TY - JOUR
T1 - Systematic Evaluation of Ureteral Occlusion Devices
T2 - Insertion, Deployment, Stone Migration, and Extraction
AU - Ahmed, Mahfuza
AU - Pedro, Renato N.
AU - Kieley, Sam
AU - Akornor, Joseph W.
AU - Durfee, William K
AU - Monga, Manoj
N1 - Funding Information:
Funded through an unrestricted grant from Percys Inc.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/5
Y1 - 2009/5
N2 - Objectives: To compare 4 ureteral occlusion devices in terms of insertion force, maneuverability, radial dilation and extraction forces, ability to prevent stone migration, and tip stiffness. Methods: The devices tested were the PercSys Accordion, Microvasive Stone Cone (7 and 10 mm), and Cook N-Trap. Using a ureteral model with an artificial stone in place, the insertion force, number of attempts, and time to pass the impacted stone were measured. Using a Teflon block model, radial dilation and extraction and axial extraction force were measured with a load cell. Holmium lithotripsy was performed in the ureteral model with a canine stone in place to test the ability of the devices to prevent stone migration. In a similar model, the force applied to retrieve the canine stone was measured. The stiffness of the tip was measured as the force to compress a 5-mm length of the tip in a clamp-clamp configuration on a linear motion stage driven by a stepper motor with a resolution of 8-μm/step. Results: The devices were significantly different statistically from each other in terms of insertion force, number of attempts and time to pass the impacted stone, radial dilation, radial extraction, and axial extraction force in the Teflon block model. No proximal migration of the stones occurred with any of the devices. The devices were similar in terms of preventing proximal stone migration, force applied to retrieve stones, and tip stiffness. Conclusions: The differences in the physical characteristics of stone migration devices might help to predict their safety and efficacy in clinical use.
AB - Objectives: To compare 4 ureteral occlusion devices in terms of insertion force, maneuverability, radial dilation and extraction forces, ability to prevent stone migration, and tip stiffness. Methods: The devices tested were the PercSys Accordion, Microvasive Stone Cone (7 and 10 mm), and Cook N-Trap. Using a ureteral model with an artificial stone in place, the insertion force, number of attempts, and time to pass the impacted stone were measured. Using a Teflon block model, radial dilation and extraction and axial extraction force were measured with a load cell. Holmium lithotripsy was performed in the ureteral model with a canine stone in place to test the ability of the devices to prevent stone migration. In a similar model, the force applied to retrieve the canine stone was measured. The stiffness of the tip was measured as the force to compress a 5-mm length of the tip in a clamp-clamp configuration on a linear motion stage driven by a stepper motor with a resolution of 8-μm/step. Results: The devices were significantly different statistically from each other in terms of insertion force, number of attempts and time to pass the impacted stone, radial dilation, radial extraction, and axial extraction force in the Teflon block model. No proximal migration of the stones occurred with any of the devices. The devices were similar in terms of preventing proximal stone migration, force applied to retrieve stones, and tip stiffness. Conclusions: The differences in the physical characteristics of stone migration devices might help to predict their safety and efficacy in clinical use.
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U2 - 10.1016/j.urology.2008.12.048
DO - 10.1016/j.urology.2008.12.048
M3 - Article
C2 - 19394493
AN - SCOPUS:65249112766
SN - 0090-4295
VL - 73
SP - 976
EP - 980
JO - Urology
JF - Urology
IS - 5
ER -