Testing Method and Design Guideline of Unit Cell Shape of Cellular Structures Made of AZ31 Magnesium Alloy Considering Application to Coronary Stent
Coronary stents are thin-walled cellular structures constructed by connecting unit cells in the circumferential and axial directions. The unit cell is subjected to in-plane bending during the expansion process in the diseased artery. As the simple test method to evaluate the in-plane bending and con...
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| Published in | Advanced Experimental Mechanics Vol. 9; p. 24-0007 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
The Japanese Society for Experimental Mechanics
2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2189-4752 2424-175X |
| DOI | 10.11395/aem.24-0007 |
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| Abstract | Coronary stents are thin-walled cellular structures constructed by connecting unit cells in the circumferential and axial directions. The unit cell is subjected to in-plane bending during the expansion process in the diseased artery. As the simple test method to evaluate the in-plane bending and contribute to the design of the stent unit cell shape, the rhombus-shaped specimen having the curved part and the straight part was suggested. The experimental and analytical investigations were performed on the rhombus specimen made of AZ31 magnesium alloy, and the influences of the design parameters on the strain gradient in the curved part and the deformability were investigated. The results proved that the rhombus-shaped specimen was useful to investigate the in-plane bending of the cellular structure. The in-plane strain gradient from tensile to compressive was found to occur in the curved part. Changing the design parameters of the rhombus specimen influences not only the deformability but also the tensile load, namely the force to keep the artery open. It should be emphasized that the addition of the appropriate length of a central straight part was found to be effective in improving the deformability of the cellular structure. |
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| AbstractList | Coronary stents are thin-walled cellular structures constructed by connecting unit cells in the circumferential and axial directions. The unit cell is subjected to in-plane bending during the expansion process in the diseased artery. As the simple test method to evaluate the in-plane bending and contribute to the design of the stent unit cell shape, the rhombus-shaped specimen having the curved part and the straight part was suggested. The experimental and analytical investigations were performed on the rhombus specimen made of AZ31 magnesium alloy, and the influences of the design parameters on the strain gradient in the curved part and the deformability were investigated. The results proved that the rhombus-shaped specimen was useful to investigate the in-plane bending of the cellular structure. The in-plane strain gradient from tensile to compressive was found to occur in the curved part. Changing the design parameters of the rhombus specimen influences not only the deformability but also the tensile load, namely the force to keep the artery open. It should be emphasized that the addition of the appropriate length of a central straight part was found to be effective in improving the deformability of the cellular structure. |
| Author | WADA, Akira KAGOTANI, Tomoya SHIMIZU, Ichiro TAKEMOTO, Yoshito UEDA, Shunpei |
| Author_xml | – sequence: 1 fullname: UEDA, Shunpei organization: Graduate School of Engineering, Okayama University of Science – sequence: 1 fullname: SHIMIZU, Ichiro organization: Department of Mechanical Engineering, Okayama University of Science – sequence: 1 fullname: WADA, Akira organization: Japan Medical Device Technology Co., Ltd – sequence: 1 fullname: TAKEMOTO, Yoshito organization: Faculty of Environmental, Life, Natural Science and Technology, Okayama University – sequence: 1 fullname: KAGOTANI, Tomoya organization: Graduate School of Engineering, Okayama University of Science |
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| References | 9) Tambaca, J., Canic, S., Kosor, M., Fish, R.D. and Paniagua, D.: Mechanical behavior of fully expanded commercially available endovascular coronary stents, Tex. Heart Inst. J., 38-5 (2011), 491-501. 2) Garg, S. and Serruys, P. W.: Coronary stents: Current status, J. Am. Coll. Cardiol., 56-10 (2010), S43-S78. 17) Shimizu, I., Wada, A., and Sasaki, M., “A Study on Designing Balloon Expandable Magnesium Alloy Stent for Optimization of Mechanical Characteristics”, Proceedings, 2 (2018), No. 52. 16) Iqbal, J., Onuma, Y., Ormiston, J., Abizaid, A., Waksman, R. and Serruys, P.: Bioresorbable scaffolds: rationale, current status, challenges, and future, Eur. Heart J., 35 (2014), 765-776. 4) Khan, W., Farah, S. and Domb, A. J.: Drug-eluting stents: Developments and current status, J. Control Release, 161 (2012), 703-712. 6) Petrini, L., Migliavacca, F., Auricchio, F. and Dubini, G.: Numerical investigation of the intravascular coronary stent flexibility, J. Biomech., 37 (2004), 495- 501. 12) e.g., ASTM F3067-14: Standard guide for radial loading of balloon-expandable and self-expanding vascular stents, ASTM International (2021). 