Covered, retrievable, expandable urethral nitinol stent: feasibility study in dogs

Radiology
Gi-Young KoHo-Young Song

Abstract

To evaluate the feasibility of using a retrievable urethral stent and to evaluate whether granulation tissue resolves after stent removal in a canine urethra. Polyurethane-covered retrievable 0.10-mm-thick (n = 11) or 0.15-mm-thick (n = 10) nitinol wire stents were placed in the urethras of 20 dogs. In one dog, a second stent was placed in the urethra because of complete migration of the first stent into the urinary bladder. The stents were removed with retrieval hook wires 4 weeks (n = 10) and 8 weeks (n = 10) after placement. Fourteen dogs were sacrificed just after stent removal, and the other six dogs were sacrificed 2 weeks after stent removal. Information concerning procedure success, stent migration, and tissue response was obtained. Stent placement was technically successful in all dogs. Follow-up urethrograms showed partial (n = 4) or complete (n = 1) stent migration. Stent removal failed in two dogs due to partial or complete migration. Granulation tissue was observed at both ends of the stent in 17 dogs. Urethrograms and urethral specimens obtained 2 weeks after stent removal showed diminished granulation tissue and decreased thickness of the papillary projections of the epithelium compared with results obtained imme...Continue Reading

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Citations

Apr 17, 2007·Cardiovascular and Interventional Radiology·Verónica CrisóstomoJesús Usón-Gargallo
Jan 25, 2008·Cardiovascular and Interventional Radiology·Hwan-Hoon ChungMahmood K Razavi
Mar 11, 2006·European Radiology·Ji Hoon ShinKyu-Bo Sung
Jan 23, 2003·Current Urology Reports·Darren T BeikoJohn D Denstedt
Jun 21, 2003·Journal of Endourology·Darren T BeikoJohn D Denstedt
Apr 1, 2010·Therapeutic Advances in Urology·Abdulrahman Al-AownEvangelos Liatsikos
Nov 22, 2007·AJR. American Journal of Roentgenology·Eugene K ChoiChoung-Soo Kim
Apr 4, 2013·Journal of the American Veterinary Medical Association·Ann-Marie Della MaggioreJodi L Westropp
Jul 3, 2004·Journal of Vascular and Interventional Radiology : JVIR·Ji Hoon ShinJean Hwa Lee
Oct 29, 2010·Journal of Vascular and Interventional Radiology : JVIR·Yong-Dong LiGyungyub Gong
Dec 5, 2006·Journal of Vascular and Interventional Radiology : JVIR·Chang Jin YoonHyun-Ki Yoon
May 6, 2004·The Journal of Urology·Darren T BeikoJohn D Denstedt

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