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Scanning electron microscopy for flow-diverting stent research: technical tips and tricks.

Christina Iosif1, Pierre Carles2, Gilles Trolliard2

  • 1CHU de Limoges, Service de Neuroradiologie Interventionnelle, F-87000 Limoges, France Université de Limoges, Équipe de Recherche Médicale Appliquée, F-87000 Limoges, France christina.iosif@gmail.com.

Microscopy (Oxford, England)
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Summary

Flow-diverting stents offer a novel approach for treating complex intracranial aneurysms. Scanning electron microscopy in pigs reveals crucial details about neointimal healing and stent performance.

Keywords:
chemical fixationcritical point dryingendothelializationflow-diverting stentostiumscanning electron microscopy

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Area of Science:

  • Biomedical Engineering
  • Vascular Surgery
  • Materials Science

Background:

  • Intracranial aneurysms pose significant treatment challenges, especially those with complex anatomy.
  • Flow-diverting (FD) stents are a recent innovation in aneurysm treatment, requiring further research due to their complex mechanisms.
  • Understanding the healing process and surface interactions of FD stents is critical for clinical application.

Purpose of the Study:

  • To investigate the surface healing characteristics of flow-diverting stents in an animal model.
  • To evaluate the efficacy of scanning electron microscopy in assessing neointimal healing at the aneurysm neck and covered side branches.
  • To present technical adaptations for scanning electron microscopy preparation protocols in stented animal models.

Main Methods:

  • A pilot study was conducted on Large White pigs.
  • Flow-diverting stents were implanted at the carotid bifurcations.
  • Scanning electron microscopy was employed to examine the surface morphology of the stented regions, focusing on neointimal healing and side branch ostia coverage.

Main Results:

  • Scanning electron microscopy provided detailed surface observations of neointimal healing at the aneurysm neck.
  • The technique allowed for visualization of covered side branch ostia, confirming stent apposition and endothelialization.
  • The study identified specific technical adaptations for scanning electron microscopy preparation protocols applicable to FD stent research.

Conclusions:

  • Scanning electron microscopy is a valuable tool for detailed surface analysis of flow-diverting stent healing in vivo.
  • The findings support the investigation of scientific hypotheses regarding FD stent performance and biological response.
  • Optimized preparation protocols enhance the utility of microscopy in preclinical research for vascular devices.