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Proceedings Paper

Characterization of micromanipulators for CO2 laser surgery in head and neck: comparison of reflective and refractive optical systems
Author(s): Kenneth K. H. Chao; Eric Cheung; William B. Armstrong; Brian Jet-Fei Wong
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Paper Abstract

Laser micromanipulators deliver laser energy to difficult to access regions within the head and neck allowing surgeons to perform high precision microsurgical procedures. In this study, the laser spot sizes (as a function of power) produced by a two micromanipulators of different optical design were compared. A CO2 laser and operating microscope (400 mm focal length) was coupled to either a reflective (Cassegrain- like) (Unimax 2000, Reliant Technologies, Inc., Foster City, CA) or refractive micromanipulator (Microslad 719, Sharplan Lasers Inc. Allendale, NJ). The laser spot size was determined by measuring the region of ablation following laser irradiation of dry tongue blades, exposed photopaper, and agar gel using optical micrometry. Laser power was varied from 0.5 to 20 W for pulse durations of 0.1 and 0.5 seconds. A logarithmic relationship between spot size (diameter) and laser power on wood and photopaper was observed for both devices. In agar samples a discontinuity in spot size was observed at 9 W due to the formation of a large ablation crater on the surface of the agar. For a given laser power, the micromanipulator with reflective optics demonstrated overall smaller spot sizes and lower incremental change in spots size with increasing power. These results suggest the reflective micromanipulator tested in this study produced a smaller spot size at all powers tested, and with increasing power the spot size increased more slowly than with the conventional refractive optical device tested.

Paper Details

Date Published: 17 May 2000
PDF: 5 pages
Proc. SPIE 3907, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems X, (17 May 2000); doi: 10.1117/12.386237
Show Author Affiliations
Kenneth K. H. Chao, Univ. of Texas Health Science Ctr./San Antonio and Beckman Laser Institute and Medical Cli (United States)
Eric Cheung, Beckman Laser Institute and Medical Clinic (United States)
William B. Armstrong, Beckman Laser Institute and Medical Clinic (United States)
Brian Jet-Fei Wong, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 3907:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems X
R. Rox Anderson; Kenton W. Gregory; Eugene A. Trowers; David S. Robinson; Kenneth Eugene Bartels; Lou Reinisch; Reza S. Malek; C. Gaelyn Garrett; Lloyd P. Tate; Hans-Dieter Reidenbach; Timothy A. Woodward; Kenneth Eugene Bartels; Lawrence S. Bass; George M. Peavy; C. Gaelyn Garrett; Kenton W. Gregory; Nikiforos Kollias; Harvey Lui; Reza S. Malek; George M. Peavy; Hans-Dieter Reidenbach; Lou Reinisch; David S. Robinson; Lloyd P. Tate; Eugene A. Trowers; Timothy A. Woodward, Editor(s)

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