抄録
To treat the widely spreading cutaneous lesions, we propose a new laser transmission system, named Fiber Bundle Scanner (FBS), which produces a wide angle irradiation over the skin surface. In this section, the size of one irradiated hexagonal close-packed pattern (multispots) and the arrangement of these multispots were clinically investigated. When 5.0 watts power was used, the pulse duration was 0.14 seconds and the distance from the exit end of a fiber to the lesion was 35mm., the power density over the lesion was 400 mW/mm2. In this condition, the size of a single spot was about 4mm. in diameter with a graded index type of quartz fiber of 0.4 mm.. The suitable size of one multispots was about 11 mm. in diameter with this FBS. To get uniformly irradiated result, the appropriate distance betweenthe centers of these multispots was 7 mm. at above these conditions.
Clinically, 71 cases with port wine stains were treated,by the FBS (graded index type). The progress reports of typically treated 3 cases were demonstrated.
Recently a new FBS using step index type fibers (SIF) was developed. The output laser spot from the SIF has a flat peak of of irradiance profile. Therefore, this scanner using SIF makes it easy and fast to irradiate the aimed lesion uniformly on the widely spreading lesions.
