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Ho:YAG laser lithotripsy in non-contact mode: optimization of fiber to stone working distance to improve ablation efficiency.
World J Urol. 2019 Sep; 37(9):1933-1939.WJ

Abstract

PURPOSE

To evaluate how variable working distances between the laser fiber and the stone influence ablation volume.

METHODS

A laser fiber was fixed on a robotic arm perpendicular to an artificial stone. A single laser pulse was triggered at different working distances (0-2.0 mm in 0.2 mm increments) between the distal fiber tip and the stone. To achieve a measurable impact, pulse energy was set to 2 and 3 J, with either short or long pulse duration. Ablation volume was calculated with an optical microscope. Experiments were repeated five times for each setting.

RESULTS

Highest ablation volume was observed with a long pulse of 3 J at a working distance of 0.4 mm between the laser fiber and the stone surface (p value < 0.05). At 2 J, the highest ablation volume was noticed with a short pulse in contact mode. However, ablation volume of the latter was not significantly greater than with a long pulse of 2 J at a working distance of 0.4 mm (p value > 0.05). Compared to lithotripsy in contact mode, triggering a single long pulse at 0.4 mm increased ablation volume by 81% (p value = 0.016) at 2 J and by 89% (p value = 0.034) at 3 J.

CONCLUSIONS

For Ho:YAG laser lithotripsy, ablation volume may be higher in non-contact mode using long pulses, rather than in direct contact to the stone. Findings of the current study support the need of further studies of lithotripsy in non-contact mode.

Authors+Show Affiliations

Sorbonne Université, GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, AP-HP, Hôpital Tenon, 75020, Paris, France. Department of Urology, AZ Klina, Brasschaat, Belgium.Sorbonne Université, GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, AP-HP, Hôpital Tenon, 75020, Paris, France. Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.Sorbonne Université, GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, AP-HP, Hôpital Tenon, 75020, Paris, France.Department of Urology, University of Medicine and Pharmacy "Victor Babes" Timişoara, Timisoara, Romania.Fundació Puigvert, Department of Urology, Universidad Autonoma de Barcelona, Barcelona, Spain.Sorbonne Université, GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, AP-HP, Hôpital Tenon, 75020, Paris, France.Process and Engineering in Mechanics and Materials Laboratory (PIMM), UMR CNRS/ENSAM, Paris, France.Sorbonne Université, GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, AP-HP, Hôpital Tenon, 75020, Paris, France. olivier.traxer@aphp.fr.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30511211

Citation

De Coninck, Vincent, et al. "Ho:YAG Laser Lithotripsy in Non-contact Mode: Optimization of Fiber to Stone Working Distance to Improve Ablation Efficiency." World Journal of Urology, vol. 37, no. 9, 2019, pp. 1933-1939.
De Coninck V, Keller EX, Chiron P, et al. Ho:YAG laser lithotripsy in non-contact mode: optimization of fiber to stone working distance to improve ablation efficiency. World J Urol. 2019;37(9):1933-1939.
De Coninck, V., Keller, E. X., Chiron, P., Dragos, L., Emiliani, E., Doizi, S., Berthe, L., & Traxer, O. (2019). Ho:YAG laser lithotripsy in non-contact mode: optimization of fiber to stone working distance to improve ablation efficiency. World Journal of Urology, 37(9), 1933-1939. https://doi.org/10.1007/s00345-018-2589-8
De Coninck V, et al. Ho:YAG Laser Lithotripsy in Non-contact Mode: Optimization of Fiber to Stone Working Distance to Improve Ablation Efficiency. World J Urol. 2019;37(9):1933-1939. PubMed PMID: 30511211.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ho:YAG laser lithotripsy in non-contact mode: optimization of fiber to stone working distance to improve ablation efficiency. AU - De Coninck,Vincent, AU - Keller,Etienne Xavier, AU - Chiron,Paul, AU - Dragos,Laurian, AU - Emiliani,Esteban, AU - Doizi,Steeve, AU - Berthe,Laurent, AU - Traxer,Olivier, Y1 - 2018/12/03/ PY - 2018/09/26/received PY - 2018/11/28/accepted PY - 2018/12/5/pubmed PY - 2020/2/19/medline PY - 2018/12/5/entrez KW - Distance KW - Ho:YAG KW - Laser KW - Nephrolithiasis KW - Non-contact SP - 1933 EP - 1939 JF - World journal of urology JO - World J Urol VL - 37 IS - 9 N2 - PURPOSE: To evaluate how variable working distances between the laser fiber and the stone influence ablation volume. METHODS: A laser fiber was fixed on a robotic arm perpendicular to an artificial stone. A single laser pulse was triggered at different working distances (0-2.0 mm in 0.2 mm increments) between the distal fiber tip and the stone. To achieve a measurable impact, pulse energy was set to 2 and 3 J, with either short or long pulse duration. Ablation volume was calculated with an optical microscope. Experiments were repeated five times for each setting. RESULTS: Highest ablation volume was observed with a long pulse of 3 J at a working distance of 0.4 mm between the laser fiber and the stone surface (p value < 0.05). At 2 J, the highest ablation volume was noticed with a short pulse in contact mode. However, ablation volume of the latter was not significantly greater than with a long pulse of 2 J at a working distance of 0.4 mm (p value > 0.05). Compared to lithotripsy in contact mode, triggering a single long pulse at 0.4 mm increased ablation volume by 81% (p value = 0.016) at 2 J and by 89% (p value = 0.034) at 3 J. CONCLUSIONS: For Ho:YAG laser lithotripsy, ablation volume may be higher in non-contact mode using long pulses, rather than in direct contact to the stone. Findings of the current study support the need of further studies of lithotripsy in non-contact mode. SN - 1433-8726 UR - https://www.unboundmedicine.com/medline/citation/30511211/Ho:YAG_laser_lithotripsy_in_non_contact_mode:_optimization_of_fiber_to_stone_working_distance_to_improve_ablation_efficiency_ L2 - https://dx.doi.org/10.1007/s00345-018-2589-8 DB - PRIME DP - Unbound Medicine ER -