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Proceedings Paper

Quantification Of Tissue Effects Due To A Pulsed Er:Yag Laser At 2.9 Gm With Beam Delivery In A Wet Field Via Zirconium Fluoride Fibers
Author(s): R. F. Bonner; P. D. Smith; M. Leon; L. Esterowitz; M. Storm; K. Levin; D. Tran
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Paper Abstract

Prototype Er:YAG lasers were used to generate 70-170 usec long pulses of 2.9 urn containing a series of lusec relaxation oscillation spikes which were coupled into prototype zirconium fluoride glass optical fibers of 180-250 urn diameter. Pulse energy densities in excess of 2400 mJ/mm2 were transmitted through these fibers without damage. Systematic studies of tissue damage by the Er:YAG laser pulses delivered to the surface of the tissue in a wet field via the ZrF4 fibers demonstrated effective ablative thresholds of 5 mJ/mm2 and slope ablative efficiency of 0.5 mm3/J for soft tissue such as human cadaver coronary artery. For heavily calcified tissues such as hard human calcified atherosclerotic plaque or rib bone ablative thresholds were increased 3 fold and the slope efficiency was slighlty decreased. Tissue thermal damage zone was confined to a region of 3-5 urn from the edge of the ablated zone for suprathreshold pulses. These studies demonstrate the feasibility of an Er:YAG laser - zirconium fluoride fiber microsurgical system for laser angioplasty and other forms of remote human ablative microsurgery.

Paper Details

Date Published: 1 April 1987
PDF: 4 pages
Proc. SPIE 0713, Optical Fibers in Medicine II, (1 April 1987); doi: 10.1117/12.937359
Show Author Affiliations
R. F. Bonner, National Institutes of Health (United States)
P. D. Smith, National Institutes of Health (United States)
M. Leon, National Institutes of Health (United States)
L. Esterowitz, Naval Research Laboratory (United States)
M. Storm, Naval Research Laboratory (United States)
K. Levin, Naval Research Laboratory (United States)
D. Tran, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0713:
Optical Fibers in Medicine II
Abraham Katzir, Editor(s)

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