Stimulation signal generator for an implantable device
First Claim
1. A neurostimulation system for treating a disorder in a brain of a patient, comprising:
- a stimulation subsystem adapted to apply an electrical stimulation signal to neural tissue of the patient; and
a plurality of electrodes including a first electrode and a second electrode, each in electrical communication with the stimulation subsystem;
wherein the stimulation subsystem includes a stimulation signal generator adapted to deliver a controlled electrical current from a stimulation signal input through a stimulation load between the first electrode and the second electrode; and
wherein the stimulation signal generator includes a programmable current digital-to-analog converter in series with the stimulation load.
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Accused Products
Abstract
An implantable multimodal neurostimulator having improved efficacy in treating epilepsy and other neurological disorders and processes of using that neurostimulator are described herein. The neurostimulator itself generally has two modes of electrical stimulation. The first involves delivering a non-responsive electrical stimulation signal that is applied to the central nervous system to reduce the likelihood of a seizure or other undesirable neurological even from occurring. Various waveform morphologies are described for non-responsive stimulation signals. A second mode involves delivering a responsive electrical stimulation signal when epileptiform waveforms are impending or extant. The responsive electrical stimulation signal is intended to terminate epileptiform activity, e.g., to desynchronize abnormally synchronous brain electrical activity.
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Citations
56 Claims
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1. A neurostimulation system for treating a disorder in a brain of a patient, comprising:
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a stimulation subsystem adapted to apply an electrical stimulation signal to neural tissue of the patient; and
a plurality of electrodes including a first electrode and a second electrode, each in electrical communication with the stimulation subsystem;
wherein the stimulation subsystem includes a stimulation signal generator adapted to deliver a controlled electrical current from a stimulation signal input through a stimulation load between the first electrode and the second electrode; and
wherein the stimulation signal generator includes a programmable current digital-to-analog converter in series with the stimulation load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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24. A neurostimulation system for treating a disorder in a brain of a patient, comprising:
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a stimulation subsystem adapted to apply a therapeutic electrical stimulation signal to the brain of the patient; and
a plurality of electrodes including a first electrode and a second electrode, each in electrical communication with the stimulation subsystem;
wherein the stimulation subsystem includes a stimulation signal generator adapted to deliver a controlled electrical current through a stimulation load between the first electrode and the second electrode; and
wherein the stimulation signal generator includes a programmable H-bridge circuit adapted to control the direction of current flow between the first electrode and the second electrode.
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40. A method for treating a disorder in a brain of a patient, the method comprising the steps of:
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generating a stimulation voltage;
configuring a switching matrix to select a first electrode and a second electrode from a plurality of electrodes;
connecting the stimulation voltage source to the first electrode and a programmable digital-to-analog current sink to the second electrode, thereby delivering a stimulation signal to the brain of the patient; and
controlling the programmable digital-to-analog current sink with a stimulation waveform to regulate an electrical current present in the stimulation signal. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification