This capstone project focused on building a closed-loop cardiac electrogram acquisition and pacing system. The device distinguishes between normal sinus rhythm and patterns requiring intervention, then adapts pacing frequency to restore a healthy rhythm.
Implantable Cardiac Electrogram and Pacemaker
Implantable electrogram acquisition and pacing system that detects arrhythmia patterns and drives corrective pacing.
Key Reminders
- Walk through the electrogram signal chain and how noise was handled.
- Explain the pacing control logic that returns the heart to sinus rhythm.
- Highlight the use of LTSpice and bench emulation to validate behavior.
Technologies
Links
Clinical Problem
Designed a device capable of distinguishing healthy sinus rhythm from dangerous rhythms that require pacing intervention. The system continuously senses an electrogram, evaluates rhythm state, and applies corrective pacing when needed.
System Architecture
The architecture includes an analog front end, rhythm classifier, and a pacing signal generator. Bench emulation used a multi-wave function generator and pulse modulation to simulate physiologic signals.
c code
Code example forthcoming
Pacing control state machine.
Analog Front End
Developed amplification and filtering stages to isolate the electrogram from noise while preserving clinically relevant features for rhythm classification.
Testing and Validation
Validated sensing, classification, and pacing behavior using simulated rhythms in LTSpice and on the bench.
Demo and Next Steps
Future work includes encapsulation, biocompatibility planning, and power optimization for implantable deployment.