A wireless transmission system for visual prosthesis is introduced. Power and data are transmitted through inductive link between only one pair of coils, in order to reduce the size of the device. The transmitter is based on Class-E power amplifier due to its high efficiency, and a modulation circuit is added to control the dc supply of the Class-E amplifier to achieve ASK modulation of data with modulation depth of 25%. In addition, an experimental system is implemented, and test shows that it sufficiently supports a 16-channel micro-stimulator on power delivery and data transfer rate.
LIU Bo, WU Kai-Jie, WU Xiao-Bei, CHAI Xin-Yu.Design of Power and Data Telemetry System Utilizing Class-E Amplifier for Visual Prosthesis[J] Chinese Journal of Medical Instrumentation, 2011,V35(4): 239-242
P.E.K. Donaldson. "Engineering Visual Prostheses." Engineering in Medicine and Biology Magazine1983, 2 (2): 14 - 18.
M. Piedade, J[J].Gerald, L. A. Sousa, G. Tavares, P. Tomas. "Visual neuroprosthesis: A non invasive system for stimulating the cortex." IEEE Transactions on Circuits and Systems I-Regular Papers.2005,52(12):2648-2662
W. T. Liu, K[J].Vichienchom, M. Clements, S. C. DeMarco, C. Hughes, E. McGucken, M. S. Humayun, E. de Juan, J. D. Weiland, R. Greenberg. "A neuro-stimulus chip with telemetry unit for retinal prosthetic device." IEEE Journal of Solid-State Circuits.2000,35(10):1487-1497
G. X. Wang.[J].W. T. Liu, M. Sivaprakasam, M. C. Zhou, J. D. Weiland, M. S. Humayun, "A dual band wireless power and data telemetry for retinal prosthesis," presented at the 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, New York.2006,:-
胡长阳. D类和E类开关模式功率放大器: 北京，高等教育出版社. 1985
N. O. Sokal, "Class-E switching-mode high-efficiency tuned RF/microwave power amplifier: Improved design equations," presented at the 2000 IEEE Mtt-S International Microwave Symposium Digest, Boston, 2000.
孙青华, 郑艳萍, 张星. 数字通信原理: 北京，北京邮电大学出版社. 2007
MARIAN KAZIMIERCZK. "Collector amplitude modulation of the class E tuned power amplifier." IEEE Transactions on Circuits and Systems. 1984,31(6): 543 - 549.
N. D. Donaldson, T[J].A. Perkins. "Analysis of resonant coupled coils in the design of radio frequency transcutaneous links." Med Biol Eng Comput.1983,21(5):612-27
C. M. Zierhofer, E. S. Hochmair. "Geometric approach for coupling enhancement of magnetically coupled coils." IEEE Trans Biomed Eng.1996,43(7): 708-14.
P. R. Troyk, M[J].A. Schwan. "Closed-loop class E transcutaneous power and data link for microimplants." IEEE Trans Biomed Eng.1992,39(6):589-99
G. A. Kendir, W. T. Liu, G. X. Wang, M. Sivaprakasam, R. Bashirullah, M. S. Humayun, J. D. Weiland. "An optimal design methodology for inductive power link with class-E amplifier." IEEE Transactions on Circuits and Systems I-Regular Papers.2005, 52(5): 857-866.