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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
• Parts of larynx involved in
vocalization
•Arytenoid cartilages rotate
around the vertical axis
•Adduction (AD)
•Abduction (AB)
•Anterior-posterior sliding (AP)
•Medial-lateral sliding (ML)
•Transverse arytenoid muscle
contracts
•Arytenoid cartilages pulled
•Vocal fold closed
•Lateral cricoarytenoid
muscles adduct
•Vocal fold closed
(Wesley, 1999)
•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)
Larynx Movement
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
Available Products
 Static functional larynx model
 Movable arytenoid cartilage and
pliable plastic vocal cords
 No automation
 Visual-aid software program
(Sargent- Welch, 2008)
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
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
New Model
 3x functional larynx
 Anatomically accurate movement
 Muscles included
 Plastic – simple modification
 Focus on dynamic automation
http://www.einsteins-emporium.com
Arytenoid Cartilage Motion Designs
 Rotational string
 Ball and socket
 Spring and track
(Wesley, 1999)
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
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
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
Design Matrix
Cost
(2)
Teaching
effectiveness
(3)
Motion
Compatibility / Total
accuracy feasibility (2)
(3)
Rotational 2
spring
1
1
3
7
Ball and
Socket
1
3
3
2
9
Spring &
Track
1
2
3
2
8
Future Work
 Automate cartilage movement
 Implement LED indication of muscle contraction
 Create demonstration coordinating motion and sound
 Test effectiveness as educational tool
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.