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Spinal cord stimulation with interferential current

  • US 9,604,062 B2
  • Filed: 03/22/2016
  • Issued: 03/28/2017
  • Est. Priority Date: 01/22/2003
  • Status: Active Grant
First Claim
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1. A method for the treatment of chronic pain syndromes using electrical stimulation of the spinal cord, the method comprising:

  • positioning a first pair of implantable electrodes to a dura matter in an epidural space proximate to a subject'"'"'s spinal cord at predetermined locations;

    positioning a second pair of implantable electrodes to the dura matter in the epidural space proximate to the subject'"'"'s spinal cord at predetermined locations;

    positioning the first pair of implantable electrodes and the second pair of implantable electrodes so that a first circuit is created between a first electrode of the first pair of implantable electrodes and a first electrode of the second pair of implantable electrodes and so that a second circuit is created between a second electrode of the first pair of implantable electrodes and a second electrode of the second pair of implantable electrodes, wherein the first circuit and the second circuit are arranged to cross one another; and

    transmitting signals of first and second frequencies through the first and second pairs of implantable electrodes respectively, so that the signals of the first and second frequencies interfere with each other to produce at least one beat signal proximate to the subject'"'"'s spinal cord, and wherein a majority of the at least one beat signal is directionally distributed and controlled, enabling the at least one beat signal to avoid remaining in and shunting through cerebrospinal fluid proximate to the subject'"'"'s spinal cord, thereby recruiting dorsal column fibers,wherein the first circuit and the second circuit interfere to create a resultant signal having a resultant beat frequency that is a difference between the first and second frequencies and an amplitude that is additive and more than an amplitude of the signal of the first frequency, wherein the first and second circuits cross at about 90°

    resulting in a maximum amplitude of the resultant signal.

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