1. Fault Tree for Wheelchair Mounted Transfer Assist Device
Mike Anderson
Andrew Feola
Jill Marion
Bryan Shelly
BioE1161
April 18, 2006

2. Patient Hazard A B C D

3. (power wheelchairs only)
Power Hazards A
Shock from wheelchair
(power wheelchairs only)
Power failure of the system
Failure to automatically shut
Off power
Power system malfunction

4. Transfer board doesn’t
Mechanical Failures
Transfer Board
Position
Transfer Board
Mechanics
Wheels not locking
In place properly
Failure due to
cyclic stress
Failure due to
ultimate stress
Transfer board not in
a sturdy position
Transfer board doesn’t
lock in position

5. Patient Errors C C.1 Injury during transfer Fall while performing
Clothing getting stuck
in the seat/hardware
Incorrect use of
Transfer board
Improper transferring
technique

6. C.1 Transfer board Incorrectly placed Patient attempts to
transfer a distance
greater than 18”
Transfer board
slides from
underneath patient

7. Cushion seat wears down
Body Injury D
Increased pressure on
patients back/hip
Pressure Sores
Cushion seat wears down
Seat cushion left in
an incorrect position