title: MiniJFil®: A New Safe and Effective Stent for Well-Tolerated Repeated Extracorporeal Shockwave Lithotripsy or Ureteroscopy for Medium-to-Large Kidney Stones?
abstract: BACKGROUND
  Percutaneous nephrolithotomy (PCNL) is recommended for treating staghorn stones or stones measuring > 20 mm. Extracorporeal shockwave lithotripsy (ESWL) or flexible ureteroscopy (URS) may be used as a complement. However, PCNL can cause trauma to the kidney parenchyma, and patients may find a noninvasive procedure, such as ESWL, to be more attractive.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the clinical efficiency of MiniJFil® stenting associated with ESWL or second-line URS for the treatment of medium-to-large kidney stones. The MiniJFil® is a stent reduced to a suture of 0.3F attached to a renal pigtail. The entire ureter is occupied only by the suture of the stent.
  
  
  METHODS
  We retrospectively analyzed the data of 28 patients. Twenty-four patients had kidney stones measuring > 15 mm (group 1) and four patients had staghorn stones (group 2). All of the patients were fitted with MiniJFil® 2 - 3 weeks before any treatment. ESWL was always our first-line therapy. Stone-free (SF) status was defined as no evidence of stones.
  
  
  RESULTS
  In group 1, the mean largest and cumulative stone diameters, respectively, were 18.7 ± 5.7 mm and 45.0 ± 12.0 mm. In group 2, the mean volume was 6,288.4 ± 2,733.0 mm3. The overall SF was 96.4% (100% for group 1 and 75% for group 2). The mean number of sessions of ESWL and URS, respectively, was 1.4 ± 0.7 and 0.8 ± 0.9 in group 1 and 4.0 ± 2.0 and 1.5 ± 1.3 in group 2. The mean times to achieve these rates were 3.2 ± 1.7 months and 5.6 ± 2.3 months for groups 1 and 2, respectively. One patient in group 2 was treated with only three sessions of ESWL. Renal colic was observed in only five patients (17.9%).
  
  
  CONCLUSIONS
  MiniJFil® stenting is safe and may be an alternative for the treatment of kidney stones during minimally invasive procedures.
authors.affiliation: Department of Urology, Blois Polyclinic, La Chaussee Saint-Victor, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Vogt
authors.affiliation: Department of Urology, Blois Polyclinic, La Chaussee Saint-Victor, France.
authors.forename: Francois-Noel
authors.initials: FN
authors.lastname: Desfemmes
authors.affiliation: Department of Urology, Blois Polyclinic, La Chaussee Saint-Victor, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Desgrippes
authors.affiliation: Department of Urology, University of Sherbrooke, Sherbrooke, Canada.
authors.forename: Yves
authors.initials: Y
authors.lastname: Ponsot
keywords: Dilation; Lithotripsy; Staghorn Stone; Stent; Thread; Ureteroscopy