| In-vivo evaluation of flow characteristics of novel metal ureteral stent. | |
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MedLine Citation:
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PMID: 17705771 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To characterize the flow of a novel ureteral stent composed of a nickel-cobalt-chromium-molybde-num alloy and compare it with flow in a standard ureteral stent. MATERIALS AND METHODS: Six 6F Resonance stents and six 6F standard Black Beauty ureteral stents were placed in six Yucatan minipigs, with each pig serving as its own control. Flow assessment was performed on all stents via a nephrostomy tube delivering a standard rate of 0.9% saline at 35 cm H(2)O. Flow studies on the standard stents encompassed extraluminal (i.e., lumen of stent occluded with a guidewire), intraluminal (i.e., ureter secured to stent with a constricting suture), and combined (i.e., open lumen without constricting suture) flow. In the Resonance stent, only combined and intraluminal flow could be addressed, as there is no access to the lumen of this stent. RESULTS: With the Resonance stent, intraluminal flow was much greater than combined flow, with mean values of 5.15 mL/min and 2.50 mL/min, respectively (P = 0.057; SD = 7.73). Intraluminal flow was similar to combined flow in the 6F standard stent, with mean values of 7.34 mL/min and 7.30 mL/min, respectively (P = 0.88; SD = 1.76). The standard stent had significantly greater combined flow than the Resonance stent (P = 0.023) but not intraluminal flow (P = 0.247). Of note, whereas it was possible to occlude the 6F standard stent completely with a ureteral ligature (i.e., no guidewire placed in the lumen), it was not possible to occlude the Resonance stent regardless of how tightly the suture was tied. CONCLUSION: The Resonance metal alloy stent provides less overall flow than a standard stent. However, under circumstances of extrinsic ureteral compression sufficient to occlude a standard stent (e.g., extrinsic compression plus an internal guidewire), the metal stent continues to provide satisfactory drainage. |
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Authors:
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Sarah D Blaschko; Leslie Allan Deane; Alfred Krebs; Corollos S Abdelshehid; Farhan Khan; James Borin; Alex Nguyen; Elspeth M McDougall; Ralph V Clayman |
Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: Journal of endourology / Endourological Society Volume: 21 ISSN: 0892-7790 ISO Abbreviation: J. Endourol. Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-08-20 Completed Date: 2007-10-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8807503 Medline TA: J Endourol Country: United States |
Other Details:
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Languages: eng Pagination: 780-3 Citation Subset: IM |
Affiliation:
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Department of Urology, University of California-Irvine Medical Center, Orange 92868, California, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Alloys* Animals Female Stents* Swine Swine, Miniature Ureter / physiology* Urodynamics / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Alloys |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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