Journal ArticleDOI
A Chip for an Implantable Neural Stimulator
Gunnar Gudnason,Erik Bruun,Morten Kristian Haugland +2 more
- Vol. 22, Iss: 1, pp 81-89
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TLDR
In this paper, the authors describe a chip for a multichannel neural stimulator for functional electrical stimulation (FES), which is able to generate charge-balanced current pulses with a controllable length up to 256 μs and an amplitude up to 2 mA.Abstract:
This paper describes a chip for a multichannel neural stimulator for functional electrical stimulation (FES). The purpose of FES is to restore muscular control in disabled patients. The chip performs all the signal processing required in an implanted neural stimulator. The power and digital data transmission to the stimulator passes through a 5 MHz inductive link. From the signals transmitted to the stimulator, the chip is able to generate charge-balanced current pulses with a controllable length up to 256 μs and an amplitude up to 2 mA, for stimulation of nerve fibers. The quiescent current consumption of the chip is approx. 650 μA at supply voltages of 6–12 V, and its size is 3.9×3.5 mm^2. It has 4 output channels for use in a multipolar cuff electrode.read more
Citations
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Journal ArticleDOI
Fully integrated wideband high-current rectifiers for inductively powered devices
Maysam Ghovanloo,Khalil Najafi +1 more
TL;DR: In this paper, the design and implementation of fully integrated rectifiers in BiCMOS and standard CMOS technologies for rectifying an externally generated RF carrier signal in inductively powered wireless devices, such as biomedical implants, radio-frequency identification (RFID) tags, and smartcards to generate an on-chip dc supply.
Journal ArticleDOI
Wireless smart implants dedicated to multichannel monitoring and microstimulation
TL;DR: This invited paper covers several techniques and methods employed to build high reliability circuits and systems dedicated to implement advanced implantable and wirelessly controlled smart medical devices such as sensors and microstimulateurs.
Journal ArticleDOI
A fully integrated low-power BPSK demodulator for implantable medical devices
Yamu Hu,Mohamad Sawan +1 more
TL;DR: A fully integrated binary phase-shift keying (BPSK) demodulator, which is based on a hard-limited COSTAS loop topology, dedicated to such implantable medical devices, which may improve the controllability and observability of the overall implanted system.
Journal ArticleDOI
Energy Harvesting and Remote Powering for Implantable Biosensors
TL;DR: In this paper, a review of the most popular techniques to harvest energy for implantable biosensors is presented, focusing on the inductive links that are able to deliver power wirelessly through the biological tissues and enable bidirectional data communication with the implanted sensors.
Journal ArticleDOI
An Active Approach for Charge Balancing in Functional Electrical Stimulation
TL;DR: This paper presents a new active approach for charge balancing using long-term offset regulation, which is compared to a previously introduced active charge balancer as well as commonly used passive balancing techniques.
References
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Journal ArticleDOI
When are actively balanced biphasic ‘Lilly’ stimulating pulses necessary in a neurological prosthesis?
TL;DR: An experiment is described in which platinum electrodes were immersed in a saline paste containing pH indicator and stimulation pulses applied, and the observed electrode was first a direct- coupled cathode, and later made a directcoupled anode.
Journal ArticleDOI
CMOS transconductor VCO with adjustable operating and centre frequencies
B. Keeth,R.J. Baker,H.W. Li +2 more
TL;DR: In this article, a monolithic VCO using a transconductance architecture and with adjustable operating and center frequencies was presented, achieving oscillating frequencies from 50 MHz with external capacitors.
Proceedings ArticleDOI
Multichannel implantable stimulation and telemetry system for neuromuscular control
Zhengnian Tang,P.H. Peckham +1 more
TL;DR: An implantable stimulation and telemetry system is being developed to extend the capabilities of the authors' present implantable neuromuscular stimulators, by incorporating acquisition of command control and feedback signals from implanted transducers and additional channels of stimulation for enhancing motor functions.