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Technical Briefs

3D Reconstruction and Manufacture of Real Abdominal Aortic Aneurysms: From CT Scan to Silicone Model

[+] Author and Article Information
B. J. Doyle, A. Callanan, P. Kelly

Centre for Applied Biomedical Engineering Research (CABER), and Materials and Surface Science Institute, University of Limerick, Limerick, Ireland

L. G. Morris

Galway Medical Technology Centre, Galway Mayo Institute of Technology, Galway, Ireland

D. A. Vorp

Department of Surgery, Department of Bioengineering, McGowan Institute for Regenerative Medicine, and Centre for Vascular Remodelling and Regeneration, University of Pittsburgh, Pittsburgh, PA

T. M. McGloughlin1

Centre for Applied Biomedical Engineering Research (CABER), and Materials and Surface Science Institute, University of Limerick, Limerick, Irelandtim.mcgloughlin@ul.ie

1

Corresponding author.

J Biomech Eng 130(3), 034501 (Apr 28, 2008) (5 pages) doi:10.1115/1.2907765 History: Received February 07, 2007; Revised September 11, 2007; Published April 28, 2008

Abdominal aortic aneurysm (AAA) can be defined as a permanent and irreversible dilation of the infrarenal aorta. AAAs are often considered to be an aorta with a diameter 1.5 times the normal infrarenal aorta diameter. This paper describes a technique to manufacture realistic silicone AAA models for use with experimental studies. This paper is concerned with the reconstruction and manufacturing process of patient-specific AAAs. 3D reconstruction from computed tomography scan data allows the AAA to be created. Mould sets are then designed for these AAA models utilizing computer aided design∕computer aided manufacture techniques and combined with the injection-moulding method. Silicone rubber forms the basis of the resulting AAA model. Assessment of wall thickness and overall percentage difference from the final silicone model to that of the computer-generated model was performed. In these realistic AAA models, wall thickness was found to vary by an average of 9.21%. The percentage difference in wall thickness recorded can be attributed to the contraction of the casting wax and the expansion of the silicone during model manufacture. This method may be used in conjunction with wall stress studies using the photoelastic method or in fluid dynamic studies using a laser-Doppler anemometry. In conclusion, these patient-specific rubber AAA models can be used in experimental investigations, but should be assessed for wall thickness variability once manufactured.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Segmentation and polyline generation of CT scan. (a) shows the full CT scan, while (b) is a close-up of the region of interest. For the design of moulds, the AAA was regarded to be the full volume of the lumen and intraluminal thrombus (ILT).

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Figure 2

Example mould designs of patient-specific AAAs. (a) is a mould design including iliac arteries and (b) without iliac arteries.

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Figure 3

Example machined mould piece of inner AAA model

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Figure 4

Example FEA von Mises wall stress distribution for Patient A showing a region of peak stress on the anterior wall. The corresponding mould piece and resulting silicone model of the same patient can be seen on the right of this figure.

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