Izikhwama zokukhipha umchamo ziqoqa umchamo. Isikhwama sizonamathisela ku-catheter (evame ukubiza i-Foley catheter) engaphakathi kwesinye.
Abantu bangase babe ne-catheter kanye nesikhwama sokudonsa umchamo ngenxa yokuthi banokungakwazi ukuchama (ukuvuza), ukugcinwa komchamo (ukungakwazi ukuchama), ukuhlinzwa okwenza i-catheter idingekile, noma enye inkinga yezempilo.