In Situ XRD Stress Analysis during Expansion of Stents

Wolfgang Kowalski; Markus Dammer; Frank Bakczewitz; Olaf Kessler

doi:10.4028/www.scientific.net/MSF.768-769.406

Paper Titles

Characteristic Evolution of Residual Stress in Shape Memory Fe-Mn-Si-Cr Alloys
p.374

Synchrotron Diffraction Study of the Cementite Phase in Cold Drawn Pearlitic Steel Wires
p.380

Residual Stress Development in Laser Machined PVD-Coated Carbide Cutting Tools
p.391

Prediction of the Distortions Caused by the Redistribution of the Residual Stresses During Machining Using FEM
p.398

In Situ XRD Stress Analysis during Expansion of Stents
p.406

Sensitivity of Macro- and Micro-Residual Stress States of Steel Surfaces to Thermal Influences Caused by Grinding Burn and Laser Treatments
p.412

Non-Destructive Residual Stress Analysis of Induction Hardened Components by Neutron and X-Ray Diffraction
p.420

Residual Stresses in the Hot Sprues of as-cast Mg-Zn Alloys Investigated by STRESS-SPEC Neutron Diffractometer
p.428

Through-Thickness Stresses in Automotive Sheet Metal after Plane Strain Channel Draw
p.433

HomeMaterials Science ForumMaterials Science Forum Vols. 768-769In Situ XRD Stress Analysis during Expansion of...

In Situ XRD Stress Analysis during Expansion of Stents

Abstract:

Stents are medical implants, which are applied to keep cavities in the human body open, e.g. blood vessels. Typically they consist of tube-like grids of suitable metal alloys. Typical dimensions depend on their applications: outer diameters in the mm-range and grid bar thickness in the 100 µm range. Before implantation, stents are compressed (crimped) to allow implantation in the human body. During implantation, stents are expanded, usually by balloon catheters. Crimping as well as expansion causes high strains and high stresses locally in the grid bars. These strains and stresses are important design criteria of stents. Usually, they are calculated numerically by Finite Element Analysis (FEA) [1,2]. The XRD-sin²ψ-technique is applied for in-situ-determination of stress conditions during crimping and expansion of stents of the CoCr-alloy L-605. This provides a realistic characterization of the near-surface stress state and an evaluation of the numerical FEA results. XRD-results show an increasing compressive load stress in circumferential direction with increasing stent expansion. These findings correlate with the numerical FEA results. Further residual stresses after removing the expansion device have been measured.

You might also be interested in these eBooks

International Conference on Residual Stresses 9 (ICRS 9)

View Preview

Info:

Periodical:

Materials Science Forum (Volumes 768-769)

Pages:

406-411

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.768-769.406

Citation:

Cite this paper

Online since:

September 2013

Authors:

Wolfgang Kowalski, Markus Dammer, Frank Bakczewitz, Olaf Kessler

Keywords:

CoCr-Alloy, Expansion, L-605, Load Stress, Residual Stress, Stent, X-Ray Diffraction (XRD)

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] D. Möller, W. Reimers, A. Pyzalla, A. Fischer, Residual Stresses in Coronary Artery Stents, J. Biomed. Mater. Res. 58 (2001) 69-74.

DOI: 10.1002/1097-4636(2001)58:1<69::aid-jbm100>3.0.co;2-9

Google Scholar

[2] H. Brauer, J. Stolpmann, H. Hallmann, R. Erbel, A. Fischer, Measurement and Numerical Simulation of the Dilatation Behavior of Coronary Stents, Materialwiss. Werkstofftech. 30 (1999) 876-885.

DOI: 10.1002/(sici)1521-4052(199912)30:12<876::aid-mawe876>3.0.co;2-o

Google Scholar

[3] J.F. Dyet, W.G. Watts, D.F. Ettles, A.A. Nicholson, Mechanical Properties of Metallic Stents: How Do These Properties Influence the Choice of Stent for Specific Lesions? Cardiovasc. Intervent. Radiol. 23 (2000) 47-54.

DOI: 10.1007/s002709910007

Google Scholar

[4] M. Bosiers, K. Deloose, R. Moreialvar, J. Verbist, P. Peeters, Current status of infrapopliteal artery stenting in patients with critical limb ischemia, J. Vasc. Bras. 7(3) (2008) 248-255.

DOI: 10.1590/s1677-54492008000300010

Google Scholar

[5] A.P.G. Newman-Sanders, W.G. Gedroyc, M.A. Al-Kutoubi, C. Koo, D. Taube, The Use of Expandable Metal Stents in Transplant Renal Artery Stenosis, Clinical Radiology 50 (1995) 245-250.

DOI: 10.1016/s0009-9260(05)83479-8

Google Scholar

[6] S. Fürderer, M. Anders, B. Schwindling, M. Salick, C. Düber, K. Wenda, R. Urban, M. Glück, P. Eysel, Vertebral body stenting, Der Orthopäde 31 (2002) 356-361.

DOI: 10.1007/s00132-001-0275-8

Google Scholar

[7] R. Rotter, H. Martin, S. Fuerderer, M. Gabl, C. Roeder, P. Heini, T. Mittlmeier, Vertebral body stenting: a new method for vertebral augmentation versus kyphoplasty, Eur. Spine J. 19 (2010) 916-923.

DOI: 10.1007/s00586-010-1341-x

Google Scholar