Abstract: A method and device is described, which provides electrical stimulation to the brain of a person, where the device comprises an external portion and at least one implantable portion. The external portion provides the energy source for stimulation to the implantable portions. The implantable portions provide at least two conductive paths through the skull and use the skull's high impedance to generate a current loop with the focus of stimulation lying in the current path.

Abstract: A method is described, which provides electrical stimulation to a person, where the current flows from a subcranial electrode, through a target brain region, through a separate conductive path, and back to a subcutaneous electrode, and where the parameters of the electric current pulses are set to influence the resonant properties of the brain.

Abstract: A device which provides a measure of the compliance of a vessel wall based on a change in pressure, which causes the vessel to distend. The device comprises a coil and capacitor, forming a tank circuit. The coil is expandable and positioned along a portion of the vessel so that when the portion of the vessel expands or contracts, the coil will also expand or contract, changing the area in side the coil. This change in area alters the coil inductance, and therefore the resonant frequency of the tank circuit, which can be detected externally.

Abstract: A method and device is described, which provides electrical stimulation to the brain of a person, where the device comprises an external portion and at least one implantable portion. The external portion provides the energy source for stimulation to the implantable portions. The implantable portions provide at least two conductive paths through the skull and use the skull's high impedance to generate a current loop with the focus of stimulation lying in the current path.

Abstract: A method and device is described, which provides electrical stimulation to the brain of a person, where the device comprises an external portion and at least one implantable portion. The external portion provides the energy source for stimulation to the implantable portions. The implantable portions provide at least two conductive paths through the skull and use the skull's high impedance to generate a current loop with the focus of stimulation lying in the current path.

Abstract: A method and device is described, which provides electrical stimulation to the brain of a person, where the device comprises an external portion and at least one implantable portion. The external portion provides the energy source for stimulation to the implantable portions. The implantable portions provide at least two conductive paths through the skull and use the skull's high impedance to generate a current loop with the focus of stimulation lying in the current path.

Abstract: A device is described, which provides electrical stimulation to the brain of a person, where the device comprises one or more modules, each module comprising an implantable pulse generator (IPG) and a lead with at least one subcranial electrode, which extends into or near the surface of the brain. Each module's IPG comprises a battery and a subcutaneous electrode. Each module is inserted into a burr hole, and a seal fills the space to minimize electric current flow between the subcutaneous electrode and subcranial electrode.

Abstract: A device is described, which is fully implantable and records the EEG of a person, where the device comprises a subcranial probe containing one or more electrodes, and an extracranial portion, which includes at least one electrode. The subcranial probe proceeds through an opening in the skull. The intracranial portion comprises a seal, which prevents fluid ingress or egress between the subcranial portion and the extracranial portion. Due to the high electrical resistance of the skull, the seal effectively isolates the extracranial electrode from the intracranial electrodes, making the extracranial electrode an effective ground reference for EEG recording.