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Related Experiment Videos

Greenfield filter fixation in large venae cavae

M A Savin1, R D Shlansky-Goldberg

  • 1Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104, USA.

Journal of Vascular and Interventional Radiology : JVIR
|February 19, 1998
PubMed
Summary

Newer Greenfield filters (TGF and SGF) show superior fixation in large inferior vena cavae (IVCs) compared to older versions. These filters may be safe for IVCs exceeding the traditional 28 mm diameter limit.

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Area of Science:

  • Vascular Surgery
  • Medical Device Engineering

Background:

  • The traditional Greenfield filter has a size limitation for placement in inferior vena cavae (IVCs) larger than 28 mm.
  • Newer Greenfield filter models feature larger base diameters, necessitating re-evaluation of their suitability for large IVCs.

Purpose of the Study:

  • To assess the fixation stability of three current Greenfield filter models within large-diameter inferior vena cavae.

Main Methods:

  • An ex vivo perfusion system utilized a 34-mm equine IVC.
  • Greenfield filters tested included the 24-F GF (30 mm base), percutaneous titanium TGF (38 mm base), and percutaneous stainless steel SGF (32 mm base).
  • Filters were deployed, and fixation was evaluated by measuring movement under increasing cephalic pull force.

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Main Results:

  • Both the TGF and SGF demonstrated significantly less movement than the 24-F GF in a 34-mm IVC (P < .001).
  • The TGF and SGF did not move above the renal veins with a 480-g pull, whereas three of seven 24-F GFs did at 30 g.
  • No significant difference in fixation was observed between the TGF and SGF (P = .6).

Conclusions:

  • The percutaneous titanium and stainless steel Greenfield filters offer superior fixation in large IVCs (34 mm diameter) compared to the original 24-F version.
  • These newer filter models may overcome the 28-mm IVC size restriction associated with older Greenfield filters.