What is a Watchman implant?

← Watchman procedure preparation: the short explanation

All 6 sections, including text and pictures · 12 pages

SECTION 1

The Watchman is a small device placed inside the left atrial appendage (LAA)—a pouch attached to the heart’s upper left chamber. In patients with atrial fibrillation, blood can pool in this pouch and form clots. These clots can travel to the brain and cause a stroke.

The implant seals off this pouch to reduce stroke risk in selected patients. It does not treat atrial fibrillation or restore a normal heart rhythm.

A Watchman device seated inside the left atrial appendage with its fabric face sealing the opening into the left atrium. — The Watchman seals the opening of the LAA, helping prevent clots from this pouch from entering the bloodstream and traveling to the brain. It reduces stroke risk; it does not eliminate all clot formation or all causes of stroke.

You will still need prescribed blood thinner or antiplatelet medicines while the implant heals. Follow-up imaging checks its position and seal before your doctor decides whether medicines can be changed.

Sources & further readingWatchman: The implant procedure Boston Scientific: Recovery and follow-up Watchman discharge instructions

Updated October 2026. Educational information; your own care plan may differ. Medical illustrations are simplified examples for teaching.