1Rozanski TA,Salazar F,Thompson IM. Direct vision bladder catheterization using a short rigid ureteroscope. Urology, 1998,51 (5) : 827-828.
2Isen K. A technique using a resectoscope sheath under direct vi- sion and nasogastric tube for difficult catheterization following TURP. Can Urol Assoc J,2010,4(6):434.
3Villanueva C, Hemstreet GP. Difficult male urethral catheteriza- tion: a review of different approaches. Int Braz J Urol,2008,34 (4) :401-412.