An intrafascicular electrode for recording of action potentials in peripheral nerves |
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Authors: | Mark S Malagodi Dr Kenneth W Horch Andrew A Schoenberg |
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Institution: | (1) Present address: Helen Hayes Hospital, Rt. 9W, 10993 West Haverstraw, NY;(2) Present address: Division of Physical Medicine and Rehabilitation, University of Utah School of Medicine, 84132 Salt Lake City, UT;(3) Department of Bioengineering, University of Utah, 2480 MEB, 84112 Salt Lake City, UT |
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Abstract: | We are developing a new type of bipolar recording electrode intended for implantation within individual fascicles of mammalian
peripheral nerves. In the experiments reported here we used electrodes fabricated from 25 μm diameter Pt wire, 50 μm 90% Pt-10%
Ir wire and 7 μm carbon fibers. The electrodes were implanted in the sciatic nerves of rats and in the ulnar nerves of cats.
The signal-to-noise ratio of recorded activity induced by nonnoxious mechanical stimulation of the skin and joints was studied
as a function of the type of electrode material used, the amount of insulation removed from the recording zone, and the longitudinal
separation of the recording zones of bipolar electrode pairs. Both acute and short term (two day) chronic experiments were
performed.
The results indicate that a bipolar electrode made from Teflon™-insulated, 25 μm diameter, 90% Pt-10% Ir wire, having a 1–2 mm long recording zone, can be used for recording of peripheral
nerve activity when implanted with one wire inside the fascicle and the other lead level with the first lead, but outside
the fascicle. No insulating cuff needs to be placed around the nerve trunk. |
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Keywords: | Neuroprosthesis Peripheral nerve electrodes Sensory recording |
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