Study of laser mediated cartilage reshaping

Dimitar Dobrikov; Lachezar Avramov; Seryozha Valkanov

doi:10.1117/12.618432

22 April 2005 Study of laser mediated cartilage reshaping

Dimitar Dobrikov, Lachezar Avramov, Seryozha Valkanov

Proceedings Volume 5830, 13th International School on Quantum Electronics: Laser Physics and Applications; (2005) https://doi.org/10.1117/12.618432
Event: 13th International School on Quantum Electronics: Laser Physics and Applications, 2004, Bourgas, Bulgaria

Abstract

Cartilage is a specialized tissue, which serves as a load-bearing structure. Its main components are: 70% water, 10-20% collagen fibers, 5-10% proteoglycans, 5%-chondrocytes. When bent, cartilage exhibits its property of shape memorization. Laser radiation may be used to change the shape of cartilage by heating of mechanically deformed specimen. The high water percentage in the cartilage, which determines its mechanical properties, raises the question of whether the medium in which the sample is placed influences the process of relaxation, connected with cartilage water losses. Using Nd:YAG laser (λ=1.32 μm), cartilage samples were irradiated. The stress relaxation time, the surface temperature during irradiation and the time dependence of the backscattered light intensity (which is indication for changes in the internal stress), were compared. The shape retention was measured by comparing the curvature before and after irradiation. Overbending of specimens was done in order to achieve the required angle. The obtained data could be used for development of clinical methods for correction or transplantation of injured human cartilage due to trauma or certain diseases.

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Dimitar Dobrikov, Lachezar Avramov, and Seryozha Valkanov "Study of laser mediated cartilage reshaping", Proc. SPIE 5830, 13th International School on Quantum Electronics: Laser Physics and Applications, (22 April 2005); https://doi.org/10.1117/12.618432

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KEYWORDS

Cartilage

Collagen

Nd:YAG lasers

Water

Tissues

Laser irradiation

Molecules

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