title: Dilatation of stent-grafts by luminal pressures: experimental evaluation of polytetrafluoroethylene (PTFE) and woven polyester grafts.
abstract: OBJECTIVE
  To evaluate the effect on dilatation of three types of covering materials used for endovascular stent-grafts.
  
  
  METHODS
  Stent-grafts with three types of covering material [0.1-mm polytetrafluoroethylene (PTFE), 0.2-mm PTFE, and 0.15-mm woven polyester] were placed in a fluid circuit. For the pulsatile pressure test, the luminal pressure of 190/130 mmHg was loaded up to 300,000 pulses. For the static pressure test, the luminal pressure was increased from 50 to 300 mmHg at 50-mmHg increments. The percent of dilatation of each stent-graft was compared.
  
  
  RESULTS
  The 0.1-mm PTFE stent-graft was significantly more dilated than the 0.2-mm PTFE and the 0.15-mm woven polyester stent-graft (p < 0.005) in both examinations. There was no significant difference between the 0.2-mm PTFE and the 0.15-mm woven polyester stent-grafts. The dilatation of the 0.1-mm PTFE stent-graft was irreversible.
  
  
  CONCLUSIONS
  The 0.15-mm woven polyester and the 0.2-mm PTFE stent-grafts may be preferable to the 0.1-mm PTFE stent-graft with regard to dilatation and deformity.
authors.affiliation: Department of Radiology, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Ishiguchi
authors.forename: S
authors.initials: S
authors.lastname: Kawatsu
authors.forename: H
authors.initials: H
authors.lastname: Iwai
authors.forename: K
authors.initials: K
authors.lastname: Maruyama
authors.forename: T
authors.initials: T
authors.lastname: Ishigaki
mesh_terms: D001014:Aortic Aneurysm / Q000628:therapy; D002404:Catheterization; D006801:Humans; D008962:Models, Theoretical; D011091:Polyesters; D011138:Polytetrafluoroethylene; D011673:Pulsatile Flow / Q000502:physiology*; D011674:Pulse; D015607:Stents
chemical_list: D011091:Polyesters; D011138:Polytetrafluoroethylene