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This paper presents a hydrogel-based glucose sensor for future implantable applications employing an inductive sensing technique. The prototype system is based on an ultra-low power tunnel diode oscillator employing a 2 mm-diameter/10-turn sensing coil enclosed in a 3D-printed sealed sensor package. A 3 mm × 3 mm × 80 μm metallic sensing plate embedded in a 3 mm × 3 mm × 400 μm glucose-sensitive hydrogel...
This paper reports on the development of a wireless ultrasound (acoustic) powering technique for an implantable glucose sensor. The acoustic power transmission system consists of a pair of PZT transducers, and is capable of providing the power and voltage required by the glucose sensor. A piezoelectric receiver with a diameter of 12.7 mm, and a PZT transmitter operating at 800 kHz are employed. The...
This paper presents the feasibility study and investigation of an inductive sensing technique with respect to the swelling of hydrogel samples for implantable biochemical sensing applications. A prototype sensing system is implemented based on an ultra-low power tunnel diode oscillator employing a 3 mm-diameter, 10-turn sensing coil positioned at 100 μm away from a 5 mm × 5 mm metallic sensing plate...
In this paper, we present preliminary results showing the response of glucose-sensitive hydrogels, confined in micro-pressure sensors, to the changes in environmental glucose concentration. The glucose concentrations were incrementally varied between 20 and 0mM in 0.15M PBS solution at 7.4 pH and bovine serum at 7.4 pH at room temperature and response of the sensor was recorded. The micro sensors...
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