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20.02.2020 | Original Article

Temperature changes during laser lithotripsy with Ho:YAG laser and novel Tm-fiber laser: a comparative in-vitro study

verfasst von: Mark Taratkin, Ekaterina Laukhtina, Nirmish Singla, Vasily Kozlov, Abdusalam Abdusalamov, Stanislav Ali, Svetlana Gabdullina, Tatyana Alekseeva, Dmitry Enikeev

Erschienen in: World Journal of Urology | Ausgabe 12/2020

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Abstract

Aim

The aim of this study was to compare the thermal effects of Ho:YAG and Tm-fiber lasers during lithotripsy in an in-vitro model via real-time temperature measurement.

Methods

We compared a Ho:YAG laser (p_av up to 100 W, Lumenis, Yokneam, Israel) and a superpulse Tm-fiber laser (SP TFL, p_av up to 40 W, NTO IRE-Polus, Fryazino, Russia), both equipped with 200 µm bare-ended fibers. The following settings were used: 0.2 J, 40 Hz (nominal p_av 8 W). Power meter FieldMaxII-TO (Coherent, Santa Clara, CA, USA) was used to verify output laser power (p_av). Each laser was fired for 60 s in two setups: (1) thermos-insulated (quasi-adiabatic) cuvette; (2) actively irrigated setup with precise flow control (irrigation rates 0, 10, 35 mL/min).

Results

Power measurements performed before the test revealed a 10% power drop in Ho:YAG (up to 7.2 ± 0.1 W) and 6.25% power drop in SP TFL (up to 7.5 ± 0.1). At the second step of our experiment, irrigation reduced the respective temperatures in the same manner for both lasers (e.g., at 35 mL/s SP TFL − 1.9 °C; for Ho:YAG laser − 2.8 °C at 60 s).

Conclusion

SP TFL and Ho:YAG lasers are not different in terms of volume-averaged temperature increase when the same settings are used in both lasers. Local temperature rises may fluctuate to some degree and differ for the two lasers due to varying jet streaming caused by non-uniform heating of the aqueous medium by laser light.

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Titel: Temperature changes during laser lithotripsy with Ho:YAG laser and novel Tm-fiber laser: a comparative in-vitro study
verfasst von: Mark Taratkin
Ekaterina Laukhtina
Nirmish Singla
Vasily Kozlov
Abdusalam Abdusalamov
Stanislav Ali
Svetlana Gabdullina
Tatyana Alekseeva
Dmitry Enikeev
Publikationsdatum: 20.02.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: World Journal of Urology / Ausgabe 12/2020
Print ISSN: 0724-4983
Elektronische ISSN: 1433-8726
DOI: https://doi.org/10.1007/s00345-020-03122-1

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Temperature changes during laser lithotripsy with Ho:YAG laser and novel Tm-fiber laser: a comparative in-vitro study

Abstract