Abstract
Non-contact irradiation of Nd-YAG laser is sometimes difficult to keep a constant distance between the tip of the quartz fiber and the lesion. On these cases, the contact type of endoprobe is useful which is made of Al2O3 (artificial sapphire).
Because this probe is very expensive, we develop a new type of endoprobe which is made of polyacetal (-(CH2-O)n-). Its shape is similar to that of the temple bell. The inside of the endoprobe being in contact with the lesion is filled with the water and through it Nd-YAG laser beam is irradiated. On this study we examined histologically the effects of Nd-YAG laser on the gastric mucosa of the dog by using this new endoprobe. Even at 30 Watts the degenerative area by weak contact irradiation was not yet beyond the submucosal layer. On the other hand, the degeneration extended to the serosa by strongly pushing irradiation for 2 seconds at 20 Watts.
