| Mechanism of ureteral stent flow: a comparative in vivo study. | |
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MedLine Citation:
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PMID: 10405904 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND AND OBJECTIVES: The flow characteristics of ureteral stents have yet to be clearly defined. In this study, flow mechanics were studied in several silicone-based stents including 4.8F, 7F, and 10.3F pigtail; 7F Tower; and a prototype mesh stent. MATERIALS AND METHODS: Forty-five female Yucatan minipigs underwent bilateral laparoscopic occlusion of their renal vessels to stop urine production. A nephrostomy tract was established by retrograde puncture. A stent was placed in the ureter, and three measurements were taken with flow from a bag of irrigant 20 cm above the kidney: stent occluded with a guidewire (extraluminal flow), stent unobstructed (total flow), and laparoscopically placed extraureteral ligature (luminal flow). RESULTS: Luminal flow and, to a lesser extent, total flow appeared to increase as the internal and external diameters of the stent increased. The Tower stent, which had no sideholes, had much lower flow rates in all categories, while the prototype mesh stent showed greater total flow compared with the other stents. Extraluminal flow did not increase with stent size greater than 7F. CONCLUSIONS: Luminal flow, but not extraluminal flow, increased with an increase in the internal diameter of the stent. In general, the least favorable flow occurred with a Tower stent, which had the smallest internal diameter. The greatest flow was seen with the prototype mesh stent. |
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Authors:
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A V Brewer; A M Elbahnasy; E Bercowsky; K L Maxwell; A L Shalhav; S A Kahn; E M McDougall; R V Clayman |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of endourology / Endourological Society Volume: 13 ISSN: 0892-7790 ISO Abbreviation: J. Endourol. Publication Date: 1999 May |
Date Detail:
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Created Date: 1999-09-13 Completed Date: 1999-09-13 Revised Date: 2006-11-15 |
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: 269-71 Citation Subset: IM |
Affiliation:
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Division of Urologic Surgery, Washington University Medical School, St. Louis, Missouri, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biocompatible Materials* Disease Models, Animal Female Male Silicones* Stents* Swine Swine, Miniature Ureteral Obstruction / diagnosis, physiopathology*, surgery Ureteroscopy Urodynamics* Urography |
| Chemical | |
Reg. No./Substance:
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0/Biocompatible Materials; 0/Silicones |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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