Optimization of the electrical properties of SiC-improved polyimide based thin-film electrode arrays for neuroprosthetics

2012 ◽  
Vol 57 (SI-1 Track-E) ◽  
Author(s):  
J. S. Ordonez ◽  
C. Boehler ◽  
M. Schuettler ◽  
T. Stieglitz
Keyword(s):  
Thin Film ◽  
Electrical Properties ◽  
Film Electrode ◽  
Electrode Arrays ◽  
Thin Film Electrode

BaTiO3 THIN FILM BY CSD FROM MOLECULAR-DESIGNED PRECURSOR SOLUTION

2012 ◽  
Vol 05 (02) ◽  
pp. 1260007 ◽  
Author(s):  
MASAOMI NAGASAKA ◽  
DAI IWASAKI ◽  
NAONORI SAKAMOTO ◽  
NAOKI WAKIYA ◽  
HISAO SUZUKI
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Properties ◽  
Molecular Design ◽  
Precursor Solution ◽  
Cost Effective ◽  
Partial Hydrolysis ◽  
Film Electrode ◽  
Thin Film Electrode ◽  
Hydrolysis Method

BaTiO3 (BT) thin films were deposited by the cost effective method of a chemical solution deposition (CSD). 0.3 M BT precursor solution was prepared by the partial hydrolysis method. Partially hydrolyzed Ti -alkoxide and Ba precursor solution was reacted to prepare the highly polymerized BT precursor solution. BT precursor solution was spin-coated on a Pt/Ti/SiO2/Si substrate with (100)-oriented LaNiO 3 (LNO) thin film electrode. In addition, effect of the pre-annealing at 600°C in O2 atmosphere was elucidated by measuring the electrical properties of the resulting BT thin films deposited by the different annealing process. As a result, molecular-design of the BT precursor and a LNO thin film electrode were effective to enhance the electrical properties of the resultant BT thin films, as well as 600°C pre-annealing.

Flexible thin film electrode arrays for minimally-invasive neurological monitoring

2009 ◽  
Author(s):  
Jiwan Kim ◽  
T.J. Richner ◽  
S. Thongpang ◽  
K.A. Sillay ◽  
D.B. Niemann ◽  
...  
Keyword(s):  
Thin Film ◽  
Minimally Invasive ◽  
Film Electrode ◽  
Electrode Arrays ◽  
Thin Film Electrode

A Fluid Actuator for Thin-Film Electrodes

2006 ◽  
Vol 1 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Benjamin Arcand ◽  
Sudeep Shyamsunder ◽  
Craig Friedrich
Keyword(s):  
Thin Film ◽  
Electrode Array ◽  
Minimal Amount ◽  
Film Electrode ◽  
Scala Tympani ◽  
Electrode Arrays ◽  
Thin Film Electrode ◽  
Elliptical Cross ◽  
Auditory Nerves

Background. Cochlear implants have become an accepted and successful treatment for profound sensorineural deafness in both children and adults. Essential to the effective and efficient localized stimulation of the auditory nerves, is the position of the implant electrode array stimulating sites within the scala tympani (ST). However, the small size, delicate internal structures and helical shape of the cochlear chambers complicate the matter of precise positioning of the implant electrode array. The design, fabrication process, and in vitro testing of a fluid actuator to steer a thin-film electrode array is presented. The application chosen to show feasibility is for a cochlear implant, however, the actuator might be used for cortical electrode arrays, for example. Method of Approach. The actuator functions by a change of internal fluid pressure within one or more flattened and curled polymer microtubes, expanding the highly elliptical cross section of each tube thereby stiffening it and causing a change in its curling radius. The straightening from an initially helical shape allows insertion of an attached electrode array into the basal end of the in vitro cochlea and as the insertion proceeds the pressure is decreased allowing the straightened electrode array to controllably return to its initial helical shape. The allowable envelope of the scala tympani of a guinea pig was determined from published data and the actuator was designed and fabricated accordingly. Results. Multiple actuators were fabricated and tested in vitro. The insertion tests helped to confirm the viability of using this type of actuation to facilitate the insertion of an electrode array into the ST. These tests were performed in a minimal amount of time and often on the first attempt. The actuator reached the furthest extent of the in vitro cavity and achieved a position adjacent to the modiolus. Conclusions. In vitro insertion tests show that the actuator can deliver a thin-film electrode array to a depth of more than one turn into the in vitro scala tympani within a few minutes under open-loop, manual control.

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