Tissue Dissection using a 1470-nm Diode Laser and Laparoscopic Prototype

摘要

A continuous-wave, 40 Watt, 1470 nm laser was explored for rapid and precise dissection of porcine mesentery fascia and liver tissues, ex vivo. Laser energy was delivered through a 550-μm-core optical fiber inside a 5-mm-OD, laparoscopic probe, with detachable, 2 mm, sapphire ball rolling tip. Fascia tissue was cleanly dissected with scanning rates from 2.0 - 4.5 mm/s using 16 - 31W. Fascia collateral thermal damage measured as low as 180 ± 50 μm at 4.5 mm/s scan speed. Porcine liver ablation crater depth measured up to 1010 ± 220 μm with 30 W at 2.0 mm/s or as shallow as 80 ± 30 μm with 10 W at 10 mm/s. Peak temperatures reached 130 ℃ at ball tip and 75 ℃ on metal jaws. The 1470-nm laser and probe show promise for laparoscopic tissue cutting and coagulation.