The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We describe in this paper an energy-efficient waveform generator which is dedicated to build a low-power intra-cortical implantable microstimulator. It features novel flexible current-mode stimuli such as half-sine and rising exponential pulses. The output stage of the proposed device consists of an electrode-tissue driver that generates high-voltage supplies on-chip in order to increase the voltage...
A high-voltage electrode driver dedicated to intracortical microstimulation is presented. It is intended to significantly increase the voltage swing in order to maintain constant current stimulation through high-impedance electrode-tissue contacts. Charge pumps are used to generate high-voltage supplies of 8.615 V and -8.348 V from 3.3 V with low ripples (less than 1.6 %) while driving a maximal stimulation...
We present a multichip structure assembled with a medical-grade stainless-steel microelectrode array intended for neural recordings from multiple channels. The design features a mixed-signal integrated circuit (IC) that handles conditioning, digitization, and time-division multiplexing of neural signals, and a digital IC that provides control, bandwidth reduction, and data communications for telemetry...
This paper covers circuits and systems techniques for the construction of high reliability biosensing and microneurostimulation medical devices. Such implantable devices are dedicated for interconnections to intracortical neural tissues. Low-power high-reliability wireless links are used to power up such implanted devices while bidirectional data are exchanged between these microsystems and external...
We present the design of a multi-chip neural interface intended for multi-channel neural recording. The design features a mixed-signal part that handles neural signal conditioning, digitization and time-division multiplexing, and a digital part that provides control, bandwidth reduction, and serial communications towards a host interface. The two CMOS 0.18-mum fabricated embedded circuits that implement...
The electrode-tissues interface (ETI) is one of the key issues for the safety, reliability and efficiency of implantable devices such as stimulators and sensors. The aim of this paper is to report an implantable telemetry device, based on a full custom integrated circuit (IC) to monitor the ETI. The proposed system performs various types of measurements, such as impedance spectroscopy, cyclic voltammetry,...
This paper concerns the design and fabrication of new transducer movers dedicated to 3D ultrasound sensors. Our MEMS-based movers were designed using CoventorWare finite element software to maximize the sector and rotation scan angles. These movers are fabricated on silicon wafers using the standard PolyMUMPs process. The design includes both a scanner actuated using four trapezium electrodes and...
This paper concerns the design of a biotelemetry device dedicated to monitor the complex impedance of the electrode-tissues contacts (ETC) on long term implantations. It consists of an implantable wireless device performing the proposed measurement technique, and an external controller supporting the bi-directional communications between a PC and the implant. It uses a digital sine waveform approach...
This paper concerns the design of an integrated circuit (IC) dedicated to monitor electrode-tissues contact (ETC). It is the main module of an implantable telemetry device. This device allows one to apply various principles of electrochemical system's studies, such as cyclic voltammetry, electrochemical impedance spectroscopy, galvanostatic double pulse method, and thus, to measure the evolution of...
This keynote address covers methods employed to design highly reliable microsystems intended to build smart medical devices such as sensors and microstimulators. Advanced circuit techniques are used to make low-power low-voltage high reliability interfaces dedicated to wirelessly power up and bidirectional exchange various types of data with implantable devices. Special attention is paid to power...
The efficiency of implantable stimulation systems depends in large proportion of the electrode-tissue interface condition and in the choice of appropriate stimuli waveform. In this paper, we present an integrated flexible stimuli generator dedicated for high current stimulation in large electrode-tissue contact impedance. The system, powered by a single 3.3 V supply level, includes an integrated high...
In this paper, the development of a micro electromechanical scanner incorporating high frequency ultrasound transducer operating at 3.5 MHz is presented. We describe the structure and analysis of a microsystem that can be used as a scanner in based medical imaging system. The scanner consists of a rectangular platform attached to a frame actuated using four trapezium electrodes. The behavior of the...
We present the design and test of a portable wireless catheter system combining the simultaneous assessment of the transdiaphragmatic pressure and EMG of the diaphragm. The esophageal catheter includes two micro fabricated pressure sensors and five platinum ring electrodes. The low noise analog front-end features an electrode DC mismatch correction circuitry, a selectable gain (58 dB-97 dB) as well...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.