I -catheter ye-Urinary yi-tube efakwe esiqwini nge-urethra ukuze ichithe umchamo. Ngemuva kokuthi i-catheter ifakwe esihlalweni, kunebhaluni eliseduze nekhanda le-catheter ukulungisa i-catheter i-tube ihlala esikhwameni futhi akulula ukuphuma esikhwameni somchamo ukuqoqa umchamo. Ngokusho kwe-matrial engavuthiwe, ama-mathters u-Urinary angahlukaniswa abe yi-catheter yemvelo yerabhi, i-silicone rubber catheter noma i-polyvinyl chloride catheter (i-catheter ye-PVC).