Pacemaker failures characterized by continuous direct current leakage.

Area of Science:

• Biomedical Engineering
• Cardiology
• Medical Device Technology

Background:

• Pacemaker pulse generator failures can significantly impact patient care.
• Understanding failure mechanisms is crucial for improving device reliability.

Observation:

• Direct current leakage through output capacitors was identified as a cause of pulse generator failure.
• This defect was found in multiple implanted and external pulse generators.
• Leakage currents ranged from 0.14 to 0.26 milliamperes in implantable units.

Findings:

• The identified direct current leakage can lead to pacemaker implant failures.
• Myocardial damage and electrode deterioration were observed in some cases.
• Failures occurred unpredictably, sometimes within two weeks of normal function.

Implications:

• This capacitor-related failure mode can be mistaken for primary battery failure.
• Device monitoring programs may not predict these failures, necessitating a re-evaluation of diagnostic criteria.
• Understanding this failure mechanism is vital for enhancing pacemaker design and maintenance protocols.