title: Variables affecting deflection of a new third-generation flexible ureteropyeloscope (DUR-8 elite).
abstract: OBJECTIVE
  We performed an ex vivo study to measure the effects of various factors on the deflection angles of a new flexible ureteroscope with active primary and secondary deflections.
  
  
  METHODS
  Active primary and secondary deflections in different sequences were measured initially without working devices (baseline measures). Nine different working instruments were then placed in the working channel, and alterations in ureteroscope deflectability were measured.
  
  
  RESULTS
  Baseline measures showed excellent angles of deflections, consistent with the manufacturer's reporting. Among the wires tested, only the stiff wire had a negative (minor) impact on deflectability. There were similar minimal decreases of deflection with baskets. The 1.6F electrohydraulic lithotripsy (EHL) probe had minimal influence on deflectability compared with the 3.0F EHL probe. The 200-microm and 365-microm laser fibers significantly (>20 degrees ) decreased the angles of deflection.
  
  
  CONCLUSIONS
  In spite of the changes in deflectability with almost all working instruments, there were no significant decreases in the angles with most of them. The sequence is important in obtaining optimal deflection.
authors.affiliation: Department of Urology, University of Miami School of Medicine, Miami, Florida 33101, USA. lobikpost@hotmail.com
authors.forename: Leonid
authors.initials: L
authors.lastname: Lobik
authors.forename: Alvin
authors.initials: A
authors.lastname: Lopez-Pujals
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Leveillee
mesh_terms: D004867:Equipment Design; D007682:Kidney Pelvis; D020709:Ureteroscopes