Application of the Argon Laser in Neurosurgery

Abstract

An argon ion surgical laser system (Model 770 AMPL, Cooper Medical Corporation, Mountain View, California) has been used in our department since 1981. This laser operates in the blue-green portion of the visible spectrum between 488 and 514.5 nm; approximately 80% of the power output is available at these wavelengths. The laser is coupled to the operating microscope via a fiberoptic micromanipulator delivery system. Transmission through the fiberoptic cables results in a rather homogeneous distribution of energy within the laser beam. The direction and spot size of the beam are controlled, respectively, by a “joy stick” and a focus knob on the micromanipulator. The joy stick can decrease physiological tremor by a factor of 20:1. The laser beam spot size can be continuously varied between 0.15 and 1.5 mm. The power output, pulse duration and repetition rate of the laser are controlled from the console.