Ultrasonically powered hydrogel-based wireless implantable glucose sensor

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 hydrogel-based glucose sensor requires a DC voltage of 200 mV. The output AC voltage of the receiver should be rectified before going to the sensor. A wireless inductive sensing technique is employed for the low power hydrogel-based implantable glucose sensor. The glucose test results show that the proposed system is capable of sensing the glucose changes within the physiological range.