Objective Assessment of Working Tool Impact on Irrigation Flow and Visibility in Flexible Ureterorenoscopes

Bach, Thorsten; Netsch, Christopher; Herrmann, Thomas; Gross, Andreas J.

doi:10.1089/end.2010.0739

Cited by 21 publications

(5 citation statements)

References 11 publications

(18 reference statements)

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“…For example, the highest possible LithoVue curvature corresponds to only a 5% decrease in flow rate compared with that of a straight scope. This confirms observations from previous studies, 3,4,8 while providing a theoretical underpinning.…”

Section: Resultssupporting

confidence: 91%

The Fluid Mechanics of Ureteroscope Irrigation

Williams

Turney

Rauniyar

et al. 2019

Journal of Endourology

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Purpose: To develop a physical understanding of ureterorenoscopy irrigation, we derive mathematical models from basic physical principles and compare these predictions with the results of benchtop experiments. Mathematical modeling can be used to understand the role of inlet pressure, tip deflection, the presence of working tools, geometric properties of the instruments used, and material properties of the irrigation fluid on resulting flow rate.Materials and Methods: We develop theoretical models to describe irrigation flow in an idealized setup and compare with benchtop experiments for flow through a straight scope, a scope with a deflected tip, and a scope with a working tool inserted. The benchtop experiments were performed using Boston Scientific LithoVue ureteroscope and a variety of Boston Scientific working tools. Standard ureteroscope working channels have circular cross sections, but using theoretical models we investigate whether modifications to the cross-sectional geometry can enhance flow rates.Results: The theoretical flow predictions are confirmed by experimental results. Tip deflection is shown to have a negligible effect on flow rate, but the presence of working tools decreases flow significantly (for a fixed driving pressure). Flow rate is predicted to improve when tools are placed at the edge of the channel, rather than the center, and modifying the cross-sectional shape from a circle to an ellipse can further increase flow rate.Conclusions: A mathematical framework is formulated and shown to accurately predict the properties of ureteroscope irrigation flow. The theoretical approach has significant potential in quantifying irrigation flow and improving ureteroscope design.

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Section: Resultssupporting

confidence: 91%

The Fluid Mechanics of Ureteroscope Irrigation

Williams

Turney

Rauniyar

et al. 2019

Journal of Endourology

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“…9 only online) [35 && ]. Recently a two-channel-endoscope is available with digital technology (Cobra-HD, Richard Wolf) [36].…”

Section: Digital Endoscopesmentioning

confidence: 99%

New technology in ureteroscopy and percutaneous nephrolithotomy

Rassweiler

Klein

2016

Current Opinion in Urology

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“…In these situations, the second working channel, as shown in our results, can achieve a superior and continuous irrigation capability. A recent study by Bach et al, 8 who examined the time needed by different ureteroscopes to restore light transmission in a 2% ink solution, supported these findings by showing a significant shorter light transmission restoring time for the Wolf Cobra. Participants in our in vivo ureteroscopic evaluation deemed the Wolf Cobra superior in performance in a standardized bloody solution due to the significantly faster ability to clear the vision.…”

Section: Technical Specificationsmentioning

confidence: 87%