A Dual-Channel Flexible Ureteroscope: Evaluation of Deflection, Flow, Illumination, and Optics

Abstract

The dual-channel flexible ureteroscope provides similar deflection characteristics to the current single-channel scope. Deflection and flow characteristics are superior, however, when larger or multiple simultaneous instruments are used in the working channel. These benefits may facilitate the development and implementation of novel endoscopic procedures.

Comparison of Optics and Performance of Single Channel and a Novel Dual-channel Fiberoptic Ureteroscope

“…In our study, the dualeworking channel ureteroscope showed equal to superior maximum downward and upward deflection compared with the singleeworking channel ureteroscopes with empty and with various instruments present in the working channel. These findings were supported by a study of Habermann et al, 6 who compared the Wolf Cobra to a singleeworking channel ureteroscope, the Wolf Viper. Because of a reduced maximum deflection angle for the upward deflection (maximum 180 ), the SD-DS presents diminished upward deflection capabilities.…”

“…6,7 The distal sensor ureteroscope (SD-DS) revealed superior results regarding resolution, color representation, and depth of field. Among the fiberoptic ureteroscopes, the Wolf Cobra showed the highest resolution, depth of field, and a superior illumination.…”

“…Several studies have demonstrated diminishment in flow by the presence of instruments in the working channel. 6 Because of the presence of the second working channel (both working channels connected to the irrigation system), the Wolf Cobra showed superior flow with an empty working channel and with various accessories compared with the single working channel ureteroscopes. Despite the identical diameter of both working channels (3.3 Fr), we noted for the longer working channel (laser fiber enhancement channel located closer to handle) a slightly diminished flow (36 cc/min) compared with the more caudal located working channel (40 cc/min).…”

In vitro, in vivo, and clinical tests of a novel flexible ureteroscope for the diagnosis and treatment of kidney and ureteral diseases

“…The irrigation fluid flow rate also considerably contributes to stone visualizations, which is critical for successful RIRSs [12]. However, our current model showed deterioration of visual fields with worse irrigation.…”

Instrumentation in endourology

“…Haberman compared the Wolf Cobra dual-channel (3.3 Fr each) ureteroscope to the Wolf Viper single channel (3.6 Fr) scope [Haberman et al 2010]. They noted that the dual-channel scope provided superior flow and deflection when larger instruments were deployed.…”