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The Optional VenaTech™ Convertible™ Vena Cava Filter: Experimental Study in Sheep

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CardioVascular and Interventional Radiology Aims and scope Submit manuscript

Abstract

Purpose

Retrieval of optional caval filters may be impaired by filter tilting, migration, fracture, or embedding in the IVC wall. The goal of this experimental study was to evaluate a new optional filter, convertible by unlocking and removing the filter head.

Methods

Forty-nine Pre-Alp sheep (average weight, 55 kg) were anesthetized. IVC was catheterized via the right femoral vein (n = 46) or via the internal jugular vein (n = 3) with a 12.9-F sheath. VenaTech™ Convertible™ IVC filters were inserted as either permanent filters (n = 14) or as filters to be converted. Conversion was immediately after deployment (n = 19) or delayed after 1, 3, or 6 months (n = 20). Filter delivery, deployment, and conversion with measurement of migration and tilting were evaluated by cavography. Incorporation of the filter’s stabilizers and arms in the IVC wall was assessed by gross anatomy.

Results

Delivery system insertion, filter release, and immediate conversion were successful in all cases. Delayed conversion was completed in all but one sheep, due to insufficient snare tension. Complimentary balloon-catheter inflation was required in 12 of 20 delayed conversions to achieve filter opening. In all 49 sheep, no thrombosis, migration, or significant tilting occurred. Within 4 weeks of conversion, the filter’s stabilizers and arms were incorporated into the IVC wall. Upon removal, the filter head was free of intimal growth.

Conclusions

The VenaTech™ Convertible™ optional IVC filter was successfully implanted in all sheep with no migration or tilting. Conversion at various dates by filter head removal was feasible in all but one case.

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Acknowledgments

Support for this work was provided by funds from B. Braun Medical, France.

Conflict of interest

Alain F. Le Blanche, Jean-Baptiste Ricco, Michel Bonneau, and Philippe Reynaud have a consulting agreement with B. Braun Medical.

Author information

Authors and Affiliations

  1. University of Picardie—Jules Verne, Amiens, France

    Alain F. Le Blanche

  2. Department of Diagnostic and Therapeutic Radiology, Vascular Imaging Unit—C.H.U. d’Amiens, Hôpital Nord, 1 Place Victor Pauchet, 80054, Amiens Cedex 01, France

    Alain F. Le Blanche

  3. University of Poitiers, Poitiers, France

    Jean-Baptiste Ricco

  4. Department of Vascular Surgery and Vascular Medicine, C.H.U. de Poitiers, Poitiers, France

    Jean-Baptiste Ricco

  5. Centre of Research in Interventional Imaging (CRII), Institut National de la Recherche Agronomique (I.N.R.A.) and Assistance Publique—Hôpitaux de Paris (APHP), Jouy-en-Josas, France

    Michel Bonneau

  6. Department of Respiratory Diseases, Hôpital Européen Georges Pompidou (HEGP) APHP, Paris, France

    Philippe Reynaud

Authors
  1. Alain F. Le Blanche
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  2. Jean-Baptiste Ricco
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  3. Michel Bonneau
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  4. Philippe Reynaud
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Correspondence to Alain F. Le Blanche.

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Le Blanche, A.F., Ricco, JB., Bonneau, M. et al. The Optional VenaTech™ Convertible™ Vena Cava Filter: Experimental Study in Sheep. Cardiovasc Intervent Radiol 35, 1181–1187 (2012). https://doi.org/10.1007/s00270-011-0273-0

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  • DOI: https://doi.org/10.1007/s00270-011-0273-0

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