MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION FLEXTEND; IMPLANTABLE LEAD

Model Number	4086
Medical Device Problem Code	Under-Sensing (1661)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	03/12/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that the right atrial (ra) lead showed intermittent undersensing, and the patient reported a shock as shown on the programmer.The ra lead sensitivity was programmed to a fixed value of 0.75 millivolts.Technical services (ts) noted intermittent ra undersensing on rhythmiq events.As of this time, this ra lead remains in service.No adverse patient effects were reported.
Additional Manufacturer Narrative
This product was manufactured before the implementation of the udi regulation, so the complete udi is unavailable.Applicable us product data has been included in this report.

• Brand Name: FLEXTEND
• Common Device Name: IMPLANTABLE LEAD
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112
• Manufacturer (Section G): CPI - DEL CARIBE; guidant puerto rico b. v.; #12, rd. #698; dorado PR 00646
• Manufacturer Contact: timothy degroot ; 4100 hamline avenue north; saint paul, MN 55112 ; 6515826168
• MDR Report Key: 24753991
• Report Number: 2124215-2026-17850
• Device Sequence Number: 10215395
• Product Code: DTB
• UDI-Device Identifier: 00802526397721
• UDI-Public: (01)00802526397721(17)090411
• Combination Product (Y/N): Y
• Initial Reporter State: CA
• Initial Reporter Country: US
• PMA/510(K) Number: P960006
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2007
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial
• Report Date (Section B): 04/01/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Lay User/Patient
• Device Expiration Date: 04/11/2009
• Device Model Number: 4086
• Device Catalogue Number: 4086
• 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: 03/13/2026
• Initial Report FDA Received Date: 04/01/2026
• Date Device Manufactured: 04/11/2007
• 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
• Patient Sex: Male