Batteryless Membrane Sensors and Electronics for Monitoring of Cardiovascular Signals
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Rigo, Bruno V.
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Abstract
This thesis explores using LC resonators, composed of a thin membrane capacitive sensor and an inductor, to monitor cardiovascular signals, such as pulse, seismocardiogram (SCG), and arterial strain. LC resonators are simple and easy-to-manufacture devices that can be monitored wirelessly without batteries. This technology allows for the creation of wearable and implantable devices usually used to monitor simple bioindicators. It was demonstrated that more complex signals, such as an SCG, can be collected this way. Moreover, the optimization of the design and fabrication process of a wireless stent connected to a capacitive strain sensor to detect early signs of restenosis was also performed. The device had a 3-times increase in sensitivity compared to previous literature. The capability to detect different restenosis levels was also confirmed in in-vitro tests. The fabrication process improvements, design optimization, and sensing improvements allow more complex wireless, battery-less devices to be created.
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2023-07-31
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Thesis