IVC Filters are typically made from non-ferromagnetic materials, which makes them magnetic resonance imaging (MRI) compatible.

The filters fasten to the walls of the vena cava by way of hooks at the end of their struts (also called legs or arms). Human tissue grows around the hooks, which may assist in a secure attachment of the filter.

According to Medscape.com, some general characteristics filters have include the following:

  • The filter should trap most, if not all, thrombi so as to stop pulmonary emboli (PE)
  • The filter should keep caval patency as well as be non-thrombogenic (does not cause blood to form into a clot upon contact)
  • The integrity of the shape and structure of permanent filters should have long-term sustainability
  • The filter should be manufactured from biocompatible, noncorrosive substances
  • The filter’s implant design should provide for easy placement within the vena cava
  • The filter should not migrate, perforate, or tilt
  • The filter should be manufactured from non-ferromagnetic material so that magnetic resonance imaging (MRI) may be done following implantation
  • Many filters are marketed to be temporary and thus retrievable

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