Elastic recovery of polymeric braided stents under cyclic loading: Preliminary assessment.
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TL;DR: It comes out from the study that a braided polymer stent shows suitable mechanical behavior compared to a metallic stent over cyclic loading up to 2000 cycles, and it is shown that the mechanical behavior of these stents depend highly on the braid angle.
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Abstract: Over the last decades, stents have been largely used to treat vascular diseases such as coronary artery or peripheral vessel stenosis. Among the solutions which are commercially available to treat vascular stenosis, metallic stents represent the gold standard. However, issues such as restenosis, corrosion and fractures have been reported with these devices and are especially due to the material which is used. Braided polymeric stents could present an alternative to replace metallic stents especially in peripheral vessels where flexibility is required. Among polymeric materials, polyethylene terephthalate (PET), could be a good candidate as its biocompatibility has already been widely proven especially in the field of cardiovascular applications. Moreover, braided devices have been already used for the stenting of peripheral zones, providing locally outstanding flexibility due to the discontinuity of these structures. The goal of this work was to evaluate the radial strength and the recovery performances of polymeric braided stents made from PET monofilaments. In particular, the behavior of these stents under repeated cyclic radial compression loading was assessed and compared to results obtained with a metallic braided stent of same diameter. Results show that polymeric braided stents provide 100% elastic recovery after 20% diameter compression over 2000 repetitive loading cycles. However, radial strength goes slightly down with cycling, which points out that friction occurs in the braid. It comes out from the study that a braided polymer stent shows suitable mechanical behavior compared to a metallic stent over cyclic loading up to 2000 cycles. Moreover, it is shown that the mechanical behavior of these stents depend highly on the braid angle.
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Citations
3D Printing of Biodegradable Polymer Vascular Stents: A Review
Weijian Hua,Wei Jia Shi,Kellen Mitchell,Lily Raymond,Ryan Coulter,Danyang Zhao,Yifei Jin +6 more
- 01 Jun 2022
TL;DR: In this paper , the authors discuss 3D printing methods and their application in biodegradable polymer vascular stents (BPVSs) for percutaneous coronary interventions for the treatment of coronary artery diseases.
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Solvent-cast direct-writing as a fabrication strategy for radiopaque stents
Victor Chausse,Romain Schieber,Yago Raymond,Brian Ségry,Ramon Sabaté,Kumaran Kolandaivelu,Kumaran Kolandaivelu,Maria-Pau Ginebra,Marta Pegueroles +8 more
TL;DR: In this article, a solvent-cast direct-write (SC-DW) printing system was used to produce BRS onto a rotating cylinder with poly- l -lactic acid (PLLA) and poly( l-lactic-co- ǫ -caprolactone) (PLCL) inks.
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Poly( l -lactic acid) monofilaments for biodegradable braided self-expanding stent
TL;DR: In this paper, the PLLA monofilaments were prepared via melt spinning and solid-state drawing and the total draw ratios are from 2.8 to 30.8, which indicates that the braided PLLa stent can provide adequate support to the carotid lesion.
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Mixed-braided stent: An effective way to improve comprehensive mechanical properties of poly (L-lactic acid) self-expandable braided stent.
TL;DR: In this paper , a new preparation method for PLLA self-expandable braided stent by mixed-braided technology was proposed, and the radial strength and flexibility of different samples were evaluated respectively.
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Effects of constraint between filaments on the radial compression properties of poly (l-lactic acid) self-expandable braided stents
TL;DR: In this article, the radial compression properties of PLLA braided stents were investigated by considering two types of constraints between filaments in this paper, weak and strong constraints.
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Mechanical modeling of self-expandable stent fabricated using braiding technology.
TL;DR: It was concluded that the current mechanical model can appropriately predict the mechanical behavior of braided stents including such hysteretic behavior, and that the hysteresis was caused by the slippage between the constituent wires and their superelastic property.
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