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The Ohio State University

1. Chen, Wei-Chuan. A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications.

Degree: PhD, Electrical and Computer Engineering, 2019, The Ohio State University

This dissertation presents a new technology for batteryless and wireless neurorecording system which can be applied clinically.Two clinical issues of this type of neural implant are the 1) multichannel operation and 2) high impedance and DC voltage offset from the brain electrode impedance.To resolve these two problems, one wireless multichannel system and one brain electrode interface impedance-matching system are proposed respectively.To achieve multichannel operation, one photo-activated multiplexer is employed in the implant circuit.The interrogator additionally sends an infrared control signal for channel selection.Experimental results show that the proposed neuropotential recorder exhibits 20 uVpp sensitivity at all eight channels.The system is also in compliance with the strictest Federal Communications Commission standards for patient safety.Notably, the proposed approach is scalable to a much higher number of channels.On the other hand, to mitigate the high impedance and DC voltage offset of the brain-electrode interface, one self-biasing PNP Bipolar Junction Transistor (BJT) is adopted in the brain circuits.This self-biasing PNP BJT increases the overall system's impedance and maintains the system sensitivity while the high impedance is present.Measurement results demonstrate that emulated neuropotentials as low as 200 uVpp can be detected at a 33 kOhms electrode impedance. Together, these proposed techniques would lead the wireless neuro recorders to be applicable in real, in-vivo clinical applications. Advisors/Committee Members: Volakis, John L. (Advisor), Kiourti, Asimina (Advisor).

Subjects/Keywords: Electromagnetics; Biomedical Engineering; Electrical Engineering; Biomedical telemetry, Electrodes, Impedance, Multiplexing, Neural implants, Radio frequency, Sensitivity, Wireless communication, Wireless sensor networks

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, W. (2019). A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1555661316375242

Chicago Manual of Style (16th Edition):

Chen, Wei-Chuan. “A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications.” 2019. Doctoral Dissertation, The Ohio State University. Accessed September 19, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555661316375242.

MLA Handbook (7th Edition):

Chen, Wei-Chuan. “A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications.” 2019. Web. 19 Sep 2019.

Vancouver:

Chen W. A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications. [Internet] [Doctoral dissertation]. The Ohio State University; 2019. [cited 2019 Sep 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1555661316375242.

Council of Science Editors:

Chen W. A Multi-Channel, Impedance-Matching, Wireless, Passive Recorder for Medical Applications. [Doctoral Dissertation]. The Ohio State University; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1555661316375242

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