My father is 85 years old. 3 years ago a vertabra fractured due to metastasized prostate cancer ( good news, though, on that - his PSA level has been normal since undergoing hormone shots every six months). Although he can move his lower body he can no longer bear weight has been wheelchair bound and has had an indwelling Foley catheter since the cancer was discovered. He is now, of course, experiencing chronic UTI's and his creatinine level has risen dramatically with the last course of antibiotics (he is developing some resistance to antibiotic treatment). What might be the next steps to control the UTI's without putting his kidneys at elevated risk?