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

Model Number	M635WU50310
Medical Device Problem Code	Adverse Event Without Identified Device or Use Problem (2993)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	07/21/2026
Type of Reportable Event	Death
Event or Problem Description
Reported via clinical study: it was reported that patient death occurred.A left atrial appendage closure (laac) procedure was performed, and a 31mm watchman flx laa closure device and delivery system (wds) was successfully implanted on (b)(6) 2022.The patient is reported to have passed away at home on (b)(6) 2026.A review of the obituary provided no additional information, and no official cause of death was provided.
Event or Problem Description
Reported via clinical study: it was reported that patient death occurred.A left atrial appendage closure (laac) procedure was performed and a 31mm watchman flx laa closure device and delivery system (wds) was successfully implanted on (b)(6) 2022.The patient is reported to have passed away at home on (b)(6) 2026.A review of the obituary provided no additional information and no official cause of death was provided.It was further reported that the physician has assessed the relationship of the death and the implant as not related.
Event or Problem Description
Reported via clinical study: it was reported that patient death occurred.A left atrial appendage closure (laac) procedure was performed and a 31mm watchman flx laa closure device and delivery system (wds) was successfully implanted on (b)(6) 2022.The patient is reported to have passed away at home on (b)(6) 2026.A review of the obituary provided no additional information and no official cause of death was provided.It was further reported that the physician has assessed the relationship of the death and the implant as not related.
Event or Problem Description
Reported via clinical study: it was reported that patient death occurred.A left atrial appendage closure (laac) procedure was performed and a 31mm watchman flx laa closure device and delivery system (wds) was successfully implanted on (b)(6) 2022.The patient is reported to have passed away at home on (b)(6) 2026.A review of the obituary provided no additional information and no official cause of death was provided.It was further reported that the physician has assessed the relationship of the death and the implant as not related.It was further reported that the patient experienced cardiac arrest due to worsening acute kidney failure.It was further reported that as per the sponsor, the causality of the study device watchman flx laa closure device has been downgraded to not related as per the conventions.The complaint has been withdrawn.
Additional Manufacturer Narrative
B5: describe event or problem - updated.
Additional Manufacturer Narrative
With all the available information, boston scientific (bsc) concludes: device technical analysis: the watchman flx? remains implanted; therefore, returned device analysis could not be completed.Device history record review: a review was completed of the device history records (dhr) for the watchman flx?, part # m635wu50310 batch # 0028768626.The dhr review confirmed that the device met all material, assembly, and performance specifications prior to distribution.Labeling review: there was no evidence to suggest that the device was used in a manner inconsistent with the labeling.Watchman flx? instructions for use (ifu) lists potential complications, risks and adverse events that may be associated with the use of this device which include death.Risk review: a risk review was completed and confirmed that the event of death was defined in the risk documentation.This event type has been accounted for during product risk analysis to support acceptable risk benefit for the product.Investigation conclusion: based on a thorough review of the reported complaint, boston scientific has assigned an investigation conclusion code of cause not established.
Additional Manufacturer Narrative
B5: describe event or problem - updated.H6: patient codes - updated.H6: impact codes - updated.

• Brand Name: WATCHMAN FLX
• 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: 50240105
• Report Number: 2124215-2026-43488
• Device Sequence Number: 10345017
• Product Code: NGV
• UDI-Device Identifier: 08714729860518
• UDI-Public: (01)08714729860518(17)250127(10)28768626
• Combination Product (Y/N): N
• Initial Reporter State: FL
• Initial Reporter Country: US
• PMA/510(K) Number: P130013
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2022
• Reporter Type: Manufacturer
• Report Source: Study,Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup,Followup,Followup
• Report Date (Section B): 10/02/2026

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?: No
• Operator of Device: Health Professional
• Device Expiration Date: 01/27/2025
• Device Model Number: M635WU50310
• Device Catalogue Number: M635WU50310
• Device Lot Number: 0028768626
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 08/07/2026
• Supplement Date Received by Manufacturer: Not provided; 09/18/2026; 09/29/2026
• Initial Report FDA Received Date: 08/13/2026
• Supplement Report FDA Received Date: 08/20/2026; 09/23/2026; 10/02/2026
• Date Device Manufactured: 01/28/2022
• 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: Death
• Patient Age: 71 YR
• Patient Sex: Male
• Patient Weight: 297 LB