Title :
A high-density electrode array for a cochlear prosthesis
Author :
Bhatti, P.T. ; Arcand, B.Y. ; Wang, J. ; Butala, N.V. ; Friedrich, C.R. ; Wise, K.D.
Author_Institution :
NSF Eng. Res. Center for Wireless Integrated Microysyst., Michigan Univ., Ann Arbor, MI, USA
Abstract :
This paper reports a high-density cochlear electrode array integrated with an articulated backing device. Fabricated on a silicon substrate, the device offers stimulating sites on a pitch of 250 /spl mu/m. The backing device is designed to facilitate a deeper cochlear insertion and position the sites closer to the targeted neural receptors. The device is the first step towards a high-density 128-site array integrated with closed-loop position-sensing and control. Monopolar and bipolar auditory thresholds in guinea pigs are 50 /spl mu/A and 300 /spl mu/A, respectively, with tissue compliance voltages at 500 /spl mu/A of /spl sim/1.0V. A 32-site four-channel active array designed as the forerunner of the 128-site array is also described.
Keywords :
biological tissues; biomedical electrodes; biosensors; ear; prosthetics; 1 V; 250 micron; 50 muA; 500 muA; articulated backing device; bipolar auditory thresholds; closed loop position sensing; cochlear prosthesis; four channel active array; guinea pigs; high density electrode array; neural receptors; silicon substrate; tissue compliance voltages; Biomembranes; Deafness; Ear; Electrodes; Frequency; Humans; Neurons; Prosthetics; Silicon; Substrates;
Conference_Titel :
TRANSDUCERS, Solid-State Sensors, Actuators and Microsystems, 12th International Conference on, 2003
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7731-1
DOI :
10.1109/SENSOR.2003.1217124
