Dilatation of stent-grafts by luminal pressures: experimental evaluation of polytetrafluoroethylene (PTFE) and woven polyester grafts.
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.
Suzuki
K
K
Department of Radiology, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan.
Ishiguchi
T
T
Kawatsu
S
S
Iwai
H
H
Maruyama
K
K
Ishigaki
T
T
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
D011091:Polyesters; D011138:Polytetrafluoroethylene