三、导尿管的种类 Urethral catheter types Catheters are sized in units called French One Fr equals 1/3 of 1 mm Catheters vary from 12(small) Fr to 48 (large)Fr(3-16 mm) in size• Catheters are sized in units called French • One Fr equals 1/3 of 1 mm • Catheters vary from 12 (small) Fr to 48 (large) Fr (3-16 mm) in size 三、导尿管的种类 Urethral catheter types