Fault Tree Analysis Anna DiRienzo, Katelyn Lesk, Amber Loree, and Jude Menie

Device Failure Mode A D B C

A Device cannot support load Device not sensitive enough for small pressure changes Incorrect vertical Tracking system Incorrect calculation of center of gravity Failure of Gooseneck to support Inaccurate weight distribution Incorrect alignment and/or attachment with iSCAN Mechanical Failures Failure of L-plate

Operator Errors B Incorrect Sterilization Improper cleaning Contaminated Device Incorrect Positioning Too close to patient’s eye Too far away from patient’s eye Haphazardly Stored Missing parts Device broken

C Design Errors Attachments Large adjustment to IV pole Large adjustment to small adjustment Small adjustment to device Improper Attachment by Physician Loose screws Material failure Loose screws Material failure Movement of base while device is in use Tipping of structure Center of gravity off-balance Locking wheels not utilized by operator Operator leans on device improperly No enough weight on base

D Material Failure More wear and tear than expected Destabilization Fatigue Gooseneck Small adjustment Repetitive use