Final Project Overview GROUP MEMBERS: Irma Bocova Rob Bowman Phetphouvanh “Awt” Phommahaxay Kyle Pilote Jeff Rebmann Chris Rowles Faculty Guide: Dr. Elizabeth DeBartolo February 19, 2010 Mechanical Spine Test Platform P10007

Agenda Mission Statement Project Description Background/Application Customer Needs Engineering Specifications Final Concept Selection Mechanical Structures Sensor Software LabVIEW Output Architecture Validation and Verification Specifications Attained Project Overview Future Iterations Project Conclusion Acknowledgements Demo (Time Permitting)

Project Description Project Title: Project Title: Mechanical Spine Test Platform Primary Customer Primary Customer  Dr. Sara Gombatto  Professor at Nazareth College of Physical Therapy  Dr. JJ Mowder-Tinney  Director of Clinical Education Nazareth College Department of Physical Therapy  Physical therapy patients Secondary Opportunities Secondary Opportunities  Further spinal iterations

Background/Application Nazareth Physical Therapy Clinic motion capture system  Allows motion capture of PT patients in order to track progress Validation of existing motion captures Focus on spinal segments Secondary Application:  Portable Motion Tracking System calibration Source: Source:

Customer Needs Three tiered approach to group needs and limit scope  Base Plan  Aggressive  Outstanding Example Need: Must be moveable in distinct segments  Base Plan – Two distinct sections (Lower & Upper Lumbar)  Aggressive – Three distinct sections (Lower & Upper Lumbar, Thoracic)  Outstanding – Divide Thoracic segment into multiple segments Highest Ranked Needs – Base Plan Needs to be able to measure angle deviations for all sections relative to the section below it Use a tight tolerance for measurements Provide measurements in all three planes of space (x, y, z) Needs distinct sections of the spine to be able to move Needs to be adjustable lengthwise in order to simulate different size spines Movements needs to be lockable so that an accurate measurement can be read The height of the device has to be the level of a spine of a person standing in an upright position Needs to have a “zero” position for all sensors/joints

Engineering Specifications Correspond to highest ranked Customer Needs: SpecificationUnits Base Plan Value Aggressi ve Value Outstandi ng Value Must have a minimum tilt in all directions relative to the section below degrees +/- 20 Angle tolerancedegree+/- 0.1 Must have a tilt in all directions relative to the section below planes 3 (sagittal, transverse, frontal) Must be movable in distinct sections and a fixed base (pelvis) movable sections 2 (lower lumbar, upper lumbar) 3 (thoracic) Divided thoracic Should be able to fit all required ranges needed by customer vertically millimete rs for each lumbar segment 200 – 300 for thoracic segment Joint strengthFt - lbs Device must mimic a person standing in an upright position - Trochanterior Height millimete rs Device has mechanical "zero" positionYes/No Yes

Final Concept Selection Spinal Structure & User InterfaceMarker Placement Diagram Main Structure Rendering

Mechanical Structure Three segments separated by tightening ball-joints (lock into static position) Non-Ferrous (aluminum, brass, and wood) 1 inch increment segments (2-5 inches adjustability per lumbar segment) Fixed Pelvis ( adjustable height) with wooden base Horizontal members for reflective markers Brass set screws Flat black enamel coating

Sensors Two MicroStrain 3DM  Measures roll, pitch and yaw  DC Accelerometers in orthogonal array with respect to Earth’s gravity  Magnetometers with respect to Earth’s magnetic fields  +/- 1.0 degree of accuracy

Software LabVIEW  Translate digital outputs of sensors  Outputs compatible to MS Excel spreadsheet  User Interface User Interface

Validation and Verification 3DM Sensor  Mechanical versus electrical  Offsite and Onsite testing  Within +/- 1.0 degree of accuracy (roll, pitch and yaw) Sensor Test Fixture YAW Upper Lumbar Lower Lumbar Specification Needed Average Deviation ± ⁰ ± ⁰ ± 1.0 ⁰ Standard Deviation Accuracy Testing (Worst Case)

Validation and Verification Spine Platform  Onsite testing  Mechanical and electrical  Simultaneous reading of 3DM  Interference (magnetic and infrared)  Static holding position (tension required)  Stability (tipping force)  Portability (overall weight)  User friendly (setup time and testing time) 1 st Iteration Mechanical & Electrical test

Specifications Attained

Project Overview Successes  Met a tight accuracy tolerance  Able to output real time data and capture to an external spreadsheet for further analysis  Created user friendly platform  Custom built ball joints and stand  Minimized sensor interference Recommendations  Do not underestimate time needed to complete mechanical tasks  Outsource the welding  Use CNC machines when possible for accuracy and time purposes  Further understand the sensitivity issues of the magnetometer in the sensors  Have a better general knowledge of software/hardware integration

Future Iterations Add a thoracic region to better represent a human spine  Break the segments down even further if possible Incorporate non-electromagnetic interference design Look into purchasing NI LabVIEW license for Nazareth College Wireless sensors Powder coat or anodize to increase durability of coating Use a plastic material instead of aluminum

Project Conclusion The specifications for the final spinal structure and user interface were met for all base plan values and for some of the aggressive values and outstanding values Customer was satisfied with testing and verification Customer was satisfied with final user output design and functionality

Acknowledgements Dr. Sara Gombatto  Nazareth College Physical Therapy Department Dr. Elizabeth DeBartolo  Faculty Guide – Rochester Institute of Technology National Science Foundation  Project Sponsor Dr. Robert Bowman  EE Professor – Rochester Institute of Technology Professor John Wellin Professor Madhu Nair RIT Machine Shop Staff