Case Studies
Medical Devices We participate in strategic evaluation
of new medical device technologies, evaluate the physiological
environments for medical devices, assess failures, and review
patent infringement claims. We offer specialized implant testing
services, and we perform structural analysis of implantable
medical devices, including total hip replacements and cardiovascular
stents.
 A
Mysterious Train Accident A man ejected from a moving
passenger train was found dead near the tracks. We were asked
to determine whether the faulty design of a door or window
of the train had allowed him to fall to his death. We analyzed
all of the fractures, bruises, and lacerations he sustained.
We examined the train's doors and windows. We evaluated the
body's resting position relative to the train tracks. The
facts we uncovered—including the absence of a neck injury—indicated
that the individual exited the train feet first. He either
jumped or was thrown from the train. The design of the door
and window did not contribute to the accident. We demonstrated
our conclusions with state-of-the-art computer simulation
and animation.
A Failed Implant Device An individual with a newly
implanted lumbar spine device was involved in a motor vehicle
accident not long after surgery. The post-accident examination
indicated that one of the eight cables in the device had broken.
When two other cables subsequently broke, the device was removed.
Exponent was hired to determine why the lumbar spine device
failed. Our analysis of the traffic accident revealed that
it was unlikely to have been severe enough to produce failure
of the first cable. Microscopic evaluation of the retrieved
spinal implant showed that the cables fractured as a result
of fatigue rather than a single overload. Finally, our analysis
of the patient's x-rays revealed that one cable was actually
broken before the accident. The case settled in mediation.
When our clients ask us what caused an injury or a device
failure, we use scientific discipline, state-of-the-art investigative
techniques, and multidisciplinary collaboration to present
the scientific reality accurately and understandably.
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