DAVID J MONAHAN ME JAMES K STERN ME

DAVID J. MONAHAN (ME) JAMES K. STERN (ME) Motion Tracking System JAHANAVI S. GAUTHAMAN (EE) ASSIS E. NGOLO (CE) CORY B. LAUDENSLAGER (EE) BRIAN D. GLOD (CE) Research and Testing Rochester Institute of Technology BACKGROUND: PROJECT DELIVERABLES: National Science Foundation (NSF) has extensively helped RIT’s Assistive Devices family develop a strong relationship with the Nazareth College Physical Therapy Clinic. Physical therapists at Nazareth have long expressed a desire for portable motion tracking devices enabling monitoring of patients’ motion in their natural environments. Previously, two motion tracking projects, one tasked to track limb motion, and the second focusing on lower back (lumbar) motion were slated. Due to challenges identified from these prior motion tracking projects, the two were combined to create this P 10010, project. Instead of creating a fully functional motion tracking system, P 10010 will focus on developing a foundation of knowledge for future motion tracking projects. • Provide future research teams with sufficient tools to create a portable motion tracking device. • Enhance the knowledge base of the RIT Biomedical Systems and Technologies Track regarding sensor usage in human motion tracking. SYSTEM OVERVIEW: MISSION STATEMENT: To research sensors and implementation methods for portable motion tracking systems capable of measuring patients' range of motion in their natural environments. The various aspects of a motion tracking system: sensors, a portable micro -controller, interface circuitry, software, and human interfaces are explored. The primary ranges of motion of interest: • Motion of a human limb, where a limb is defined as a 3 -bar linkage, for example: upper leg, lower leg, and foot. • Motion of a human's lower back, where it is defined as the lumbar region, with 3 points of contact: sacrum, L 1 -L 2, L 3 -L 5. CUSTOMER NEEDS: TEST PLAN OVERVIEW: Componen Measurement of t Interest Test Fixture Sensors Sensors SENSOR RESULTS OVERVIEW: Flex Sensor Degrees Vs Voltage 180 160 140 Degrees (°) • The Product should be Portable • The Product should be Accurate • The Product should be Easy to Use • The Product Should be Sanitary • The Product should be Comfortable for Patient • The Product should be Durable Degrees of Freedom & Range Accuracy of Individual Measurements Accuracy over Time Safety/Nondestructive Testing Output Signal Power Output Signal Quality Power Accuracy of Individual Measurements Accuracy over Time Degrees of Freedom & Range Accuracy/DOF with Enclosures Read and Store Precision Functionality Data Format Data Amplify Signal Filter Power 120 100 80 60 40 20 6 Do. F Razor Ultra -Thin IMU 0 -20 Sensors MCU MCU-PC MCU-Sensor SELECTED MICRO-CONTROLLER: Sensors & Dimensions, Weight MCU's 0. 7 1. 2 1. 7 2. 2 2. 7 Voltage (V) 6 Do. F Razor Ultra-Thin IMU Output 6 Do. F- Atomic IMU +/-2 g Tri-axis Accelerometer 6 Do. F- Atomic IMU on Pendulum Fixture: Output vs. MATLAB Model TEST FIXTURE DESIGNS CONCEPTS: Arduino Mega Microcontroller The ATMega 1280 MCU is capable of sampling 16 analog inputs with a worst-case sample rate of 240 Hz. Currently the MCU logs the 10 -bit A/D conversions to a 2 GB micro. SD card provided by Libelium. The data is then converted back into voltages for analysis. Angles are determined by double integration using the trapezoidal rule. FINAL KNOWLEDGE Sensor & MCU: Research, Selection Matrices, FINAL INFRASTRUCTURE 4 Completed Test Fixtures FUTURE APPLICATIONS • RIT Multidisciplinary Senior Design Teams • Physical Therapy Clinics • Entertainment (Video Gaming, Animation) • Bio-robotics • Medical Applications Sensor & MCU Hardware Detailed Sensor Information, & Sensor Evaluation Results Extensive MCU Code Test Fixtures Research & Manufacturing Plans General Operation , Data Storage/Translation Test Plan Procedure for Testing & Analyzing Data MATLAB ADDITIONAL INFORMATION: For additional information visit our. Code: team Testing/Analysis website online at: https: //edge. rit. edu/content/P 10010/public/Home. This material is based upon work supported by the National Science Foundation under Award No. BES-0527358. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation. ACKNOWLEDGEMENTS: Nazareth Physical Therapy Institute (Primary Customer) Dr. Elizabeth De. Bartolo (Team Guide), RIT Dept. of Mechanical Engineering Dr. Daniel Phillips (Sensors Guide), RIT Dept. of Electrical Engineering Dr. Roy Czernikowski (Micro-controller Guide), RIT Dept. of Computer Engineering P 10010