title: Which ureteral access sheath is compatible with your flexible ureteroscope?
abstract: OBJECTIVE
  Our aim is to evaluate different ureteral access sheaths (UASs), which are available in the international market and their compatibility with different available flexible ureteroscopes (F-URSs) to help the urologist choose the proper ureteral access sheath for his or her endoscope before commencing the procedure.
  
  
  METHODS
  A total of 21 UASs and 12 F-URSs were evaluated. Measurements were obtained in French (F) units considering different characteristics for each UAS and each F-URS. Insertion test without friction between F-URS and UAS was considered as a successful test and was referred as (YES).
  
  
  RESULTS
  All UASs and F-URSs were successfully submitted to the insertion test. All F-URSs that were inserted into UASs without friction had an internal diameter of at least 12F. Different lengths of UAS did not influence the test outcome.
  
  
  CONCLUSIONS
  This study was able to establish a correlation table between different UASs and different flexible ureteroscopes. As of now, the 12/14F UAS is considered the universal UAS that accepts all F-URSs that are available in the endourology field. Nevertheless, we are expecting a significant change with the new standard size 10/12F UAS as well as huge advances in minimizing the size of different endoscopes.
authors.affiliation: Department of Urology, Tenon University Hospital , Pierre and Marie Curie University, Paris, France .
authors.forename: Saeed M
authors.initials: SM
authors.lastname: Al-Qahtani
authors.forename: Julien
authors.initials: J
authors.lastname: Letendre
authors.forename: Alexandre
authors.initials: A
authors.lastname: Thomas
authors.forename: Ricardo
authors.initials: R
authors.lastname: Natalin
authors.forename: Thibaud
authors.initials: T
authors.lastname: Saussez
authors.forename: Olivier
authors.initials: O
authors.lastname: Traxer
mesh_terms: D004867:Equipment Design; D006801:Humans; D007669:Kidney Calculi / Q000601:surgery*; D015203:Reproducibility of Results; D020709:Ureteroscopes; D018666:Ureteroscopy / Q000379:methods*