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Passively powered pH sensor for study of gastric disorders
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2019-05
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Piaquadio_Honors.pdf
Adobe PDF, 21.14 MB
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A fully passive wireless implantable pH sensor that is implantable in an animate silicone
stomach environment has been developed for the study of gastric disorders. The system
has applications in medical training and testing. It can be used for pH monitoring as well
as testing the efficiency of antacid medication. To achieve this, wireless power is sent from
a reading circuit, via a class E amplifier connected to an inductive coil. The implanted
circuit harvests the energy sent with a charge pump, and returns the measured pH via
Frequency Shift Keying (FSK) modulation. The electronic components were simulated using
Keysight Advanced Design System (ADS), prototyped on breadboards, amended, and finally
manufactured onto Printed Circuit Boards (PCBs). To make the stomach, an injection
molding process was employed using a sacrificial wax inner core and a 3D printed mold.
The completed stomach model features 5mm thick walls at life-size scale, and demonstrates
realistic digestive motion. The current implant design uses a traditional pH probe for proof
of concept, fits within the stomach at 2.5cm by 5cm, and is capable of returning readings
at a distance of up to 4 inches with an accuracy within 0.2pH. The reader coil can read pH
once every ten minutes for 43 hours on a single charge.
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