Title :
A SU-8-Based Fully Integrated Biocompatible Inductively Powered Wireless Neurostimulator
Author :
Sung-Hoon Cho ; Ning Xue ; Cauller, L. ; Rosellini, W. ; Jeong-Bong Lee
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
A fully integrated minimally invasive compact polymer-based wireless neurostimulator was designed, fabricated, and characterized both in open air and in vivo. The neurostimulator (3.1 × 1.6 × 0.3 mm) consists of a planar spiral coil for wireless power supply through inductive coupling, two Schottky diodes for full-wave rectification, an application-specific integrated circuit neurostimulator circuit chip for stimulus spike signal generation, and two biphasic platinum-iridium (PtIr) stimulation electrodes. The device is fully integrated and completely embedded in biocompatible SU-8 packaging. For in vivo testing, the wireless neurostimulator was implanted subcutaneously in a rat hind limb. At the coupling power of 21 dBm (125 mW) at 394-MHz resonant frequency, stable and robust cortical responses during extended periods of wireless stimulation were recorded.
Keywords :
application specific integrated circuits; biomedical electronics; integrated circuit packaging; platinum compounds; signal generators; PtIr; SU-8 packaging; Schottky diodes; application-specific integrated circuit neurostimulator circuit chip; biphasic stimulation electrodes; cortical responses; frequency 394 MHz; full-wave rectification; fully integrated biocompatible inductive powered wireless neurostimulator; in vivo testing; inductive coupling; minimal invasive compact polymer; open air; planar spiral coil; power 125 mW; rat hind; stimulus spike signal generation; wireless power supply; Application specific integrated circuits; Coils; Electrodes; Gold; Receivers; Sockets; Wireless communication; Implantable; SU-8; inductive coupling; neurostimulator; wireless;
Journal_Title :
Microelectromechanical Systems, Journal of
DOI :
10.1109/JMEMS.2012.2221155
