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A comparative study of guidewire electrical resistance
F Desgrandchamps1, P Pedron, P Hoffmann
1Department of urology, Saint-Louis Hospital, Paris, France.
British Journal of Urology
|October 6, 1997
Summary
Guidewire electrical resistance varies, with sheathed types offering temporary insulation. Abrasion compromises insulation, increasing short circuit risk during endoscopic procedures.
Area of Science:
- Urology
- Medical Devices
- Electrosurgery
Background:
- Guidewires are essential tools in endourology.
- Electrosurgery carries risks, including short circuits.
- Understanding guidewire electrical properties is crucial for patient safety.
Purpose of the Study:
- To assess the electrical resistance of commonly used endourology guidewires.
- To determine the risk of short circuits between active electrodes and guidewires.
- To inform safer electrosurgical practices in endoscopic procedures.
Main Methods:
- Electrical resistance measurements using a standard resistance meter.
- Testing of four guidewire types: stainless-steel, PTFE-painted, PTFE-sheathed, and hydrogel-sheathed.
- Evaluation of new and mechanically abraded guidewires to simulate in-use conditions.
Main Results:
- Pure stainless-steel guidewires exhibited no electrical resistance.
- PTFE-painted guidewires offered poor insulation, easily removed by abrasion.
- New PTFE-sheathed and hydrogel-sheathed guidewires showed safe resistance (>10 KΩ), but insulation degraded with mechanical abrasion.
Conclusions:
- Sheathed guidewires provide initial electrical insulation, but it is not durable.
- Mechanical abrasion significantly compromises guidewire insulation.
- Minimizing electrosurgical risks requires using new, intact sheathed guidewires or ureteric catheters.