Department of Urology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, 641-0012, Japan.
Department of Oral and Maxillofacial Surgery, Wakayama Medical University, Wakayama, Japan.
Urolithiasis. 2022 Aug;50(4):493-499. doi: 10.1007/s00240-022-01335-0. Epub 2022 Jun 7.
This study aimed to evaluate stone retropulsion in various laser pulse modes in both Moses mode (MM) and virtual basket mode (VBM). Experiments were performed using a channel-shaped rubber rail and artificial stones. We compared short pulse mode and long pulse mode in both MM and VBM with the laser tip positioned so that it was touching and at 1 and 2 mm distances from the stone surface. Stone retropulsion was measured after the laser fired for 10 s in three different laser settings: 0.5 J/8 Hz, 0.8 J/8 Hz and 1.0 J/8 Hz. When the laser tip was touching the artificial stone, stone retropulsion in MM was significantly shorter than that in VBM in all laser settings (P < 0.01, P = 0.02 and P = 0.02, respectively). At 1-mm distance, stone retropulsion in MM was significantly shorter than that in VBM in 0.8 J/8 Hz and 1.0 J/8 Hz settings (P < 0.01 and P = 0.01, respectively). At 2-mm distance, however, there were no differences between MM and VBM in stone retropulsion in any laser settings. Stone retropulsion was not significantly different between the laser settings at 1-mm distance in MM, or when touching in VBM. In conclusion, stone retropulsion distance in MM can be shorter than that in VBM. Stone retropulsion in MM and VBM may be differently influenced by laser settings and laser tip position.
本研究旨在评估摩西模式（MM）和虚拟篮式模式（VBM）下不同激光脉冲模式中的结石后退情况。实验使用槽形橡胶轨和人造结石进行。我们比较了 MM 和 VBM 中的短脉冲模式和长脉冲模式，激光尖端的位置分别为接触和距离结石表面 1 和 2 毫米。在三种不同的激光设置（0.5 J/8 Hz、0.8 J/8 Hz 和 1.0 J/8 Hz）下，激光发射 10 秒后测量结石后退距离。当激光尖端接触人造结石时，在所有激光设置下，MM 中的结石后退距离明显短于 VBM（P < 0.01，P = 0.02 和 P = 0.02）。在 1 毫米距离时，在 0.8 J/8 Hz 和 1.0 J/8 Hz 两种激光设置下，MM 中的结石后退距离明显短于 VBM（P < 0.01 和 P = 0.01）。然而，在 2 毫米距离时，在任何激光设置下，MM 和 VBM 之间的结石后退距离没有差异。在 MM 中，1 毫米距离处的激光设置之间，或 VBM 中接触时，结石后退距离没有显著差异。总之，MM 中的结石后退距离可以短于 VBM。MM 和 VBM 中的结石后退可能会受到激光设置和激光尖端位置的不同影响。
