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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
Published on: September 18, 2015
Evaluation of carotid stent scaffolding through patient-specific finite element analysis
F Auricchio1, M Conti, M Ferraro
1Dipartimento di Ingegneria Civile ed Architettura, Università degli Studi di Pavia, Via Ferrata 1, 27100, Pavia, Italy.
Insights
Carotid artery stenting requires effective vessel scaffolding to prevent debris dislodgement. This study reveals that stent cell area changes post-implantation due to vessel tapering, impacting scaffolding effectiveness, especially in open-cell designs.
Area of Science:
- Biomedical Engineering
- Medical Device Design
- Cardiovascular Interventions
Background:
- Carotid artery stenting aims to contain plaque, raising concerns about stent scaffolding to prevent debris dislodgement.
- Current methods measure stent cell area in a free-expanded state, ignoring in-vivo deployment conditions.
Purpose of the Study:
- To investigate how different stent designs perform in terms of vessel scaffolding after deployment in a realistic carotid artery model.
- To analyze the impact of vessel tapering on stent cell area and scaffolding effectiveness.
Main Methods:
- Patient-specific finite element analysis was used to simulate the deployment of four distinct stent designs.
- Stent cell area was measured in a realistic carotid artery model, considering post-deployment configuration.
Main Results:
- Stent cell area changes significantly along the vessel length after deployment, influenced by vessel tapering.
- The reduction in cell area compared to the free-expanded state varies with stent design and vessel anatomy.
- Open-cell stent designs exhibit more pronounced post-implant variability, particularly at arterial bifurcations.
Conclusions:
- Free-expanded stent measurements offer a qualitative comparison but neglect crucial post-implant variability.
- Vessel tapering is a key factor influencing stent scaffolding effectiveness after carotid artery stenting.
- Computer-based simulations are valuable tools for assessing complex stent features like vessel scaffolding in realistic vascular environments.
Abstract:
After carotid artery stenting, the plaque remains contained between the stent and the vessel wall, moving consequently physicians' concerns toward the stent capability of limiting the plaque protrusion, that is, toward vessel scaffolding, to avoid that some debris is dislodged after the procedure. Vessel scaffolding is usually measured as the cell area of the stent in free-expanded configuration, neglecting thus the actual stent configuration within the vascular anatomy. In the present study, we measure the cell area of four different stent designs deployed in a realistic carotid artery model through patient-specific finite element analysis. The results suggest that after deployment, the cell area change along the stent length and the related reduction with respect to the free-expanded configuration are functions of the vessel tapering. Hence, the conclusions withdrawn from the free-expanded configuration appear to be qualitatively acceptable for comparative purposes, but they should be carefully handled because they neglect the post-implant variability, which seems to be more pronounced in open-cell designs, especially at the bifurcation segment. Even though the investigation is limited to few stent designs and one vascular anatomy, our study confirms the capability of dedicated computer-based simulations to provide useful information about complex stent features as vessel scaffolding.
