Comparison of a new polytetrafluoroethylene-covered metallic stent to a noncovered stent in canine ureters

Cardiovascular and Interventional Radiology
Hwan-Hoon ChungMahmood K Razavi

Abstract

The aim of this study was to determine the feasibility of using a newly designed polytetrafluoroethylene (PTFE)-covered metallic stent in the ureter by comparing its effectiveness with that of the noncovered stent in a canine model. We placed 14 stents in the ureters of seven mongrel dogs that weighed 30-40 kg each. The covered and noncovered stents were deployed in the right and left ureters, respectively, of six dogs. In the seventh dog, a covered stent and a double-J catheter were inserted in the right ureter, and a covered stent only was inserted in the left ureter. The first six dogs were sacrificed at 5, 10, and 15 weeks after deployment of the stents (two for each follow-up period), and the seventh dog was sacrificed at 30 weeks. There was no migration or poor expansion of any of the stents observed on plain radiography. On intravenous pyelogram and retrograde pyelogram, all of the covered stents at each follow-up period had patent lumens at the stented segments without hydronephrosis, and the passage of contrast material through it was well preserved. The noncovered stents in the dogs sacrificed at 5 and 10 weeks and one of the two dogs sacrificed at 15 weeks showed near-complete occlusion of the stent lumen due to ingr...Continue Reading

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Citations

Apr 1, 2010·Therapeutic Advances in Urology·Abdulrahman Al-AownEvangelos Liatsikos
Mar 23, 2011·The Journal of Urology·Federico SoriaFrancisco M Sánchez
Nov 11, 2010·BJU International·Hung-Jen WangPo Hui Chiang
Nov 26, 2010·Australian Veterinary Journal·N I ChristensenV Langova
Dec 3, 2014·The Journal of Urology·Julia FiukJohn D Denstedt
May 8, 2009·Expert Review of Medical Devices·Evangelos LiatsikosDimitrios Karnabatidis
Apr 11, 2018·Current Urology Reports·Ali MosayyebiBhaskar K Somani
Jul 3, 2018·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Jong Woo KimBaek-Yeol Ryoo

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