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

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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 (pav up to 100 W, Lumenis, Yokneam, Israel) and a superpulse Tm-fiber laser (SP TFL, pav 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 pav 8 W). Power meter FieldMaxII-TO (Coherent, Santa Clara, CA, USA) was used to verify output laser power (pav). 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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Acknowledgements

The authors wish to thank Anastasia Kovalenko and Ekaterina Startseva for help in conducting the experiments.

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Authors and Affiliations

  1. Institute for Urology and Reproductive Health, Sechenov University, 2/1 Bolshaya Pirogovskaya St., Moscow, 119991, Russia

    Mark Taratkin, Ekaterina Laukhtina, Abdusalam Abdusalamov, Stanislav Ali, Tatyana Alekseeva & Dmitry Enikeev

  2. UT Southwestern Medical Center, Dallas, TX, USA

    Nirmish Singla

  3. Department of Public Health and Healthcare Organization, Sechenov University, Moscow, Russia

    Vasily Kozlov

  4. Institute of Linguistics and Intercultural Communication, Sechenov University, Moscow, Russia

    Svetlana Gabdullina

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  1. Mark Taratkin
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  2. Ekaterina Laukhtina
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  3. Nirmish Singla
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  4. Vasily Kozlov
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  5. Abdusalam Abdusalamov
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  6. Stanislav Ali
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  9. Dmitry Enikeev
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Contributions

MT: manuscript writing; project development; data collection; EL: manuscript writing; data collection; NS: manuscript editing; VK: data analysis; AA: data analysis; SG: data collection; SA: data collection; TA: manuscript editing; DE: manuscript editing; protocol development.

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Correspondence to Mark Taratkin.

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Taratkin, M., Laukhtina, E., Singla, N. et al. Temperature changes during laser lithotripsy with Ho:YAG laser and novel Tm-fiber laser: a comparative in-vitro study. World J Urol 38, 3261–3266 (2020). https://doi.org/10.1007/s00345-020-03122-1

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