The Larynx TeamAn OverviewWhy build a larynx model?Complexity you take for grantedExisting ModelsClient Specifications:Three Design OptionsSlide 8Slide 9Model ConstructionThe MatrixFuture WorkSlide 13ReferencesThe Larynx TeamKen RoggowKevin HansonNick LadwigJonathan MeyerAn Overview•Motivation•Background•Specifications•Design options•Design matrixWhy build a larynx model?•Our client is a speech pathologistat the UW-Health Voice and Swallowing Clinic•She sees about 500 patients/month•She wants a functioning laryngeal model +Patient education +Treatment plansComplexity you take for granted•The larynx is composed of muscle, cartilage, and soft tissues•6 muscle groups work together to produce phonationThyroarytenoidCrycothyroidInterarytenoidExisting ModelsExisting movable designs use drawstrings to make motion.They don’t show how muscles work together in common motionsClient Specifications:•The model must be 3x scale or greater•The model needs to be light enough and small enough for one person to easily move it•The model must span from the hyoid bone to the second tracheal ring, and show tissue, major muscles, and bone•It must show the vocal folds opening, closing, and stretching.•The movements must take at least 2 secondsThree Design Options•Electric currents make piezoelectric materials change volume–Current on: muscles contract–Current off: muscles return to original shape•The muscles would be stretched to their original positions by an elastic materialOption 1: Piezoelectric Circuit SystemThree Design OptionsThe actuators could be attached between the cartilage pieces, and then coated to make them look like muscle.Option 2: Pneumatic Actuator SystemPneumatic actuators are moved by compressed airThree Design Options•Reversible motors have variable speed and direction –Allows precise, coordinated speed and movement•3 battery powered, reversible motors would be located at the base of the model in a box•The muscles would be controlled by flexible wires connected to the motors.–Motor forward: muscle contracts–Motor reverse: elastic material pulls muscle to original positionOption 3: Precision Motor SystemModel Construction•An elastic material (natural rubber) will pull muscles back to their original positions when the motors are reversed•The bone and cartilage will be made from plastic (polycarbonate) –The hyoid bone and trachea will be used as an attachment base•The model will be mounted on a plastic box which holds the 3 motors and provides a stable base •Wires run up through the trachea and into their respective muscles, hidden within the model cartilage•The motor pulls the hinged thyroid forward, simulating the crycothyroid muscleThe MatrixRealism0.3Feasibility0.3User Friendliness0.15Cost0.1Durability0.1Future Expandability0.1TotalPrecision Motor41.251.540.650.540.450.5 4.45Pneumatic Actuator30.930.920.330.340.420.2 2.9Piezoelectric 51.510.340.610.150.540.4 3.2Future Work•Construction•Motor selection and programming•Testing and implementationAny Questions?References•Pictures:
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