MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION DYNAGEN MINI ICD VR; IMPLANTABLE DEFIBRILLATOR

Model Number	D021
Medical Device Problem Code	High impedance (1291)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	01/16/2023
Type of Reportable Event	Serious Injury
Event or Problem Description
It was reported that this implantable cardioverter defibrillator (icd) exhibited high out of range pacing impedance measurements on the right ventricular channel.No changes have been performed as the patient has been scheduled for a therapy upgrade in the future.At this time, this device remains in service.No further adverse patient effects were reported.
Event or Problem Description
It was reported that this implantable cardioverter defibrillator (icd) exhibited high out of range pacing impedance measurements on the right ventricular channel.No changes have been performed as the patient has been scheduled for a therapy upgrade in the future.At this time, this device remains in service.No further adverse patient effects were reported.
Additional Manufacturer Narrative
This product has not been returned to boston scientific, and as a result, laboratory analysis could not be conducted.The associated investigation determined that this device exhibited intermittent impedance measurements with no conclusive evidence of a malfunction or inadequate lead-to-device connection; please refer to the complaint description for more information regarding the specific circumstances of this event.Investigation has determined that this type of event is likely the result of an intermittent high impedance condition associated with the device spring contact and lead terminal ring.A design enhancement was implemented in 2020 to stabilize the electrical connection between the spring contact and the lead terminal.
Event or Problem Description
It was reported that this implantable cardioverter defibrillator (icd) exhibited high out of range pacing impedance measurements on the right ventricular channel.No changes have been performed as the patient has been scheduled for a therapy upgrade in the future.At this time, this device remains in service.No further adverse patient effects were reported.This device was explanted and replaced.This device was returned to boston scientific for evaluation.
Additional Manufacturer Narrative
Additional information was added to the following fields.This product has not been returned to boston scientific, and as a result, laboratory analysis could not be conducted.The associated investigation determined that this device exhibited intermittent impedance measurements with no conclusive evidence of a malfunction or inadequate lead-to-device connection; please refer to the complaint description for more information regarding the specific circumstances of this event.Investigation has determined that this type of event is likely the result of an intermittent high impedance condition associated with the device spring contact and lead terminal ring.A design enhancement was implemented in 2020 to stabilize the electrical connection between the spring contact and the lead terminal.
Additional Manufacturer Narrative
The returned device was thoroughly inspected and analyzed upon receipt at our post market quality assurance laboratory.Pin gage testing, designed to verify proper port dimensions, was completed.Each port measured as expected.The device was then exposed to simulated heart load conditions, and the pacing, and sensing functions were tested.Impedance testing was completed and all measurements were within normal limits.The device operated appropriately with no interruptions in therapy output at the returned programmed settings.A series of electrical tests was also performed, and again, normal device function was observed.Analysis did not identify any device characteristics that would have caused or contributed to the reported clinical observations.The associated investigation also determined that this device exhibited intermittent impedance measurements with no conclusive evidence of a malfunction or inadequate lead-to-device connection.Additional information was added to the following fields: b1: adverse event/product problem b2: outcome attributed to adverse event b5: describe event or problem field d6b: explant date h1: type of reportable event h6: impact codes.
Event or Problem Description
It was reported that this implantable cardioverter defibrillator (icd) exhibited high out of range pacing impedance measurements on the right ventricular channel.No changes have been performed as the patient has been scheduled for a therapy upgrade in the future.At this time, this device remains in service.No further adverse patient effects were reported.This device was explanted and replaced.This device was returned to boston scientific for evaluation.

• Brand Name: DYNAGEN MINI ICD VR
• Common Device Name: IMPLANTABLE DEFIBRILLATOR
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112
• Manufacturer (Section G): BOSTON SCIENTIFIC CORPORATION; cashel road; clonmel ; EI
• Manufacturer Contact: timothy degroot ; 4100 hamline avenue north; saint paul, MN 55112 ; 6515826168
• MDR Report Key: 16891904
• Report Number: 2124215-2023-22440
• Device Sequence Number: 6140150
• Product Code: LWS
• UDI-Device Identifier: 00802526533884
• UDI-Public: 00802526533884
• Combination Product (Y/N): N
• Initial Reporter State: RI
• Initial Reporter Country: US
• PMA/510(K) Number: P960040/S306
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2019
• Device Explanted Year: 2023
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup,Followup,Followup
• Report Date (Section B): 07/18/2023

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: Lay User/Patient
• Device Expiration Date: 06/29/2019
• Device Model Number: D021
• Device Catalogue Number: D021
• Device Lot Number: 106671
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 04/17/2023
• Supplement Date Received by Manufacturer: 05/18/2023; 05/26/2023; 06/28/2023
• Initial Report FDA Received Date: 05/08/2023
• Supplement Report FDA Received Date: 06/05/2023; 06/15/2023; 07/18/2023
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 07/26/2017
• 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: Required Intervention; Hospitalization
• Patient Age: 58 YR
• Patient Sex: Female