Quantitative evaluation of blood flow interception of fetoscopic laser irradiation control

Seki, Takeshi*; Naganawa, Akihiro*; Oka, Kiyoshi; Yamashita, Hiromasa*; Chiba, Toshio*

We developed a new laser device using the composite-type optical fiberscope for laser surgery for twin-twin transfusion syndrome. A composite-type optical fiberscope (2.2 mm in diameter) consists of a centrally located single fiber for laser treatment and its surrounding fibers for diagnosis. This fiberscope enables transmission of 50-W Yb fiber laser. The Yb fiber laser can focus laser to 10 mm focal length using two lenses on tip of the fiberscope. In this paper, we describe the experimental results of temperature control during blood-flow interception of porcine mesenteric venous flow and measure blood flow before and after laser irradiation for evaluation blood flow interception.