Patent ID: 8977363
Filing Date: 2015-03-10
Classification: A61N

Abstract:
1. An electrical stimulator for the treatment of intractable pain syndromes, comprising: an interferential current generator comprising a sine wave generator which generates an interferential alternating current output comprising first and second sinusoidal signals having different first and second frequencies with a base medium frequency of at least 500 Hz but no more than 20 KHz; and at least two pairs of implantable electrodes wherein each electrode has a first and a second end, wherein the first ends are connected to said interferential current generator and the second ends are configured to be implanted to a dura matter in an epidural space at predetermined locations proximate to a subject's spinal cord, wherein each pair of said at least two pairs of implantable electrodes transmits one of said first and second sinusoidal signals such that the first and second frequencies interfere with each other to produce at least one beat frequency signal proximate to the subject's spinal cord, and wherein a majority of the at least one beat frequency signal is directionally distributed and controlled, enabling the at least one beat frequency signal to avoid remaining in and shunting through cerebrospinal fluid proximate to the subject's spinal cord, thereby recruiting dorsal column fibers.