Neck Positioner for Fluoroscopy Examination Clients: Victor Haughton, M.D. Josh Medow, M.D. Advisor: Wally Block, Ph.D. Team Members: Alison Boumeester Peter Strohm Kaitlin Brendel Allie Finney Megan Britson

Overview Motivation Cervical spine imaging Requirements fluoroscopy and previous work Requirements mechanics, materials, and safety Proposed designs – actuators vs. gears pro/con, design matrix Building the design

Motivation Neck extender/flexor for unconscious patient Used during fluoroscopic examination Must not interfere with imaging Minimize radiation exposure to hospital staff

Fluoroscopic Cervical Spine Imaging Several x-ray slides in motion Cervical spine injury diagnostics Linear actuator design Fluoroscopy Machine in UW-Hospital extension flexion http://www.rad.washington.edu/quickcases/cases/Case09/text.html

Mechanical Requirements Extend/flex the neck ± 45˚ from neutral Rotation rate less than 2˚/sec Stabilize patient’s head during motion No interference with lateral imaging

Design I – Vertical Actuator Modified version of last semester’s design Pin connections made to actuator

Design II – Gear and Motor Bidirectional motor drives headboard rotation Gear ratio controls neck rotation rate

Design III – Sideways Actuator Actuator under table saves space Pin connections provide stability

Design Matrix 25 23 17 14 19 8 7 5 10 20 29 21 75 83 80 Criteria Vertical Actuator Gear and Motor Sideways Actuator Safety (30) 25 23 Feasibility (20) 17 14 19 Expense (10) 8 7 Aesthetics (10) 5 10 Mechanics (30) 20 29 21 TOTALS 75 83 80

Building the Gear and Motor Design Refine design dimensions Research materials and manufacturers Construct prototype Franklin Institute (2007) US Plastic Corp (2007)

Acknowledgements Prof. Block Dr. Haughton Dr. Medow