11) Schiavone, A. and Zhao, L.: A computational study of stent performance by considering vessel anisotropy and residual stresses, Mater. Sci. Eng. C, 62 (2016), 307-316. 1) Garg, S. and Serruys, P. W.: Coronary stents: Current status, J. Am. Coll. Cardiol., 56-10 (2010), S1-S42. 18) Oh, S.I., Chen, C.C. and Kobayashi, S., Ductile Fracture in Axisymmetric Extrusion and Drawing - Part 2: Workability in Extrusion and Drawing, J. Manuf. Sci. Eng.,101 (1979), 36-44. 3) Ormiston, J. A., Webber, B. and Webster, M. W. I.: Stent longitudinal integrity, JACC Cardiovasc. Interv.,4-12 (2011), 1310-1317. 14) Ormiston, J. A. and Serruys, W. S.: Bioabsorbable coronary stents, Circ. Cardiovasc. Intervent., 2 (2009), 255-260. 7) Migliavacca, F., Petrini, L., Montanari, V. et al.: A predictive study of the mechanical behaviour of coronary stents by computer modelling, Med. Eng. Phys., 27 (2005), 13-18. 15) Kitabata, H., Waksman, R. and Warnack, B.: Bioresorbable metal scaffold for cardiovascular application: Current knowledge and future perspectives, Cardiovasc. Revasc. Med., 15 (2014), 109-116. 13) e.g., ISO 25539-2: Cardiovascular implants –Endovascular devices – Part 2: Vascular stents, International Organization for Standardization (2020). 5) Shimizu, I., Suzuki, T., Iwata, D. and Tada, N.: Development of test procedures and comparative mechanical property testing of balloon expandable stents, Adv. Exp. Mech., 1 (2016), 173-178. 8) Schmidt, W., Lanzer, P., Behrens, P. et al.: A comparison of the mechanical performance characteristics of seven drug-eluting stent systems, Catheter. Cardiovasc. Interv., 73 (2009), 350-360. 10) Grogan, J. A., Leen, S. B. and McHugh, P. E.: Comparing coronary stent material performance on a common geometric platform through simulated bench testing, J. Mech. Behav. Biomed. Mater., 12 (2012), 129-138. |
| References_xml | – reference: 18) Oh, S.I., Chen, C.C. and Kobayashi, S., Ductile Fracture in Axisymmetric Extrusion and Drawing - Part 2: Workability in Extrusion and Drawing, J. Manuf. Sci. Eng.,101 (1979), 36-44. – reference: 3) Ormiston, J. A., Webber, B. and Webster, M. W. I.: Stent longitudinal integrity, JACC Cardiovasc. Interv.,4-12 (2011), 1310-1317. – reference: 16) Iqbal, J., Onuma, Y., Ormiston, J., Abizaid, A., Waksman, R. and Serruys, P.: Bioresorbable scaffolds: rationale, current status, challenges, and future, Eur. Heart J., 35 (2014), 765-776. – reference: 2) Garg, S. and Serruys, P. W.: Coronary stents: Current status, J. Am. Coll. Cardiol., 56-10 (2010), S43-S78. – reference: 9) Tambaca, J., Canic, S., Kosor, M., Fish, R.D. and Paniagua, D.: Mechanical behavior of fully expanded commercially available endovascular coronary stents, Tex. Heart Inst. J., 38-5 (2011), 491-501. – reference: 8) Schmidt, W., Lanzer, P., Behrens, P. et al.: A comparison of the mechanical performance characteristics of seven drug-eluting stent systems, Catheter. Cardiovasc. Interv., 73 (2009), 350-360. – reference: 1) Garg, S. and Serruys, P. W.: Coronary stents: Current status, J. Am. Coll. Cardiol., 56-10 (2010), S1-S42. – reference: 14) Ormiston, J. A. and Serruys, W. S.: Bioabsorbable coronary stents, Circ. Cardiovasc. Intervent., 2 (2009), 255-260. – reference: 13) e.g., ISO 25539-2: Cardiovascular implants –Endovascular devices – Part 2: Vascular stents, International Organization for Standardization (2020). – reference: 4) Khan, W., Farah, S. and Domb, A. J.: Drug-eluting stents: Developments and current status, J. Control Release, 161 (2012), 703-712. – reference: 6) Petrini, L., Migliavacca, F., Auricchio, F. and Dubini, G.: Numerical investigation of the intravascular coronary stent flexibility, J. Biomech., 37 (2004), 495- 501. – reference: 15) Kitabata, H., Waksman, R. and Warnack, B.: Bioresorbable metal scaffold for cardiovascular application: Current knowledge and future perspectives, Cardiovasc. Revasc. Med., 15 (2014), 109-116. – reference: 17) Shimizu, I., Wada, A., and Sasaki, M., “A Study on Designing Balloon Expandable Magnesium Alloy Stent for Optimization of Mechanical Characteristics”, Proceedings, 2 (2018), No. 52. – reference: 10) Grogan, J. A., Leen, S. B. and McHugh, P. E.: Comparing coronary stent material performance on a common geometric platform through simulated bench testing, J. Mech. Behav. Biomed. Mater., 12 (2012), 129-138. – reference: 12) e.g., ASTM F3067-14: Standard guide for radial loading of balloon-expandable and self-expanding vascular stents, ASTM International (2021). – reference: 7) Migliavacca, F., Petrini, L., Montanari, V. et al.: A predictive study of the mechanical behaviour of coronary stents by computer modelling, Med. Eng. Phys., 27 (2005), 13-18. – reference: 5) Shimizu, I., Suzuki, T., Iwata, D. and Tada, N.: Development of test procedures and comparative mechanical property testing of balloon expandable stents, Adv. Exp. Mech., 1 (2016), 173-178. – reference: 11) Schiavone, A. and Zhao, L.: A computational study of stent performance by considering vessel anisotropy and residual stresses, Mater. Sci. Eng. C, 62 (2016), 307-316. |
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| SubjectTerms | Cellular structure Coronary stent Finite element method Magnesium alloy Unit cell design |
| Title | Testing Method and Design Guideline of Unit Cell Shape of Cellular Structures Made of AZ31 Magnesium Alloy Considering Application to Coronary Stent |
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