Load-Release Points of Two Novel Ureteral Stone-Trapping Devices

Ouwenga, Michael; Sharma, SK; Holley, Paulette; Türk, Thomas; Perry, Kent T.

doi:10.1089/end.2005.19.894

Cited by 16 publications

(1 citation statement)

References 6 publications

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“…The two novel devices (Stone Cone and NTrap®) have been previously tested and compared for pull-through strength, which is the force required for each device to deploy and release the beads in a strictured ureter model. Ouwenga et al reported statistically significant but clinically insignificant differences in the releasing force of the two devices [17]. The Stone Cone showed a pull-through strength of 0.190 lbf and the NTrap® device showed a strength of 0.861 lbf, which the group believed was presumably too low to result in ureteral avulsion.…”

Section: Discussionmentioning

confidence: 99%

Use of NTrap® during Ureteroscopic Lithotripsy for Upper Ureteral Stones

Lee

Min

2010

Korean J Urol

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PurposeThis study aimed to determine the value of the NTrap® (Cook Urological INC, USA), which was designed to block the upward movement of stones during ureteroscopic lithotripsy.Materials and MethodsWe reviewed the data of 144 patients who underwent ureteroscopic lithotripsy for an upper ureteral stone from June 2006 to May 2010. Sixty-eight patients who underwent ureteroscopic lithotripsy without the use of the NTrap® were assigned to Group I and 76 patients who underwent ureteroscopic lithotripsy with the NTrap® were assigned to Group II. The size of the stones, operation time, success rate, and pre- and postoperative complications were compared retrospectively between the two groups.ResultsThe mean age of the patients (Group I: 35.8 years; Group II: 32.6 years) and the sex ratios were not significantly different between the two groups. The mean size of the stones was 6.9 mm and 7.4 mm, which also was not significantly different between the two groups. The mean operation time was 82.7 minutes and 78.7 minutes. The operation time was shorter in Group II, but the difference was not significant. The success rate of stone removal was 89.7% and 98.7% in Groups I and II, respectively; Group II showed a significantly higher success rate. Two cases of ureteral perforation and one case of ureteral avulsion occurred in Group I, and one case of ureteral perforation occurred in Group II.ConclusionsNTrap®, which is an instrument used to assist during ureteroscopic lithotripsy, can be considered to be an effective tool that blocks the upward movement of the stone and aids in safe stone removal.

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Section: Discussionmentioning

confidence: 99%