Division of Urologic Surgery, Geneva University Hospital and Medical Faculty, University Geneva, Geneva.
BJU Int. 2011 Jun;107(12):1938-42. doi: 10.1111/j.1464-410X.2010.09760.x. Epub 2010 Oct 29.
• To assess the residual power delivered at the tip of a high-power (80 W) potassium-titanyl-phosphate (KTP) laser (80 W Green Light PV(TM), Laserscope(®); American Medical Systems, Minnetonka, MN, USA) at the end of a photoselective vaporization of the prostate (PVP) procedure, as well as the deflection angle of the laser beam.
• In total, 65 laser fibres were collected at the end of PVP procedures indicated for symptomatic benign prostatic hyperplasia over a period of 17 months. PVP was performed by two senior urologists. • The power of laser beam at tip exit was measured for each fibre at the end of the procedures using a photodiode whose signal was amplified, and then quantified by a volt multimeter. • The deflection angle was measured using a graduated sphere.
• Approximately 70% of fibres delivered less than 40 W at the end of the procedure, which is less than the vaporization threshold. • Some 9% of fibres had lost their diffraction capacity with a significant alteration of laser beam angulation. These values were not operator dependent.
• The data show that a large proportion of laser fibers deliver a significantly underpowered beam at the end of the procedures. • This seems to be caused by peroperative destruction of the fibers, which results in a progressive loss of efficacy of PVP during procedures.
评估在前列腺光汽化术（PVP）结束时，大功率（80 W）的钕钛宝石（KTP）激光（80 W 绿光 PV（TM），Laserscope（®）；美国医学系统公司，明尼苏达州米尼奥拉）在尖端处输送的剩余功率，以及激光束的偏转角。
在 17 个月的时间里，共收集了 65 根在治疗有症状的良性前列腺增生的 PVP 手术后末端的激光光纤。PVP 由两位资深泌尿科医生进行。在手术结束时，使用光电二极管测量每根光纤末端的激光束功率，光电二极管的信号被放大，然后通过伏特计进行量化。使用分度球测量偏转角。
大约 70%的光纤在手术结束时输送的功率小于 40 W，低于汽化阈值。约 9%的光纤失去了其衍射能力，激光束的角度发生了显著改变。这些值与操作人员无关。
数据表明，在手术结束时，很大一部分光纤输送的光束功率明显不足。这似乎是由于术中光纤的破坏导致 PVP 在手术过程中的疗效逐渐丧失。
