IEEE Trans Microw Theory Tech
Department of Electrical Engineering, University of California, Los Angeles, CA 90095 USA.
Published: May 2023
This paper presents a miniaturized implant with a diameter of only 14 mm, which houses a novel System on Chip (SoC) enabling two voltage level stimulation of up to 16 implants using a single Tx coil. Each implant can operate at a distance of 80 mm in the air through the inductive resonant link. The SoC consumes only 27 W static power and enables two channels with stimulation amplitudes of 1.8 V and 3.3 V and timing resolution of 100 s. The SoC is implemented in the standard 180 nm complementary metal oxide semiconductor (CMOS) technology and has an area of 0.75 mm × 1.6 mm. The SoC comprises an RF rectifier, low drop-out regulator (LDO), error detection block, clock data recovery, finite state machine (FSM), and output stage. Each implant has a PCB-defined passcode, which enables the individual addressability of the implants for synchronized therapies. The implantable device weighs only 80 mg and sizes 20.1 . Tolerance of up to 70° to angular misalignment was measured at a distance of 50 mm. The efficacy of bilateral stimulation was further verified by implanting two devices on two sides of a pig's neck and performing bilateral vagus nerve stimulation (VNS), while monitoring the heart rate.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11031205 | PMC |
http://dx.doi.org/10.1109/tmtt.2022.3233368 | DOI Listing |
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