Measurement of the elastic modulus of rabbit nasal septal cartilage during Nd:YAG (lambda = 1.32 microm) laser irradiation

Lasers in Surgery and Medicine
Kenneth K H ChaoBrian J F Wong

Abstract

The objective of this study was to quantitatively measure changes in the elastic moduli of rabbit nasal septal cartilage during laser heating. While the efficacy of laser cartilage reshaping has been established for use in nasal surgery, few studies have investigated the temperature-dependent viscoelastic behavior of cartilage. Cyclic force versus displacement curves were generated during the Nd:YAG laser (lambda = 1.32 microm, 10 second exposure time, 21.22 W/cm2) irradiation of cartilage specimens secured in cantilevered geometry. Samples were irradiated three times with 30 second cooling intervals between each laser exposure. Measurements were recorded before, during, and after laser irradiation, and then following complete rehydration in normal saline (NS) for 1 hour at 25 degrees C. Elastic modulus was calculated assuming linear viscoelastic behavior. The elastic modulus in native tissue decreased during and after successive laser exposures from about 6 to 3.5 MPa. After rehydration, the modulus returned to near-baseline value. Surface temperature reached a maximum of 65 degrees C. The laser irradiation of cartilage using parameters similar to those used in reshaping does not produce significant irreversible changes in the...Continue Reading

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Citations

Jul 27, 2007·Meditsinskaia tekhnika·S A AgeevaL G Tomilova
Nov 26, 2013·Journal of Biomechanics·Ayman A Al Dayeh, Susan W Herring
Jul 31, 2009·Journal of Biomechanical Engineering·F XuK A Seffen
May 29, 2004·Journal of Clinical Laser Medicine & Surgery
Mar 9, 2007·Lasers in Surgery and Medicine·Dmitriy E Protsenko, Brian J F Wong
Sep 12, 2012·The Laryngoscope·Christian CondermanBrian J F Wong
May 25, 2011·IEEE Transactions on Bio-medical Engineering·Edward C WuBrian J F Wong
Mar 22, 2006·Archives of Facial Plastic Surgery·Amir M KaramBrian J F Wong

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