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

Table 1 Time to stent failure (blockage), in hours, under deformation of 40° and compression of 2000 g in the region of the external ureteral obstruction

Replicate	Stent
Replicate	Tandem 6F (time to blockage, hour)	Tandem 7F (time to blockage, hour)	Resonance^® (time to blockage, hour)	Endopyelotomy 14F (time to blockage, hour)	8F^† (time to blockage, hour)
1	132	133.5	243.5	300.5	–^‡
2	274	103	124.5	235.5	–^‡
3	325	329	224
4	–^‡	303.5	–^‡

Entries with “–” indicate no failure. All failure times are rounded to the nearest half hour
^†The same result (no blockage) for 4 similar replicates with the 8F stent was reported in [18]
^‡Experiment duration of 348 h

ISSN: 1471-2490