title: Assessment of novel ureteral occlusion device and comparison with stone cone in prevention of stone fragment migration during lithotripsy.
abstract: OBJECTIVE
  To present the initial ex-vivo results of a new ureteral-occlusion device (Cook Urological, Spencer, IN) for preventing the retrograde migration of particles during ureteroscopy and its comparison with the Stone Cone (Microvasive-Boston Scientific Corp., Spencer, IN).
  
  
  METHODS
  We designed an ex-vivo model using a porcine kidney with an intact ureter. Standardized plastic beads were placed in the proximal ureter. Each device was deployed proximal to the beads during ureteroscopy, and the number of beads impeded by each device was recorded.
  
  
  RESULTS
  The new device was successful at preventing retrograde migration of beads > or = 1.5 mm. Furthermore, 1.0-mm beads were impeded by the center of the device, although they passed through the periphery. The Stone Cone blocked the retrograde migration of beads > or = 2.5 mm.
  
  
  CONCLUSIONS
  The new occlusion device was efficacious in an ex-vivo model. It appears to prevent the migration of smaller particles than are blocked by the Stone Cone.
authors.affiliation: Department of Urology, Loyola University Medical Center, Maywood, Illinois 60153, USA.
authors.forename: Paulette G
authors.initials: PG
authors.lastname: Holley
authors.forename: Sameer K
authors.initials: SK
authors.lastname: Sharma
authors.forename: Kent T
authors.initials: KT
authors.lastname: Perry
authors.forename: Thomas M T
authors.initials: TM
authors.lastname: Turk
mesh_terms: D000818:Animals; D004867:Equipment Design; D005548:Foreign-Body Migration / Q000517:prevention & control*; D008096:Lithotripsy / Q000295:instrumentation*; D023421:Models, Animal; D013552:Swine; D014514:Ureteral Calculi / Q000601:surgery*; D014517:Ureteral Obstruction / Q000601:surgery*; D018666:Ureteroscopy