Frequent male urinary tract infections?

I'm a caregiver and I help take care of this man who in the past 6-7 has had reoccuring uti infections. He is prescribed antibiotics for them but they continue to come back so bad that he becomes incoherent, runs fevers, dehydrated and has been in and out of the hospital countless times. Can anyone tell me what may be causing these?. Also he is disabled, using a wheelchair is non mobile at all, has a suprapubic catherter and a concave colostomy if any of this information is helpful and/or relevent. He's such a wonderful guy

He doesn't have diabetes, nor BPH, he has had his catheter for over 5 years+ without incidents like this, His catheter is changed monthly by his neurologist only, and irrigated twice daily at home by his caregivers. He does only have one kidney and had a kidney stone which his neurologist thought may be the problem removed but the stone was removed several months ago and the UTI's keep returning. He had had all kinds of labs, i.e bloodwork, urine cultures/specimens, catscans, x-rays of abdomen ect. His neurologist, primary doctor, and the local hospital can't seem to figure out why he keeps getting the UTI'S so they just keep treating the UTI'S, but if they had an idea what is causing them they could work on that.

Check catheter patency frequently. Continue with good perineum care. Recurrent UTI's are usually due to urinary stasis. Have the doctor due blood work and cultures. I would check kidney function and electolytes.Does he have any other diagnosis such as BPH or diabetes? He sounds like he needs IV therapy for hydration and a good course of antibiotics. I admire your concern as a caregiver.

the cath is causing the problems and poor hygeine. advise the doctor and have a nurse train you in the proper way to change/clean a cath. always use gloves. he needs to drink more water.