Transcript Document
NATURAL GAIT INDUCING TRANSTIBIAL PROSTHETIC LUCIA MELARA ROBERT SCOTT ALEXIS GARO EML 4551 ETHICS AND DESIGN PROJECT ORGANIZATION FIU DEPARTMENT OF MECHANICAL ENGINEERING MIAMI, FL PROBLEM STATEMENT Current prosthetics produce secondary disabilities Back complications Metabolic problems Passive prosthetics cannot dynamically adjust “push off” force “Active” prosthetics exist however are impractical High cost prevents access to most patients Majority of transtibial amputees are impoverished 3-6 month adaptation period EXISTING POWERED PROSTHETICS AMP Foot 2 BIOM T2 System PROJECT OBJECTIVES Design an ankle prosthesis able to actively adjust “push off” force Reduce cost to achieve higher cost efficiency than industry average Increase walking range on single charge to 4 kilometers Design actuation system to allow quick changes of drive motor(s) and springs 5 pound maximum system weight ENGINEERING STANDARDS FDA: Center for Devices and Radiological Health Class I device per Code of Federal Regulations Title 21 Section 890.3420 FDA ensures patient safety with device Device not subject to specific restrictions ASTM standards for used material values Aluminum Association referenced for material selection HILL TYPE MUSCLE MODEL Mathematical model which views a muscle as spring like structure Consists of contractile, series, and parallel elements Produces torque values in reference to angle Compared to values for natural ankle HILL TYPE MUSCLE MODEL HILL TYPE MUSCLE MODEL ACTUATOR DESIGN ANALYSIS PROPOSED SOLUTION Use data from sensors to determine the appropriate torque curve Compensate for walking speed, slope, terrain changes Predict user’s next step using predictive algorithms and sensors “Echo Location” control approach to learn from opposite leg Higher efficiency actuator system Lighter, higher efficiency batteries More efficient actuator system implementing an SEA+UPS system SOLIDWORKS MODEL GLOBAL DESIGN INTEGRATION Modularity Prosthesis can be combined with different knee prosthetics Replaceable batteries Interchangeable motor unit Simple design that can be manufactured without a CNC machine 3D printed enclosure Research paper to be published PROJECT TIMELINE CONCLUSION AND FUTURE WORK Completed: Motion analysis of human gait cycle Proposed designs To be done Complete actuator design analysis on proposed designs Perform simulation studies Manufacture first prototype Perform metabolic and range tests at secured testing facility QUESTIONS?