Design and construction of a precision cartilage reshaping device

Matt A. Burden; Elizabeth Johansen; Brian Jet-Fei Wong M.D.

doi:10.1117/12.427819

21 May 2001 Design and construction of a precision cartilage reshaping device

Matt A. Burden, Elizabeth Johansen, Brian Jet-Fei Wong M.D.

Proceedings Volume 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI; (2001) https://doi.org/10.1117/12.427819
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Matt A. Burden, Elizabeth Johansen, and Brian Jet-Fei Wong M.D. "Design and construction of a precision cartilage reshaping device", Proc. SPIE 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI, (21 May 2001); https://doi.org/10.1117/12.427819

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