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3-D Larynx Model with Moving Parts

3-D Larynx Model with Moving Parts. Advisor: Professor William Murphy Client: Sherri Zelazny. Rexxi Prasasya – Team Leader Chou Mai – Communicator Karen Chen – BSAC Jason Tham - BWIG. Larynx Anatomy. Transverse arytenoid muscle contracts Arytenoid cartilages pulled Vocal fold closed.

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3-D Larynx Model with Moving Parts

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  1. 3-D Larynx Model with Moving Parts Advisor: Professor William Murphy Client: Sherri Zelazny Rexxi Prasasya – Team Leader Chou Mai – Communicator Karen Chen – BSAC Jason Tham - BWIG

  2. Larynx Anatomy • Transverse arytenoid muscle • contracts • Arytenoid cartilages pulled • Vocal fold closed • Parts of larynx involved in vocalization • Arytenoid cartilages rotate around the vertical axis • Lateral cricoarytenoid • muscles adduct • Vocal fold closed • Adduction (AD) • Abduction (AB) • Anterior-posterior sliding (AP) • Medial-lateral sliding (ML) (Wesley, 1999)

  3. Thyroarytenoid muscle pulls the arytenoid cartilages • Vocal fold loosen • High-pitch sound produced • Posterior cricoarytenoid muscle rotates arytenoid cartilages laterally • Vocal cords separate • Cricothyroid muscle rotates the thyroid cartilage • Vocal fold stretched (Wesley, 1999)

  4. Larynx Movement

  5. Problem Statement • 3-D, automated, functional larynx model • Show anatomical structure of larynx • Animate dynamics of the larynx in sound production • Educational model • Improve understanding of larynx • Assist in planning laryngeal treatments and therapy

  6. Available Products • Static functional larynx model • Movable arytenoid cartilage and pliable plastic vocal cords • No automation • Visual-aid software program (Sargent- Welch, 2008)

  7. Design Requirements • Anatomical Representation • Cartilages and muscles present and labeled • Scaling of 3X actual size • Dynamic Representation • Abduction/Adduction of arytenoid cartilage • Flexion/Extension of thyroid cartilage • All muscles associated with cartilage motion

  8. Past Achievement • Integrated precision motor system • Three reversible electric motors – three cartilage movements • Flexible wires connect cartilages to motors • Increase comprehension of laryngeal function by 36% • The prototype dysfunctional • Plaster cartilages • Silicone muscles Spring 2008 prototype

  9. New Model • 3x functional larynx • Anatomically accurate movement • Muscles included • Plastic – simple modification • Focus on dynamic automation http://www.einsteins-emporium.com

  10. Arytenoid Cartilage Motion Designs • Rotational string • Ball and socket • Spring and track (Wesley, 1999)

  11. Rotational Spring • Use spring to attach arytenoid cartilage to cricoid cartilage • Attach strings to each cartilage • Strings mimic contraction and motion • Strings attach to motor Sketch of rotational spring design

  12. Ball and Socket • Socket implemented on cricoid cartilage • Ball attached to each arytenoid cartilage • Allows “gliding” and “rocking” motions Sketch of ball and socket design

  13. Spring and Track • Springs attached to arytenoid cartilages • Track attached to cricoid cartilage • Allows arytenoid cartilages to slide and rock Sketch of spring and track design

  14. Design Matrix

  15. Future Work • Automate cartilage movement • Implement LED indication of muscle contraction • Create demonstration coordinating motion and sound • Test effectiveness as educational tool

  16. References • http://www.einsteins-emporium.com • Meyer, J., Roggow, K., Hanson, K., Ladwig, N. Larynx model: final report. 2008 • Sargent-Welch Company. 2008 • Wesley, N. “The Anatomy Lesson.” Georgetown University. 1999.

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