title: Development of a new hanging-type esophageal stent for preventing migration: a preliminary study in an animal model of esophagotracheal fistula.
abstract: OBJECTIVE
  Covered, self-expandable metallic stents (SEMS) have been enthusiastically adopted for the treatment of esophagotracheal fistula, but problems with stent migration have yet to be resolved. To overcome this problem, we have developed a new hanging-type esophageal stent designed to prevent migration, and we conducted an animal study to assess the efficacy of our method.
  
  
  METHODS
  A total of six female pigs were used in this study. The main characteristic of our stent was the presence of a string tied to the proximal edge of the stent for fixation under the skin of the neck. The first experiment was performed to confirm technical feasibility in three pigs with esophagotracheal fistula. The second experiment was performed to evaluate stent migration and esophagotracheal fistula in three pigs.
  
  
  RESULTS
  Creation of the esophagotracheal fistula and stent placement were technically successful in all pigs. In the first experiment, esophagotracheal fistula was sealed by stent placement. In the second experiment, no stent migration was seen 11 or 12 days after stent placement. Gross findings showed no fistulas on the esophageal or tracheal wall.
  
  
  CONCLUSIONS
  Our new hanging-type esophageal stent seems to offer a feasible method for preventing stent migration.
authors.affiliation: Department of Radiology, Tottori University, Yonago, Tottori, Japan. masay010@yahoo.co.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Endo
authors.forename: Toshio
authors.initials: T
authors.lastname: Kaminou
authors.forename: Yasufumi
authors.initials: Y
authors.lastname: Ohuchi
authors.forename: Kimihiko
authors.initials: K
authors.lastname: Sugiura
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Yata
authors.forename: Akira
authors.initials: A
authors.lastname: Adachi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kawai
authors.forename: Syohei
authors.initials: S
authors.lastname: Takasugi
authors.forename: Shuichi
authors.initials: S
authors.lastname: Yamamoto
authors.forename: Kensuke
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Ihaya
authors.forename: Toshihide
authors.initials: T
authors.lastname: Ogawa
mesh_terms: D000818:Animals; D005240:Feasibility Studies; D005260:Female; D005548:Foreign-Body Migration / Q000517:prevention & control*; D023421:Models, Animal; D011474:Prosthesis Design; D015607:Stents; D013552:Swine; D014138:Tracheoesophageal Fistula / Q000601:surgery*