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Related Experiment Videos

What can we learn from explanted endovascular devices?

G Riepe1, C Heintz, E Kaiser

  • 1Department of General, Vascular and Thoracic Surgery, General Hospital of Hamburg-Harburg, Eissendorfer Pferdeweg 52, D-21149 Hamburg, Germany.

European Journal of Vascular and Endovascular Surgery : the Official Journal of the European Society for Vascular Surgery
|October 23, 2002
PubMed
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Degradation of Stentor and Vanguard endovascular grafts was observed, with fabric holes, worn ligatures, and significant Nitinol stent corrosion. These findings question the long-term durability of these devices compared to conventional grafts.

Area of Science:

  • Biomaterials Science
  • Medical Device Engineering
  • Vascular Surgery

Background:

  • Endovascular grafts are crucial for treating vascular diseases.
  • Assessing the long-term durability of implanted devices is essential for patient safety and treatment efficacy.

Purpose of the Study:

  • To evaluate the in-vivo durability of Stentor and Vanguard endovascular devices.
  • To identify specific failure modes and material degradation in these vascular grafts.

Main Methods:

  • Analysis of 34 explanted Stentor (25) and Vanguard (9) endovascular grafts.
  • Mean implantation duration of 28.8 months.
  • Examination using stereomicroscopy and scanning electron microscopy.

Main Results:

Related Experiment Videos

  • Polyester textile covering exhibited gaps and holes.
  • Polypropylene ligatures showed wear and some ruptures.
  • Nitinol stent material displayed significant corrosion, including pits, craters, deficiencies, and fractures.

Conclusions:

  • Holes in polyester fabric and frame dislocations are characteristic of Stentor and Vanguard graft designs.
  • Early corrosion of Nitinol stent material is a notable concern.
  • Current conventional grafts remain the "gold standard" for long-term durability pending further data on newer devices.