MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION WATCHMAN FLX? Pro; system, appendage closure, left atrial

Model Number	M635WU60310
Medical Device Problem Code	Failure to Seal (4070)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	09/02/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
Reported via patient call center it was reported the device did not seal.A left atrial appendage (laa) closure procedure was performed, and a 31mm watchman flx pro closure device was implanted on (b)(6)-2025.The patient was discharged.The patient called in to the watchman call center reporting that he has had two follow ups where transesophageal echocardiography (tee) has shown that the closure device did not fit perfectly creating a small leak.The patient reported the physician kept him on eliquis mediation to reduce the risk of a stroke.No further information was available or provided.
Additional Manufacturer Narrative
B3 date of event: aware date was used as event date as actual event date was not known.

• Brand Name: WATCHMAN FLX? Pro
• Common Device Name: system, appendage closure, left atrial
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 300 boston scientific way; marlborough MA 01752
• Manufacturer (Section G): Boston Scientific Corporation; ballybrit business park; galway H91 Y 868; EI H91 Y868
• Manufacturer Contact: mary crawford ; 4100 hamline ave n; arden hills, MN 55112 ; +1(651)440-0979
• MDR Report Key: 50736549
• Report Number: 2124215-2026-48763
• Device Sequence Number: 18785430
• Product Code: NGV
• UDI-Device Identifier: 00191506004613
• UDI-Public: (01)00191506004613(17)270520(10)34072915
• Combination Product (Y/N): N
• Initial Reporter State: AZ
• Initial Reporter Country: US
• PMA/510(K) Number: P130013
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2025
• Reporter Type: Manufacturer
• Report Source: Consumer
• Type of Report: Initial
• Report Date (Section B): 09/11/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: Yes
• Operator of Device: Health Professional
• Device Model Number: M635WU60310
• Device Catalogue Number: M635WU60310
• Device Lot Number: 0034072915
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 09/02/2026
• Initial Report FDA Received Date: 09/11/2026
• Date Device Manufactured: 05/20/2024
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Other
• Patient Age: 86 YR
• Patient Sex: Male