[Self-expanding endoluminal vascular prosthesis: experimental basis and in-vivo evaluation].
The present study investigates the physical properties and the in vivo application of in vivo of a self-expandable stent (Wallstent) with an incorporated sealant of microporous polyurethane. Measurements of diameter and length as a function axial load featured the data for the calculation for radial pressure. Porosity control was assessed in comparison to non gelatin-sealed knitted Dacron. 11 stents on a 11.5F catheter were inserted in the aorta of three minipigs and evaluated by pressure measurement and angiography. The coverage of the stent causes an increase of 0.05-0.1 bar of radial pressure. The graph received by calculations demonstrates the corresponding pressure for every given diameter of the stents. Porosity is similar to the Dacron graft. The patency-rate is 100%. Characteristics of this covered stents meet requirements of an endovascular prostheses. Exclusion of fistulas and small aneurysms seems to be possible.
Marty
B
B
Klinik für Herz- und Gefässchirurgie, Universitätsspital Zürich.
Marty
T
T
von Segesser
L K
LK
Turina
M
M
D000818:Animals; D001013:Aorta, Thoracic / Q000601:surgery; D011093:Polyethylene Terephthalates; D011140:Polyurethanes; D016062:Porosity; D011312:Pressure; D015607:Stents; D013552:Swine; D013556:Swine, Miniature; D014656:Vascular Surgical Procedures / Q000295:instrumentation*
D011093:Polyethylene Terephthalates; D011140:Polyurethanes
Selbstexpandierende endoluminale Gefässprothesen: Experimentelle Grundlagen und Evaluation in vivo.