The goal of this work is to develop a framework for manufacturing nonuniform wall thickness replicas of abdominal aortic aneurysms (AAAs). The methodology was based on the use of computed tomography (CT) images for virtual modeling, additive manufacturing for the initial physical replica, and a vacuum casting process and range of polyurethane resins for the final rubberlike phantom. The average wall thickness of the resulting AAA phantom was compared with the average thickness of the corresponding patient-specific virtual model, obtaining an average dimensional mismatch of 180 μm (11.14%). The material characterization of the artery was determined from uniaxial tensile tests as various combinations of polyurethane resins were chosen due to their similarity with ex vivo AAA mechanical behavior in the physiological stress configuration. The proposed methodology yields AAA phantoms with nonuniform wall thickness using a fast and low-cost process. These replicas may be used in benchtop experiments to validate deformations obtained with numerical simulations using finite element analysis, or to validate optical methods developed to image ex vivo arterial deformations during pressure-inflation testing.
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January 2014
Technical Briefs
Abdominal Aortic Aneurysm: From Clinical Imaging to Realistic Replicas
Sergio Ruiz de Galarreta,
Sergio Ruiz de Galarreta
Mechanical Department,
Tecnun,
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
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Aitor Cazón,
Aitor Cazón
1
CEIT and Mechanical Department,
Tecnun,
e-mail: acazon@tecnun.es
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
e-mail: acazon@tecnun.es
1Corresponding author.
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Raúl Antón,
Raúl Antón
Mechanical Department,
Tecnun,
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
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Ender A. Finol
Ender A. Finol
Department of Biomedical Engineering,
The University of Texas at San Antonio
,San Antonio, TX 78249
Search for other works by this author on:
Sergio Ruiz de Galarreta
Mechanical Department,
Tecnun,
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
Aitor Cazón
CEIT and Mechanical Department,
Tecnun,
e-mail: acazon@tecnun.es
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
e-mail: acazon@tecnun.es
Raúl Antón
Mechanical Department,
Tecnun,
Tecnun,
Universidad de Navarra
,San Sebastián 20018
, Spain
Ender A. Finol
Department of Biomedical Engineering,
The University of Texas at San Antonio
,San Antonio, TX 78249
1Corresponding author.
Contributed by the Bioengineering Division of ASME for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received July 12, 2013; final manuscript received October 29, 2013; accepted manuscript posted October 31, 2013; published online December 4, 2013. Assoc. Editor: Jonathan Vande Geest.
J Biomech Eng. Jan 2014, 136(1): 014502 (5 pages)
Published Online: December 4, 2013
Article history
Received:
July 12, 2013
Revision Received:
October 29, 2013
Accepted:
October 31, 2013
Citation
de Galarreta, S. R., Cazón, A., Antón, R., and Finol, E. A. (December 4, 2013). "Abdominal Aortic Aneurysm: From Clinical Imaging to Realistic Replicas." ASME. J Biomech Eng. January 2014; 136(1): 014502. https://doi.org/10.1115/1.4025883
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