Comparative study of renal drainage with different ureteral stents subject to extrinsic ureteral obstruction using an in vitro ureter-stent model

BMC Urology

Ishai Dror¹  Brian Berkowitz¹  Yaniv Shilo²  Jonathan Modai²  Dan Leibovici² 

[1] Department of Earth and Planetary Sciences, Weizmann Institute of Science, 7610001, Rehovot, Israel;Department of Urology, Kaplan Medical Center, 7661041, Rehovot, Israel;

关键词: Tandem stents;    Metal stents;    Endopyelotomy;    Stent failure;    Colloids;   

DOI  :  10.1186/s12894-021-00865-w

来源: Springer

【 摘 要 】

BackgroundTo compare the efficacy of different ureteral stents subject to extrinsic ureteral obstruction (EUO), in a controlled in vitro stented ureter experiment.MethodsWe employ an in vitro ureter-stent experimental set-up, with latex tubing simulating flexible ureters attached to vessels simulating renal units and bladders. The flow behavior of five ureteral stents—polymeric 8F, tandem 6F, tandem 7F, endopyelotomy and metal—was tested under a ureteral deformation configuration of 40°, with 2000 g external force over a 3.5 cm length of the ureter. A constant fluid flow was applied through the ureter-stent configurations, and pressure fluctuations in the renal unit were monitored. We considered a renal unit pressure of 10 cmH2O or flow discontinuation in the bladder as stent failure. Urine containing debris was mimicked by use of a colloidal solution.ResultsOf all assessed ureteral stents, under EUO conditions, only the single 8F stents remained patent throughout the length of the experiment. All other stents—tandem 6F and 7F, single 7F, metal and endopyelotomy—displayed limitations.ConclusionsTandem and metal stents show no superiority over large luminal polymeric stents for EUO treatment in this in vitro model. Larger luminal stents offer excellent resistance to external pressure and allow adequate colloidal flow. The need for frequent exchange and bladder irritation should also be considered in the choice of stent configuration for treatment of kidney drainage under EUO.

【 授权许可】

CC BY