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In vitro evaluation of a new temporary venous filter: the Spring filter

Z Y Xian1, S Roy, J Hosaka

  • 1Institute for Surgical Research, National Hospital (University of Oslo), Norway.

Cardiovascular and Interventional Radiology
|September 1, 1995
PubMed
Summary
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The Spring filter (SF) effectively traps clots in simulated veins, with optimal performance at a 3.0r functional diameter. Further investigation is warranted for this temporary venous filter model.

Area of Science:

  • Vascular surgery
  • Medical device engineering
  • Thrombosis management

Background:

  • Inferior vena cava filters are crucial for preventing pulmonary embolism.
  • Temporary venous filters offer a solution for short-term risk reduction.
  • Evaluating new filter designs is essential for improving patient safety and efficacy.

Purpose of the Study:

  • To assess the in vitro functional efficacy of the novel Spring filter (SF), a variable-sized temporary venous filter.
  • To determine the impact of filter size, simulated vein diameter, and clot characteristics on filter performance.

Main Methods:

  • The Spring filter (SF) was tested in a flow phantom using simulated veins (12-16 mm diameter).
  • Clots of varying sizes were introduced, and filter performance was evaluated at functional diameters of 3.0r, 2.8r, 2.6r, and 2.4r.

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  • Clot retention, filter stability, and pressure changes were recorded to assess trapping ability.

    • Main Results:

    • The Spring filter (SF) demonstrated stable configuration without axial tilting during deployment.
    • 100% clot trapping was achieved irrespective of clot size and vein caliber when the functional diameter was 3.0r.
    • Reduced clot trapping efficacy was observed at smaller functional diameters (2.6r and 2.4r), particularly with medium-sized clots (p < 0.05).

    Conclusions:

    • The Spring filter (SF) shows promising results for temporary venous clot retention.
    • Functional diameter is a critical factor influencing the filter's trapping efficacy.
    • The current model of the Spring filter (SF) warrants further investigation in comparison to existing retrievable vena cava filters.