DVT Mechanical Thrombectomy

A large deep vein thrombosis in the thigh and pelvis does not just cause a swollen, painful leg now. In up to a third of people it leaves lasting damage — chronic swelling, aching, and skin changes or ulcers known as post-thrombotic syndrome — because the clot scars the vein and wrecks its valves.

Mechanical thrombectomy tackles this by physically pulling the fresh clot out through a catheter, in a single session, rather than relying on blood thinners to slowly dissolve it over months. Clearing the vein early gives the valves the best chance of surviving intact.

It is not needed for every DVT — a clot confined to the calf, or a smaller thigh clot with mild symptoms, is treated with anticoagulation alone. Thrombectomy is considered when:

Through a small puncture behind the knee or in the neck, and under X-ray guidance, a catheter is passed into the clotted vein. A mechanical device grips and withdraws the thrombus, often in one pass. If the scan shows the left iliac vein is being pinched by an overlying artery — May-Thurner syndrome, a common hidden cause — a stent is placed to hold it open. The procedure takes one to two hours, usually under sedation, with an overnight stay.

The leg swelling typically improves within a day or two. You will need a blood thinner for at least three to six months, sometimes longer or indefinitely if a lasting clotting tendency is found; blood tests for an inherited or acquired thrombophilia are arranged when the DVT had no obvious trigger. A graduated compression stocking, worn during the day for up to two years, further lowers the risk of post-thrombotic syndrome. A follow-up ultrasound confirms the vein — and any stent — has stayed open.