Apparatus and methods for differential stimulation of nerve fibers
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United States of America Patent
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Issued Date -
Jun 10, 2004
app pub date -
Dec 10, 2002
filing date -
Dec 10, 2002
priority date (Note) -
Abandoned
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Abstract
An implantable helical electrode assembly configured to fit around a nerve for electrically triggering or measuring an action potential or for blocking conduction in nerve tissue. A multiconductor flexible cable connects the electrode to an implanted signal receiver, and the assembly may include multiple individual flexible ribbon electrodes each partially embedded in a portion of the peripheral surface of a helically formed dielectric support matrix. The helical electrode assembly has a helix of a selected pitch and with a selected number of helical turns so that the entire peripheral nerve or any portion of it extending radially inward from the surface forming an annulus can be electrically stimulated. The spiral configuration of the assembly is easy to install around a nerve bundle during surgical implantation, and the resiliency of the assembly minimizes the risk of damage to nerve tissue. The tissue-contacting surface of each electrode is roughened to increase the electrode surface area.
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