IVC Filter Placement and Removal

1) What is an IVC filter?

An IVC filter is a small metal device placed inside the inferior vena cava, the large vein that carries blood from the legs back to the heart. The filter is designed to trap blood clots travelling from the legs or pelvis before they can reach the lungs and cause a pulmonary embolism (PE).

IVC filters do not treat existing clots. Their role is to reduce the risk of a clot reaching the lungs when anticoagulation (blood‑thinning medication) cannot be used or is not sufficient.

2) Why might an IVC filter be recommended?

An IVC filter may be considered when:

• There is a blood clot (DVT or PE) and anticoagulation is not possible or is unsafe
• Anticoagulation has failed or caused serious complications
• There is a temporary high risk of PE, such as around major surgery or trauma

Modern filters are usually retrievable, meaning they can be removed once the risk of PE has passed or anticoagulation can be safely used again.

3) IVC Filter Placement

What happens during placement

• The procedure is performed by an interventional radiologist
• Usually done under local anaesthetic, sometimes with sedation
• A small tube (catheter) is inserted into a vein in the neck or groin
• Using X‑ray guidance, the filter is positioned in the IVC and released

Key points

• It is typically a short day procedure with most patients going home the same day
• Anticoagulation may or may not be continued, depending on your situation

4) IVC Filter Removal

Many IVC filters are designed to be temporary.

When is removal considered?

• When anticoagulation can be safely started or restarted
• When the period of high PE risk has passed

What happens during removal

• Usually performed under local anaesthetic, sometimes with sedation
• A catheter is inserted (most commonly via the neck)
• The filter is captured and removed using specialised tools

Removal is generally straightforward, particularly when performed within the recommended timeframe. Sometimes it can be more complicated or not possible due to the position or type of filter.

5) Frequently Asked Questions

Will I feel the filter?
No. The filter sits inside the vein and is not felt.

How long will the filter stay in?
This depends on why it was placed. Some filters are removed within weeks to months; others may be left in place longer. Your referring doctor will review this regularly.

Do I still need blood thinners?
Possibly. An IVC filter does not replace anticoagulation in the long term. Your treating team will advise when and if blood thinners should be started or restarted.

What activity restrictions are there?
Light activity is usually fine the next day. Strenuous activity and heavy lifting are typically avoided for a few days after insertion or removal.

Will there be bruising?
Mild bruising or tenderness at the puncture site (neck or groin) is common and usually settles over a few days.

Who organises follow‑up and removal?
Your referring medical team will arrange follow‑up. If the filter is intended to be temporary, they will coordinate review and referral for removal when appropriate.

Are there risks?
IVC filter placement and removal are generally safe. Rare risks include bleeding, infection, filter movement, or difficulty with retrieval. These will be discussed with you before the procedure.

Prepared for patients of Dr James Hillhouse, Interventional Radiologist.

This information is general and should be discussed with your treating clinicians.