Blpolar Laser Forceps (双極レーザーピンセット) の開発とその応用

Abstract

A new device attached double flexible optical fibers was designed as a bipolar laser forceps.The distal tips of the forceps which made of metal sheath were angled roundly inward 45 degree and then, the tips were faced to face each other with the angle of 90 degree. An argon laser deliverling 488-514.5nm was used in the present series. The laser beams were transmitted by the laser fiber couplar with two proximal fibers of 200μm in diameter. The laser beam was irradiated onto the tissue from each tip of the fiber in serted in the metal sheath of the for forceps.The methods of tissue fusion with ELF was summarized as the technique using contact laser irradiation under compression onto the narrow point of the aimed tissue. Looking at the fused tissue tiney crater was seen at the both sides of the compressed portion. Using this modality, an experimental tissue fusion was tried on a sacrificed cattle liver, and then the tensile strengths of the fused liver were measured immdiately after laser irradiation in the groups A 200mW, B 300mW and C 500mW. The best strength in this series was achieved as 17.2g on the average, 6.8g/mm2 on the lased area, at the energy of 2 J in group B, while the control groups of non-contact irradiation by BLF under same conditions could be yield no tensile strength. Corresponding to the welded point, the small hole with thermal damage was observed and ascertained shear strength could be gained according to the adjacent tissue with carbonization. It is expected that bipolar laser forceps would be applied to the clinical field in succession to the further experiments.