Mechanism of Ureteral Stent Flow: A Comparative <i>in Vivo</i> Study

Brewer, Allison V.; Elbahnasy, Abdelhamid M.; Bercowsky, Eduardo; Maxwell, Keegan L.; Shalhav, A. L.; Kahn, Scott A.; McDougall, Elspeth M.; Clayman, Ralph V.

doi:10.1089/end.1999.13.269

Cited by 55 publications

(23 citation statements)

References 5 publications

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“…Recently, prototypes of spiral and mesh shape stents have been tested to improve urine¯ow. Brewer et al [3] analyzed mechanisms of ureteral¯ow in an animal model, concluding that the¯ow depends on the internal diameter of the stent and the greatest¯ow is achieved with a prototype mesh stent. For cases of ureteric obstruction which are impossible to relieve transluminally, extra-anatomic stents have been tested in preliminary and selected clinical cases with promising results [20,35,39].…”

Section: Design Shape And¯ow Studiesmentioning

confidence: 99%

Advances in ureteral stent technology

Denstedt¹,

Reid

Sofer³

2000

World J Urol

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This review focuses on technological advances and relevant research related to ureteral stents. The importance of physical and chemical biomaterial type, biocompatibility, material coatings such as hydrogels, and infection related to indwelling ureteral stents are discussed. Recent in vitro and in vivo research has focused on materials that will reduce encrustation and bacterial biofilm formation. The adsorption of antimicrobials onto devices holds promise of reducing infection rates, but multidrug resistant bacteria, short leaching times and adverse side effects make it essential that alternative strategies be investigated. Just so, encrustation limits the long-term use of urinary materials, and a better understanding of factors involved in encrustation are needed to reduce the problem.

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Section: Design Shape And¯ow Studiesmentioning

confidence: 99%

Advances in ureteral stent technology

Denstedt¹,

Reid

Sofer³

2000

World J Urol

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“…It is not clear as to whether the stent diameter has any eVect on VUR. In a porcine model, increased intraluminal stent diameters showed increased Xows, with a maximum Xow occurring at 7 Fr [14]. However, no diVerence in VUR was observed in other groups using diVerent stent diameters or lengths [15].…”

Section: Discussionmentioning

confidence: 85%

Initial experience with a newly developed antirefluxive ureter stent

et al. 2011

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The objective of this study was to assess the functional efficacy of newly developed antirefluxive ureter stents (DJ), by performing immediate post-stenting cystograms on patients with acute ureteral obstruction requiring a DJ stent, and assessing stent-related symptoms by means of ureteral stent symptoms questionnaire (USSQ). Patients with acute hydronephrosis requiring internal drainage were randomized to receive either an antirefluxive DJ or a conventional DJ (7 Fr., 26 cm, polyurethane, Urovision(®), Germany). Mean stone size was 6.64 ± 3.33 and 6.5 ± 3.54 mm. Immediately after correct placement of the DJ, 200 ml of diluted contrast media was introduced into the bladder under fluoroscopic control to detect vesicoureteral reflux (VUR). Patients completed German versions of the USSQ on days 2 and 7 following stent placement, and 1 week after stent removal. The results were analyzed. 13 conventional and 16 antirefluxive stents were placed in 29 patients. Reflux was documented in eight conventionally stented patients (62.5%). Two of the 16 patients with antirefluxive stents (22%) presented reflux. 1 week after stent implantation, the mean pain value was 1.1 in the antirefluxive group and 3 in the standard group (p < 0.062). Flank pain during micturition occurred after 2 days in seven patients (58%) with standard stents and in three patients (33%) with antirefluxive stents (p < 0.23). 1 week after stent insertion, flank pain had dropped to 40% in the standard group and 11% in the antirefluxive group (p < 0.3). Our initial experience showed that the antirefluxive system might be effective in terms of reflux prevention and reduction of stent related symptoms especially during sexual intercourse.

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“…It seems that stents, even when intraluminal flow is decreased, may continue to function through their extraluminal flow. 20 Eight patients had their stents removed, and six of them have stable renal function without obstruction (success rate 75%). Success rates range from 39% to 70% in other series where the stent is inserted for 3 months.…”

Section: Discussionmentioning

confidence: 97%