yi-catheter yerabha yemvelo, i-silicone yerabha catheter noma i-polyvinyl chloride catheter (i-PVC catheter).