Selecting a Catheter. 1  The Foley catheter is used in almost all cases when an indwelling urinary catheter is required. 2  For routine, short-term catheterization in males or females, a 14F or 18F rubber catheter with a 10-mL balloon is satisfactory. 3  Men with prostatic hypertrophy may require larger catheters (eg, 20-22F).