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Cutting laser systems for ureteral strictures

机译：用于输尿管狭窄的切割激光系统

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Abstract: Acquired ureteral strictures are still treated either with a stent, balloon dilatation, by open surgery or by endoscopic therapy with a `cold knife' or high current density as intubated ureterotomy. The success rates described in the literature range between 50% and 90%. Using the experimental CTH:YAG laser (wavelength 2120 nm) and CT:YAG laser (wavelength 1950 nm), the reduction of invasiveness and of morbidity was evaluated. First, the CTH:YAG laser was investigated on 540 fresh porcine ureters varying the parameters. With a computerized morphometry system, defect depth, defect width, coagulation depth and coagulation width were measured. Then 21 female pigs underwent 7.5 F - 12 F ureteroscopy with CTH:YAG laser, CT:YAG laser, high current density and `cold knife' ureterotomy. An IVP and sacrification with explanation of the whole urinary tract was done on day 6 and around day 60. In practice, laser application via the endoscope was easy to handle and exact cutting was always seen. The CT:YAG laser seems to have the best success results with low ureteral stricture recurrence rates. However, its clinical use remains to be proven. !5
机译：摘要：获得性输尿管狭窄仍可通过支架，球囊扩张术，开放手术或通过“冷刀”或高电流密度的内镜治疗如插管输尿管切开术来治疗。文献中描述的成功率在50％到90％之间。使用实验性CTH：YAG激光（波长2120 nm）和CT：YAG激光（波长1950 nm），评估了侵袭性和发病率的降低。首先，在540个不同参数的新鲜猪输尿管上研究了CTH：YAG激光。使用计算机形态测量系统，测量缺陷深度，缺陷宽度，凝结深度和凝结宽度。然后对21头雌性猪进行CTH：YAG激光，CT：YAG激光，高电流密度和“冷刀”输尿管切开术的7.5 F-12 F输尿管镜检查。在第6天和第60天左右进行了IVP和牺牲，并解释了整个尿路。在实践中，通过内窥镜施加激光很容易处理，并且始终可以看到精确的切割。 CT：YAG激光似乎成功率最高，输尿管狭窄复发率低。但是，其临床用途仍有待证明。 ！5

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