Article: article from journal or magazin.
Selbstexpandierende endoluminale Gefässprothesen: Experimentelle Grundlagen und Evaluation in vivo [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.
Animals, Aorta, Thoracic/surgery, Polyethylene Terephthalates, Polyurethanes, Porosity, Pressure, Stents, Swine, Swine, Miniature, Vascular Surgical Procedures/instrumentation
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