MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION FINELINE II STEROX; IMPLANTABLE LEAD

Model Number	4479
Medical Device Problem Codes	Failure to Read Input Signal (1581); Under-Sensing (1661)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	02/05/2026
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
If pertinent information is provided in the future, a supplemental report will be submitted.
Event or Problem Description
It was reported that this pacemaker system exhibited undersensing on the right atrial (ra) lead.Technical services (ts) was consulted and provided troubleshooting options, as well as recommended to verify the right atrial automatic threshold (raat) test accuracy.This product remains in service.No adverse patient effects were reported.

• Brand Name: FINELINE II STEROX
• Common Device Name: IMPLANTABLE LEAD
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112
• Manufacturer (Section G): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112 5798
• Manufacturer Contact: timothy degroot ; 4100 hamline avenue north; saint paul, MN 55112 ; 6515826168
• MDR Report Key: 24428726
• Report Number: 2124215-2026-10061
• Device Sequence Number: 10393227
• Product Code: DTB
• UDI-Device Identifier: 00802526061936
• UDI-Public: (01)00802526061936(17)111013
• Combination Product (Y/N): Y
• Initial Reporter State: MD
• Initial Reporter Country: US
• PMA/510(K) Number: P960004
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2011
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial
• Report Date (Section B): 02/24/2026

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: 10/13/2011
• Device Model Number: 4479
• Device Catalogue Number: 4479
• Device Lot Number: 457898
• 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: 02/06/2026
• Initial Report FDA Received Date: 02/24/2026
• Date Device Manufactured: 10/13/2009
• 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 Age: 82 YR
• Patient Sex: Female