An implantable epileptic signal detector with wireless charging and wireless communication

• Published in: Diànzǐ jìshù yīngyòng Vol. 44; no. 7; pp. 76 - 80
• Main Authors: Qian Nixin, Zhu Yunfan, Shi Huan, Zhong Binbin, Wu Jinli, Wang Jie, Li Xiaolong
• Format: Journal Article
• Language: Chinese
• Published: National Computer System Engineering Research Institute of China 01.07.2018
• Subjects: chopper amplifier; epileptic detection algorithm; epileptic EEG signal; local field potential; radio frequency energy harvester; spikes
• ISSN: 0258-7998
• DOI: 10.16157/j.issn.0258-7998.173065

An epileptic signal detector with wireless charging and wireless communication is proposed in this work, which can be used to build a closed-loop neurostimulator. The detector consists of two recording electrodes, an epilepsy signal extraction and amplification module(including a chopper amplifier and two filters), a radio frequency energy harvester(RFEH), a blue-tooth module and an epileptic signal detection algorithm. The chopper amplifier is realized by a multistage in-phase amplifier with the ‘zero drift’ operational amplifier. The RFEH, which is the power supply of the system, is designed with a single channel Villard voltage doubler. The coastline parameters are employed to detect the seizure of the epilepsy. Measurement results show that the input voltage drift of the chopper amplifier is 1 μV. The gain of the local field potentials(LFP) and spikes are 40 dB and 100 dB. When the transmission power is 20 dBm@2.45 GHz, the distance between the transmitter and receiver is 2 cm，and with and without 1 kΩ lo