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Implantable head located radiofrequency coupled neurostimulation system for head pain

  • US 9,498,635 B2
  • Filed: 01/06/2016
  • Issued: 11/22/2016
  • Est. Priority Date: 10/16/2013
  • Status: Active Grant
First Claim
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1. A system for controlling power delivery from an external power transfer system (EPTS) to at least one implantable neurostimulation system (INS), said system comprising:

  • an EPTS disposed outside a body; and

    at least one INS disposed beneath a dermis layer of the body;

    the EPTS including;

    a transmit coil, or a group of transmit coils disposed in series, each transmit coil corresponding to a respective INS;

    a transmit coil driver circuit operable to drive the group of one or more transmit coils with a resonant current having a peak magnitude; and

    a back telemetry circuit operable to receive a message communicated by an INS;

    each of said at least one INS respectively including;

    a receive coil tuned to the resonant frequency of the corresponding transmit coil and operable to receive power transferred therefrom when in proximity thereto;

    a plurality of electrodes;

    an electrode driver circuit for driving the plurality of electrodes;

    a current regulator circuit having an input to which the received power is coupled, and operable to provide on an output thereof a regulated electrode current to the electrode driver circuit;

    a monitoring circuit operable to determine whether the received power is sufficient to achieve current regulation of the current regulator circuit; and

    a back telemetry circuit operable to communicate a message to the EPTS;

    wherein;

    each respective INS is operable to communicate a respective message requesting a change in power transfer from the EPTS based upon a determination from the respective currrent regulator circuit; and

    the EPTS is operable to adjust the transmit coil driver circuit to change the peak magnitude of the resonant current, based on respective messages received from one or more respective INS.

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