Application of the Contact Type of Optical Fiber for Gastrointestinal Endoscopy

Abstract

We have studied experimentally and clinically to evaluate the efficacy and safety of the endoscopic VAG laser therapy, and those of the contact type of optical fiber (micro-tip) for the tumors in the gastrointestinal tract. 2 cases of superficial esophageal cancer, 7 cases of early gastric cancer, 22 cases of gastric adenoma, 6 cases of advanced cancer in the esophagus, stomach and colon with stenosis and bleeding were treated with Nd-YAG laser (Medilas). The micro-tip is made of Al₂O₃ and durable, and then able to treat under half of the exposure power less than those of quartz fiber. 5 cases out of 24 cases (15.6%) treated with quartz fiber were appeared residual tumor in course of endoscopic follow-up. The contact laser treatment is possible to cure accurately than the non-contact radiation.