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Hybrid Cathode Lithium Battery Discharge Simulation for Implantable Cardioverter Defibrillators Using a Coupled

Mahsa Doosthosseini1, Hamed Ghods2, Mahdi Khajeh Talkhoncheh2

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|August 11, 2023
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Summary
This summary is machine-generated.

The continuous low-level current from implantable cardioverter defibrillators (ICDs) significantly impacts battery life more than high-energy shocks. This finding can improve ICD battery design and longevity for patients.

Keywords:
Electro-thermal battery modelImplantable device power sourceLi/SVO-CFx batteryMonte Carlo simulation

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Implantable cardioverter defibrillators (ICDs) are crucial for managing fatal arrhythmia disorders.
  • The longevity and reliability of ICDs are critically dependent on their lithium battery power sources.
  • Understanding battery performance under various operational loads is essential for device efficacy.

Purpose of the Study:

  • To investigate the impact of implantable cardioverter defibrillator (ICD) loads on lithium battery longevity.
  • To analyze the electro-thermal dynamics and performance of Li/SVO-CFx batteries under simulated ICD conditions.
  • To explore the influence of continuous housekeeping currents versus intermittent defibrillation shocks on battery terminal voltage and discharge.

Main Methods:

  • A coupled electro-thermal dynamic model was developed for simulating ICD battery performance.
  • Monte Carlo simulations were employed to assess model accuracy and applicability.
  • Model predictions were compared with real-time experimental data from existing literature.

Main Results:

  • Battery terminal voltage is predominantly affected by continuous low-level housekeeping currents (microamps).
  • Intermittent high-energy defibrillation currents (amperes) have a lesser impact on terminal voltage dynamics.
  • The study provides insights into the complex interplay of discharge currents and battery performance.

Conclusions:

  • Continuous low-level discharge currents are the primary factor influencing implantable lithium battery voltage in ICDs.
  • Results can inform improved ICD battery design, control strategies, and operational parameters.
  • Enhancing battery lifespan can reduce the frequency of invasive replacement surgeries for patients.