title: Knitted nitinol stent insertion for various intestinal stenoses with a modified delivery system.
abstract: BACKGROUND
  Insertion of metallic stents for esophageal stenoses is well established, but these stents are technically difficult to place elsewhere in the GI tract. Moreover, major complications have occurred when metal stents with sharp ends have been placed in these locations. The currently available flexible, blunt-ended, knitted nitinol stent is intended for use only in the esophagus. Because its short delivery system cannot reach segments of the gut distal to the esophagus, the delivery device was modified to facilitate intestinal access, and its performance was evaluated in the treatment of malignant intestinal obstructions.
  
  
  METHODS
  The Ultraflex delivery system was modified by connecting an additional plastic tube and a suture cord; the length was increased from 95 cm to 150 cm or more. Stents used were 18 to 23 mm in diameter, and 10 to 15 cm in length. A knitted metal stent was inserted by using the modified delivery system in 10 patients (7 men, 3 women, mean age 68 years); 8 with gastric outlet, 1 with jejunal, and 1 with proximal colonic obstruction.
  
  
  RESULTS
  Metal stent insertion was successful in all patients with significant relief of symptoms and restoration of the ability to eat. The patient with a jejunal stent required placement of a second stent because of bending of the initial stent. No major complications (migration or perforation) occurred.
  
  
  CONCLUSIONS
  This technique appears to facilitate placement of a metal stent with blunt ends in the duodenum, small intestine, and proximal colon. Manufacturers should offer blunt-ended stents with long delivery devices.
authors.affiliation: Third Department of Internal Medicine and Division of Digestive Endoscopy, Toho University School of Medicine, Ohashi Hospital, Tokyo, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Maetani
authors.forename: T
authors.initials: T
authors.lastname: Ukita
authors.forename: H
authors.initials: H
authors.lastname: Inone
authors.forename: M
authors.initials: M
authors.lastname: Yoshida
authors.forename: Y
authors.initials: Y
authors.lastname: Igarashi
authors.forename: Y
authors.initials: Y
authors.lastname: Sakai
mesh_terms: D000368:Aged; D000497:Alloys; D004867:Equipment Design; D005260:Female; D017219:Gastric Outlet Obstruction / Q000628:therapy*; D006801:Humans; D007415:Intestinal Obstruction / Q000628:therapy*; D008297:Male; D015607:Stents
chemical_list: D000497:Alloys; C013616:nitinol