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Proceedings Paper

Determination of optimum laser parameters for cartilage reshaping in porcine septum using Nd:YAG laser (lambda=1.32 um)
Author(s): Elizabeth Johansen; Matt A. Burden; Brian Jet-Fei Wong
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Paper Abstract

In this study, a computer-controlled instrument was designed and constructed in order to systematically evaluate the effect of laser dosimetry on shape change during laser- mediated cartilage reshaping. Porcine nasal septal cartilage specimens, stripped of periocondrium were cut (25 x 5 x 2 mm) using a custom guillotine microtome and bent into a cylindrical shape (7.38 mm bend radius) using a jig constructed from aluminium tubing and high tension wire. Each specimen was irradiated (Nd:YAG laser λ= 1.32 μm, 6-10 W, 2-16 s pulse duration, 31-51 W/cm2) in five distinct regions using a pattern that maximized cooling between laser exposures. Real-time measurements of tissue optical properties and surface temperatures were recorded during each laser exposure as these features correlate with the onset of stress relaxation and shape change. After irradiation, each specimen was re-hydrated in saline solution (15 minutes), removed from the jig, and photographed with a digital camera. The radius of curvature of the specimen was compared to the radius (7.38 mm) of the reshaping jig. Optimal reshaping (greatest degree of curvature) was observed at 6W, with an irradiation time of 16s, or alternately at 10W, with an irradiation time of 8s.

Paper Details

Date Published: 9 July 2001
PDF: 8 pages
Proc. SPIE 4257, Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical, (9 July 2001); doi: 10.1117/12.434706
Show Author Affiliations
Elizabeth Johansen, Harvey Mudd College and Beckman Laser Institute and Medical Clinic (United States)
Matt A. Burden, Harvey Mudd College and Beckman Laser Institute and Medical Clinic (United States)
Brian Jet-Fei Wong, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)


Published in SPIE Proceedings Vol. 4257:
Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical
Donald Dean Duncan; Peter C. Johnson; Donald Dean Duncan; Steven L. Jacques; Peter C. Johnson, Editor(s)

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