An in vitro phantom study on the role of the bird-beak configuration in endograft infolding in the aortic arch

Salvatore Pasta, Francesco Scardulla, Antonino Rinaudo, Giuseppe Maria Raffa, Giuseppe D'Ancona, Michele Pilato, Cesare Scardulla

Research output: Contribution to journalArticlepeer-review


Purpose: To assess endograft infolding for excessive bird-beak configurations in the aortic arch in relation to hemodynamic variables by quantifying device displacement and rotation of oversized stent-grafts deployed in a phantom model. Methods: A patient-specific, compliant, phantom pulsatile flow model was reconstructed from a patient who presented with collapse of a Gore TAG thoracic endoprosthesis. Device infolding was measured under different flow and pressure conditions for 3 protrusion extensions (13, 19, and 24 mm) of the bird-beak configuration resulting from 2 TAG endografts with oversizing of 11% and 45%, respectively. Results: The bird-beak configuration with the greatest protrusion extension exhibited the maximum TAG device displacement (1.66 mm), while the lowest protrusion extension configuration led to the minimum amount of both displacement and rotation parameters (0.25 mm and 0.6°, respectively). A positive relationship was found between the infolding parameters and the flow circulating in the aorta and left subclavian artery. Similarly, TAG device displacement was positively and significantly (p

Original languageEnglish
Pages (from-to)172-181
Number of pages10
JournalJournal of Endovascular Therapy
Issue number1
Publication statusPublished - Feb 1 2016


  • Bird-beak configuration
  • Displacement
  • Endograft
  • Flow model
  • Hemodynamics
  • In vitro experiment
  • Patient-specific model
  • Stent-graft collapse
  • Stent-graft infolding
  • Stent-graft oversizing
  • Thoracic endovascular aortic repair

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Radiology Nuclear Medicine and imaging


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