小儿输尿管镜中应用不同规格光纤对术区温度的影响

Effect of different holmium laser fiber on regional temperature during lithotripsy with pediatric ureteroscope

本研究构建输尿管嵌顿性结石模型评估小儿输尿管镜使用不同规格钬激光光纤对工作区域温度的影响。WOLF F4.5/6.5小儿输尿管镜灌注压为100 mmHg(1 mmHg=0.133 kPa),分别置入不同规格钬激光光纤,采用不同功率和不同工作时长,结果表明工作区域温度与光纤直径、碎石功率和激光激发时间相关:小儿输尿管镜使用550μm光纤、工作时间>3s,或365μm光纤、工作时间>6 s,局部区域温度都能>42℃,可能会对局部输尿管造成热损伤,导致狭窄。

In order to assess the thermal efeet of dfferent holmium lapser fiber during lithotripsy with WOLF F4.5/6.5 pediatrie ureteroscope,we established an impacted ureter caleuli model.Under 100mmHg irrigation pressure,regional temperature of different holmium laser fiber with varied working time and power were recorded.We found that the regional temperature was related withI aser fiber diameters,power and working time settings.With 550μm laser fiber,laser firing time longer than 3 s or 365μm laser fiber firing more than 6 s.regional temperature exceeded 42℃,which would bring thermal injury towards ureter and subsequently cause ureter stricture.