Research Papers

Fabrication and Testing of Planar Stent Mesh Designs Using Carbon-Infiltrated Carbon Nanotubes

[+] Author and Article Information
Anton Bowden

Department of Mechanical Engineering,
Brigham Young University,
Provo, UT 84602

Manuscript received February 15, 2013; final manuscript received September 23, 2013; published online October 17, 2013. Assoc. Editor: Shaurya Prakash.

J. Nanotechnol. Eng. Med 4(2), 020903 (Oct 17, 2013) (7 pages) Paper No: NANO-13-1007; doi: 10.1115/1.4025598 History: Received February 15, 2013; Revised September 23, 2013

This paper explores and demonstrates the potential of using pyrolytic carbon as a material for coronary stents. Stents are commonly fabricated from metal, which has worse biocompatibilty than many polymers and ceramics. Pyrolytic carbon, a ceramic, is currently used in medical implant devices due to its preferable biocompatibility properties. Micropatterned pyrolytic carbon implants can be created by growing carbon nanotubes (CNTs), and then filling the space between with amorphous carbon via chemical vapor deposition (CVD). We prepared multiple samples of two different stent-like flexible mesh designs and smaller cubic structures out of carbon-infiltrated carbon nanotubes (CI-CNT). Tension loads were applied to expand the mesh samples and we recorded the forces at brittle failure. The cubic structures were used for separate compression tests. These data were then used in conjunction with a nonlinear finite element analysis (FEA) model of the stent geometry to determine Young's modulus and maximum fracture strain in tension and compression for each sample. Additionally, images were recorded of the mesh samples before, during, and at failure. These images were used to measure an overall percent elongation for each sample. The highest fracture strain observed was 1.4% and Young's modulus values confirmed that the material was similar to that used in previous carbon-infiltrated carbon nanotube work. The average percent elongation was 86% with a maximum of 145%. This exceeds a typical target of 66%. The material properties found from compression testing show less stiffness than the mesh samples; however, specimen evaluation reveals poorly infiltrated samples.

Copyright © 2013 by ASME
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Fig. 1

Sample mesh designs configured to undergo large deflections. On the left is the curved design, and the rectangular design is on the right.

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Fig. 2

CNT-M process with carbon infiltration

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Fig. 7

Typical force–deflection curve for the stent mesh tensile samples

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Fig. 8

Strain values as calculated from the ansys analyses. C stands for the curved design, while R stands for the rectangular design.

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Fig. 9

Modulus values as calculated from the ansys analyses. Labels are as in Fig. 8.

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Fig. 10

Percent elongation of each analyzed test cell. Labels are as in Fig. 8.

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Fig. 12

SEM image of broken transverse compression sample

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Fig. 13

SEM image of broken transverse compression sample with detail on infiltration quality, revealing multiple voids in the material

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Fig. 6

Camera view sample of images where measurements of deflection were taken

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Fig. 5

Planar mesh test setup with Instron and gripping fixtures

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Fig. 4

Sample mesh example after KOH release and rinse

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Fig. 3

Example of sample size comparison to a United States penny

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Fig. 11

Plot showing compression samples in both directions




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