Embedded Files
Design Goals
Design Goals
- Improvement in Chronic Heart Failure Diagnostics
- Ballistocardiogram (BCG) Acquisition
- Ease of Use
- Affordable
Device Design
Device Design
Our system incorporates a four-device beneath the bed monitor system to track the patient's heart rate, breathing rate, weight change, and ballistocardiogram.
How it works
How it works
Each device contains four load cells and one piezoelectric sensor. The load cells primarily provide tracking of static changes, such as weight change over time and breathing rate. The piezoelectric sensors balance out the weaknesses of the load cells by measuring dynamic signals, making the system better suited for acquiring higher frequency signals like the ballistocardiogram.
Circuit Design
Circuit Design
Due to the small voltage output of the piezoelectric sensor, a charge amplifier was integrated into the circuit to amplify the resulting signal. A band-pass filter was implemented as the second stage of the circuit to filter out external noise. With the ballistocardiogram hovering in the 1-20 Hz range, a Notch Filter of 50 Hz was chosen to attenuate higher frequency signals, primarily due to electronic interference and ground vibration.
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