What Is a Thrombectomy?

A thrombectomy is a procedure to physically remove a blood clot from inside a blood vessel. Rather than waiting for medicine to dissolve the clot, the team goes in and takes it out — usually with a thin tube (a catheter) threaded through the vessels, sometimes through open surgery. It is most often an emergency treatment, used when a clot is blocking blood flow somewhere the body cannot afford to wait: a brain artery during a stroke, a lung artery in a major pulmonary embolism, or a deep leg vein.

The short video at the top of this page, "Removing Blood Clot From the Artery or Veins," runs about a minute and forty seconds and shows clot being removed from a vessel — the core of the procedure, without the hospital build-up around it. Here's how that moment fits into the full sequence, step by step.

Step 1: A scan finds the clot and maps the route

Everything starts with imaging. A CT or ultrasound scan shows where the clot is sitting, how big it is, and which vessels lead to it. That map decides the approach: which vessel the catheter will enter through, and whether a catheter procedure is suitable at all, or whether open surgery is the better route. In a stroke, this step happens against the clock — our stroke hub explains why minutes matter so much when brain tissue is starved of blood.

Step 2: Access — a small entry point, not a big incision

For the catheter version (often called mechanical or endovascular thrombectomy), the entry point is usually a puncture in a vessel in the groin or the wrist. The area is numbed, and many patients are awake or lightly sedated, though a general anaesthetic is sometimes used — particularly for stroke work, where keeping very still matters. Open surgical thrombectomy, by contrast, involves an incision over the vessel itself and is more common in some leg and arm arteries.

Step 3: The catheter travels to the clot under X-ray guidance

From the entry point, the catheter is steered through the vessel network while the team watches live X-ray images on screens — the angiography suite set-up of imaging arms and monitors that you'll recognise from the video above. A small injection of contrast dye outlines the vessels and confirms the catheter has reached the blockage. This is slow, precise work: the vessels on the way can be narrow, curved, or fragile.

Step 4: The clot is captured, broken up, or drawn out

This is the step the anchor video shows. Depending on the device and the clot's location, the clot may be drawn out with suction (aspiration), caught and pulled back with a small mesh retriever that opens inside the vessel, or worked on with a device that breaks it into pieces small enough to remove. Sometimes more than one pass is needed. Once the clot is out, dye is injected again — the moment the team looks for is contrast flowing past where the blockage was.

The same catheter idea is used in the brain during an acute stroke. The second video on this page, "Interventional Stroke" — about four minutes and forty seconds — walks through how intravenous and endovascular treatments are used to reopen blocked brain arteries and limit damage, and it pairs well with our guide to what happens in hospital during a stroke.

Step 5: Checks, closure, and medicines afterwards

With flow restored, the catheter comes out and the entry point is closed — often with firm pressure or a small closure device, and a period of lying flat if the groin was used. Imaging or scans may be repeated to confirm the vessel has stayed open. Afterwards, most people are prescribed blood-thinning or anti-clotting medicine for a period, because the conditions that allowed one clot to form can allow another. If the clot came from a deep vein, our article on deep vein thrombosis explains how those clots form and why they are treated seriously even when they cause few symptoms.

Where thrombectomy fits among clot treatments

Thrombectomy is one of three broad approaches, and teams often combine them. Blood-thinning medicines stop a clot growing and give the body time to clear it gradually; clot-dissolving medicines (thrombolysis) actively break a clot down but carry a higher bleeding risk; thrombectomy removes the clot mechanically, which is why it is favoured when a large, dangerous blockage needs opening quickly and a catheter can reach it. Not every clot needs — or suits — removal: small clots in stable patients are commonly managed with medicines alone, and the decision rests on the clot's location, the symptoms it is causing, and how the individual patient weighs up. The ordinary risks of a catheter procedure — bleeding at the entry site, damage to the vessel wall, contrast reactions, and the clot fragmenting and travelling further — are part of that conversation, as is the risk of doing nothing while tissue downstream is starved of blood.

References & further reading

MedlinePlus — Stroke (covers endovascular thrombectomy): https://medlineplus.gov/ency/article/000726.htm

MedlinePlus — Deep Vein Thrombosis: https://medlineplus.gov/deepveinthrombosis.html

MedlinePlus — Pulmonary embolus: https://medlineplus.gov/ency/article/000132.htm

National Heart, Lung, and Blood Institute — Venous Thromboembolism: https://www.nhlbi.nih.gov/health/venous-thromboembolism

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Frequently Asked Questions

Is a thrombectomy the same as thrombolysis?

No. Thrombolysis uses medicine to dissolve a clot; thrombectomy removes the clot physically, usually with a catheter. The two are sometimes combined — for example, clot-dissolving medicine given first, followed by catheter removal — and the choice depends on the clot's location, how urgent the situation is, and the bleeding risks for that patient.

Does a thrombectomy hurt?

The entry area is numbed with local anaesthetic, and many catheter thrombectomies are done with the patient awake or lightly sedated, so discomfort is usually limited to pressure at the puncture site. Stroke thrombectomy is sometimes done under general anaesthetic instead. Afterwards, soreness or bruising where the catheter went in is common for a few days.

How long does a thrombectomy take?

It varies a lot with the clot's location and how easily the catheter can reach it — the procedure can be under an hour or considerably longer, and preparation, imaging and recovery time come on top of that. In emergencies such as stroke, teams work to start as quickly as possible because outcomes depend heavily on how long tissue has been without blood flow.

Will I need medicine after a thrombectomy?

Usually, yes. Removing the clot reopens the vessel, but it doesn't remove the reason the clot formed, so blood-thinning or anti-clotting medicine is commonly prescribed afterwards for a period your team will set. Attend the follow-up scans and appointments — they check the vessel has stayed open and that no new clot is forming.

This article is for general education only and is not medical advice. It does not replace consultation with a qualified clinician. A sudden weakness, speech problem, chest pain or breathlessness is an emergency — call your local emergency number immediately rather than reading about procedures first.

Dr. Mohamed Ibrahim, MD, PhD

Physician-scientist · Founder, MedicalVideos.com

Dr. Ibrahim founded MedicalVideos.com in 2007 to make medical and surgical education freely accessible to students, clinicians, and patients.

Last reviewed: 11/07/26