Physical Properties of Endovascular Stents: An Experimental Comparison

Duda, Stephan H.; Wiskirchen, Jakub; Tepe, Gunnar; Bitzer, Michael; Kaulich, Theodor W.; Stoeckel, Dieter; Claussen, Claus D.

doi:10.1016/s1051-0443(07)61620-0

Cited by 187 publications

(120 citation statements)

References 35 publications

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“…Therefore, the design and the material of the carotid stents take on considerable importance in achieving a good long-term clinical outcome. Requirements placed on the stent are reliable plaque coverage, accompanied by good wall adjustment through high flexibility and radial force [15,16]. The importance of these requirements on a carotid stent is highlighted by a study that shows that most neurological complications do not occur until the post-procedural phase [17].…”

mentioning

confidence: 99%

Experimental Investigation of Modern and Established Carotid Stents

Wissgott

Schmidt

Behrens

et al. 2013

Fortschr Röntgenstr

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Purpose: The design and material determine the mechanical properties of stents. In vitro parameters such as radial force, flexibility and wall adaptation of different stents were investigated in order to obtain evidence for clinical use. Materials and Methods: A total of 8 stents, including 2 hybrid stents with a combination of closed/open-cell design (Sinus Carotid RX, Cristallo Ideale), 3 closed-cell stents (Adapt, Carotid Wallstent, Xact Carotid) and 3 open-cell stents (Vivexx Carotid, Prot?g? Rx and Precise) with a diameter of 8?mm and a length of 40?mm, were investigated. The radial force, the bending stiffness of the stent system and of the stent, and the collapse pressure were measured. The wall adjustment of the stents was documented by fluoroscopy and assessed in a step and curve model. Results: The bending stiffness of the stent systems declined significantly in the expanded state, whereby the Xact Carotid stent showed the highest value (291.1 N/mm2) in contrast to 31.6?39.4 N/mm2 for the Sinus Carotid and Cristallo Ideale. The radial force on expansion of the stents to 7?mm was lowest for the Adapt (0.009 N/mm) and highest for the Precise (0.068 N/mm). The collapse pressure was highest for the Carotid Wallstent (0.48?bar), compared with the other stents (0.1???0.2?bar). The best wall adjustment in the curve model was shown by the Precise, the Sinus Carotid Rx and the Vivexx Carotid Stent. The diameter change from 5 to 7?mm was smoothly adapted by the Cristallo Ideale and the Carotid Wallstent. The Adapt showed poor vessel wall adaptation in both step and curved vessels. Conclusion: As a result of their design, the Sinus Carotid Rx and the Cristallo Ideale show the best wall adjustment, with comparable radial force and high flexibility, whereby the Cristallo Ideale has the advantage that it has a closed-cell design in the middle third of the stent. The other stents should be taken into consideration with their specifications in individual cases. Key Points: The investigation of carotid stents provides an objective comparison of mechanical properties. Conclusions about the respective optimum uses of stents can be drawn from this. The hybrid stents show a good balance of properties for wide applicability. Citation Format: ??Wissgott C, Schmidt W, Behrens P et?al. Experimental Investigation of Modern and Established Carotid Stents. Fortschr R?ntgenstr 2014; 186: 157???165

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confidence: 99%

Experimental Investigation of Modern and Established Carotid Stents

Wissgott

Schmidt

Behrens

et al. 2013

Fortschr Röntgenstr

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“…There have been many studies that have evaluated mechanical properties of a stent. (Duda et al, 2000) reported that the important properties of a stent include acceptable weight, stiffness in its radial direction, ease of insertion into the blood vessel, and radiation transmittance capability. They then proposed a method to evaluate stent and its performances.…”

Section: Methods To Select Stent Suitable For Clinical Manifestation Bmentioning

confidence: 99%

“…The stent stiffness in radial direction was measured by using the radial compression test machine designed by reference to the method proposed by (Duda et al, 2000). A stent is mounted on the polytetrafluoroethylene stage with slit and wrapped in a sheet.…”

Section: Radial Compression Test and Stent Stiffness In Radial Directionmentioning

confidence: 99%

Design and Evaluation of Self-Expanding Stents Suitable for Diverse Clinical Manifestation Based on Mechanical Engineering

Yoshino¹,

Sato²

2012

Mechanical Engineering

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“…3,[14][15][16][17][18][19] One of the most important factors is RF because it expands and maintains the lumen at the stricture segment of the bile duct after the SEMS are deployed. The force can be influenced by the wire diameter, cell size (which depends on how close the wire is woven), and the wire-knitting method (braided, specially braided, or laser cut …”

Section: Mechanical Properties Ofsemsmentioning

confidence: 99%

Spontaneous Common Bile Duct Perforation Treated with Placement of Metal Stent

Yang¹,

Moon²,

You³

et al. 2016

Korean J Pancreas Biliary Tract

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Biliary self-expandable metal stents (SEMS), a group of non-vascular stents, have been used in the palliative management of biliary obstruction around the world. However, there are still unmet needs in the clinical application of biliary SEMS. Comprehensive understanding of the SEMS is required to resolve the drawbacks and difficulties of metal stent development. The basic structure of SEMS, including the materials and knitting methods of metal wires, covering materials, and radiopaque markers, are discussed in this review. What we know about the physical and mechanical properties of the SEMS is very important. With an understanding of the basic knowledge of metal stents, hurdles such as stent occlusion, migration, and kinking can be overcome to develop more ideal SEMS.

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Physical Properties of Endovascular Stents: An Experimental Comparison

Cited by 187 publications

References 35 publications

Experimental Investigation of Modern and Established Carotid Stents

Experimental Investigation of Modern and Established Carotid Stents

Design and Evaluation of Self-Expanding Stents Suitable for Diverse Clinical Manifestation Based on Mechanical Engineering

Spontaneous Common Bile Duct Perforation Treated with Placement of Metal Stent

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