The RAPID 2013 Conference & Exposition Directory - Society of ...

ConferenCe Details
patients are extremely active and desire to take part in numerous
complex activities such as kayaking, skiing, scuba diving,
etc. Prosthetics can accommodate, design, and manufacture
numerous devices with standard materials and limb assemblies
currently on the market to address these needs; however,
some specialty attachments need to be custom designed and
manufactured. Additive manufacturing is the most flexible and
applicable solution to aid in these limited quantity production
needs. Custom attachments are currently being manufactured at
the 3D Medical Applications Center, WRNMMCB, for a multitude
of functions such as “Shorty Feet” and “Mechanics Feet,” that
allow a bilateral amputee to walk and maneuver under cars
without attaching their full prosthetic; a “Pilot Foot” to help an
amputee continue to pilot a plane; a “Hockey Hand” to allow a
wounded warrior to play hockey with both hands on the stick; and
a “Gun Holder” to allow an amputee to hold and fire a handgun.
2–2:25 pm
Design and Fabrication of a Variable Impedance
Prosthetic Socket Through Multimaterial
3D Printing Techniques
David M. Sengeh, MS, Graduate Student, MIT Media Lab
Today, nearly 100% of amputees report some form of discomfort
in their prosthetic sockets. Our session will highlight work done
in the design and manufacture of a multimaterial 3D-printed
prosthetic socket by the Biomechatronics Group at MIT Media
Lab and Stratasys. Custom-fitted prosthetic sockets designed with
variable impedance determined by the underlying anatomy at each
node within the prosthetic socket have been manufactured and
used in lab settings. Our prototypes, which combine conventional
manufacturing processes and 3D printing, have been used outside
the lab in a recent investigation. The combination of both CAD/
CAM and conventional materials and processes gives us the best
of both worlds: structural integrity and variable impedance to
increase the comfort level of amputees.
2:30–2:55 pm
Guided Decision Making in Aortic Aneurysms Using
Patient Specific 3D Reconstructions and Printed
Models: A Case Study
Todd Pietila, B.SC., Application Engineer, Materialise USA
Objective: We demonstrate a case of a complex aortic dissection
operated 11 years ago, presented recently with a fast growing
aneurysm in the distal arch and descending aorta. Closure
was tried unsuccessfully with a small occluder. The case was
further investigated with a novel method of 3D reconstruction
and additive manufacturing. The objective of this study was to
evaluate if the patient-specific 3D reconstruction and 3D-printed
model provides information on the failure of the first intervention,
and reveals other options for treatment.
Conclusions: This novel approach of 3D reconstruction as well as
3D printing convincingly showed the failure of the first occluder
position to resolve the problem. It revealed other reentries into
the false lumen which were not visible on the normal CT scan.
Therefore, we conclude that 3D reconstruction as well as 3D
printing can help in planning and follow-up in such complex
surgical/interventional cases.
3–3:25 pm
3D Printing Advances Patient-Specific Biomedical
Engineering Modeling and Experimentation
William W. Dahl, Vice President, Marketing and Communications,
Solidscape, Inc.
David H. Frakes, PhD, Assistant Professor, Arizona State
University, School of Biological and Health Systems Engineering
John Wigand, MME, Vice President of Product Development &
Strategy, Solidscape, Inc.
Cerebral aneurysms affect 1 in 50 people and cause nearly
20,000 deaths in the United States every year. With endovascular
treatments as the standard of care for cerebral aneurysms,
anatomically correct, transparent aneurysm models for fluid
dynamic experiments are needed in improving device design and
flow knowledge. While direct-from-RP approaches to transparent
modeling have come a long way, they are currently not wellsuited
for accurate fluid dynamic experimentation. We present a
wax-based RP and lost-core methodology as an alternative that is
cost-and-time-effective in creating transparent, scale aneurysm
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