title: Use of a working channel catheter during flexible ureteroscopic laser lithotripsy.
abstract: OBJECTIVE
  We describe a technique which protects the working channel of the flexible ureteroscope from damage caused by the laser fiber during laser lithotripsy.
  
  
  METHODS
  A 2Fr catheter is placed into the working channel of the flexible ureteroscope. A 200 micro. laser fiber is then advanced through the lumen of the catheter and laser lithotripsy is subsequently performed.
  
  
  RESULTS
  The catheter provides additional protection to the working channel sheath during passage and firing of the laser fiber. Deflection of the ureteroscope is not affected with the catheter in place. Movement of the laser fiber is augmented by the catheter when compared to movement of the fiber in the working channel alone. Irrigant flow is diminished with the catheter.
  
  
  CONCLUSIONS
  The catheter does not appear to hinder performance of the flexible ureteroscope during laser lithotripsy. A catheter also offers additional protection to the working channel sheath, thereby potentially increasing the durability and working life of the flexible ureteroscope.
authors.affiliation: Department of Surgery, Section of Urology, University of Michigan Medical Center, Ann Arbor, Michigan, USA.
authors.forename: B K
authors.initials: BK
authors.lastname: Hollenbeck
authors.forename: S L
authors.initials: SL
authors.lastname: Spencer
authors.forename: G J
authors.initials: GJ
authors.lastname: Faerber
mesh_terms: D006801:Humans; D017602:Lithotripsy, Laser / Q000379:methods*; D014514:Ureteral Calculi / Q000628:therapy*; D018666:Ureteroscopy