Next Article in Journal
Optimization of Micropump Performance Utilizing a Single Membrane with an Active Check Valve
Next Article in Special Issue
Design of a Compact Wireless Multi-Channel High Area-Efficient Stimulator with Arbitrary Channel Configuration
Previous Article in Journal
Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
Previous Article in Special Issue
Extending the Limits of Wireless Power Transfer to Miniaturized Implantable Electronic Devices
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessFeature PaperArticle
Micromachines 2017, 8(12), 368;

Optic Nerve Stimulation System with Adaptive Wireless Powering and Data Telemetry

Broadcom Corporation, Irvine, CA 92618, USA
State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao, China
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong, China
This paper is an extended version of our paper published in the 2014 IEEE International Symposium on Circuits and Systems (ISCAS) that was held in Melbourne VIC, Australia, 1–5 June 2014.
Author to whom correspondence should be addressed.
Received: 7 November 2017 / Revised: 4 December 2017 / Accepted: 6 December 2017 / Published: 20 December 2017
(This article belongs to the Special Issue Wireless Microdevices and Systems for Biomedical Applications)
Full-Text   |   PDF [15773 KB, uploaded 20 December 2017]   |  


To treat retinal degenerative diseases, a transcorneal electrical stimulation-based system is proposed, which consists of an eye implant and an external component. The eye implant is wirelessly powered and controlled by the external component to generate the required bi-polar current pattern for transcorneal stimulation with an amplitude range of 5 μA to 320 μA, a frequency range of 10 Hz to 160 Hz and a duty ratio range of 2.5% to 20%. Power delivery control includes power boosting in preparation for stimulation, and normal power regulation that adapts to both coupling and load variations. Only one pair of coils is used for both the power link and the bi-directional data link. Except for the secondary coil, the eye implant is fully integrated on chip and is fabricated using UMC (United Microelectronics Corporation, Hsinchu, Taiwan) 0.13 μm complementary metal-oxide-semiconductor (CMOS) process with a size of 1.5 mm × 1.5 mm. The secondary coil is fabricated on a printed circuit board (PCB) with a diameter of only 4.4 mm. After coating with biocompatible silicone, the whole implant has dimensions of 6 mm in diameter with a thickness of less than 1 mm. The whole device can be put onto the sclera and beneath the eye’s conjunctiva. System functionality and electrical performance are demonstrated with measurement results. View Full-Text
Keywords: wireless power transfer (WPT); data telemetry; implantable medical device (IMD); neural stimulation wireless power transfer (WPT); data telemetry; implantable medical device (IMD); neural stimulation

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Li, X.; Lu, Y.; Meng, X.; Tsui, C.-Y.; Ki, W.-H. Optic Nerve Stimulation System with Adaptive Wireless Powering and Data Telemetry. Micromachines 2017, 8, 368.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Micromachines EISSN 2072-666X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top