Implantable head located radiofrequency coupled neurostimulation system for head pain

摘要

An implantable head-mounted, radiofrequency (RF) coupled, unibody peripheral neurostimulation system is provided for implantation in the head for the purpose of treating chronic head pain, including migraine. The system may include an implantable pulse generator (IPG) from which multiple stimulating leads may extend sufficient to allow for adequate stimulation over multiple regions of the head, preferably including the frontal, parietal and occipital regions. A lead may include an extended body, along which may be disposed a plurality of surface metal electrodes (SME), which may be subdivided into a plurality of electrode arrays. A plurality of internal metal wires may run a portion of its length and connect the IPG's internal circuit to the SME. The IPG may include an RF receiver coil and an application specific integrated circuit. The IPG may be capable of functional connection to an external RF unit for purposes that may include power, diagnostics, and programming.

主权项

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; anda 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; anda 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; andthe 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.