title: [Nasolacrimal stent: modifications to Ho-Young Song's technique].
abstract: OBJECTIVE
  To introduce modifications to Song's technique in the treatment of nasolacrimal occlusion by means of a polyuretane stent.
  
  
  METHODS
  Thirty five polyuretane stents were placed under fluoroscopic guidance in 32 patients diagnosed with total and partial nasolacrimal occlusion.
  
  
  CONCLUSIONS
  Technical success rate was 90%. Sixteen right and nineteen left nasolacrimal systems were probed. The introduction of a guidewire through the lower punctum, the use of a Ritleng guide, a Crawford hook and ocular protectors are modifications of Song's procedure that may help in successfully performing this technique in a fast and easy way.
authors.affiliation: Servicios de Oftalmología y Radiología de H.C.U. de Zaragoza, España.
authors.forename: M F
authors.initials: MF
authors.lastname: Perena
authors.forename: J
authors.initials: J
authors.lastname: Castillo
authors.forename: J
authors.initials: J
authors.lastname: Medrano
authors.forename: M A
authors.initials: MA
authors.lastname: De Gregorio
authors.forename: E
authors.initials: E
authors.lastname: Loras
authors.forename: A
authors.initials: A
authors.lastname: Palomar
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003608:Dacryocystorhinostomy; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009301:Nasolacrimal Duct; D013508:Ophthalmologic Surgical Procedures / Q000295:instrumentation / Q000379:methods*; D011140:Polyurethanes; D015607:Stents
chemical_list: D011140:Polyurethanes