In a laser surgical equipment consisting of a laser oscillator oscillating a laser output, an optical waveguide connected to the laser oscillator and transmitting the laser output and a hand piece connected to the optical waveguide and radiating the laser output to a diseased part to be radiated, the...http://www.google.se/patents/US4564012?utm_source=gb-gplus-sharePatent US4564012 - Laser surgical equipment
