Understanding IVC Filters (Greenfield Filters)
Learn when IVC filters are needed to prevent pulmonary embolism, how they work, and what to expect during placement and retrieval.
IVC (inferior vena cava) filters are small, cage-like devices placed in the body's largest vein to catch blood clots before they can travel to the lungs. For patients who can't take blood thinners, an IVC filter can be lifesaving.
Who Needs an IVC Filter?
IVC filters are typically recommended when:
How the Procedure Works
Retrievable vs. Permanent Filters
Retrievable Filters
Can be removed once you can safely take blood thinners. Should be retrieved when no longer needed to avoid long-term complications.
Recommended for most patients today
Permanent Filters
Designed to stay in place forever. Used when patients will never be able to take blood thinners.
Less common in modern practice
Important Note
If you have a retrievable filter, don't forget about it! Many patients never return for retrieval. Ask your doctor about the plan for your filter.
Life With an IVC Filter
- You won't feel the filter once it's in place
- No activity restrictions from the filter itself
- Safe for MRIs (most modern filters)
- Carry a card indicating you have a filter
Need an IVC Filter Consultation?
Our vascular specialists provide filter placement, retrieval, and follow-up care.