What is a catheter that does not urinate?

If a catheter has been placed but no urine is coming out of the catheter, there are two reasons to consider. One is the impairment of renal function itself, or the obstruction of both ureters, and there is no urine in the bladder itself. Another reason to consider is the catheter itself. First, check whether the catheter is unobstructed or whether the catheter has been placed in the bladder. If necessary, re-indwelling the catheter is necessary.