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Proceedings Paper

Design and construction of a precision cartilage reshaping device
Author(s): Matt A. Burden; Elizabeth Johansen; Brian Jet-Fei Wong
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Paper Abstract

This manuscript describes the design and construction of device which controls the laser reshaping of cartilage specimens using dynamic measurements of changes in tissue optical properties and surface temperature as feedback control variables. Diffusely transmitted light from an amplitude modulated diode laser ((lambda) equals670 nm, 5 mW) was collected using a multimode optical fiber and measured with a silicon photoreceiver using lock in detection method. Surface temperature was measured with a thermopile. A jig was constructed to maintain porcine nasal septal cartilage specimens (25.0 x 10.0 x 2.0 mm) in deformation during photothermal heating. The jig and specimen were translated relative to a fixed laser spot using two motors controlled using LabView software and a motion control card. Software allowed implementation of several different modes of operation including closed-loop feedback control or open- loop (user defined) conditions. This device has allowed the systematic evaluation of the effect of laser dosimetry on the reshaping process. Design considerations are discussed along with suggestions for clinical device development.

Paper Details

Date Published: 21 May 2001
PDF: 6 pages
Proc. SPIE 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI, (21 May 2001); doi: 10.1117/12.427819
Show Author Affiliations
Matt A. Burden, Harvey Mudd College and Beckman Laser Institute and Medical Clinic (United States)
Elizabeth Johansen, Harvey Mudd College and Beckman Laser Institute and Medical Clinic (United States)
Brian Jet-Fei Wong, Harvey Mudd College, and Univ. of California/Irvine (United States)


Published in SPIE Proceedings Vol. 4244:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI
Lawrence S. Bass; Abraham Katzir; David S. Robinson; Hans-Dieter Reidenbach; Eugene A. Trowers; Timothy A. Woodward; Kenton W. Gregory; Lou Reinisch; C. Gaelyn Garrett; Kenneth Eugene Bartels; Lloyd P. Tate; George M. Peavy; Michael D. Lucroy; R. Rox Anderson; Kenneth Eugene Bartels; Lawrence S. Bass; C. Gaelyn Garrett; Kenton W. Gregory; Abraham Katzir; Nikiforos Kollias; Michael D. Lucroy; Reza S. Malek; J. Stuart Nelson; George M. Peavy; Hans-Dieter Reidenbach; Lou Reinisch; David S. Robinson; Lloyd P. Tate; Eugene A. Trowers; Timothy A. Woodward; Reza S. Malek, Editor(s)

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