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Proceedings Paper

Alternative infrared lasers for endoscopic surgery
Author(s): Lawrence S. Bass; David E. Font; Mehmet Cengiz Oz; Stephen L. Trokel; Michael R. Treat
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Paper Abstract

There are substantial technical problems attendant to the removal of sessile polyps from the lumen of thin walled gastrointestinal organs such as the colon. A laser system which is capable of precise and circumscribed mucosal tissue vaporization would be useful for this task. Because of technical shortcomings of existing medical laser systems, we investigated the possibilities of mid-infrared lasers which could take advantage of large water absorption peaks in the 2 micron region to produce precise vaporization while retaining fiberoptic transmissibility. In addition to a high absorption wavelength, pulsed energy delivery contributes to precise vaporizing capabilities. The laser system that best fits our criteria is the 2.15 micron thulium-holmium- chromium:YAG which produces 200 microsecond pulses of energies up to 1 joule at firing rates up to 6 Hz. The laser output is transmitted efficiently via low hydroxyl quartz fibers. Ablative efficiency, defined here as the slope of the vaporization depth versus energy, reveals that the THC:YAG produces approximately 3 times greater depth of vaporization per joule than the cw Nd:YAG. On average, the Nd:YAG produced 1.5 times the amount of thermal damage as the THC:YAG for a given depth of vaporization. The THC:YAG laser should have an important clinical role since its use could reduce the risk of perforation in endoscopic laser procedures such as the removal of sessile polyps.

Paper Details

Date Published: 1 June 1990
PDF: 5 pages
Proc. SPIE 1200, Laser Surgery: Advanced Characterization, Therapeutics, and Systems II, (1 June 1990); doi: 10.1117/12.17500
Show Author Affiliations
Lawrence S. Bass, Columbia Univ. College of Physicians and Surgeons and Columbia-Presbyterian Medical Center (United States)
David E. Font, Columbia Univ. College of Physicians and Surgeons and Columbia-Presbyterian Medical Center (United States)
Mehmet Cengiz Oz, Columbia Univ. College of Physicians and Surgeons and Columbia-Presbyterian Medical Center (United States)
Stephen L. Trokel, Columbia Univ. College of Physicians and Surgeons and Columbia-Presbyterian Medical Center (United States)
Michael R. Treat, Columbia Univ. College of Physicians and Surgeons and Columbia-Presbyterian Medical Center (United States)


Published in SPIE Proceedings Vol. 1200:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems II
Stephen N. Joffe; Kazuhiko Atsumi, Editor(s)

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