In vitro experimental study on the temperature variation around super-pulse fiber of thulium fiber laser lithotripsy with Needle-perc
Objective:To investigate the temperature changes around the fiber during the Needle-perc ultra-pulse fiber thulium laser lithotripsy.Methods:Using an in vitro kidney stone model,a single doctor performed Needle-perc laser lithotripsy,and two temperature probes were placed 2 mm on both sides of the laser fiber for re-al-time detection and recording.The laboratory temperature was maintained at around 25 ℃.The irrigation fluid was normal saline at a temperature of around 22 ℃.Irrigation flow rates were 0,25,50,and 100 mL/min.Lith-otripsy power was set at 8,10,12,and 15 W,and parameter combinations were"high energy low frequency"mode and"high frequency low energy"mode.The excitation mode was intermittent excitation:excitation for 15 s,intermittent for 5 s,and the experimental period for each group was 120 s;continuous excitation:continu-ous excitation for 120 s.Each group of experiments was repeated 10 times,and the temperature recorder recorded the temperature in real time.Results:If the lithotripsy power was 8,10,12,and 15 W and the irrigation flow rate was 0 mL/min,the time for the temperature to exceed the safety threshold in the continuous excitation mode was 23,18,13,and 9 s,respectively,and in the intermittent excitation mode,it was 30,24,13,and 9 s,re-spectively.If the irrigation flow rate was 25,50,and 100 mL/min,no matter which excitation mode was used,the temperature did not exceed the safety threshold.If the lithotripsy power was 8,10,12,and 15 W and the irri-gation flow rate was 25 mL/min,the temperature change value in the"high frequency low energy"mode was higher than that in the"high energy low frequency"mode.The difference was statistically significant(P＜0.05).If the lithotripsy power was 8,10,12,and 15 W and the irrigation flow rate was 25 mL/min,the temperature change value in the continuous excitation mode was higher than that in the intermittent excitation mode.The difference was statistically significant(P＜0.05).Conclusion:During the Needle-perc super-pulse fiber thulium la-ser lithotripsy,the temperature change value in the continuous excitation mode is higher than that in the intermit-tent excitation mode,and the temperature change value in the"high frequency low energy"parameter combination is higher than that in the"high energy low frequency"parameter combination.However,if the lithotripsy power is ≤15 W and the irrigation flow rate is ≥25 mL/min,no matter which excitation mode or parameter combination is used,the temperature around the laser fiber is safe and reliable.
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