Intracortical probe arrays with silicon backbone and microelectrodes on thin polyimide wings enable long-term stable recordings in vivo .

Autor:	Kilias A; Biomicrotechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Bernstein Center Freiburg, University of Freiburg, Freiburg, Germany., Lee YT; Microsystem Materials Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Institute of NanoEngineering and Microsystems, National Tsing-Hua University, Hsinchu, Taiwan., Froriep UP; Biomicrotechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Bernstein Center Freiburg, University of Freiburg, Freiburg, Germany.; Department of Implant Systems, Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Hannover, Germany., Sielaff C; Department of Implant Systems, Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Hannover, Germany., Moser D; Microsystem Materials Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany., Holzhammer T; Microsystem Materials Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany., Egert U; Biomicrotechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Bernstein Center Freiburg, University of Freiburg, Freiburg, Germany.; Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, Freiburg, Germany., Fang W; Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu City, Taiwan., Paul O; Microsystem Materials Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, Freiburg, Germany., Ruther P; Microsystem Materials Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.; Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, Freiburg, Germany.
Jazyk:	angličtina
Zdroj:	Journal of neural engineering [J Neural Eng] 2021 Nov 30; Vol. 18 (6). Date of Electronic Publication: 2021 Nov 30.
DOI:	10.1088/1741-2552/ac39b7
Abstrakt:	Objective. Recording and stimulating neuronal activity across different brain regions requires interfacing at multiple sites using dedicated tools while tissue reactions at the recording sites often prevent their successful long-term application. This implies the technological challenge of developing complex probe geometries while keeping the overall footprint minimal, and of selecting materials compatible with neural tissue. While the potential of soft materials in reducing tissue response is uncontested, the implantation of these materials is often limited to reliably target neuronal structures across large brain volumes. Approach. We report on the development of a new multi-electrode array exploiting the advantages of soft and stiff materials by combining 7- µ m-thin polyimide wings carrying platinum electrodes with a silicon backbone enabling a safe probe implantation. The probe fabrication applies microsystems technologies in combination with a temporal wafer fixation method for rear side processing, i.e. grinding and deep reactive ion etching, of slender probe shanks and electrode wings. The wing-type neural probes are chronically implanted into the entorhinal-hippocampal formation in the mouse for in vivo recordings of freely behaving animals. Main results. Probes comprising the novel wing-type electrodes have been realized and characterized in view of their electrical performance and insertion capability. Chronic electrophysiological in vivo recordings of the entorhinal-hippocampal network in the mouse of up to 104 days demonstrated a stable yield of channels containing identifiable multi-unit and single-unit activity outperforming probes with electrodes residing on a Si backbone. Significance. The innovative fabrication process using a process compatible, temporary wafer bonding allowed to realize new Michigan-style probe arrays. The wing-type probe design enables a precise probe insertion into brain tissue and long-term stable recordings of unit activity due to the application of a stable backbone and 7- µ m-thin probe wings provoking locally a minimal tissue response and protruding from the glial scare of the backbone. (© 2021 IOP Publishing Ltd.)
Databáze:	MEDLINE
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