Reported Reactions

Devices › System, appendage closure, left atrial

Device brand name · System appendage closure left atrial

WATCHMAN FLX Pro LAA Closure Device with Delivery System: medical device reports filed with FDA

454 reports name it, 2023–2026. Manufacturer given most often on reports: Boston Scientific. Product code NGV.

454
device reports naming the brand
0% of all MAUDE reports · about 165 a year
57
reports, 12 months to August 2026
140 in the 12 months before
2.4%
classified as malfunction
10.9% across the product code
6.6%
classified as death, as reported
30 reports · not verified by FDA

FDA's MAUDE database holds 454 reports that name the brand "WATCHMAN FLX Pro LAA Closure Device with Delivery System" (system appendage closure left atrial), received between October 2023 and August 2026; the manufacturer given most often on reports is Boston Scientific. Spellings of one product vary from report to report.

57 reports arrived in the 12 months to August 2026, down 59% from 140 in the 12 months before. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases. The event types recorded are injury (91%), death (6.6%) and malfunction (2.4%); across all system, appendage closure, left atrial reports (product code NGV) death is recorded in 10.6% and malfunction in 10.9%. Event type is the reporter's classification of the report, not a verified outcome.

The device problems coded most often are migration (11.9%), difficult to open or close (8.8%) and device dislodged or dislocated (7.3%). The patient problems coded most often are thrombosis/thrombus, pericardial effusion and stroke/cva. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Reports by month, five years

03263Sep 2021: 0Oct 2021: 0Nov 2021: 0Dec 2021: 02022Jan 2022: 0Feb 2022: 0Mar 2022: 0Apr 2022: 0May 2022: 0Jun 2022: 0Jul 2022: 0Aug 2022: 0Sep 2022: 0Oct 2022: 0Nov 2022: 0Dec 2022: 02023Jan 2023: 0Feb 2023: 0Mar 2023: 0Apr 2023: 0May 2023: 0Jun 2023: 0Jul 2023: 0Aug 2023: 0Sep 2023: 0Oct 2023: 3Nov 2023: 5Dec 2023: 82024Jan 2024: 15Feb 2024: 12Mar 2024: 10Apr 2024: 24May 2024: 41Jun 2024: 63Jul 2024: 48Aug 2024: 28Sep 2024: 60Oct 2024: 40Nov 2024: 4Dec 2024: 62025Jan 2025: 2Feb 2025: 3Mar 2025: 4Apr 2025: 6May 2025: 6Jun 2025: 1Jul 2025: 3Aug 2025: 5Sep 2025: 4Oct 2025: 4Nov 2025: 3Dec 2025: 62026Jan 2026: 1Feb 2026: 1Mar 2026: 9Apr 2026: 5May 2026: 8Jun 2026: 9Jul 2026: 4Aug 2026: 3

Reports by the month FDA received them. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.

By year received

01763512023: 1620232024: 35120242025: 4720252026: 402026

Event type and report source

Event type, as classified on the report

Death6.6%30
Injury91%413
Malfunction2.4%11
Other0%0
Not given0%0

Who filed the report

Manufacturer report100%454
Voluntary report0%0
User facility report0%0
Distributor report0%0
Not given0%0

Grey bar: all 17,328 reports carrying product code NGV. Event type is the filer's classification and is not verified by FDA.

Device problems coded

Device problem (FDA code)ReportsShareShare across product code
Migrationthe device moved from where it was placed5411.9%4.4%
Difficult to open or close408.8%4.2%
Device dislodged or dislocated337.3%3.8%
Failure to seal184%2.5%
Detachment of device or device componentpart of the device came off122.6%1%
Material integrity problema problem with the device material51.1%1.6%
Material deformation40.9%2.7%
Difficult to removethe device was hard to remove20.4%2.8%
Air/gas in device10.2%0.2%
Deformation due to compressive stress10.2%0.1%
Difficult or delayed positioning10.2%0.1%

FDA's device problem codes as entered on the report; one report can carry several. Generic codes such as "no apparent adverse event" are left out.

Patient problems coded

Patient problem (FDA code)ReportsShare
Thrombosis/thrombus13529.7%
Pericardial effusionfluid around the heart10723.6%
Stroke/cva459.9%
Cardiac tamponade439.5%
Low blood pressure/ hypotension429.3%
Cardiac perforation275.9%
Chest painchest pain132.9%
Cardiac arrestthe heart stopped122.6%
Dyspneashortness of breath102.2%
Air embolism81.8%
Muscle weakness/atrophy81.8%
Pericarditisinflammation of the sac around the heart71.5%
Bradycardiaslow heart rate61.3%
Transient ischemic attack61.3%
Dizzinesslight-headedness or unsteadiness51.1%

Patient problem codes are present mainly in reports filed since 2019 and are often blank.

In context

MeasureWATCHMAN FLX Pro LAA Closure Device with Delivery SystemProduct code NGVAll MAUDE reports
Reports45417,32826,136,888
Share of that pool—2.6%0%
Classified as death, per 1,000 reports661069
Classified as injury91%78.5%36.2%
Classified as malfunction2.4%10.9%62.3%
Filed by the manufacturer100%99.1%94.9%

Shares are of reports, not of devices in use. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Other brands with product code NGV

BrandReportsLatest 12 monthsClassified as death
WATCHMAN LAA Closure Device & Delivery System4,042359.2%
WATCHMAN FLX Left Atrial Appendage Closure Device with Delivery System3,92313110.9%
Amplatzer Amulet2,54059112.3%
WATCHMAN FLX? Pro2,4161,38612%
WATCHMAN Access System2,081124.5%
Watchman Flx59319018%
Watchman Flx Laa Closure Device & Delivery System281014.6%
WATCHMAN TruSeal Access System716508%
WATCHMAN FXD Curve Access System9731989.6%
WATCHMAN TruSteer? Access System4012609.2%
Abbott26507.5%

Ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA also states that "common products may have a higher number of adverse events due to the higher total number of people using the product."

Questions about WATCHMAN FLX Pro LAA Closure Device with Delivery System reports

How many FDA reports name WATCHMAN FLX Pro LAA Closure Device with Delivery System?

454 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 57 in the latest 12 months.

What kinds of events are reported?

injury (91%), death (6.6%) and malfunction (2.4%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.

What device problems are coded?

migration (11.9%), difficult to open or close (8.8%), device dislodged or dislocated (7.3%), failure to seal (4%) and detachment of device or device component (2.6%). These are FDA's device problem codes as entered on the report.

Who files these reports?

manufacturer reports (100%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.

Do these reports show that WATCHMAN FLX Pro LAA Closure Device with Delivery System was at fault?

No. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA adds that "a causal relationship cannot be established between product and reactions listed in a report."

How do I report a problem with a medical device?

Through FDA MedWatch (Form FDA 3500 for health professionals and consumers), or to the manufacturer. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Device Adverse Event (MAUDE) bulk export released 28 Sep 2026, which holds reports FDA received through 31 Aug 2026. Brand, generic and manufacturer names are as written on the reports; product code names come from FDA's device classification. A report counts here when any device it lists carries this brand name after punctuation and capitalisation are normalised. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.