Systematic evaluation of ureteral occlusion devices: insertion, deployment, stone migration, and extraction
Mahfuza Ahmed1, Renato N Pedro, Sam Kieley
1Department of Biomedical Engineering, University of Minnesota Medical Center, Minneapolis, Minnesota 55455, USA.
Urology
|April 28, 2009
Summary
Four ureteral occlusion devices were compared for insertion force and stone migration prevention. While all devices prevented stone migration, significant differences existed in insertion and extraction forces, influencing clinical safety and efficacy predictions.
Area of Science:
- Urology
- Medical Device Engineering
- Nephrology
Background:
- Ureteral occlusion devices are crucial for preventing stone migration during procedures.
- Understanding the physical characteristics of these devices is essential for optimizing patient outcomes.
Purpose of the Study:
- To comparatively evaluate four ureteral occlusion devices.
- Assess insertion force, maneuverability, radial dilation, extraction forces, stone migration prevention, and tip stiffness.
Main Methods:
- Utilized a ureteral model with artificial and canine stones to measure insertion and extraction forces.
- Employed a Teflon block model for radial dilation and extraction force measurements.
- Assessed stone migration prevention during Holmium lithotripsy and measured tip stiffness.
Main Results:
- Statistically significant differences were observed among devices in insertion force, stone passage time, radial dilation, and extraction forces.
- All tested devices effectively prevented proximal stone migration.
- No significant differences were found in the force required to retrieve stones or in tip stiffness.
Conclusions:
- Physical characteristics of ureteral occlusion devices vary significantly.
- These variations may aid in predicting the safety and clinical efficacy of different devices.
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