IVC Filter Placement and Removal

A small device in the large belly vein that catches clots

What is it?

An IVC filter is a small metal device placed in the inferior vena cava, the large vein in the belly that carries blood from the legs back to the heart. Its job is to catch a blood clot traveling up from the legs or pelvis before it reaches the lungs.

An interventional radiologist places it through a small nick in the neck or groin vein, using live X-ray. Most filters used now are retrievable. Removal is a second, shorter procedure, usually through the neck, once the clot risk has passed. The filter does not dissolve a clot that is already in the leg, and it is not a substitute for blood thinners when those can be used safely.

Why do I need it?

A filter may be placed when a clot in the legs or lungs is a concern and blood thinners cannot be used, or have not been enough. Common reasons include:

• A new clot, and bleeding that makes blood thinners unsafe
• A clot that formed or traveled despite blood thinners
• A short period of very high clot risk, such as around major surgery or trauma
• Removal is planned when blood thinners can be used again, or the short-term risk has passed

How do I prepare?

• Medicines: Tell the team about blood thinners and all other medicines. Do not stop them unless you are told to. Some people stay on a thinner.
• Allergies: Report allergies to contrast dye, numbing medicine, nickel or other metals, latex, or adhesives.
• Eating and labs: If sedation is planned, you may be asked not to eat for several hours. They may check kidney function and clotting studies.
• For removal: Bring your filter card if you have one. Imaging may be done first to see if a clot is caught in the filter.
• Support: Arrange a ride home. You should not drive after sedation.

How is it placed?

• You lie on your back. Monitors track your vital signs. The team cleans and numbs the neck or groin. Sedation is commonly used.
• A thin catheter is passed into the IVC. Contrast shows the vein and the kidney veins. The filter is released below the kidney veins and opens against the vein wall.
• The catheter is removed. Staff hold pressure and apply a bandage. Placement often takes 30 to 60 minutes.
• Removal is usually through a neck vein. A snare catches the filter hook, a sheath covers the filter, and it is pulled out. Removal often takes 30 to 90 minutes.
• You are watched in recovery. Many people go home the same day. Ask for a card with the filter type and a retrieval plan.

Care instructions

• Keep the bandage on for about 24 hours. You may usually shower after that and pat the site dry. Do not soak in a bath or pool for a few days.
• Rest the day of the procedure. Avoid heavy lifting and strenuous activity for 24 to 48 hours, or as directed.
• A small bruise at the neck or groin is common. Take blood thinners only as prescribed. The filter does not replace them when they are safe to use.
• Keep the filter card. Ask when removal is planned. Filters left in longer can be harder to remove.
• Tell future providers you have a filter, including before MRI. Most filters are MRI-safe, but check the card.

What to watch out for

Call your care team promptly if you notice:

• Bleeding or a growing lump at the neck or groin site
• New or worsening leg swelling, pain, or redness
• Fever, or redness and drainage at the puncture site
• You cannot make the planned retrieval visit
• Chest pain, trouble breathing, coughing blood, fainting, or sudden leg weakness — seek emergency care