What is a TrapEase inferior vena cava (IVC) filter?

Updated: Oct 31, 2020
  • Author: Gary P Siskin, MD; Chief Editor: Kyung J Cho, MD, FACR, FSIR  more...
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Answer

TrapEase filter

The TrapEase filter was approved by the FDA in the summer of 2000. The filter is laser cut from a single tube of nitinol material without welding. It has a symmetric, trapezoidal, double-basket design providing 2 levels of clot trapping, as well as self-centering characteristics. The 2 baskets are connected through 6 side struts, each with proximal and distal hooks to provide filter anchoring. The TrapEase filter is 65 mm in length before deployment and 50 mm in length when expanded maximally to a diameter of 35 mm. The design allows placement in IVCs with diameters ranging from 18 to 30 mm. [22] (See the following image.) If appropriate, the catheter can be removed endoscopically. [44]

TrapEase filter. TrapEase filter.

The unique symmetric design of the TrapEase filter allows placement from either the jugular or femoral approach by using the same 55-cm package. A separate 90-cm length package is suitable for the antecubital approach. The filter is deployed by a pusher through an 8F OD (6F ID) introducer set. Before the 90-cm kit was available, Davidson and Grassi reported 5 cases of successful antecubital placement, [45] and Stone et al reported successful placement on 39 patients via the subclavian veins. [46]

In 2001, Rousseau et al reported a 95% technical success rate from their clinical experience with the TrapEase filter in 65 patients at 12 centers in Europe and Canada; 3 filters were placed not at the intended site. [47] No filter migration, insertion site thrombosis, filter fracture, or IVC perforation was observed. At 6-months follow-up, no recurrent PE was identified. Two cases of filter thrombosis were reported. [47] Other authors reported similar results. Of 751 TrapEase filters placed, Kalva et al reported 2 cases (0.2%) of near-total caval occlusion and 15 cases (6.8%) of CT scan–confirmed PE in 219 patients. [48]


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