A study of the geometrical and mechanical properties of a self‐expanding metallic stent—theory and experiment

Jedwab, Michael; Clerc, Claude

doi:10.1002/jab.770040111

Cited by 103 publications

(57 citation statements)

References 6 publications

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“…The group of the self·expanding stents consisted of the Wallstent made of Mediloy, which is mainly a steel alloy, and the nitinol atents , 12-17 mm), which is equivalent to 0.004 to 2.01 Nlcm (32). Although the stent type, stent diameter, and method of testing have been different, these values are well in accordance with our test resul t of 0.39 N/cm for the radial resistive force of a Wallstent (fully expanded diameter, 8 mm).…”

Section: • Weightmentioning

confidence: 99%

Physical Properties of Endovascular Stents: An Experimental Comparison

Duda

Wiskirchen

Tepe

et al. 2000

Journal of Vascular and Interventional Radiology

191

116

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Section: • Weightmentioning

confidence: 99%

Physical Properties of Endovascular Stents: An Experimental Comparison

Duda

Wiskirchen

Tepe

et al. 2000

Journal of Vascular and Interventional Radiology

191

116

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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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“…Jedwab and Clerc [1] simplified a bare type stent as combination of open-coiled helical springs. Each wire of bare stent was regarded as a spring and the equations for open-coiled helical spring by Wahl [2] was employed for wire model (Fig.…”

Section: Methodology a Bare Typementioning

confidence: 99%

“…1). We use wire model of Jedwab and Clerc [1] for bare stents and wires for coated and covered stents. In this section, we rearranged the equations for open-coiled helical spring used in the study of Jedwab and Clerc [1].…”

Section: Methodology a Bare Typementioning

confidence: 99%

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Analytical models for predicting mechanical properties of self-expandable metal stents with cover membrane

Moon

Hong

Chun³

et al.

2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-Various mechanical characteristics of stents were analyzed and mathematical models were developed in order to predict expansive pressure of stents. Given the geometry and material properties of a stent, one can utilize these models to predict its expansive pressure properties. Then, these models were verified with the test results derived from some prototype and commercially available stents. The models allow for the characterization of mechanical properties of stents and may be instrumental in developing clinically efficacious stents. Keywords -Self-expandable metal stent, radial expansive pressure, analytic model I. INTRODUCTIONSuccessful stenting is crucial for maintaining the patency of the organs with luminal obstruction. Three types of stents are commonly used: bare stent (wire only), coated stent (polymer coating on wire), and covered stent (polymer membrane on its peripheral surface).The clinical applicability of these stents largely depends on thorough understanding of their mechanical properties, one of which is radial expansive pressure. In the present study, we propose the mathematical models by which one can predict radial expansive pressures of coated and covered stents. A load is applied to elongate a stent in longitudinal direction. The load acting on the stent modeled with combination of n wires can be expressed as a function of pitch angle as in the following equation: and β is pitch angle, I moment of inertia, I p polar moment of inertia, E Young's modulus, G shear modulus, and n number of wires of a stent. B. Coated typeA coated stent exerts two types of forces against radial compression: the spring restoring force (F wire ) exerted by metal wires and polymer knot force (F coat ) derived from the moments by the knots of polymer coating. The helical spring model [1] is employed to calculate wire spring force in this type of stent. The polymer knots are considered as torsional springs and the spring moments are calculated. Fig. 2 shows stent in initial state and compressed state in θ-z plane (cylindrical coordination). When stent is compressed in radial direction as shown in Fig. 2(D), the moment from compressed torsional springs at each knots are exerted on wires of stent. The moment by one knot (M knot ) is ) (where k knot is a torsional spring constant. The moment exerted on one wire becomeswhere KNOTS wire is the number of knots in the wire. Thus, polymer knot force of a stent (F coat ) can be expressed as ANALYTICAL MODELS FOR PREDICTING MECHANICAL PROPERTIES OF SELF-EXPANDABLE METAL STENTS WITH COVER MEMBRANE Abstract Subject Terms Report Classification unclassified Classification of this page unclassified Classification of Abstract unclassified Limitation of Abstract UUNumber of Pages 4

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A study of the geometrical and mechanical properties of a self‐expanding metallic stent—theory and experiment

Cited by 103 publications

References 6 publications

Physical Properties of Endovascular Stents: An Experimental Comparison

Physical Properties of Endovascular Stents: An Experimental Comparison

Spontaneous Common Bile Duct Perforation Treated with Placement of Metal Stent

Analytical models for predicting mechanical properties of self-expandable metal stents with cover membrane

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