Estimation and Comparison of Natural Frequency of Coronary Metallic Stents using Modal Analysis

Saravana Kumar Jaganathan; Aruna Priyadharshni Subramanian; Agnes Aruna John; Muthu Vignesh Vellayappan; Arunpandian Balaji; Eko Supriyanto; Bakiraj Gundumalai   and Ashok Kumar Jaganathan

doi:10.17485/ijst/2015/v8i12/58966

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Estimation and Comparison of Natural Frequency of Coronary Metallic Stents using Modal Analysis

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2015/v8i12/58966

Year: 2015, Volume: 8, Issue: 12, Pages: 1-7

Original Article

Estimation and Comparison of Natural Frequency of Coronary Metallic Stents using Modal Analysis

Saravana Kumar Jaganathan^1*, Aruna Priyadharshni Subramanian¹ , Agnes Aruna John¹ , Muthu Vignesh Vellayappan¹ , Arunpandian Balaji¹ , Eko Supriyanto¹, Bakiraj Gundumalai² and Ashok Kumar Jaganathan³

¹ IJN-UTM Cardiovascular Engineering Centre, Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia; [email protected]

²Research & Development Department, Bridgestone India Automotive, Mumbai, India

³Assistant Manager, Research and Development Wing, AVTEC Ltd, CK Birla Group, Hosur, India

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objective: A recent report states that more than 2,000,000 stents are used worldwide per year. Here, we examine the structural integrity and modal analysis was done to estimate the natural frequency. Methods: An S-linked stent was modelled using ANSYS workbench. For this study three commonly used stent materials namely stainless steel (316L), cobalt-chromium alloy (CoCrMo) and titanium alloy (Ti6 Al4 V) were chosen. The modal analysis was done to find the natural frequencies for each bio-metal chosen. The natural frequencies were significantly different (P<0.05) for the three metallic stents at each corresponding modes.
Result: From a comparative study it is evident that the natural frequency acquired depends on the property of the chosen materials. The young's modulus and density of titanium alloy is the least, followed by 316L and cobalt chromium alloy, which is also revealed in the natural frequency pattern acquired. The vibrating modes at each frequency showed pronounced changes in their shapes for every stent material. The natural frequencies do not with the resonate and with the natural frequency of the blood vessels.
Conclusion: The medical product designers for designing new stents with better structural integrity before stent insertion, substituting in vivo experiment that is difficult and unpractical, may use this work.

Keywords: Cardiovascular Stent, Coronary Artery Obstruction, Modal Shapes, Natural Frequency, Structural integrity