German Medical Science GMS Publishing House; Düsseldorf
Dreiländertagung D-A-CH, 24. Wissenschaftliche Jahrestagung der Deutschen Gesellschaft für Phoniatrie und Pädaudiologie e.V.;
Introduction: The study of the visco-elastic characteristics of the vocal fold tissue is important for understanding the biomechanical properties of this tissue and their effect on vocal fold oscillation. The set goal of this work was to determine directional variations of the elastic properties of the vocal fold. Materials and methods : 14 excised human larynges were split along the sagittal plane, mounted without tension, and measured each semilarynx using a Linear Skin Rheometer (LSR). The LSR-probe was attached primarily to the vocal fold epithelium mid-membranous between the anterior commissure and vocal process using a round suction catheter of 2.7 mm outer diameter. The elastic response was measured by applying stress at 5 different angles. Additional measurements were made in a similar procedure for epithelium, lamina propria, ligament and muscle. The successive exposure of different layers was correlated with histology. Results: The distribution of elastic pliability in different directions will be demonstrated. Conclusion: The range of shear modulus derived using this method is comparable to that obtained by our team in-vitro in a previous published study and by other research groups obtained in-vivo or in-vitro. In addition to the confirmation of previous results we highlight an anisotropic nature of the vocal fold tissue.