Tissue effects of a newly developed diode pumped pulsed Thulium:YAG laser compared to continuous wave Thulium:YAG and pulsed Holmium:YAG laser

• Published in: World journal of urology Vol. 39; no. 9; pp. 3503 - 3508
• Main Authors: Huusmann, Stephan, Lafos, Marcel, Meyenburg, Ingo, Muschter, Rolf, Teichmann, Heinrich-Otto, Herrmann, Thomas
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2021; Springer Nature B.V
• Subjects: Animals; Experiments; Humans; In Vitro Techniques; Kidney - surgery; Kidneys; Laser radiation; Laser Therapy - methods; Lasers; Lasers, Solid-State - therapeutic use; Medicine; Medicine & Public Health; Nephrology; Oncology; Original; Original Article; Swine; Thulium; Urology; Tissue interaction; Continuous wave Thulium:YAG laser (CW); Holmium:YAG laser; Pulsed Thulium:YAG laser
• ISSN: 0724-4983; 1433-8726
• DOI: 10.1007/s00345-021-03634-4

Purpose The objective of this study is to evaluate the laser-tissue effects of laser radiation emitted by a newly developed high frequency pulsed Tm:YAG laser in comparison to the continuous wave Tm:YAG laser and the pulsed Ho:YAG laser. Methods Ex-vivo experiments were performed on freshly slaughtered porcine kidneys in a physiological saline solution. Experiments were performed using two different laser devices in different settings: A Tm:YAG laser was operated in a pulsed mode up to 300 Hz and in a continuous wave (CW) mode. Results were compared with a 100 W standard pulsed Ho:YAG laser system. Comparative tissue experiments were performed at 5 W, 40 W and 80 W. The incision depth and the laser damage zone were measured under a microscope using a calibrated ocular scale. Results Increased laser power resulted in increased incision depth and increased laser damage zone for all investigated lasers in this set-up. The Ho:YAG created the largest combined tissue effect at the 5 W power setting and seems to be the least controllable laser at low power for soft tissue incisions. The CW Tm:YAG did not incise at all at 5 W, but created the largest laser damage zone. For the new pulsed Tm:YAG laser the tissue effect grew evenly with increasing power. Conclusion Among the investigated laser systems in this setting the pulsed Tm:YAG laser shows the most controllable behavior, insofar as both the incision depth and the laser damage zone increase evenly with increasing laser power.